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Bug#49938: Failing assertion: inode or deadlock in fsp/fsp0fsp.c

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Bug#54678: InnoDB, TRUNCATE, ALTER, I_S SELECT, crash or deadlock

- Incompatible change: truncate no longer resorts to a row by
row delete if the storage engine does not support the truncate
method. Consequently, the count of affected rows does not, in
any case, reflect the actual number of rows.

- Incompatible change: it is no longer possible to truncate a
table that participates as a parent in a foreign key constraint,
unless it is a self-referencing constraint (both parent and child
are in the same table). To work around this incompatible change
and still be able to truncate such tables, disable foreign checks
with SET foreign_key_checks=0 before truncate. Alternatively, if
foreign key checks are necessary, please use a DELETE statement
without a WHERE condition.

Problem description:

The problem was that for storage engines that do not support
truncate table via a external drop and recreate, such as InnoDB
which implements truncate via a internal drop and recreate, the
delete_all_rows method could be invoked with a shared metadata
lock, causing problems if the engine needed exclusive access
to some internal metadata. This problem originated with the
fact that there is no truncate specific handler method, which
ended up leading to a abuse of the delete_all_rows method that
is primarily used for delete operations without a condition.

Solution:

The solution is to introduce a truncate handler method that is
invoked when the engine does not support truncation via a table
drop and recreate. This method is invoked under a exclusive
metadata lock, so that there is only a single instance of the
table when the method is invoked.

Also, the method is not invoked and a error is thrown if
the table is a parent in a non-self-referencing foreign key
relationship. This was necessary to avoid inconsistency as
some integrity checks are bypassed. This is inline with the
fact that truncate is primarily a DDL operation that was
designed to quickly remove all data from a table.

mysql-test/suite/innodb/t/innodb-truncate.test:
  Add test cases for truncate and foreign key checks.
  Also test that InnoDB resets auto-increment on truncate.
mysql-test/suite/innodb/t/innodb.test:
  FK is not necessary, test is related to auto-increment.
  
  Update error number, truncate is no longer invoked if
  table is parent in a FK relationship.
mysql-test/suite/innodb/t/innodb_mysql.test:
  Update error number, truncate is no longer invoked if
  table is parent in a FK relationship.
  
  Use delete instead of truncate, test is used to check
  the interaction of FKs, triggers and delete.
mysql-test/suite/parts/inc/partition_check.inc:
  Fix typo.
mysql-test/suite/sys_vars/t/foreign_key_checks_func.test:
  Update error number, truncate is no longer invoked if
  table is parent in a FK relationship.
mysql-test/t/mdl_sync.test:
  Modify test case to reflect and ensure that truncate takes
  a exclusive metadata lock.
mysql-test/t/trigger-trans.test:
  Update error number, truncate is no longer invoked if
  table is parent in a FK relationship.
sql/ha_partition.cc:
  Reorganize the various truncate methods. delete_all_rows is now
  passed directly to the underlying engines, so as truncate. The
  code responsible for truncating individual partitions is moved
  to ha_partition::truncate_partition, which is invoked when a
  ALTER TABLE t1 TRUNCATE PARTITION p statement is executed.
  
  Since the partition truncate no longer can be invoked via
  delete, the bitmap operations are not necessary anymore. The
  explicit reset of the auto-increment value is also removed
  as the underlying engines are now responsible for reseting
  the value.
sql/handler.cc:
  Wire up the handler truncate method.
sql/handler.h:
  Introduce and document the truncate handler method. It assumes
  certain use cases of delete_all_rows.
  
  Add method to retrieve the list of foreign keys referencing a
  table. Method is used to avoid truncating tables that are
  parent in a foreign key relationship.
sql/share/errmsg-utf8.txt:
  Add error message for truncate and FK.
sql/sql_lex.h:
  Introduce a flag so that the partition engine can detect when
  a partition is being truncated. Used to give a special error.
sql/sql_parse.cc:
  Function mysql_truncate_table no longer exists.
sql/sql_partition_admin.cc:
  Implement the TRUNCATE PARTITION statement.
sql/sql_truncate.cc:
  Change the truncate table implementation to use the new truncate
  handler method and to not rely on row-by-row delete anymore.
  
  The truncate handler method is always invoked with a exclusive
  metadata lock. Also, it is no longer possible to truncate a
  table that is parent in some non-self-referencing foreign key.
storage/archive/ha_archive.cc:
  Rename method as the description indicates that in the future
  this could be a truncate operation.
storage/blackhole/ha_blackhole.cc:
  Implement truncate as no operation for the blackhole engine in
  order to remain compatible with older releases.
storage/federated/ha_federated.cc:
  Introduce truncate method that invokes delete_all_rows.
  This is required to support partition truncate as this
  form of truncate does not implement the drop and recreate
  protocol.
storage/heap/ha_heap.cc:
  Introduce truncate method that invokes delete_all_rows.
  This is required to support partition truncate as this
  form of truncate does not implement the drop and recreate
  protocol.
storage/ibmdb2i/ha_ibmdb2i.cc:
  Introduce truncate method that invokes delete_all_rows.
  This is required to support partition truncate as this
  form of truncate does not implement the drop and recreate
  protocol.
storage/innobase/handler/ha_innodb.cc:
  Rename delete_all_rows to truncate. InnoDB now does truncate
  under a exclusive metadata lock.
  
  Introduce and reorganize methods used to retrieve the list
  of foreign keys referenced by a or referencing a table.
storage/myisammrg/ha_myisammrg.cc:
  Introduce truncate method that invokes delete_all_rows.
  This is required in order to remain compatible with earlier
  releases where truncate would resort to a row-by-row delete.
This commit is contained in:
Davi Arnaut 2010-10-06 11:34:28 -03:00
parent 4386615050
commit a5efb91dea
51 changed files with 1095 additions and 608 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

10
mysql-test/r/mdl_sync.result
View file

@ -2632,7 +2632,8 @@ DROP TABLE IF EXISTS t1;
CREATE TABLE t1 (a INT) ENGINE=InnoDB;
INSERT INTO t1 VALUES (1),(2),(3);
# Connection: con1
SET debug_sync='lock_table_for_truncate SIGNAL parked_truncate WAIT_FOR go_truncate';
LOCK TABLES t1 WRITE;
SET debug_sync='upgrade_lock_for_truncate SIGNAL parked_truncate WAIT_FOR go_truncate';
TRUNCATE TABLE t1;
# Connection: default
SET debug_sync='now WAIT_FOR parked_truncate';
@ -2647,10 +2648,11 @@ FLUSH TABLES t1;
# Connection: default
SET debug_sync='now WAIT_FOR parked_flush';
SET debug_sync='now SIGNAL go_truncate';
# Connection: con1
# Reaping...
# Connection: default
# Ensure that truncate waits for a exclusive lock
SET debug_sync= 'now SIGNAL go_show';
# Connection: con1 (TRUNCATE)
# Reaping...
UNLOCK TABLES;
# Connection: con2 (SHOW FIELDS FROM t1)
# Reaping...
Field Type Null Key Default Extra

17
mysql-test/r/sp_trans.result
View file

@ -585,3 +585,20 @@ UPDATE t1_aux SET f2 = 2 WHERE f1 = f1_two_inserts()|
ERROR 23000: Column 'f2' cannot be null
DROP TABLE t1_aux, t1_not_null|
DROP FUNCTION f1_two_inserts|
#
# Bug#49938: Failing assertion: inode or deadlock in fsp/fsp0fsp.c
#
DROP PROCEDURE IF EXISTS p1|
DROP TABLE IF EXISTS t1|
CREATE TABLE t1 (a INT) ENGINE=INNODB|
CREATE PROCEDURE p1()
BEGIN
TRUNCATE TABLE t1;
END|
LOCK TABLES t1 WRITE|
CALL p1()|
FLUSH TABLES;
UNLOCK TABLES|
CALL p1()|
DROP PROCEDURE p1|
DROP TABLE t1|

5
mysql-test/r/trigger-trans.result
View file

@ -151,9 +151,14 @@ CREATE TRIGGER t1_ad AFTER DELETE ON t1 FOR EACH ROW SET @b = 1;
SET @a = 0;
SET @b = 0;
TRUNCATE t1;
ERROR 42000: Cannot truncate a table referenced in a foreign key constraint (`test`.`t2`, CONSTRAINT `t2_ibfk_1` FOREIGN KEY (`b`) REFERENCES `test`.`t1` (`a`))
SELECT @a, @b;
@a @b
0 0
DELETE FROM t1;
SELECT @a, @b;
@a @b
1 1
INSERT INTO t1 VALUES (1);
DELETE FROM t1;
SELECT @a, @b;

68
mysql-test/suite/innodb/r/innodb-truncate.result Normal file
View file

@ -0,0 +1,68 @@
#
# TRUNCATE TABLE
#
# Truncating is disallowed for parent tables unless such table
# participates in self-referencing foreign keys only.
#
CREATE TABLE t1 (pk INT PRIMARY KEY) ENGINE=INNODB;
CREATE TABLE t2 (fk INT NOT NULL, FOREIGN KEY (fk) REFERENCES t1 (pk)) ENGINE=INNODB;
TRUNCATE TABLE t1;
ERROR 42000: Cannot truncate a table referenced in a foreign key constraint (`test`.`t2`, CONSTRAINT `t2_ibfk_1` FOREIGN KEY (`fk`) REFERENCES `test`.`t1` (`pk`))
# Truncation of child should succeed.
TRUNCATE TABLE t2;
DROP TABLE t2;
DROP TABLE t1;
CREATE TABLE t1 (pk INT PRIMARY KEY, fk INT,
FOREIGN KEY (fk) REFERENCES t1 (pk)) ENGINE=INNODB;
# Truncation of self-referencing table should succeed.
TRUNCATE TABLE t1;
DROP TABLE t1;
#
# Also, truncating such tables is allowed if foreign key
# checks are disabled.
#
SET @old_foreign_key_checks = @@SESSION.foreign_key_checks;
CREATE TABLE t1 (pk INT PRIMARY KEY) ENGINE=INNODB;
CREATE TABLE t2 (fk INT NOT NULL, FOREIGN KEY (fk) REFERENCES t1 (pk)) ENGINE=INNODB;
CREATE TABLE t3 (pk INT PRIMARY KEY, fk INT,
FOREIGN KEY (fk) REFERENCES t1 (pk)) ENGINE=INNODB;
SET @@SESSION.foreign_key_checks = 0;
TRUNCATE TABLE t1;
TRUNCATE TABLE t2;
TRUNCATE TABLE t3;
SET @@SESSION.foreign_key_checks = 1;
TRUNCATE TABLE t1;
ERROR 42000: Cannot truncate a table referenced in a foreign key constraint (`test`.`t2`, CONSTRAINT `t2_ibfk_1` FOREIGN KEY (`fk`) REFERENCES `test`.`t1` (`pk`))
TRUNCATE TABLE t2;
TRUNCATE TABLE t3;
LOCK TABLES t1 WRITE;
SET @@SESSION.foreign_key_checks = 0;
TRUNCATE TABLE t1;
SET @@SESSION.foreign_key_checks = 1;
TRUNCATE TABLE t1;
ERROR 42000: Cannot truncate a table referenced in a foreign key constraint (`test`.`t2`, CONSTRAINT `t2_ibfk_1` FOREIGN KEY (`fk`) REFERENCES `test`.`t1` (`pk`))
UNLOCK TABLES;
DROP TABLE t3,t2,t1;
SET @@SESSION.foreign_key_checks = @old_foreign_key_checks;
#
# Test that TRUNCATE resets auto-increment.
#
CREATE TABLE t1 (a INT PRIMARY KEY NOT NULL AUTO_INCREMENT);
INSERT INTO t1 VALUES (NULL), (NULL);
SELECT AUTO_INCREMENT FROM INFORMATION_SCHEMA.TABLES WHERE table_name = 't1';
AUTO_INCREMENT
3
SELECT * FROM t1 ORDER BY a;
a
1
2
TRUNCATE TABLE t1;
SELECT AUTO_INCREMENT FROM INFORMATION_SCHEMA.TABLES WHERE table_name = 't1';
AUTO_INCREMENT
1
INSERT INTO t1 VALUES (NULL), (NULL);
SELECT * FROM t1 ORDER BY a;
a
1
2
DROP TABLE t1;

12
mysql-test/suite/innodb/r/innodb.result
View file

@ -2424,10 +2424,6 @@ drop table t1,t2;
CREATE TABLE t1 (
id INTEGER NOT NULL AUTO_INCREMENT, PRIMARY KEY (id)
) ENGINE=InnoDB;
CREATE TABLE t2 (
id INTEGER NOT NULL,
FOREIGN KEY (id) REFERENCES t1 (id)
) ENGINE=InnoDB;
INSERT INTO t1 (id) VALUES (NULL);
SELECT * FROM t1;
id
@ -2443,7 +2439,7 @@ INSERT INTO t1 (id) VALUES (NULL);
SELECT * FROM t1;
id
1
DROP TABLE t2, t1;
DROP TABLE t1;
CREATE TABLE t1
(
id INT PRIMARY KEY
@ -2621,13 +2617,15 @@ ERROR 23000: Cannot delete or update a parent row: a foreign key constraint fail
update t4 set a=2;
ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (`test`.`t4`, CONSTRAINT `t4_ibfk_1` FOREIGN KEY (`a`) REFERENCES `t3` (`a`))
truncate t1;
ERROR 23000: Cannot delete or update a parent row: a foreign key constraint fails (`test`.`t2`, CONSTRAINT `t2_ibfk_1` FOREIGN KEY (`a`) REFERENCES `t1` (`a`))
ERROR 42000: Cannot truncate a table referenced in a foreign key constraint (`test`.`t2`, CONSTRAINT `t2_ibfk_1` FOREIGN KEY (`a`) REFERENCES `test`.`t1` (`a`))
truncate t3;
ERROR 23000: Cannot delete or update a parent row: a foreign key constraint fails (`test`.`t4`, CONSTRAINT `t4_ibfk_1` FOREIGN KEY (`a`) REFERENCES `t3` (`a`))
ERROR 42000: Cannot truncate a table referenced in a foreign key constraint (`test`.`t4`, CONSTRAINT `t4_ibfk_1` FOREIGN KEY (`a`) REFERENCES `test`.`t3` (`a`))
truncate t2;
truncate t4;
truncate t1;
ERROR 42000: Cannot truncate a table referenced in a foreign key constraint (`test`.`t2`, CONSTRAINT `t2_ibfk_1` FOREIGN KEY (`a`) REFERENCES `test`.`t1` (`a`))
truncate t3;
ERROR 42000: Cannot truncate a table referenced in a foreign key constraint (`test`.`t4`, CONSTRAINT `t4_ibfk_1` FOREIGN KEY (`a`) REFERENCES `test`.`t3` (`a`))
drop table t4,t3,t2,t1;
create table t1 (a varchar(255) character set utf8,
b varchar(255) character set utf8,

21
mysql-test/suite/innodb/r/innodb_mysql.result
View file

@ -1941,7 +1941,7 @@ INSERT INTO t2 VALUES (3,2);
SET AUTOCOMMIT = 0;
START TRANSACTION;
TRUNCATE TABLE t1;
ERROR 23000: Cannot delete or update a parent row: a foreign key constraint fails (`test`.`t2`, CONSTRAINT `t2_ibfk_1` FOREIGN KEY (`t1_id`) REFERENCES `t1` (`id`))
ERROR 42000: Cannot truncate a table referenced in a foreign key constraint (`test`.`t2`, CONSTRAINT `t2_ibfk_1` FOREIGN KEY (`t1_id`) REFERENCES `test`.`t1` (`id`))
SELECT * FROM t1;
id
1
@ -1953,7 +1953,7 @@ id
2
START TRANSACTION;
TRUNCATE TABLE t1;
ERROR 23000: Cannot delete or update a parent row: a foreign key constraint fails (`test`.`t2`, CONSTRAINT `t2_ibfk_1` FOREIGN KEY (`t1_id`) REFERENCES `t1` (`id`))
ERROR 42000: Cannot truncate a table referenced in a foreign key constraint (`test`.`t2`, CONSTRAINT `t2_ibfk_1` FOREIGN KEY (`t1_id`) REFERENCES `test`.`t1` (`id`))
SELECT * FROM t1;
id
1
@ -1971,7 +1971,7 @@ id
2
COMMIT;
TRUNCATE TABLE t1;
ERROR 23000: Cannot delete or update a parent row: a foreign key constraint fails (`test`.`t2`, CONSTRAINT `t2_ibfk_1` FOREIGN KEY (`t1_id`) REFERENCES `t1` (`id`))
ERROR 42000: Cannot truncate a table referenced in a foreign key constraint (`test`.`t2`, CONSTRAINT `t2_ibfk_1` FOREIGN KEY (`t1_id`) REFERENCES `test`.`t1` (`id`))
SELECT * FROM t1;
id
1
@ -1983,9 +1983,12 @@ id
1
2
TRUNCATE TABLE t1;
ERROR 42000: Cannot truncate a table referenced in a foreign key constraint (`test`.`t2`, CONSTRAINT `t2_ibfk_1` FOREIGN KEY (`t1_id`) REFERENCES `test`.`t1` (`id`))
ROLLBACK;
SELECT * FROM t1;
id
1
2
TRUNCATE TABLE t2;
DROP TABLE t2;
DROP TABLE t1;
@ -2077,9 +2080,9 @@ i i
** error handling inside a row iteration.
**
DROP TRIGGER trg;
TRUNCATE TABLE t1;
TRUNCATE TABLE t2;
TRUNCATE TABLE t3;
DELETE FROM t1;
DELETE FROM t2;
DELETE FROM t3;
INSERT INTO t1 VALUES (1),(2),(3),(4);
INSERT INTO t3 VALUES (1),(2),(3),(4);
INSERT INTO t4 VALUES (3,3),(4,4);
@ -2105,9 +2108,9 @@ DROP TRIGGER trg;
**
** Induce an error midway through an AFTER-trigger
**
TRUNCATE TABLE t4;
TRUNCATE TABLE t1;
TRUNCATE TABLE t3;
DELETE FROM t4;
DELETE FROM t1;
DELETE FROM t3;
INSERT INTO t1 VALUES (1),(2),(3),(4);
INSERT INTO t3 VALUES (1),(2),(3),(4);
CREATE TRIGGER trg AFTER DELETE ON t1 FOR EACH ROW

65
mysql-test/suite/innodb/t/innodb-truncate.test Normal file
View file

@ -0,0 +1,65 @@
--source include/have_innodb.inc
--echo #
--echo # TRUNCATE TABLE
--echo #
--echo # Truncating is disallowed for parent tables unless such table
--echo # participates in self-referencing foreign keys only.
--echo #
CREATE TABLE t1 (pk INT PRIMARY KEY) ENGINE=INNODB;
CREATE TABLE t2 (fk INT NOT NULL, FOREIGN KEY (fk) REFERENCES t1 (pk)) ENGINE=INNODB;
--error ER_TRUNCATE_ILLEGAL_FK
TRUNCATE TABLE t1;
--echo # Truncation of child should succeed.
TRUNCATE TABLE t2;
DROP TABLE t2;
DROP TABLE t1;
CREATE TABLE t1 (pk INT PRIMARY KEY, fk INT,
FOREIGN KEY (fk) REFERENCES t1 (pk)) ENGINE=INNODB;
--echo # Truncation of self-referencing table should succeed.
TRUNCATE TABLE t1;
DROP TABLE t1;
--echo #
--echo # Also, truncating such tables is allowed if foreign key
--echo # checks are disabled.
--echo #
SET @old_foreign_key_checks = @@SESSION.foreign_key_checks;
CREATE TABLE t1 (pk INT PRIMARY KEY) ENGINE=INNODB;
CREATE TABLE t2 (fk INT NOT NULL, FOREIGN KEY (fk) REFERENCES t1 (pk)) ENGINE=INNODB;
CREATE TABLE t3 (pk INT PRIMARY KEY, fk INT,
FOREIGN KEY (fk) REFERENCES t1 (pk)) ENGINE=INNODB;
SET @@SESSION.foreign_key_checks = 0;
TRUNCATE TABLE t1;
TRUNCATE TABLE t2;
TRUNCATE TABLE t3;
SET @@SESSION.foreign_key_checks = 1;
--error ER_TRUNCATE_ILLEGAL_FK
TRUNCATE TABLE t1;
TRUNCATE TABLE t2;
TRUNCATE TABLE t3;
LOCK TABLES t1 WRITE;
SET @@SESSION.foreign_key_checks = 0;
TRUNCATE TABLE t1;
SET @@SESSION.foreign_key_checks = 1;
--error ER_TRUNCATE_ILLEGAL_FK
TRUNCATE TABLE t1;
UNLOCK TABLES;
DROP TABLE t3,t2,t1;
SET @@SESSION.foreign_key_checks = @old_foreign_key_checks;
--echo #
--echo # Test that TRUNCATE resets auto-increment.
--echo #
CREATE TABLE t1 (a INT PRIMARY KEY NOT NULL AUTO_INCREMENT);
INSERT INTO t1 VALUES (NULL), (NULL);
SELECT AUTO_INCREMENT FROM INFORMATION_SCHEMA.TABLES WHERE table_name = 't1';
SELECT * FROM t1 ORDER BY a;
TRUNCATE TABLE t1;
SELECT AUTO_INCREMENT FROM INFORMATION_SCHEMA.TABLES WHERE table_name = 't1';
INSERT INTO t1 VALUES (NULL), (NULL);
SELECT * FROM t1 ORDER BY a;
DROP TABLE t1;

13
mysql-test/suite/innodb/t/innodb.test
View file

@ -1471,11 +1471,6 @@ CREATE TABLE t1 (
id INTEGER NOT NULL AUTO_INCREMENT, PRIMARY KEY (id)
) ENGINE=InnoDB;
CREATE TABLE t2 (
id INTEGER NOT NULL,
FOREIGN KEY (id) REFERENCES t1 (id)
) ENGINE=InnoDB;
INSERT INTO t1 (id) VALUES (NULL);
SELECT * FROM t1;
TRUNCATE t1;
@ -1488,7 +1483,7 @@ DELETE FROM t1;
TRUNCATE t1;
INSERT INTO t1 (id) VALUES (NULL);
SELECT * FROM t1;
DROP TABLE t2, t1;
DROP TABLE t1;
# Test that foreign keys in temporary tables are not accepted (bug #12084)
CREATE TABLE t1
@ -1723,13 +1718,15 @@ update t2 set a=2;
update t3 set a=2;
-- error 1452
update t4 set a=2;
-- error 1451
-- error ER_TRUNCATE_ILLEGAL_FK
truncate t1;
-- error 1451
-- error ER_TRUNCATE_ILLEGAL_FK
truncate t3;
truncate t2;
truncate t4;
-- error ER_TRUNCATE_ILLEGAL_FK
truncate t1;
-- error ER_TRUNCATE_ILLEGAL_FK
truncate t3;
drop table t4,t3,t2,t1;

19
mysql-test/suite/innodb/t/innodb_mysql.test
View file

@ -151,14 +151,14 @@ INSERT INTO t2 VALUES (3,2);
SET AUTOCOMMIT = 0;
START TRANSACTION;
--error ER_ROW_IS_REFERENCED_2
--error ER_TRUNCATE_ILLEGAL_FK
TRUNCATE TABLE t1;
SELECT * FROM t1;
COMMIT;
SELECT * FROM t1;
START TRANSACTION;
--error ER_ROW_IS_REFERENCED_2
--error ER_TRUNCATE_ILLEGAL_FK
TRUNCATE TABLE t1;
SELECT * FROM t1;
ROLLBACK;
@ -170,13 +170,14 @@ START TRANSACTION;
SELECT * FROM t1;
COMMIT;
--error ER_ROW_IS_REFERENCED_2
--error ER_TRUNCATE_ILLEGAL_FK
TRUNCATE TABLE t1;
SELECT * FROM t1;
DELETE FROM t2 WHERE id = 3;
START TRANSACTION;
SELECT * FROM t1;
--error ER_TRUNCATE_ILLEGAL_FK
TRUNCATE TABLE t1;
ROLLBACK;
SELECT * FROM t1;
@ -275,9 +276,9 @@ SELECT * FROM t1 LEFT JOIN t3 ON t1.i=t3.i;
--echo ** error handling inside a row iteration.
--echo **
DROP TRIGGER trg;
TRUNCATE TABLE t1;
TRUNCATE TABLE t2;
TRUNCATE TABLE t3;
DELETE FROM t1;
DELETE FROM t2;
DELETE FROM t3;
INSERT INTO t1 VALUES (1),(2),(3),(4);
INSERT INTO t3 VALUES (1),(2),(3),(4);
@ -304,9 +305,9 @@ DROP TRIGGER trg;
--echo **
--echo ** Induce an error midway through an AFTER-trigger
--echo **
TRUNCATE TABLE t4;
TRUNCATE TABLE t1;
TRUNCATE TABLE t3;
DELETE FROM t4;
DELETE FROM t1;
DELETE FROM t3;
INSERT INTO t1 VALUES (1),(2),(3),(4);
INSERT INTO t3 VALUES (1),(2),(3),(4);
delimiter ||;

10
mysql-test/suite/parts/inc/partition_check.inc
View file

@ -177,7 +177,7 @@ let $any_unique= `SELECT @my_errno IN ($ER_DUP_KEY,$ER_DUP_ENTRY)`;
# @my_errno AS sql_errno;
if (`SELECT @my_errno NOT IN (0,$ER_DUP_KEY,$ER_DUP_ENTRY)`)
{
--echo # The last command got an unexepected error response.
--echo # The last command got an unexpected error response.
--echo # Expected/handled SQL codes are 0,$ER_DUP_KEY,$ER_DUP_ENTRY
SELECT '# SQL code we got was: ' AS "", @my_errno AS "";
--echo # Sorry, have to abort.
@ -219,7 +219,7 @@ if ($any_unique)
# @my_errno AS sql_errno;
if (`SELECT @my_errno NOT IN (0,$ER_DUP_KEY,$ER_DUP_ENTRY)`)
{
--echo # The last command got an unexepected error response.
--echo # The last command got an unexpected error response.
--echo # Expected/handled SQL codes are 0,$ER_DUP_KEY,$ER_DUP_ENTRY
SELECT '# SQL code we got was: ' AS "", @my_errno AS "";
--echo # Sorry, have to abort.
@ -255,7 +255,7 @@ if ($any_unique)
# @my_errno AS sql_errno;
if (`SELECT @my_errno NOT IN (0,$ER_DUP_KEY,$ER_DUP_ENTRY)`)
{
--echo # The last command got an unexepected error response.
--echo # The last command got an unexpected error response.
--echo # Expected/handled SQL codes are 0,$ER_DUP_KEY,$ER_DUP_ENTRY
SELECT '# SQL code we got was: ' AS "", @my_errno AS "";
--echo # Sorry, have to abort.
@ -503,7 +503,7 @@ if ($no_debug)
eval SET @my_errno = $mysql_errno;
if (`SELECT @my_errno NOT IN (0,$ER_SAME_NAME_PARTITION,$ER_NO_PARTITION_FOR_GIVEN_VALUE)`)
{
--echo # The last command got an unexepected error response.
--echo # The last command got an unexpected error response.
--echo # Expected/handled SQL codes are 0,$ER_SAME_NAME_PARTITION,$ER_NO_PARTITION_FOR_GIVEN_VALUE
SELECT '# SQL code we got was: ' AS "", @my_errno AS "";
--echo # Sorry, have to abort.
@ -566,7 +566,7 @@ eval SET @my_errno = $mysql_errno;
let $run= `SELECT @my_errno = 0`;
if (`SELECT @my_errno NOT IN (0,$ER_BAD_NULL_ERROR)`)
{
--echo # The last command got an unexepected error response.
--echo # The last command got an unexpected error response.
--echo # Expected/handled SQL codes are 0,$ER_BAD_NULL_ERROR
SELECT '# SQL code we got was: ' AS "", @my_errno AS "";
--echo # Sorry, have to abort.

2
mysql-test/suite/sys_vars/r/foreign_key_checks_func.result
View file

@ -26,7 +26,7 @@ INSERT INTO t2 values (20,22);
ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (`test`.`t2`, CONSTRAINT `fk` FOREIGN KEY (`b`) REFERENCES `t1` (`a`))
'---Check when foreign_key_checks is disabled---'
TRUNCATE t1;
ERROR 23000: Cannot delete or update a parent row: a foreign key constraint fails (`test`.`t2`, CONSTRAINT `fk` FOREIGN KEY (`b`) REFERENCES `t1` (`a`))
ERROR 42000: Cannot truncate a table referenced in a foreign key constraint (`test`.`t2`, CONSTRAINT `fk` FOREIGN KEY (`b`) REFERENCES `test`.`t1` (`a`))
SET @@session.foreign_key_checks = 0;
TRUNCATE t1;
TRUNCATE t2;

2
mysql-test/suite/sys_vars/t/foreign_key_checks_func.test
View file

@ -76,7 +76,7 @@ INSERT INTO t2 values (20,22);
--echo '---Check when foreign_key_checks is disabled---'
#===========================================================
--Error ER_ROW_IS_REFERENCED_2
--Error ER_TRUNCATE_ILLEGAL_FK
TRUNCATE t1;
SET @@session.foreign_key_checks = 0;

15
mysql-test/t/mdl_sync.test
View file

@ -3969,7 +3969,8 @@ INSERT INTO t1 VALUES (1),(2),(3);
--echo # Connection: con1
connection con1;
SET debug_sync='lock_table_for_truncate SIGNAL parked_truncate WAIT_FOR go_truncate';
LOCK TABLES t1 WRITE;
SET debug_sync='upgrade_lock_for_truncate SIGNAL parked_truncate WAIT_FOR go_truncate';
send TRUNCATE TABLE t1;
connection default;
@ -3994,15 +3995,17 @@ connection default;
--echo # Connection: default
SET debug_sync='now WAIT_FOR parked_flush';
SET debug_sync='now SIGNAL go_truncate';
--echo # Ensure that truncate waits for a exclusive lock
let $wait_condition=SELECT COUNT(*)=1 FROM information_schema.processlist
WHERE state='Waiting for table metadata lock' AND info='TRUNCATE TABLE t1';
--source include/wait_condition.inc
SET debug_sync= 'now SIGNAL go_show';
connection con1;
--echo # Connection: con1
--echo # Connection: con1 (TRUNCATE)
--echo # Reaping...
reap;
connection default;
--echo # Connection: default
SET debug_sync= 'now SIGNAL go_show';
UNLOCK TABLES;
connection con2;
--echo # Connection: con2 (SHOW FIELDS FROM t1)

24
mysql-test/t/sp_trans.test
View file

@ -636,6 +636,30 @@ UPDATE t1_aux SET f2 = 2 WHERE f1 = f1_two_inserts()|
DROP TABLE t1_aux, t1_not_null|
DROP FUNCTION f1_two_inserts|
--echo #
--echo # Bug#49938: Failing assertion: inode or deadlock in fsp/fsp0fsp.c
--echo #
--disable_warnings
DROP PROCEDURE IF EXISTS p1|
DROP TABLE IF EXISTS t1|
--enable_warnings
CREATE TABLE t1 (a INT) ENGINE=INNODB|
CREATE PROCEDURE p1()
BEGIN
TRUNCATE TABLE t1;
END|
LOCK TABLES t1 WRITE|
CALL p1()|
FLUSH TABLES;
UNLOCK TABLES|
CALL p1()|
DROP PROCEDURE p1|
DROP TABLE t1|
#
# BUG#NNNN: New bug synopsis

5
mysql-test/t/trigger-trans.test
View file

@ -148,10 +148,15 @@ CREATE TRIGGER t1_ad AFTER DELETE ON t1 FOR EACH ROW SET @b = 1;
SET @a = 0;
SET @b = 0;
--error ER_TRUNCATE_ILLEGAL_FK
TRUNCATE t1;
SELECT @a, @b;
DELETE FROM t1;
SELECT @a, @b;
INSERT INTO t1 VALUES (1);
DELETE FROM t1;

192
sql/ha_partition.cc
View file

@ -3337,113 +3337,123 @@ int ha_partition::delete_row(const uchar *buf)
Called from sql_delete.cc by mysql_delete().
Called from sql_select.cc by JOIN::reinit().
Called from sql_union.cc by st_select_lex_unit::exec().
Also used for handle ALTER TABLE t TRUNCATE PARTITION ...
NOTE: auto increment value will be truncated in that partition as well!
*/
int ha_partition::delete_all_rows()
{
int error;
bool truncate= FALSE;
handler **file;
THD *thd= ha_thd();
DBUG_ENTER("ha_partition::delete_all_rows");
if (thd->lex->sql_command == SQLCOM_TRUNCATE)
{
Alter_info *alter_info= &thd->lex->alter_info;
/* TRUNCATE also means resetting auto_increment */
lock_auto_increment();
table_share->ha_part_data->next_auto_inc_val= 0;
table_share->ha_part_data->auto_inc_initialized= FALSE;
unlock_auto_increment();
if (alter_info->flags & ALTER_ADMIN_PARTITION)
{
/* ALTER TABLE t TRUNCATE PARTITION ... */
List_iterator<partition_element> part_it(m_part_info->partitions);
int saved_error= 0;
uint num_parts= m_part_info->num_parts;
uint num_subparts= m_part_info->num_subparts;
uint i= 0;
uint num_parts_set= alter_info->partition_names.elements;
uint num_parts_found= set_part_state(alter_info, m_part_info,
PART_ADMIN);
if (num_parts_set != num_parts_found &&
(!(alter_info->flags & ALTER_ALL_PARTITION)))
DBUG_RETURN(HA_ERR_NO_PARTITION_FOUND);
/*
Cannot return HA_ERR_WRONG_COMMAND here without correct pruning
since that whould delete the whole table row by row in sql_delete.cc
*/
bitmap_clear_all(&m_part_info->used_partitions);
do
{
partition_element *part_elem= part_it++;
if (part_elem->part_state == PART_ADMIN)
{
if (m_is_sub_partitioned)
{
List_iterator<partition_element>
subpart_it(part_elem->subpartitions);
partition_element *sub_elem;
uint j= 0, part;
do
{
sub_elem= subpart_it++;
part= i * num_subparts + j;
bitmap_set_bit(&m_part_info->used_partitions, part);
if (!saved_error)
{
DBUG_PRINT("info", ("truncate subpartition %u (%s)",
part, sub_elem->partition_name));
if ((error= m_file[part]->ha_delete_all_rows()))
saved_error= error;
/* If not reset_auto_increment is supported, just accept it */
if (!saved_error &&
(error= m_file[part]->ha_reset_auto_increment(0)) &&
error != HA_ERR_WRONG_COMMAND)
saved_error= error;
}
} while (++j < num_subparts);
}
else
{
DBUG_PRINT("info", ("truncate partition %u (%s)", i,
part_elem->partition_name));
bitmap_set_bit(&m_part_info->used_partitions, i);
if (!saved_error)
{
if ((error= m_file[i]->ha_delete_all_rows()) && !saved_error)
saved_error= error;
/* If not reset_auto_increment is supported, just accept it */
if (!saved_error &&
(error= m_file[i]->ha_reset_auto_increment(0)) &&
error != HA_ERR_WRONG_COMMAND)
saved_error= error;
}
}
part_elem->part_state= PART_NORMAL;
}
} while (++i < num_parts);
DBUG_RETURN(saved_error);
}
truncate= TRUE;
}
file= m_file;
do
{
if ((error= (*file)->ha_delete_all_rows()))
DBUG_RETURN(error);
/* Ignore the error */
if (truncate)
(void) (*file)->ha_reset_auto_increment(0);
} while (*(++file));
DBUG_RETURN(0);
}
/**
Manually truncate the table.
@retval 0 Success.
@retval > 0 Error code.
*/
int ha_partition::truncate()
{
int error;
handler **file;
DBUG_ENTER("ha_partition::truncate");
/*
TRUNCATE also means resetting auto_increment. Hence, reset
it so that it will be initialized again at the next use.
*/
lock_auto_increment();
table_share->ha_part_data->next_auto_inc_val= 0;
table_share->ha_part_data->auto_inc_initialized= FALSE;
unlock_auto_increment();
file= m_file;
do
{
if ((error= (*file)->ha_truncate()))
DBUG_RETURN(error);
} while (*(++file));
DBUG_RETURN(0);
}
/**
Truncate a set of specific partitions.
@remark Auto increment value will be truncated in that partition as well!
ALTER TABLE t TRUNCATE PARTITION ...
*/
int ha_partition::truncate_partition(Alter_info *alter_info)
{
int error= 0;
List_iterator<partition_element> part_it(m_part_info->partitions);
uint num_parts= m_part_info->num_parts;
uint num_subparts= m_part_info->num_subparts;
uint i= 0;
uint num_parts_set= alter_info->partition_names.elements;
uint num_parts_found= set_part_state(alter_info, m_part_info,
PART_ADMIN);
DBUG_ENTER("ha_partition::truncate_partition");
/*
TRUNCATE also means resetting auto_increment. Hence, reset
it so that it will be initialized again at the next use.
*/
lock_auto_increment();
table_share->ha_part_data->next_auto_inc_val= 0;
table_share->ha_part_data->auto_inc_initialized= FALSE;
unlock_auto_increment();
if (num_parts_set != num_parts_found &&
(!(alter_info->flags & ALTER_ALL_PARTITION)))
DBUG_RETURN(HA_ERR_NO_PARTITION_FOUND);
do
{
partition_element *part_elem= part_it++;
if (part_elem->part_state == PART_ADMIN)
{
if (m_is_sub_partitioned)
{
List_iterator<partition_element>
subpart_it(part_elem->subpartitions);
partition_element *sub_elem;
uint j= 0, part;
do
{
sub_elem= subpart_it++;
part= i * num_subparts + j;
DBUG_PRINT("info", ("truncate subpartition %u (%s)",
part, sub_elem->partition_name));
if ((error= m_file[part]->ha_truncate()))
break;
} while (++j < num_subparts);
}
else
{
DBUG_PRINT("info", ("truncate partition %u (%s)", i,
part_elem->partition_name));
error= m_file[i]->ha_truncate();
}
part_elem->part_state= PART_NORMAL;
}
} while (!error && (++i < num_parts));
DBUG_RETURN(error);
}
/*
Start a large batch of insert rows
@ -6327,8 +6337,8 @@ void ha_partition::print_error(int error, myf errflag)
/* Should probably look for my own errors first */
DBUG_PRINT("enter", ("error: %d", error));
if (error == HA_ERR_NO_PARTITION_FOUND &&
thd->lex->sql_command != SQLCOM_TRUNCATE)
if ((error == HA_ERR_NO_PARTITION_FOUND) &&
! (thd->lex->alter_info.flags & ALTER_TRUNCATE_PARTITION))
m_part_info->print_no_partition_found(table);
else
{

10
sql/ha_partition.h
View file

@ -346,6 +346,7 @@ public:
virtual int update_row(const uchar * old_data, uchar * new_data);
virtual int delete_row(const uchar * buf);
virtual int delete_all_rows(void);
virtual int truncate();
virtual void start_bulk_insert(ha_rows rows);
virtual int end_bulk_insert();
private:
@ -354,6 +355,15 @@ private:
long estimate_read_buffer_size(long original_size);
public:
/*
Method for truncating a specific partition.
(i.e. ALTER TABLE t1 TRUNCATE PARTITION p).
@remark This method is a partitioning-specific hook
and thus not a member of the general SE API.
*/
int truncate_partition(Alter_info *);
virtual bool is_fatal_error(int error, uint flags)
{
if (!handler::is_fatal_error(error, flags) ||

15
sql/handler.cc
View file

@ -3208,6 +3208,21 @@ handler::ha_delete_all_rows()
}
/**
Truncate table: public interface.
@sa handler::truncate()
*/
int
handler::ha_truncate()
{
mark_trx_read_write();
return truncate();
}
/**
Reset auto increment: public interface.

58
sql/handler.h
View file

@ -1331,6 +1331,7 @@ public:
int ha_bulk_update_row(const uchar *old_data, uchar *new_data,
uint *dup_key_found);
int ha_delete_all_rows();
int ha_truncate();
int ha_reset_auto_increment(ulonglong value);
int ha_optimize(THD* thd, HA_CHECK_OPT* check_opt);
int ha_analyze(THD* thd, HA_CHECK_OPT* check_opt);
@ -1644,8 +1645,33 @@ public:
{ return(NULL);} /* gets tablespace name from handler */
/** used in ALTER TABLE; 1 if changing storage engine is allowed */
virtual bool can_switch_engines() { return 1; }
/** used in REPLACE; is > 0 if table is referred by a FOREIGN KEY */
virtual int get_foreign_key_list(THD *thd, List<FOREIGN_KEY_INFO> *f_key_list)
/**
Get the list of foreign keys in this table.
@remark Returns the set of foreign keys where this table is the
dependent or child table.
@param thd The thread handle.
@param f_key_list[out] The list of foreign keys.
@return The handler error code or zero for success.
*/
virtual int
get_foreign_key_list(THD *thd, List<FOREIGN_KEY_INFO> *f_key_list)
{ return 0; }
/**
Get the list of foreign keys referencing this table.
@remark Returns the set of foreign keys where this table is the
referenced or parent table.
@param thd The thread handle.
@param f_key_list[out] The list of foreign keys.
@return The handler error code or zero for success.
*/
virtual int
get_parent_foreign_key_list(THD *thd, List<FOREIGN_KEY_INFO> *f_key_list)
{ return 0; }
virtual uint referenced_by_foreign_key() { return 0;}
virtual void init_table_handle_for_HANDLER()
@ -2010,16 +2036,34 @@ private:
This is called to delete all rows in a table
If the handler don't support this, then this function will
return HA_ERR_WRONG_COMMAND and MySQL will delete the rows one
by one. It should reset auto_increment if
thd->lex->sql_command == SQLCOM_TRUNCATE.
by one.
*/
virtual int delete_all_rows()
{ return (my_errno=HA_ERR_WRONG_COMMAND); }
/**
Quickly remove all rows from a table.
@remark This method is responsible for implementing MySQL's TRUNCATE
TABLE statement, which is a DDL operation. As such, a engine
can bypass certain integrity checks and in some cases avoid
fine-grained locking (e.g. row locks) which would normally be
required for a DELETE statement.
@remark Typically, truncate is not used if it can result in integrity
violation. For example, truncate is not used when a foreign
key references the table, but it might be used if foreign key
checks are disabled.
@remark Engine is responsible for resetting the auto-increment counter.
@remark The table is locked in exclusive mode.
*/
virtual int truncate()
{ return HA_ERR_WRONG_COMMAND; }
/**
Reset the auto-increment counter to the given value, i.e. the next row
inserted will get the given value. This is called e.g. after TRUNCATE
is emulated by doing a 'DELETE FROM t'. HA_ERR_WRONG_COMMAND is
returned by storage engines that don't support this operation.
inserted will get the given value. HA_ERR_WRONG_COMMAND is returned by
storage engines that don't support this operation.
*/
virtual int reset_auto_increment(ulonglong value)
{ return HA_ERR_WRONG_COMMAND; }

3
sql/share/errmsg-utf8.txt
View file

@ -6379,3 +6379,6 @@ ER_SET_PASSWORD_AUTH_PLUGIN
ER_GRANT_PLUGIN_USER_EXISTS
eng "GRANT with IDENTIFIED WITH is illegal because the user %-.*s already exists"
ER_TRUNCATE_ILLEGAL_FK 42000
eng "Cannot truncate a table referenced in a foreign key constraint (%.192s)"

1
sql/sql_lex.h
View file

@ -958,6 +958,7 @@ inline bool st_select_lex_unit::is_union ()
#define ALTER_ALL_PARTITION (1L << 21)
#define ALTER_REMOVE_PARTITIONING (1L << 22)
#define ALTER_FOREIGN_KEY (1L << 23)
#define ALTER_TRUNCATE_PARTITION (1L << 24)
enum enum_alter_table_change_level
{

3
sql/sql_parse.cc
View file

@ -34,7 +34,7 @@
#include "sql_locale.h" // my_locale_en_US
#include "log.h" // flush_error_log
#include "sql_view.h" // mysql_create_view, mysql_drop_view
#include "sql_delete.h" // mysql_truncate, mysql_delete
#include "sql_delete.h" // mysql_delete
#include "sql_insert.h" // mysql_insert
#include "sql_update.h" // mysql_update, mysql_multi_update
#include "sql_partition.h" // struct partition_info
@ -49,7 +49,6 @@
// mysql_recreate_table,
// mysql_backup_table,
// mysql_restore_table
#include "sql_truncate.h" // mysql_truncate_table
#include "sql_reload.h" // reload_acl_and_cache
#include "sql_admin.h" // mysql_assign_to_keycache
#include "sql_connect.h" // check_user,

95
sql/sql_partition_admin.cc
View file

@ -16,10 +16,10 @@
#include "sql_parse.h" // check_one_table_access
#include "sql_table.h" // mysql_alter_table, etc.
#include "sql_lex.h" // Sql_statement
#include "sql_truncate.h" // mysql_truncate_table,
// Truncate_statement
#include "sql_admin.h" // Analyze/Check/.._table_statement
#include "sql_partition_admin.h" // Alter_table_*_partition
#include "ha_partition.h" // ha_partition
#include "sql_base.h" // open_and_lock_tables
#ifndef WITH_PARTITION_STORAGE_ENGINE
@ -46,7 +46,7 @@ bool Alter_table_analyze_partition_statement::execute(THD *thd)
m_lex->alter_info.flags|= ALTER_ADMIN_PARTITION;
res= Analyze_table_statement::execute(thd);
DBUG_RETURN(res);
}
@ -104,36 +104,85 @@ bool Alter_table_repair_partition_statement::execute(THD *thd)
bool Alter_table_truncate_partition_statement::execute(THD *thd)
{
int error;
ha_partition *partition;
ulong timeout= thd->variables.lock_wait_timeout;
TABLE_LIST *first_table= thd->lex->select_lex.table_list.first;
bool res;
enum_sql_command original_sql_command;
DBUG_ENTER("Alter_table_truncate_partition_statement::execute");
/*
Execute TRUNCATE PARTITION just like TRUNCATE TABLE.
Some storage engines (InnoDB, partition) checks thd_sql_command,
so we set it to SQLCOM_TRUNCATE during the execution.
*/
original_sql_command= m_lex->sql_command;
m_lex->sql_command= SQLCOM_TRUNCATE;
/*
Flag that it is an ALTER command which administrates partitions, used
by ha_partition.
*/
m_lex->alter_info.flags|= ALTER_ADMIN_PARTITION;
/*
Fix the lock types (not the same as ordinary ALTER TABLE).
*/
m_lex->alter_info.flags|= ALTER_ADMIN_PARTITION |
ALTER_TRUNCATE_PARTITION;
/* Fix the lock types (not the same as ordinary ALTER TABLE). */
first_table->lock_type= TL_WRITE;
first_table->mdl_request.set_type(MDL_SHARED_NO_READ_WRITE);
first_table->mdl_request.set_type(MDL_EXCLUSIVE);
/* execute as a TRUNCATE TABLE */
res= Truncate_statement::execute(thd);
/*
Check table permissions and open it with a exclusive lock.
Ensure it is a partitioned table and finally, upcast the
handler and invoke the partition truncate method. Lastly,
write the statement to the binary log if necessary.
*/
m_lex->sql_command= original_sql_command;
DBUG_RETURN(res);
if (check_one_table_access(thd, DROP_ACL, first_table))
DBUG_RETURN(TRUE);
if (open_and_lock_tables(thd, first_table, FALSE, 0))
DBUG_RETURN(TRUE);
/*
TODO: Add support for TRUNCATE PARTITION for NDB and other
engines supporting native partitioning.
*/
if (first_table->table->s->db_type() != partition_hton)
{
my_error(ER_PARTITION_MGMT_ON_NONPARTITIONED, MYF(0));
DBUG_RETURN(TRUE);
}
/*
Under locked table modes this might still not be an exclusive
lock. Hence, upgrade the lock since the handler truncate method
mandates an exclusive metadata lock.
*/
MDL_ticket *ticket= first_table->table->mdl_ticket;
if (thd->mdl_context.upgrade_shared_lock_to_exclusive(ticket, timeout))
DBUG_RETURN(TRUE);
tdc_remove_table(thd, TDC_RT_REMOVE_NOT_OWN, first_table->db,
first_table->table_name, FALSE);
partition= (ha_partition *) first_table->table->file;
/* Invoke the handler method responsible for truncating the partition. */
if ((error= partition->truncate_partition(&thd->lex->alter_info)))
first_table->table->file->print_error(error, MYF(0));
/*
All effects of a truncate operation are committed even if the
operation fails. Thus, the query must be written to the binary
log. The only exception is a unimplemented truncate method. Also,
it is logged in statement format, regardless of the binlog format.
*/
if (error != HA_ERR_WRONG_COMMAND)
error|= write_bin_log(thd, !error, thd->query(), thd->query_length());
/*
A locked table ticket was upgraded to a exclusive lock. After the
the query has been written to the binary log, downgrade the lock
to a shared one.
*/
if (thd->locked_tables_mode)
ticket->downgrade_exclusive_lock(MDL_SHARED_NO_READ_WRITE);
if (! error)
my_ok(thd);
DBUG_RETURN(error);
}
#endif /* WITH_PARTITION_STORAGE_ENGINE */

6
sql/sql_partition_admin.h
View file

@ -210,7 +210,7 @@ public:
/**
Class that represents the ALTER TABLE t1 TRUNCATE PARTITION p statement.
*/
class Alter_table_truncate_partition_statement : public Truncate_statement
class Alter_table_truncate_partition_statement : public Sql_statement
{
public:
/**
@ -218,10 +218,10 @@ public:
@param lex the LEX structure for this statement.
*/
Alter_table_truncate_partition_statement(LEX *lex)
: Truncate_statement(lex)
: Sql_statement(lex)
{}
~Alter_table_truncate_partition_statement()
virtual ~Alter_table_truncate_partition_statement()
{}
/**

12
sql/sql_show.cc
View file

@ -5063,8 +5063,8 @@ static int get_schema_constraints_record(THD *thd, TABLE_LIST *tables,
while ((f_key_info=it++))
{
if (store_constraints(thd, table, db_name, table_name,
f_key_info->forein_id->str,
strlen(f_key_info->forein_id->str),
f_key_info->foreign_id->str,
strlen(f_key_info->foreign_id->str),
"FOREIGN KEY", 11))
DBUG_RETURN(1);
}
@ -5263,8 +5263,8 @@ static int get_schema_key_column_usage_record(THD *thd,
f_idx++;
restore_record(table, s->default_values);
store_key_column_usage(table, db_name, table_name,
f_key_info->forein_id->str,
f_key_info->forein_id->length,
f_key_info->foreign_id->str,
f_key_info->foreign_id->length,
f_info->str, f_info->length,
(longlong) f_idx);
table->field[8]->store((longlong) f_idx, TRUE);
@ -6053,8 +6053,8 @@ get_referential_constraints_record(THD *thd, TABLE_LIST *tables,
table->field[0]->store(STRING_WITH_LEN("def"), cs);
table->field[1]->store(db_name->str, db_name->length, cs);
table->field[9]->store(table_name->str, table_name->length, cs);
table->field[2]->store(f_key_info->forein_id->str,
f_key_info->forein_id->length, cs);
table->field[2]->store(f_key_info->foreign_id->str,
f_key_info->foreign_id->length, cs);
table->field[3]->store(STRING_WITH_LEN("def"), cs);
table->field[4]->store(f_key_info->referenced_db->str,
f_key_info->referenced_db->length, cs);

8
sql/sql_string.h
View file

@ -265,8 +265,12 @@ public:
CHARSET_INFO *csto, uint *errors);
bool append(const String &s);
bool append(const char *s);
bool append(const char *s,uint32 arg_length);
bool append(const char *s,uint32 arg_length, CHARSET_INFO *cs);
bool append(LEX_STRING *ls)
{
return append(ls->str, ls->length);
}
bool append(const char *s, uint32 arg_length);
bool append(const char *s, uint32 arg_length, CHARSET_INFO *cs);
bool append_ulonglong(ulonglong val);
bool append(IO_CACHE* file, uint32 arg_length);
bool append_with_prefill(const char *s, uint32 arg_length,

487
sql/sql_truncate.cc
View file

@ -13,11 +13,8 @@
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
#include "sql_priv.h"
#include "transaction.h"
#include "debug_sync.h"
#include "records.h" // READ_RECORD
#include "table.h" // TABLE
#include "debug_sync.h" // DEBUG_SYNC
#include "table.h" // TABLE, FOREIGN_KEY_INFO
#include "sql_class.h" // THD
#include "sql_base.h" // open_and_lock_tables
#include "sql_table.h" // write_bin_log
@ -29,145 +26,212 @@
#include "sql_truncate.h"
/*
Delete all rows of a locked table.
/**
Append a list of field names to a string.
@param thd Thread context.
@param table_list Table list element for the table.
@param rows_deleted Whether rows might have been deleted.
@param str The string.
@param fields The list of field names.
@retval FALSE Success.
@retval TRUE Error.
@return TRUE on failure, FALSE otherwise.
*/
static bool fk_info_append_fields(String *str, List<LEX_STRING> *fields)
{
bool res= FALSE;
LEX_STRING *field;
List_iterator_fast<LEX_STRING> it(*fields);
while ((field= it++))
{
res|= str->append("`");
res|= str->append(field);
res|= str->append("`, ");
}
str->chop();
str->chop();
return res;
}
/**
Generate a foreign key description suitable for a error message.
@param thd Thread context.
@param fk_info The foreign key information.
@return A human-readable string describing the foreign key.
*/
static const char *fk_info_str(THD *thd, FOREIGN_KEY_INFO *fk_info)
{
bool res= FALSE;
char buffer[STRING_BUFFER_USUAL_SIZE*2];
String str(buffer, sizeof(buffer), system_charset_info);
str.length(0);
/*
`db`.`tbl`, CONSTRAINT `id` FOREIGN KEY (`fk`) REFERENCES `db`.`tbl` (`fk`)
*/
res|= str.append('`');
res|= str.append(fk_info->foreign_db);
res|= str.append("`.`");
res|= str.append(fk_info->foreign_table);
res|= str.append("`, CONSTRAINT `");
res|= str.append(fk_info->foreign_id);
res|= str.append("` FOREIGN KEY (");
res|= fk_info_append_fields(&str, &fk_info->foreign_fields);
res|= str.append(") REFERENCES `");
res|= str.append(fk_info->referenced_db);
res|= str.append("`.`");
res|= str.append(fk_info->referenced_table);
res|= str.append("` (");
res|= fk_info_append_fields(&str, &fk_info->referenced_fields);
res|= str.append(')');
return res ? NULL : thd->strmake(str.ptr(), str.length());
}
/**
Check and emit a fatal error if the table which is going to be
affected by TRUNCATE TABLE is a parent table in some non-self-
referencing foreign key.
@remark The intention is to allow truncate only for tables that
are not dependent on other tables.
@param thd Thread context.
@param table Table handle.
@retval FALSE This table is not parent in a non-self-referencing foreign
key. Statement can proceed.
@retval TRUE This table is parent in a non-self-referencing foreign key,
error was emitted.
*/
static bool
delete_all_rows(THD *thd, TABLE *table)
fk_truncate_illegal_if_parent(THD *thd, TABLE *table)
{
int error;
READ_RECORD info;
bool is_bulk_delete;
bool some_rows_deleted= FALSE;
bool save_binlog_row_based= thd->is_current_stmt_binlog_format_row();
DBUG_ENTER("delete_all_rows");
/* Replication of truncate table must be statement based. */
thd->clear_current_stmt_binlog_format_row();
FOREIGN_KEY_INFO *fk_info;
List<FOREIGN_KEY_INFO> fk_list;
List_iterator_fast<FOREIGN_KEY_INFO> it;
/*
Update handler statistics (e.g. table->file->stats.records).
Might be used by the storage engine to aggregate information
necessary to allow deletion. Currently, this seems to be
meaningful only to the archive storage engine, which uses
the info method to set the number of records. Although
archive does not support deletion, it becomes necessary in
order to return a error if the table is not empty.
Bail out early if the table is not referenced by a foreign key.
In this case, the table could only be, if at all, a child table.
*/
error= table->file->info(HA_STATUS_VARIABLE | HA_STATUS_NO_LOCK);
if (error && error != HA_ERR_WRONG_COMMAND)
{
table->file->print_error(error, MYF(0));
goto end;
}
if (! table->file->referenced_by_foreign_key())
return FALSE;
/*
Attempt to delete all rows in the table.
If it is unsupported, switch to row by row deletion.
This table _is_ referenced by a foreign key. At this point, only
self-referencing keys are acceptable. For this reason, get the list
of foreign keys referencing this table in order to check the name
of the child (dependent) tables.
*/
if (! (error= table->file->ha_delete_all_rows()))
goto end;
table->file->get_parent_foreign_key_list(thd, &fk_list);
if (error != HA_ERR_WRONG_COMMAND)
{
/*
If a transactional engine fails in the middle of deletion,
we expect it to be able to roll it back. Some reasons
for the engine to fail would be media failure or corrupted
data dictionary (i.e. in case of a partitioned table). We
have sufficiently strong metadata locks to rule out any
potential deadlocks.
If a non-transactional engine fails here (that would
not be MyISAM, since MyISAM does TRUNCATE by recreate),
and binlog is on, replication breaks, since nothing gets
written to the binary log. (XXX: is this a bug?)
*/
table->file->print_error(error, MYF(0));
goto end;
}
/*
A workaround for Bug#53696 "Performance schema engine violates the
PSEA API by calling my_error()".
*/
/* Out of memory when building list. */
if (thd->is_error())
goto end;
return TRUE;
/* Handler didn't support fast delete. Delete rows one by one. */
it.init(fk_list);
init_read_record(&info, thd, table, NULL, TRUE, TRUE, FALSE);
/*
Start bulk delete. If the engine does not support it, go on,
it's not an error.
*/
is_bulk_delete= ! table->file->start_bulk_delete();
table->mark_columns_needed_for_delete();
while (!(error= info.read_record(&info)) && !thd->killed)
/* Loop over the set of foreign keys for which this table is a parent. */
while ((fk_info= it++))
{
if ((error= table->file->ha_delete_row(table->record[0])))
{
table->file->print_error(error, MYF(0));
DBUG_ASSERT(!my_strcasecmp(system_charset_info,
fk_info->referenced_db->str,
table->s->db.str));
DBUG_ASSERT(!my_strcasecmp(system_charset_info,
fk_info->referenced_table->str,
table->s->table_name.str));
if (my_strcasecmp(system_charset_info, fk_info->foreign_db->str,
table->s->db.str) ||
my_strcasecmp(system_charset_info, fk_info->foreign_table->str,
table->s->table_name.str))
break;
}
some_rows_deleted= TRUE;
}
/* HA_ERR_END_OF_FILE */
if (error == -1)
error= 0;
/* Close down the bulk delete. */
if (is_bulk_delete)
/* Table is parent in a non-self-referencing foreign key. */
if (fk_info)
{
int bulk_delete_error= table->file->end_bulk_delete();
if (bulk_delete_error && !error)
{
table->file->print_error(bulk_delete_error, MYF(0));
error= bulk_delete_error;
}
my_error(ER_TRUNCATE_ILLEGAL_FK, MYF(0), fk_info_str(thd, fk_info));
return TRUE;
}
end_read_record(&info);
return FALSE;
}
/*
Open and truncate a locked table.
@param thd Thread context.
@param table_ref Table list element for the table to be truncated.
@param is_tmp_table True if element refers to a temp table.
@retval 0 Success.
@retval > 0 Error code.
*/
int Truncate_statement::handler_truncate(THD *thd, TABLE_LIST *table_ref,
bool is_tmp_table)
{
int error= 0;
uint flags;
DBUG_ENTER("Truncate_statement::handler_truncate");
/*
Regardless of the error status, the query must be written to the
binary log if rows of the table is non-transactional.
Can't recreate, the engine must mechanically delete all rows
in the table. Use open_and_lock_tables() to open a write cursor.
*/
if (some_rows_deleted && !table->file->has_transactions())
/* If it is a temporary table, no need to take locks. */
if (is_tmp_table)
flags= MYSQL_OPEN_TEMPORARY_ONLY;
else
{
thd->transaction.stmt.modified_non_trans_table= TRUE;
thd->transaction.all.modified_non_trans_table= TRUE;
/* We don't need to load triggers. */
DBUG_ASSERT(table_ref->trg_event_map == 0);
/*
Our metadata lock guarantees that no transaction is reading
or writing into the table. Yet, to open a write cursor we need
a thr_lock lock. Allow to open base tables only.
*/
table_ref->required_type= FRMTYPE_TABLE;
/*
Ignore pending FLUSH TABLES since we don't want to release
the MDL lock taken above and otherwise there is no way to
wait for FLUSH TABLES in deadlock-free fashion.
*/
flags= MYSQL_OPEN_IGNORE_FLUSH | MYSQL_OPEN_SKIP_TEMPORARY;
/*
Even though we have an MDL lock on the table here, we don't
pass MYSQL_OPEN_HAS_MDL_LOCK to open_and_lock_tables
since to truncate a MERGE table, we must open and lock
merge children, and on those we don't have an MDL lock.
Thus clear the ticket to satisfy MDL asserts.
*/
table_ref->mdl_request.ticket= NULL;
}
if (error || thd->killed)
goto end;
/* Open the table as it will handle some required preparations. */
if (open_and_lock_tables(thd, table_ref, FALSE, flags))
DBUG_RETURN(1);
/* Truncate resets the auto-increment counter. */
error= table->file->ha_reset_auto_increment(0);
if (error)
{
if (error != HA_ERR_WRONG_COMMAND)
table->file->print_error(error, MYF(0));
else
error= 0;
}
/* Whether to truncate regardless of foreign keys. */
if (! (thd->variables.option_bits & OPTION_NO_FOREIGN_KEY_CHECKS))
error= fk_truncate_illegal_if_parent(thd, table_ref->table);
end:
if (save_binlog_row_based)
thd->set_current_stmt_binlog_format_row();
if (!error && (error= table_ref->table->file->ha_truncate()))
table_ref->table->file->print_error(error, MYF(0));
DBUG_RETURN(error);
}
@ -225,30 +289,29 @@ static bool recreate_temporary_table(THD *thd, TABLE *table)
/*
Handle opening and locking if a base table for truncate.
Handle locking a base table for truncate.
@param[in] thd Thread context.
@param[in] table_ref Table list element for the table to
be truncated.
@param[out] hton_can_recreate Set to TRUE if table can be dropped
and recreated.
@param[out] ticket_downgrade Set if a lock must be downgraded after
truncate is done.
@retval FALSE Success.
@retval TRUE Error.
*/
static bool open_and_lock_table_for_truncate(THD *thd, TABLE_LIST *table_ref,
bool *hton_can_recreate,
MDL_ticket **ticket_downgrade)
bool Truncate_statement::lock_table(THD *thd, TABLE_LIST *table_ref,
bool *hton_can_recreate)
{
TABLE *table= NULL;
handlerton *table_type;
DBUG_ENTER("open_and_lock_table_for_truncate");
DBUG_ENTER("Truncate_statement::lock_table");
/* Lock types are set in the parser. */
DBUG_ASSERT(table_ref->lock_type == TL_WRITE);
DBUG_ASSERT(table_ref->mdl_request.type == MDL_SHARED_NO_READ_WRITE);
/* The handler truncate protocol dictates a exclusive lock. */
DBUG_ASSERT(table_ref->mdl_request.type == MDL_EXCLUSIVE);
/*
Before doing anything else, acquire a metadata lock on the table,
or ensure we have one. We don't use open_and_lock_tables()
@ -268,103 +331,45 @@ static bool open_and_lock_table_for_truncate(THD *thd, TABLE_LIST *table_ref,
table_ref->table_name, FALSE)))
DBUG_RETURN(TRUE);
table_type= table->s->db_type();
*hton_can_recreate= ha_check_storage_engine_flag(table_type,
*hton_can_recreate= ha_check_storage_engine_flag(table->s->db_type(),
HTON_CAN_RECREATE);
table_ref->mdl_request.ticket= table->mdl_ticket;
}
else
{
/*
Even though we could use the previous execution branch here just as
well, we must not try to open the table:
*/
/* Acquire an exclusive lock. */
DBUG_ASSERT(table_ref->next_global == NULL);
if (lock_table_names(thd, table_ref, NULL,
thd->variables.lock_wait_timeout,
MYSQL_OPEN_SKIP_TEMPORARY))
DBUG_RETURN(TRUE);
if (dd_frm_storage_engine(thd, table_ref->db, table_ref->table_name,
&table_type))
if (dd_check_storage_engine_flag(thd, table_ref->db, table_ref->table_name,
HTON_CAN_RECREATE, hton_can_recreate))
DBUG_RETURN(TRUE);
*hton_can_recreate= ha_check_storage_engine_flag(table_type,
HTON_CAN_RECREATE);
}
#ifdef WITH_PARTITION_STORAGE_ENGINE
/*
TODO: Add support for TRUNCATE PARTITION for NDB and other engines
supporting native partitioning.
A storage engine can recreate or truncate the table only if there
are no references to it from anywhere, i.e. no cached TABLE in the
table cache.
*/
if (thd->lex->alter_info.flags & ALTER_ADMIN_PARTITION &&
table_type != partition_hton)
if (thd->locked_tables_mode)
{
my_error(ER_PARTITION_MGMT_ON_NONPARTITIONED, MYF(0));
DBUG_RETURN(TRUE);
}
#endif
DEBUG_SYNC(thd, "lock_table_for_truncate");
if (*hton_can_recreate)
{
/*
Acquire an exclusive lock. The storage engine can recreate the
table only if there are no references to it from anywhere, i.e.
no cached TABLE in the table cache. To remove the table from the
cache we need an exclusive lock.
*/
if (thd->locked_tables_mode)
{
if (wait_while_table_is_used(thd, table, HA_EXTRA_FORCE_REOPEN))
DBUG_RETURN(TRUE);
*ticket_downgrade= table->mdl_ticket;
DEBUG_SYNC(thd, "upgrade_lock_for_truncate");
/* To remove the table from the cache we need an exclusive lock. */
if (wait_while_table_is_used(thd, table, HA_EXTRA_FORCE_REOPEN))
DBUG_RETURN(TRUE);
m_ticket_downgrade= table->mdl_ticket;
/* Close if table is going to be recreated. */
if (*hton_can_recreate)
close_all_tables_for_name(thd, table->s, FALSE);
}
else
{
ulong timeout= thd->variables.lock_wait_timeout;
if (thd->mdl_context.
upgrade_shared_lock_to_exclusive(table_ref->mdl_request.ticket,
timeout))
DBUG_RETURN(TRUE);
tdc_remove_table(thd, TDC_RT_REMOVE_ALL, table_ref->db,
table_ref->table_name, FALSE);
}
}
else
{
/*
Can't recreate, we must mechanically delete all rows in
the table. Our metadata lock guarantees that no transaction
is reading or writing into the table. Yet, to open a write
cursor we need a thr_lock lock. Use open_and_lock_tables()
to do the necessary job.
*/
/* Allow to open base tables only. */
table_ref->required_type= FRMTYPE_TABLE;
/* We don't need to load triggers. */
DBUG_ASSERT(table_ref->trg_event_map == 0);
/*
Even though we have an MDL lock on the table here, we don't
pass MYSQL_OPEN_HAS_MDL_LOCK to open_and_lock_tables
since to truncate a MERGE table, we must open and lock
merge children, and on those we don't have an MDL lock.
Thus clear the ticket to satisfy MDL asserts.
*/
table_ref->mdl_request.ticket= NULL;
/*
Open the table as it will handle some required preparations.
Ignore pending FLUSH TABLES since we don't want to release
the MDL lock taken above and otherwise there is no way to
wait for FLUSH TABLES in deadlock-free fashion.
*/
if (open_and_lock_tables(thd, table_ref, FALSE,
MYSQL_OPEN_IGNORE_FLUSH |
MYSQL_OPEN_SKIP_TEMPORARY))
DBUG_RETURN(TRUE);
/* Table is already locked exclusively. Remove cached instances. */
tdc_remove_table(thd, TDC_RT_REMOVE_ALL, table_ref->db,
table_ref->table_name, FALSE);
}
DBUG_RETURN(FALSE);
@ -385,14 +390,17 @@ static bool open_and_lock_table_for_truncate(THD *thd, TABLE_LIST *table_ref,
@retval TRUE Error.
*/
bool mysql_truncate_table(THD *thd, TABLE_LIST *table_ref)
bool Truncate_statement::truncate_table(THD *thd, TABLE_LIST *table_ref)
{
int error;
TABLE *table;
bool error= TRUE, binlog_stmt;
MDL_ticket *mdl_ticket= NULL;
DBUG_ENTER("mysql_truncate_table");
bool binlog_stmt;
DBUG_ENTER("Truncate_statement::truncate_table");
/* Remove tables from the HANDLER's hash. */
/* Initialize, or reinitialize in case of reexecution (SP). */
m_ticket_downgrade= NULL;
/* Remove table from the HANDLER's hash. */
mysql_ha_rm_tables(thd, table_ref);
/* If it is a temporary table, no need to take locks. */
@ -413,14 +421,11 @@ bool mysql_truncate_table(THD *thd, TABLE_LIST *table_ref)
{
/*
The engine does not support truncate-by-recreate. Open the
table and delete all rows. In such a manner this can in fact
open several tables if it's a temporary MyISAMMRG table.
table and invoke the handler truncate. In such a manner this
can in fact open several tables if it's a temporary MyISAMMRG
table.
*/
if (open_and_lock_tables(thd, table_ref, FALSE,
MYSQL_OPEN_TEMPORARY_ONLY))
DBUG_RETURN(TRUE);
error= delete_all_rows(thd, table_ref->table);
error= handler_truncate(thd, table_ref, TRUE);
}
/*
@ -434,8 +439,7 @@ bool mysql_truncate_table(THD *thd, TABLE_LIST *table_ref)
{
bool hton_can_recreate;
if (open_and_lock_table_for_truncate(thd, table_ref,
&hton_can_recreate, &mdl_ticket))
if (lock_table(thd, table_ref, &hton_can_recreate))
DBUG_RETURN(TRUE);
if (hton_can_recreate)
@ -454,13 +458,18 @@ bool mysql_truncate_table(THD *thd, TABLE_LIST *table_ref)
}
else
{
error= delete_all_rows(thd, table_ref->table);
/*
The engine does not support truncate-by-recreate.
Attempt to use the handler truncate method.
*/
error= handler_truncate(thd, table_ref, FALSE);
/*
Regardless of the error status, the query must be written to the
binary log if rows of a non-transactional table were deleted.
All effects of a TRUNCATE TABLE operation are committed even if
truncation fails. Thus, the query must be written to the binary
log. The only exception is a unimplemented truncate method.
*/
binlog_stmt= !error || thd->transaction.stmt.modified_non_trans_table;
binlog_stmt= !error || error != HA_ERR_WRONG_COMMAND;
}
query_cache_invalidate3(thd, table_ref, FALSE);
@ -470,50 +479,38 @@ bool mysql_truncate_table(THD *thd, TABLE_LIST *table_ref)
if (binlog_stmt)
error|= write_bin_log(thd, !error, thd->query(), thd->query_length());
/*
All effects of a TRUNCATE TABLE operation are rolled back if a row
by row deletion fails. Otherwise, it is automatically committed at
the end.
*/
if (error)
{
trans_rollback_stmt(thd);
trans_rollback(thd);
}
/*
A locked table ticket was upgraded to a exclusive lock. After the
the query has been written to the binary log, downgrade the lock
to a shared one.
*/
if (mdl_ticket)
mdl_ticket->downgrade_exclusive_lock(MDL_SHARED_NO_READ_WRITE);
if (m_ticket_downgrade)
m_ticket_downgrade->downgrade_exclusive_lock(MDL_SHARED_NO_READ_WRITE);
DBUG_PRINT("exit", ("error: %d", error));
DBUG_RETURN(test(error));
DBUG_RETURN(error);
}
/**
Execute a TRUNCATE statement at runtime.
@param thd The current thread.
@return FALSE on success.
*/
bool Truncate_statement::execute(THD *thd)
{
TABLE_LIST *first_table= thd->lex->select_lex.table_list.first;
bool res= TRUE;
TABLE_LIST *first_table= thd->lex->select_lex.table_list.first;
DBUG_ENTER("Truncate_statement::execute");
if (check_one_table_access(thd, DROP_ACL, first_table))
goto error;
/*
Don't allow this within a transaction because we want to use
re-generate table
*/
if (thd->in_active_multi_stmt_transaction())
{
my_message(ER_LOCK_OR_ACTIVE_TRANSACTION,
ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0));
goto error;
}
if (! (res= mysql_truncate_table(thd, first_table)))
DBUG_RETURN(res);
if (! (res= truncate_table(thd, first_table)))
my_ok(thd);
error:
DBUG_RETURN(res);
}

23
sql/sql_truncate.h
View file

@ -18,13 +18,15 @@
class THD;
struct TABLE_LIST;
bool mysql_truncate_table(THD *thd, TABLE_LIST *table_ref);
/**
Truncate_statement represents the TRUNCATE statement.
*/
class Truncate_statement : public Sql_statement
{
private:
/* Set if a lock must be downgraded after truncate is done. */
MDL_ticket *m_ticket_downgrade;
public:
/**
Constructor, used to represent a ALTER TABLE statement.
@ -34,7 +36,7 @@ public:
: Sql_statement(lex)
{}
~Truncate_statement()
virtual ~Truncate_statement()
{}
/**
@ -43,7 +45,20 @@ public:
@return false on success.
*/
bool execute(THD *thd);
protected:
/** Handle locking a base table for truncate. */
bool lock_table(THD *, TABLE_LIST *, bool *);
/** Truncate table via the handler method. */
int handler_truncate(THD *, TABLE_LIST *, bool);
/**
Optimized delete of all rows by doing a full regenerate of the table.
Depending on the storage engine, it can be accomplished through a
drop and recreate or via the handler truncate method.
*/
bool truncate_table(THD *, TABLE_LIST *);
};
#endif

2
sql/sql_yacc.yy
View file

@ -10770,7 +10770,7 @@ truncate:
lex->select_lex.sql_cache= SELECT_LEX::SQL_CACHE_UNSPECIFIED;
lex->select_lex.init_order();
YYPS->m_lock_type= TL_WRITE;
YYPS->m_mdl_type= MDL_SHARED_NO_READ_WRITE;
YYPS->m_mdl_type= MDL_EXCLUSIVE;
}
table_name
{

4
sql/table.h
View file

@ -1170,7 +1170,9 @@ enum enum_schema_table_state
typedef struct st_foreign_key_info
{
LEX_STRING *forein_id;
LEX_STRING *foreign_id;
LEX_STRING *foreign_db;
LEX_STRING *foreign_table;
LEX_STRING *referenced_db;
LEX_STRING *referenced_table;
LEX_STRING *update_method;

4
storage/archive/ha_archive.cc
View file

@ -1650,9 +1650,9 @@ int ha_archive::end_bulk_insert()
This is done for security reasons. In a later version we will enable this by
allowing the user to select a different row format.
*/
int ha_archive::delete_all_rows()
int ha_archive::truncate()
{
DBUG_ENTER("ha_archive::delete_all_rows");
DBUG_ENTER("ha_archive::truncate");
DBUG_RETURN(HA_ERR_WRONG_COMMAND);
}

2
storage/archive/ha_archive.h
View file

@ -115,7 +115,7 @@ public:
int close(void);
int write_row(uchar * buf);
int real_write_row(uchar *buf, azio_stream *writer);
int delete_all_rows();
int truncate();
int rnd_init(bool scan=1);
int rnd_next(uchar *buf);
int rnd_pos(uchar * buf, uchar *pos);

10
storage/blackhole/ha_blackhole.cc
View file

@ -87,6 +87,16 @@ int ha_blackhole::create(const char *name, TABLE *table_arg,
DBUG_RETURN(0);
}
/*
Intended to support partitioning.
Allows a particular partition to be truncated.
*/
int ha_blackhole::truncate()
{
DBUG_ENTER("ha_blackhole::truncate");
DBUG_RETURN(0);
}
const char *ha_blackhole::index_type(uint key_number)
{
DBUG_ENTER("ha_blackhole::index_type");

1
storage/blackhole/ha_blackhole.h
View file

@ -76,6 +76,7 @@ public:
uint max_supported_key_part_length() const { return BLACKHOLE_MAX_KEY_LENGTH; }
int open(const char *name, int mode, uint test_if_locked);
int close(void);
int truncate();
int rnd_init(bool scan);
int rnd_next(uchar *buf);
int rnd_pos(uchar * buf, uchar *pos);

93
storage/example/ha_example.cc
View file

@ -356,14 +356,14 @@ int ha_example::close(void)
is happening. buf() is a byte array of data. You can use the field
information to extract the data from the native byte array type.
@details
@details
Example of this would be:
@code
@code
for (Field **field=table->field ; *field ; field++)
{
...
}
@endcode
@endcode
See ha_tina.cc for an example of extracting all of the data as strings.
ha_berekly.cc has an example of how to store it intact by "packing" it
@ -375,7 +375,7 @@ int ha_example::close(void)
Called from item_sum.cc, item_sum.cc, sql_acl.cc, sql_insert.cc,
sql_insert.cc, sql_select.cc, sql_table.cc, sql_udf.cc, and sql_update.cc.
@see
@see
item_sum.cc, item_sum.cc, sql_acl.cc, sql_insert.cc,
sql_insert.cc, sql_select.cc, sql_table.cc, sql_udf.cc and sql_update.cc
*/
@ -400,19 +400,19 @@ int ha_example::write_row(uchar *buf)
Keep in mind that the server can do updates based on ordering if an ORDER BY
clause was used. Consecutive ordering is not guaranteed.
@details
@details
Currently new_data will not have an updated auto_increament record, or
and updated timestamp field. You can do these for example by doing:
@code
@code
if (table->timestamp_field_type & TIMESTAMP_AUTO_SET_ON_UPDATE)
table->timestamp_field->set_time();
if (table->next_number_field && record == table->record[0])
update_auto_increment();
@endcode
@endcode
Called from sql_select.cc, sql_acl.cc, sql_update.cc, and sql_insert.cc.
@see
@see
sql_select.cc, sql_acl.cc, sql_update.cc and sql_insert.cc
*/
int ha_example::update_row(const uchar *old_data, uchar *new_data)
@ -507,10 +507,10 @@ int ha_example::index_prev(uchar *buf)
@brief
index_first() asks for the first key in the index.
@details
@details
Called from opt_range.cc, opt_sum.cc, sql_handler.cc, and sql_select.cc.
@see
@see
opt_range.cc, opt_sum.cc, sql_handler.cc and sql_select.cc
*/
int ha_example::index_first(uchar *buf)
@ -528,10 +528,10 @@ int ha_example::index_first(uchar *buf)
@brief
index_last() asks for the last key in the index.
@details
@details
Called from opt_range.cc, opt_sum.cc, sql_handler.cc, and sql_select.cc.
@see
@see
opt_range.cc, opt_sum.cc, sql_handler.cc and sql_select.cc
*/
int ha_example::index_last(uchar *buf)
@ -551,11 +551,11 @@ int ha_example::index_last(uchar *buf)
scan. See the example in the introduction at the top of this file to see when
rnd_init() is called.
@details
@details
Called from filesort.cc, records.cc, sql_handler.cc, sql_select.cc, sql_table.cc,
and sql_update.cc.
@see
@see
filesort.cc, records.cc, sql_handler.cc, sql_select.cc, sql_table.cc and sql_update.cc
*/
int ha_example::rnd_init(bool scan)
@ -578,11 +578,11 @@ int ha_example::rnd_end()
The Field structure for the table is the key to getting data into buf
in a manner that will allow the server to understand it.
@details
@details
Called from filesort.cc, records.cc, sql_handler.cc, sql_select.cc, sql_table.cc,
and sql_update.cc.
@see
@see
filesort.cc, records.cc, sql_handler.cc, sql_select.cc, sql_table.cc and sql_update.cc
*/
int ha_example::rnd_next(uchar *buf)
@ -602,11 +602,11 @@ int ha_example::rnd_next(uchar *buf)
position() is called after each call to rnd_next() if the data needs
to be ordered. You can do something like the following to store
the position:
@code
@code
my_store_ptr(ref, ref_length, current_position);
@endcode
@endcode
@details
@details
The server uses ref to store data. ref_length in the above case is
the size needed to store current_position. ref is just a byte array
that the server will maintain. If you are using offsets to mark rows, then
@ -615,7 +615,7 @@ int ha_example::rnd_next(uchar *buf)
Called from filesort.cc, sql_select.cc, sql_delete.cc, and sql_update.cc.
@see
@see
filesort.cc, sql_select.cc, sql_delete.cc and sql_update.cc
*/
void ha_example::position(const uchar *record)
@ -632,10 +632,10 @@ void ha_example::position(const uchar *record)
ref. You can use ha_get_ptr(pos,ref_length) to retrieve whatever key
or position you saved when position() was called.
@details
@details
Called from filesort.cc, records.cc, sql_insert.cc, sql_select.cc, and sql_update.cc.
@see
@see
filesort.cc, records.cc, sql_insert.cc, sql_select.cc and sql_update.cc
*/
int ha_example::rnd_pos(uchar *buf, uchar *pos)
@ -655,15 +655,15 @@ int ha_example::rnd_pos(uchar *buf, uchar *pos)
::info() is used to return information to the optimizer. See my_base.h for
the complete description.
@details
@details
Currently this table handler doesn't implement most of the fields really needed.
SHOW also makes use of this data.
You will probably want to have the following in your code:
@code
@code
if (records < 2)
records = 2;
@endcode
@endcode
The reason is that the server will optimize for cases of only a single
record. If, in a table scan, you don't know the number of records, it
will probably be better to set records to two so you can return as many
@ -682,7 +682,7 @@ int ha_example::rnd_pos(uchar *buf, uchar *pos)
sql_select.cc, sql_select.cc, sql_show.cc, sql_show.cc, sql_show.cc, sql_show.cc,
sql_table.cc, sql_union.cc, and sql_update.cc.
@see
@see
filesort.cc, ha_heap.cc, item_sum.cc, opt_sum.cc, sql_delete.cc, sql_delete.cc,
sql_derived.cc, sql_select.cc, sql_select.cc, sql_select.cc, sql_select.cc,
sql_select.cc, sql_show.cc, sql_show.cc, sql_show.cc, sql_show.cc, sql_table.cc,
@ -716,14 +716,14 @@ int ha_example::extra(enum ha_extra_function operation)
Used to delete all rows in a table, including cases of truncate and cases where
the optimizer realizes that all rows will be removed as a result of an SQL statement.
@details
@details
Called from item_sum.cc by Item_func_group_concat::clear(),
Item_sum_count_distinct::clear(), and Item_func_group_concat::clear().
Called from sql_delete.cc by mysql_delete().
Called from sql_select.cc by JOIN::reinit().
Called from sql_union.cc by st_select_lex_unit::exec().
@see
@see
Item_func_group_concat::clear(), Item_sum_count_distinct::clear() and
Item_func_group_concat::clear() in item_sum.cc;
mysql_delete() in sql_delete.cc;
@ -737,6 +737,29 @@ int ha_example::delete_all_rows()
}
/**
@brief
Used for handler specific truncate table. The table is locked in
exclusive mode and handler is responsible for reseting the auto-
increment counter.
@details
Called from Truncate_statement::handler_truncate.
Not used if the handlerton supports HTON_CAN_RECREATE, unless this
engine can be used as a partition. In this case, it is invoked when
a particular partition is to be truncated.
@see
Truncate_statement in sql_truncate.cc
Remarks in handler::truncate.
*/
int ha_example::truncate()
{
DBUG_ENTER("ha_example::truncate");
DBUG_RETURN(HA_ERR_WRONG_COMMAND);
}
/**
@brief
This create a lock on the table. If you are implementing a storage engine
@ -745,11 +768,11 @@ int ha_example::delete_all_rows()
here. Hint: Read the section "locking functions for mysql" in lock.cc to understand
this.
@details
@details
Called from lock.cc by lock_external() and unlock_external(). Also called
from sql_table.cc by copy_data_between_tables().
@see
@see
lock.cc by lock_external() and unlock_external() in lock.cc;
the section "locking functions for mysql" in lock.cc;
copy_data_between_tables() in sql_table.cc.
@ -767,7 +790,7 @@ int ha_example::external_lock(THD *thd, int lock_type)
should be needed for the table. For updates/deletes/inserts we get WRITE
locks, for SELECT... we get read locks.
@details
@details
Before adding the lock into the table lock handler (see thr_lock.c),
mysqld calls store lock with the requested locks. Store lock can now
modify a write lock to a read lock (or some other lock), ignore the
@ -790,12 +813,12 @@ int ha_example::external_lock(THD *thd, int lock_type)
Called from lock.cc by get_lock_data().
@note
@note
In this method one should NEVER rely on table->in_use, it may, in fact,
refer to a different thread! (this happens if get_lock_data() is called
from mysql_lock_abort_for_thread() function)
@see
@see
get_lock_data() in lock.cc
*/
THR_LOCK_DATA **ha_example::store_lock(THD *thd,
@ -816,7 +839,7 @@ THR_LOCK_DATA **ha_example::store_lock(THD *thd,
shared references released). The variable name will just be the name of
the table. You will need to remove any files you have created at this point.
@details
@details
If you do not implement this, the default delete_table() is called from
handler.cc and it will delete all files with the file extensions returned
by bas_ext().
@ -825,7 +848,7 @@ THR_LOCK_DATA **ha_example::store_lock(THD *thd,
during create if the table_flag HA_DROP_BEFORE_CREATE was specified for
the storage engine.
@see
@see
delete_table and ha_create_table() in handler.cc
*/
int ha_example::delete_table(const char *name)

1
storage/example/ha_example.h
View file

@ -245,6 +245,7 @@ public:
int extra(enum ha_extra_function operation);
int external_lock(THD *thd, int lock_type); ///< required
int delete_all_rows(void);
int truncate();
ha_rows records_in_range(uint inx, key_range *min_key,
key_range *max_key);
int delete_table(const char *from);

10
storage/federated/ha_federated.cc
View file

@ -3041,6 +3041,16 @@ int ha_federated::delete_all_rows()
}
/*
Used to manually truncate the table via a delete of all rows in a table.
*/
int ha_federated::truncate()
{
return delete_all_rows();
}
/*
The idea with handler::store_lock() is the following:

1
storage/federated/ha_federated.h
View file

@ -248,6 +248,7 @@ public:
int optimize(THD* thd, HA_CHECK_OPT* check_opt);
int delete_all_rows(void);
int truncate();
int create(const char *name, TABLE *form,
HA_CREATE_INFO *create_info); //required
ha_rows records_in_range(uint inx, key_range *start_key,

7
storage/heap/ha_heap.cc
View file

@ -455,6 +455,13 @@ int ha_heap::delete_all_rows()
}
int ha_heap::truncate()
{
int error= delete_all_rows();
return error ? error : reset_auto_increment(0);
}
int ha_heap::reset_auto_increment(ulonglong value)
{
file->s->auto_increment= value;

1
storage/heap/ha_heap.h
View file

@ -99,6 +99,7 @@ public:
int reset();
int external_lock(THD *thd, int lock_type);
int delete_all_rows(void);
int truncate();
int reset_auto_increment(ulonglong value);
int disable_indexes(uint mode);
int enable_indexes(uint mode);

4
storage/ibmdb2i/db2i_constraints.cc
View file

@ -494,10 +494,10 @@ int ha_ibmdb2i::get_foreign_key_list(THD *thd, List<FOREIGN_KEY_INFO> *f_key_lis
convFromEbcdic(FKCstDef->CstName.Name, convName,FKCstDef->CstName.Len);
if (convName[0] == '"') // If quoted, exclude quotes.
f_key_info.forein_id = thd_make_lex_string(thd, 0,
f_key_info.foreign_id = thd_make_lex_string(thd, 0,
convName + 1, (uint) (FKCstDef->CstName.Len - 2), 1);
else // Not quoted
f_key_info.forein_id = thd_make_lex_string(thd, 0,
f_key_info.foreign_id = thd_make_lex_string(thd, 0,
convName, (uint) FKCstDef->CstName.Len, 1);
/* Process the names of the foreign keys. */

7
storage/ibmdb2i/ha_ibmdb2i.cc
View file

@ -1806,6 +1806,13 @@ int ha_ibmdb2i::delete_all_rows()
}
int ha_ibmdb2i::truncate()
{
int error = delete_all_rows();
return error ? error : reset_auto_increment(0);
}
int ha_ibmdb2i::external_lock(THD *thd, int lock_type)
{
int rc = 0;

311
storage/innobase/handler/ha_innodb.cc
View file

@ -7081,33 +7081,21 @@ Deletes all rows of an InnoDB table.
@return error number */
UNIV_INTERN
int
ha_innobase::delete_all_rows(void)
ha_innobase::truncate(void)
/*==============================*/
{
int error;
DBUG_ENTER("ha_innobase::delete_all_rows");
DBUG_ENTER("ha_innobase::truncate");
/* Get the transaction associated with the current thd, or create one
if not yet created, and update prebuilt->trx */
update_thd(ha_thd());
if (thd_sql_command(user_thd) != SQLCOM_TRUNCATE) {
fallback:
/* We only handle TRUNCATE TABLE t as a special case.
DELETE FROM t will have to use ha_innobase::delete_row(),
because DELETE is transactional while TRUNCATE is not. */
DBUG_RETURN(my_errno=HA_ERR_WRONG_COMMAND);
}
/* Truncate the table in InnoDB */
error = row_truncate_table_for_mysql(prebuilt->table, prebuilt->trx);
if (error == DB_ERROR) {
/* Cannot truncate; resort to ha_innobase::delete_row() */
goto fallback;
}
error = convert_error_code_to_mysql(error, prebuilt->table->flags,
NULL);
@ -8315,136 +8303,199 @@ ha_innobase::get_foreign_key_create_info(void)
}
/***********************************************************************//**
Maps a InnoDB foreign key constraint to a equivalent MySQL foreign key info.
@return pointer to foreign key info */
static
FOREIGN_KEY_INFO*
get_foreign_key_info(
/*=================*/
THD* thd, /*!< in: user thread handle */
dict_foreign_t* foreign) /*!< in: foreign key constraint */
{
FOREIGN_KEY_INFO f_key_info;
FOREIGN_KEY_INFO* pf_key_info;
uint i = 0;
ulint len;
char tmp_buff[NAME_LEN+1];
char name_buff[NAME_LEN+1];
const char* ptr;
LEX_STRING* referenced_key_name;
LEX_STRING* name = NULL;
ptr = dict_remove_db_name(foreign->id);
f_key_info.foreign_id = thd_make_lex_string(thd, 0, ptr,
(uint) strlen(ptr), 1);
/* Name format: database name, '/', table name, '\0' */
/* Referenced (parent) database name */
len = dict_get_db_name_len(foreign->referenced_table_name);
ut_a(len < sizeof(tmp_buff));
ut_memcpy(tmp_buff, foreign->referenced_table_name, len);
tmp_buff[len] = 0;
len = filename_to_tablename(tmp_buff, name_buff, sizeof(name_buff));
f_key_info.referenced_db = thd_make_lex_string(thd, 0, name_buff, len, 1);
/* Referenced (parent) table name */
ptr = dict_remove_db_name(foreign->referenced_table_name);
len = filename_to_tablename(ptr, name_buff, sizeof(name));
f_key_info.referenced_table = thd_make_lex_string(thd, 0, name_buff, len, 1);
/* Dependent (child) database name */
len = dict_get_db_name_len(foreign->foreign_table_name);
ut_a(len < sizeof(tmp_buff));
ut_memcpy(tmp_buff, foreign->foreign_table_name, len);
tmp_buff[len] = 0;
len = filename_to_tablename(tmp_buff, name_buff, sizeof(name_buff));
f_key_info.foreign_db = thd_make_lex_string(thd, 0, name_buff, len, 1);
/* Dependent (child) table name */
ptr = dict_remove_db_name(foreign->foreign_table_name);
len = filename_to_tablename(ptr, name_buff, sizeof(name_buff));
f_key_info.foreign_table = thd_make_lex_string(thd, 0, name_buff, len, 1);
do {
ptr = foreign->foreign_col_names[i];
name = thd_make_lex_string(thd, name, ptr,
(uint) strlen(ptr), 1);
f_key_info.foreign_fields.push_back(name);
ptr = foreign->referenced_col_names[i];
name = thd_make_lex_string(thd, name, ptr,
(uint) strlen(ptr), 1);
f_key_info.referenced_fields.push_back(name);
} while (++i < foreign->n_fields);
if (foreign->type & DICT_FOREIGN_ON_DELETE_CASCADE) {
len = 7;
ptr = "CASCADE";
} else if (foreign->type & DICT_FOREIGN_ON_DELETE_SET_NULL) {
len = 8;
ptr = "SET NULL";
} else if (foreign->type & DICT_FOREIGN_ON_DELETE_NO_ACTION) {
len = 9;
ptr = "NO ACTION";
} else {
len = 8;
ptr = "RESTRICT";
}
f_key_info.delete_method = thd_make_lex_string(thd,
f_key_info.delete_method,
ptr, len, 1);
if (foreign->type & DICT_FOREIGN_ON_UPDATE_CASCADE) {
len = 7;
ptr = "CASCADE";
} else if (foreign->type & DICT_FOREIGN_ON_UPDATE_SET_NULL) {
len = 8;
ptr = "SET NULL";
} else if (foreign->type & DICT_FOREIGN_ON_UPDATE_NO_ACTION) {
len = 9;
ptr = "NO ACTION";
} else {
len = 8;
ptr = "RESTRICT";
}
f_key_info.update_method = thd_make_lex_string(thd,
f_key_info.update_method,
ptr, len, 1);
if (foreign->referenced_index && foreign->referenced_index->name) {
referenced_key_name = thd_make_lex_string(thd,
f_key_info.referenced_key_name,
foreign->referenced_index->name,
(uint) strlen(foreign->referenced_index->name),
1);
} else {
referenced_key_name = NULL;
}
f_key_info.referenced_key_name = referenced_key_name;
pf_key_info = (FOREIGN_KEY_INFO *) thd_memdup(thd, &f_key_info,
sizeof(FOREIGN_KEY_INFO));
return(pf_key_info);
}
/*******************************************************************//**
Gets the list of foreign keys in this table.
@return always 0, that is, always succeeds */
UNIV_INTERN
int
ha_innobase::get_foreign_key_list(THD *thd, List<FOREIGN_KEY_INFO> *f_key_list)
ha_innobase::get_foreign_key_list(
/*==============================*/
THD* thd, /*!< in: user thread handle */
List<FOREIGN_KEY_INFO>* f_key_list) /*!< out: foreign key list */
{
dict_foreign_t* foreign;
FOREIGN_KEY_INFO* pf_key_info;
dict_foreign_t* foreign;
DBUG_ENTER("get_foreign_key_list");
ut_a(prebuilt != NULL);
update_thd(ha_thd());
prebuilt->trx->op_info = (char*)"getting list of foreign keys";
trx_search_latch_release_if_reserved(prebuilt->trx);
mutex_enter(&(dict_sys->mutex));
foreign = UT_LIST_GET_FIRST(prebuilt->table->foreign_list);
ut_a(prebuilt != NULL);
update_thd(ha_thd());
while (foreign != NULL) {
uint i;
FOREIGN_KEY_INFO f_key_info;
LEX_STRING *name= 0;
uint ulen;
char uname[NAME_LEN+1]; /* Unencoded name */
char db_name[NAME_LEN+1];
const char *tmp_buff;
prebuilt->trx->op_info = "getting list of foreign keys";
tmp_buff= foreign->id;
i= 0;
while (tmp_buff[i] != '/')
i++;
tmp_buff+= i + 1;
f_key_info.forein_id = thd_make_lex_string(thd, 0,
tmp_buff, (uint) strlen(tmp_buff), 1);
tmp_buff= foreign->referenced_table_name;
trx_search_latch_release_if_reserved(prebuilt->trx);
/* Database name */
i= 0;
while (tmp_buff[i] != '/')
{
db_name[i]= tmp_buff[i];
i++;
}
db_name[i]= 0;
ulen= filename_to_tablename(db_name, uname, sizeof(uname));
f_key_info.referenced_db = thd_make_lex_string(thd, 0,
uname, ulen, 1);
mutex_enter(&(dict_sys->mutex));
/* Table name */
tmp_buff+= i + 1;
ulen= filename_to_tablename(tmp_buff, uname, sizeof(uname));
f_key_info.referenced_table = thd_make_lex_string(thd, 0,
uname, ulen, 1);
for (foreign = UT_LIST_GET_FIRST(prebuilt->table->foreign_list);
foreign != NULL;
foreign = UT_LIST_GET_NEXT(referenced_list, foreign)) {
pf_key_info = get_foreign_key_info(thd, foreign);
if (pf_key_info) {
f_key_list->push_back(pf_key_info);
}
}
for (i= 0;;) {
tmp_buff= foreign->foreign_col_names[i];
name = thd_make_lex_string(thd, name,
tmp_buff, (uint) strlen(tmp_buff), 1);
f_key_info.foreign_fields.push_back(name);
tmp_buff= foreign->referenced_col_names[i];
name = thd_make_lex_string(thd, name,
tmp_buff, (uint) strlen(tmp_buff), 1);
f_key_info.referenced_fields.push_back(name);
if (++i >= foreign->n_fields)
break;
}
mutex_exit(&(dict_sys->mutex));
ulong length;
if (foreign->type & DICT_FOREIGN_ON_DELETE_CASCADE)
{
length=7;
tmp_buff= "CASCADE";
}
else if (foreign->type & DICT_FOREIGN_ON_DELETE_SET_NULL)
{
length=8;
tmp_buff= "SET NULL";
}
else if (foreign->type & DICT_FOREIGN_ON_DELETE_NO_ACTION)
{
length=9;
tmp_buff= "NO ACTION";
}
else
{
length=8;
tmp_buff= "RESTRICT";
}
f_key_info.delete_method = thd_make_lex_string(
thd, f_key_info.delete_method, tmp_buff, length, 1);
prebuilt->trx->op_info = "";
return(0);
}
if (foreign->type & DICT_FOREIGN_ON_UPDATE_CASCADE)
{
length=7;
tmp_buff= "CASCADE";
}
else if (foreign->type & DICT_FOREIGN_ON_UPDATE_SET_NULL)
{
length=8;
tmp_buff= "SET NULL";
}
else if (foreign->type & DICT_FOREIGN_ON_UPDATE_NO_ACTION)
{
length=9;
tmp_buff= "NO ACTION";
}
else
{
length=8;
tmp_buff= "RESTRICT";
}
f_key_info.update_method = thd_make_lex_string(
thd, f_key_info.update_method, tmp_buff, length, 1);
if (foreign->referenced_index &&
foreign->referenced_index->name)
{
f_key_info.referenced_key_name = thd_make_lex_string(
thd, f_key_info.referenced_key_name,
foreign->referenced_index->name,
(uint) strlen(foreign->referenced_index->name), 1);
}
else
f_key_info.referenced_key_name= 0;
/*******************************************************************//**
Gets the set of foreign keys where this table is the referenced table.
@return always 0, that is, always succeeds */
UNIV_INTERN
int
ha_innobase::get_parent_foreign_key_list(
/*=====================================*/
THD* thd, /*!< in: user thread handle */
List<FOREIGN_KEY_INFO>* f_key_list) /*!< out: foreign key list */
{
FOREIGN_KEY_INFO* pf_key_info;
dict_foreign_t* foreign;
FOREIGN_KEY_INFO *pf_key_info = (FOREIGN_KEY_INFO *)
thd_memdup(thd, &f_key_info, sizeof(FOREIGN_KEY_INFO));
f_key_list->push_back(pf_key_info);
foreign = UT_LIST_GET_NEXT(foreign_list, foreign);
}
mutex_exit(&(dict_sys->mutex));
prebuilt->trx->op_info = (char*)"";
ut_a(prebuilt != NULL);
update_thd(ha_thd());
DBUG_RETURN(0);
prebuilt->trx->op_info = "getting list of referencing foreign keys";
trx_search_latch_release_if_reserved(prebuilt->trx);
mutex_enter(&(dict_sys->mutex));
for (foreign = UT_LIST_GET_FIRST(prebuilt->table->referenced_list);
foreign != NULL;
foreign = UT_LIST_GET_NEXT(referenced_list, foreign)) {
pf_key_info = get_foreign_key_info(thd, foreign);
if (pf_key_info) {
f_key_list->push_back(pf_key_info);
}
}
mutex_exit(&(dict_sys->mutex));
prebuilt->trx->op_info = "";
return(0);
}
/*****************************************************************//**

4
storage/innobase/handler/ha_innodb.h
View file

@ -178,13 +178,15 @@ class ha_innobase: public handler
void update_create_info(HA_CREATE_INFO* create_info);
int create(const char *name, register TABLE *form,
HA_CREATE_INFO *create_info);
int delete_all_rows();
int truncate();
int delete_table(const char *name);
int rename_table(const char* from, const char* to);
int check(THD* thd, HA_CHECK_OPT* check_opt);
char* update_table_comment(const char* comment);
char* get_foreign_key_create_info();
int get_foreign_key_list(THD *thd, List<FOREIGN_KEY_INFO> *f_key_list);
int get_parent_foreign_key_list(THD *thd,
List<FOREIGN_KEY_INFO> *f_key_list);
bool can_switch_engines();
uint referenced_by_foreign_key();
void free_foreign_key_create_info(char* str);

3
storage/innobase/row/row0mysql.c
View file

@ -2985,8 +2985,7 @@ next_rec:
dict_table_change_id_in_cache(table, new_id);
}
/* MySQL calls ha_innobase::reset_auto_increment() which does
the same thing. */
/* Reset auto-increment. */
dict_table_autoinc_lock(table);
dict_table_autoinc_initialize(table, 1);
dict_table_autoinc_unlock(table);

12
storage/myisam/ha_myisam.cc
View file

@ -1788,6 +1788,18 @@ int ha_myisam::delete_all_rows()
return mi_delete_all_rows(file);
}
/*
Intended to support partitioning.
Allows a particular partition to be truncated.
*/
int ha_myisam::truncate()
{
int error= delete_all_rows();
return error ? error : reset_auto_increment(0);
}
int ha_myisam::reset_auto_increment(ulonglong value)
{
file->s->state.auto_increment= value;

1
storage/myisam/ha_myisam.h
View file

@ -107,6 +107,7 @@ class ha_myisam: public handler
int reset(void);
int external_lock(THD *thd, int lock_type);
int delete_all_rows(void);
int truncate();
int reset_auto_increment(ulonglong value);
int disable_indexes(uint mode);
int enable_indexes(uint mode);

16
storage/myisammrg/ha_myisammrg.cc
View file

@ -1226,6 +1226,22 @@ ha_rows ha_myisammrg::records_in_range(uint inx, key_range *min_key,
}
int ha_myisammrg::truncate()
{
int err= 0;
MYRG_TABLE *table;
DBUG_ENTER("ha_myisammrg::truncate");
for (table= file->open_tables; table != file->end_table; table++)
{
if ((err= mi_delete_all_rows(table->table)))
break;
}
DBUG_RETURN(err);
}
int ha_myisammrg::info(uint flag)
{
MYMERGE_INFO mrg_info;

1
storage/myisammrg/ha_myisammrg.h
View file

@ -131,6 +131,7 @@ public:
int rnd_pos(uchar * buf, uchar *pos);
void position(const uchar *record);
ha_rows records_in_range(uint inx, key_range *min_key, key_range *max_key);
int truncate();
int info(uint);
int reset(void);
int extra(enum ha_extra_function operation);

5
storage/perfschema/ha_perfschema.cc
View file

@ -345,6 +345,11 @@ int ha_perfschema::delete_all_rows(void)
DBUG_RETURN(result);
}
int ha_perfschema::truncate()
{
return delete_all_rows();
}
THR_LOCK_DATA **ha_perfschema::store_lock(THD *thd,
THR_LOCK_DATA **to,
enum thr_lock_type lock_type)

2
storage/perfschema/ha_perfschema.h
View file

@ -127,6 +127,8 @@ public:
int delete_all_rows(void);
int truncate();
int delete_table(const char *from);
int rename_table(const char * from, const char * to);