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mysqldump / SHOW CREATE TABLE will show the NEXT available value for the PK, rather than the *first* one that was available (that named in the original CREATE TABLE ... AUTO_INCREMENT = ... statement). This should produce correct and robust behaviour for the obvious use cases -- when no data were inserted, then we'll produce a statement featuring the same value the original CREATE TABLE had; if we dump with values, INSERTing the values on the target machine should set the correct next_ID anyway (and if not, we'll still have our AUTO_INCREMENT = ... to do that). Lastly, just the CREATE statement (with no data) for a table that saw inserts would still result in a table that new values could safely be inserted to). There seems to be no robust way however to see whether the next_ID field is > 1 because it was set to something else with CREATE TABLE ... AUTO_INCREMENT = ..., or because there is an AUTO_INCREMENT column in the table (but no initial value was set with AUTO_INCREMENT = ...) and then one or more rows were INSERTed, counting up next_ID. This means that in both cases, we'll generate an AUTO_INCREMENT = ... clause in SHOW CREATE TABLE / mysqldump. As we also show info on, say, charsets even if the user did not explicitly give that info in their own CREATE TABLE, this shouldn't be an issue. As per above, the next_ID will be affected by any INSERTs that have taken place, though. This /should/ result in correct and robust behaviour, but it may look non-intuitive to some users if they CREATE TABLE ... AUTO_INCREMENT = 1000 and later (after some INSERTs) have SHOW CREATE TABLE give them a different value (say, CREATE TABLE ... AUTO_INCREMENT = 1006), so the docs should possibly feature a caveat to that effect. It's not very intuitive the way it works now (with the fix), but it's *correct*. We're not storing the original value anyway, if we wanted that, we'd have to change on-disk representation? If we do dump/load cycles with empty DBs, nothing will change. This changeset includes an additional test case that proves that tables with rows will create the same next_ID for AUTO_INCREMENT = ... across dump/restore cycles. Confirmed by support as likely solution for client's problem. mysql-test/r/auto_increment.result: test for creation of AUTO_INCREMENT=... clause mysql-test/r/gis-rtree.result: Add AUTO_INCREMENT=... clauses where appropriate mysql-test/r/mysqldump.result: show that AUTO_INCREMENT=... will survive dump/restore cycles mysql-test/r/symlink.result: Add AUTO_INCREMENT=... clauses where appropriate mysql-test/t/auto_increment.test: test for creation of AUTO_INCREMENT=... clause mysql-test/t/mysqldump.test: show that AUTO_INCREMENT=... will survive dump/restore cycles sql/sql_show.cc: Add AUTO_INCREMENT=... to output of SHOW CREATE TABLE if there is an AUTO_INCREMENT column, and NEXT_ID > 1 (the default). We must not print the clause for engines that do not support this as it would break the import of dumps, but as of this writing, the test for whether AUTO_INCREMENT columns are allowed and wether AUTO_INCREMENT=... is supported is identical, !(file->table_flags() & HA_NO_AUTO_INCREMENT)) Because of that, we do not explicitly test for the feature, but may extrapolate its existence from that of an AUTO_INCREMENT column.
241 lines
6.7 KiB
Text
241 lines
6.7 KiB
Text
#
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# Test of auto_increment; The test for BDB tables is in bdb.test
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#
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--disable_warnings
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drop table if exists t1;
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drop table if exists t2;
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--enable_warnings
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SET SQL_WARNINGS=1;
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create table t1 (a int not null auto_increment,b int, primary key (a)) engine=myisam auto_increment=3;
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insert into t1 values (1,1),(NULL,3),(NULL,4);
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delete from t1 where a=4;
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insert into t1 values (NULL,5),(NULL,6);
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select * from t1;
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delete from t1 where a=6;
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#show table status like "t1";
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replace t1 values (3,1);
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ALTER TABLE t1 add c int;
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replace t1 values (3,3,3);
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insert into t1 values (NULL,7,7);
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update t1 set a=8,b=b+1,c=c+1 where a=7;
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insert into t1 values (NULL,9,9);
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select * from t1;
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drop table t1;
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create table t1 (
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skey tinyint unsigned NOT NULL auto_increment PRIMARY KEY,
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sval char(20)
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);
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insert into t1 values (NULL, "hello");
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insert into t1 values (NULL, "hey");
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select * from t1;
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select _rowid,t1._rowid,skey,sval from t1;
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drop table t1;
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#
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# Test auto_increment on sub key
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#
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create table t1 (a char(10) not null, b int not null auto_increment, primary key(a,b));
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insert into t1 values ("a",1),("b",2),("a",2),("c",1);
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insert into t1 values ("a",NULL),("b",NULL),("c",NULL),("e",NULL);
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insert into t1 (a) values ("a"),("b"),("c"),("d");
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insert into t1 (a) values ('k'),('d');
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insert into t1 (a) values ("a");
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insert into t1 values ("d",last_insert_id());
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select * from t1;
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drop table t1;
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create table t1 (ordid int(8) not null auto_increment, ord varchar(50) not null, primary key (ordid), index(ord,ordid));
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insert into t1 (ordid,ord) values (NULL,'sdj'),(NULL,'sdj');
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select * from t1;
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drop table t1;
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create table t1 (ordid int(8) not null auto_increment, ord varchar(50) not null, primary key (ord,ordid));
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insert into t1 values (NULL,'sdj'),(NULL,'sdj'),(NULL,"abc"),(NULL,'abc'),(NULL,'zzz'),(NULL,'sdj'),(NULL,'abc');
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select * from t1;
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drop table t1;
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create table t1 (sid char(5), id int(2) NOT NULL auto_increment, key(sid, id));
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create table t2 (sid char(20), id int(2));
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insert into t2 values ('skr',NULL),('skr',NULL),('test',NULL);
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insert into t1 select * from t2;
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select * from t1;
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drop table t1,t2;
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#
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# Test of auto_increment columns when they are set to 0
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#
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create table t1 (a int not null primary key auto_increment);
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insert into t1 values (0);
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update t1 set a=0;
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select * from t1;
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check table t1;
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drop table t1;
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#
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# Test negative values (Bug #1366)
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#
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create table t1 (a int not null auto_increment primary key);
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insert into t1 values (NULL);
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insert into t1 values (-1);
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select last_insert_id();
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insert into t1 values (NULL);
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select * from t1;
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drop table t1;
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create table t1 (a int not null auto_increment primary key) /*!40102 engine=heap */;
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insert into t1 values (NULL);
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insert into t1 values (-1);
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select last_insert_id();
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insert into t1 values (NULL);
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select * from t1;
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drop table t1;
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#
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# last_insert_id() madness
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#
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create table t1 (i tinyint unsigned not null auto_increment primary key);
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insert into t1 set i = 254;
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insert into t1 set i = null;
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select last_insert_id();
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explain extended select last_insert_id();
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--error 1062
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insert into t1 set i = 254;
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select last_insert_id();
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--error 1062
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insert into t1 set i = null;
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select last_insert_id();
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drop table t1;
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create table t1 (i tinyint unsigned not null auto_increment, key (i));
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insert into t1 set i = 254;
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insert into t1 set i = null;
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select last_insert_id();
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insert into t1 set i = null;
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select last_insert_id();
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drop table t1;
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create table t1 (i tinyint unsigned not null auto_increment primary key, b int, unique (b));
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insert into t1 values (NULL, 10);
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select last_insert_id();
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insert into t1 values (NULL, 15);
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select last_insert_id();
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--error 1062
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insert into t1 values (NULL, 10);
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select last_insert_id();
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drop table t1;
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create table t1(a int auto_increment,b int null,primary key(a));
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SET SQL_MODE=NO_AUTO_VALUE_ON_ZERO;
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insert into t1(a,b)values(NULL,1);
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insert into t1(a,b)values(200,2);
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insert into t1(a,b)values(0,3);
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insert into t1(b)values(4);
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insert into t1(b)values(5);
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insert into t1(b)values(6);
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insert into t1(b)values(7);
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select * from t1 order by b;
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alter table t1 modify b mediumint;
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select * from t1 order by b;
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create table t2 (a int);
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insert t2 values (1),(2);
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alter table t2 add b int auto_increment primary key;
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select * from t2;
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drop table t2;
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delete from t1 where a=0;
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update t1 set a=0 where b=5;
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select * from t1 order by b;
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delete from t1 where a=0;
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update t1 set a=NULL where b=6;
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update t1 set a=300 where b=7;
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SET SQL_MODE='';
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insert into t1(a,b)values(NULL,8);
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insert into t1(a,b)values(400,9);
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insert into t1(a,b)values(0,10);
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insert into t1(b)values(11);
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insert into t1(b)values(12);
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insert into t1(b)values(13);
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insert into t1(b)values(14);
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select * from t1 order by b;
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delete from t1 where a=0;
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update t1 set a=0 where b=12;
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select * from t1 order by b;
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delete from t1 where a=0;
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update t1 set a=NULL where b=13;
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update t1 set a=500 where b=14;
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select * from t1 order by b;
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drop table t1;
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#
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# Test of behavior of ALTER TABLE when coulmn containing NULL or zeroes is
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# converted to AUTO_INCREMENT column
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#
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create table t1 (a bigint);
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insert into t1 values (1), (2), (3), (NULL), (NULL);
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alter table t1 modify a bigint not null auto_increment primary key;
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select * from t1;
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drop table t1;
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create table t1 (a bigint);
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insert into t1 values (1), (2), (3), (0), (0);
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alter table t1 modify a bigint not null auto_increment primary key;
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select * from t1;
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drop table t1;
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# We still should be able to preserve zero in NO_AUTO_VALUE_ON_ZERO mode
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create table t1 (a bigint);
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insert into t1 values (0), (1), (2), (3);
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set sql_mode=NO_AUTO_VALUE_ON_ZERO;
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alter table t1 modify a bigint not null auto_increment primary key;
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set sql_mode= '';
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select * from t1;
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drop table t1;
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# It also sensible to preserve zeroes if we are converting auto_increment
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# column to auto_increment column (or not touching it at all, which is more
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# common case probably)
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create table t1 (a int auto_increment primary key , b int null);
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set sql_mode=NO_AUTO_VALUE_ON_ZERO;
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insert into t1 values (0,1),(1,2),(2,3);
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select * from t1;
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set sql_mode= '';
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alter table t1 modify b varchar(255);
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insert into t1 values (0,4);
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select * from t1;
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drop table t1;
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#
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# BUG #10045: Problem with composite AUTO_INCREMENT + BLOB key
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CREATE TABLE t1 ( a INT AUTO_INCREMENT, b BLOB, PRIMARY KEY (a,b(10)));
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INSERT INTO t1 (b) VALUES ('aaaa');
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CHECK TABLE t1;
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INSERT INTO t1 (b) VALUES ('');
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CHECK TABLE t1;
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INSERT INTO t1 (b) VALUES ('bbbb');
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CHECK TABLE t1;
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DROP TABLE IF EXISTS t1;
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# BUG #19025:
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CREATE TABLE `t1` (
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t1_name VARCHAR(255) DEFAULT NULL,
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t1_id INT(10) UNSIGNED NOT NULL AUTO_INCREMENT,
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KEY (t1_name),
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PRIMARY KEY (t1_id)
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) AUTO_INCREMENT = 1000;
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INSERT INTO t1 (t1_name) VALUES('MySQL');
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INSERT INTO t1 (t1_name) VALUES('MySQL');
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INSERT INTO t1 (t1_name) VALUES('MySQL');
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SELECT * from t1;
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SHOW CREATE TABLE `t1`;
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DROP TABLE `t1`;
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--echo End of 4.1 tests
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