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AUTO_INCREMENT support for MERGE

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HA_AUTO_PART_KEY support for handler parent class
This commit is contained in:
serg@sergbook.mysql.com 2002-07-21 23:55:32 +02:00
parent 0642d54a37
commit e20d9e06c5
5 changed files with 108 additions and 23 deletions
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22
Docs/manual.texi
View file

@ -37793,8 +37793,8 @@ The disadvantages with @code{MERGE} tables are:
@itemize @bullet
@item
You can only use identical @code{MyISAM} tables for a @code{MERGE} table.
@item
@code{AUTO_INCREMENT} columns are not automatically updated on @code{INSERT}.
@c @item
@c @code{AUTO_INCREMENT} columns are not automatically updated on @code{INSERT}.
@item
@code{REPLACE} doesn't work.
@item
@ -37834,13 +37834,13 @@ CREATE TABLE t1 (a INT AUTO_INCREMENT PRIMARY KEY, message CHAR(20));
CREATE TABLE t2 (a INT AUTO_INCREMENT PRIMARY KEY, message CHAR(20));
INSERT INTO t1 (message) VALUES ("Testing"),("table"),("t1");
INSERT INTO t2 (message) VALUES ("Testing"),("table"),("t2");
CREATE TABLE total (a INT NOT NULL, message CHAR(20), KEY(a))
CREATE TABLE total (a INT AUTO_INCREMENT PRIMARY KEY, message CHAR(20))
TYPE=MERGE UNION=(t1,t2) INSERT_METHOD=LAST;
@end example
Note that we didn't create a @code{UNIQUE} or @code{PRIMARY KEY} in the
@code{total} table as the key isn't going to be unique in the @code{total}
table.
@c Note that we didn't create a @code{UNIQUE} or @code{PRIMARY KEY} in the
@c @code{total} table as the key isn't going to be unique in the @code{total}
@c table.
Note that you can also manipulate the @file{.MRG} file directly from
the outside of the MySQL server:
@ -37867,6 +37867,10 @@ mysql> SELECT * FROM total;
+---+---------+
@end example
Note that the @code{a} column, though declared as @code{PRIMARY KEY},
is not really unique, as @code{MERGE} table cannot enforce uniqueness
over a set of underlying @code{MyISAM} tables.
To remap a @code{MERGE} table you can do one of the following:
@itemize @bullet
@ -37894,8 +37898,8 @@ The following are the known problems with @code{MERGE} tables:
A @code{MERGE} table cannot maintain @code{UNIQUE} constraints over the
whole table. When you do @code{INSERT}, the data goes into the first or
last table (according to @code{INSERT_METHOD=xxx}) and this @code{MyISAM}
table ensures that the data are unique, but it knows nothing about the
first @code{MyISAM} table.
table ensures that the data are unique, but it knows nothing about
others @code{MyISAM} tables.
@item
@code{DELETE FROM merge_table} used without a @code{WHERE}
will only clear the mapping for the table, not delete everything in the
@ -49699,6 +49703,8 @@ Our TODO section contains what we plan to have in 4.0. @xref{TODO MySQL 4.0}.
@itemize @bullet
@item
Fixed a bug that made the pager option in the mysql client non-functional.
@item
Added full @code{AUTO_INCREMENT} support to @code{MERGE} tables.
@end itemize

87
mysql-test/r/merge.result
View file

@ -275,12 +275,12 @@ a b
1 2
drop table t3,t1,t2;
drop table if exists t6, t5, t4, t3, t2, t1;
create table t1 (a int not null, b int not null, key(a,b));
create table t2 (a int not null, b int not null, key(a,b));
create table t1 (a int not null, b int not null auto_increment, primary key(a,b));
create table t2 (a int not null, b int not null auto_increment, primary key(a,b));
create table t3 (a int not null, b int not null, key(a,b)) UNION=(t1,t2) INSERT_METHOD=NO;
create table t4 (a int not null, b int not null, key(a,b)) TYPE=MERGE UNION=(t1,t2) INSERT_METHOD=NO;
create table t5 (a int not null, b int not null, key(a,b)) TYPE=MERGE UNION=(t1,t2) INSERT_METHOD=FIRST;
create table t6 (a int not null, b int not null, key(a,b)) TYPE=MERGE UNION=(t1,t2) INSERT_METHOD=LAST;
create table t5 (a int not null, b int not null auto_increment, primary key(a,b)) TYPE=MERGE UNION=(t1,t2) INSERT_METHOD=FIRST;
create table t6 (a int not null, b int not null auto_increment, primary key(a,b)) TYPE=MERGE UNION=(t1,t2) INSERT_METHOD=LAST;
show create table t3;
Table Create Table
t3 CREATE TABLE `t3` (
@ -299,18 +299,18 @@ show create table t5;
Table Create Table
t5 CREATE TABLE `t5` (
`a` int(11) NOT NULL default '0',
`b` int(11) NOT NULL default '0',
KEY `a` (`a`,`b`)
`b` int(11) NOT NULL auto_increment,
PRIMARY KEY (`a`,`b`)
) TYPE=MRG_MyISAM INSERT_METHOD=FIRST UNION=(t1,t2)
show create table t6;
Table Create Table
t6 CREATE TABLE `t6` (
`a` int(11) NOT NULL default '0',
`b` int(11) NOT NULL default '0',
KEY `a` (`a`,`b`)
`b` int(11) NOT NULL auto_increment,
PRIMARY KEY (`a`,`b`)
) TYPE=MRG_MyISAM INSERT_METHOD=LAST UNION=(t1,t2)
insert into t1 values (1,1),(1,2),(1,3),(1,4);
insert into t2 values (2,1),(2,2),(2,3),(2,4);
insert into t1 values (1,NULL),(1,NULL),(1,NULL),(1,NULL);
insert into t2 values (2,NULL),(2,NULL),(2,NULL),(2,NULL);
select * from t3 order by b,a limit 3;
a b
select * from t4 order by b,a limit 3;
@ -461,6 +461,73 @@ a b
5 2
6 1
6 2
select 1;
1
1
insert into t5 values (1,NULL),(5,NULL);
insert into t6 values (2,NULL),(6,NULL);
select * from t1 order by a,b;
a b
1 1
1 2
1 3
1 4
1 5
4 1
4 2
5 1
5 2
5 3
select * from t2 order by a,b;
a b
2 1
2 2
2 3
2 4
2 5
6 1
6 2
6 3
select * from t5 order by a,b;
a b
1 1
1 2
1 3
1 4
1 5
2 1
2 2
2 3
2 4
2 5
4 1
4 2
5 1
5 2
5 3
6 1
6 2
6 3
select * from t6 order by a,b;
a b
1 1
1 2
1 3
1 4
1 5
2 1
2 2
2 3
2 4
2 5
4 1
4 2
5 1
5 2
5 3
6 1
6 2
6 3
drop table if exists t6, t5, t4, t3, t2, t1;
CREATE TABLE t1 ( a int(11) NOT NULL default '0', b int(11) NOT NULL default '0', PRIMARY KEY (a,b)) TYPE=MyISAM;
INSERT INTO t1 VALUES (1,1), (2,1);

3
sql/ha_myisammrg.cc
View file

@ -75,8 +75,7 @@ int ha_myisammrg::write_row(byte * buf)
if (table->time_stamp)
update_timestamp(buf+table->time_stamp-1);
if (table->next_number_field && buf == table->record[0])
return (my_errno=HA_ERR_WRONG_COMMAND);
// update_auto_increment(); - [phi] have to check this before allowing it
update_auto_increment();
return myrg_write(file,buf);
}

2
sql/ha_myisammrg.h
View file

@ -34,7 +34,7 @@ class ha_myisammrg: public handler
const char **bas_ext() const;
ulong table_flags() const
{
return (HA_REC_NOT_IN_SEQ | HA_READ_RND_SAME |
return (HA_REC_NOT_IN_SEQ | HA_READ_RND_SAME | HA_AUTO_PART_KEY |
HA_KEYPOS_TO_RNDPOS | HA_LASTKEY_ORDER |
HA_NULL_KEY | HA_BLOB_KEY);
}

17
sql/handler.cc
View file

@ -628,16 +628,29 @@ longlong handler::get_auto_increment()
{
longlong nr;
int error;
(void) extra(HA_EXTRA_KEYREAD);
index_init(table->next_number_index);
error=index_last(table->record[1]);
if (!table->next_number_key_offset)
{ // Autoincrement at key-start
error=index_last(table->record[1]);
}
else
{
byte key[MAX_KEY_LENGTH];
key_copy(key,table,table->next_number_index,
table->next_number_key_offset);
error=index_read(table->record[1], key, table->next_number_key_offset,
HA_READ_PREFIX_LAST);
}
if (error)
nr=1;
else
nr=(longlong) table->next_number_field->
val_int_offset(table->rec_buff_length)+1;
(void) extra(HA_EXTRA_NO_KEYREAD);
index_end();
(void) extra(HA_EXTRA_NO_KEYREAD);
return nr;
}