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2c9f5cc706
To make MySQL compatible with some ODBC applications, you can find the AUTO_INCREMENT value for the last inserted row with the following query: SELECT * FROM tbl_name WHERE auto_col IS NULL. This is done with a special code that replaces 'auto_col IS NULL' with 'auto_col = LAST_INSERT_ID'. However this also resets the LAST_INSERT_ID to 0 as it uses it for a flag so as to ensure that only the first SELECT ... WHERE auto_col IS NULL after an INSERT has this special behaviour. In order to avoid resetting the LAST_INSERT_ID a special flag is introduced in the THD class. This flag is used to restrict the second and subsequent SELECTs instead of LAST_INSERT_ID.
89 lines
1.7 KiB
Text
89 lines
1.7 KiB
Text
stop slave;
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drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
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reset master;
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reset slave;
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drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
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start slave;
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create table t1(a int auto_increment, key(a));
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create table t2(b int auto_increment, c int, key(b));
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insert into t1 values (1),(2),(3);
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insert into t1 values (null);
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insert into t2 values (null,last_insert_id());
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select * from t1;
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a
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1
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2
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3
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4
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select * from t2;
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b c
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1 4
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drop table t1;
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drop table t2;
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create table t1(a int auto_increment, key(a)) engine=innodb;
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create table t2(b int auto_increment, c int, key(b), foreign key(b) references t1(a)) engine=innodb;
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SET FOREIGN_KEY_CHECKS=0;
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insert into t1 values (10);
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insert into t1 values (null),(null),(null);
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insert into t2 values (5,0);
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insert into t2 values (null,last_insert_id());
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SET FOREIGN_KEY_CHECKS=1;
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select * from t1;
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a
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10
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11
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12
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13
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select * from t2;
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b c
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5 0
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6 11
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drop table t2;
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drop table t1;
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create table t1(a int auto_increment, key(a));
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create table t2(b int auto_increment, c int, key(b));
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insert into t1 values (10);
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insert into t1 values (null),(null),(null);
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insert into t2 values (5,0);
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insert into t2 (c) select * from t1;
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select * from t2;
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b c
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5 0
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6 10
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7 11
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8 12
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9 13
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select * from t1;
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a
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10
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11
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12
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13
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select * from t2;
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b c
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5 0
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6 10
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7 11
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8 12
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9 13
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drop table t1;
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drop table t2;
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SET TIMESTAMP=1000000000;
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CREATE TABLE t1 ( a INT UNIQUE );
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SET FOREIGN_KEY_CHECKS=0;
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INSERT INTO t1 VALUES (1),(1);
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ERROR 23000: Duplicate entry '1' for key 1
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drop table t1;
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create table t1(a int auto_increment, key(a));
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create table t2(a int);
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insert into t1 (a) values (null);
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insert into t2 (a) select a from t1 where a is null;
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insert into t2 (a) select a from t1 where a is null;
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select * from t2;
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a
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1
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select * from t2;
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a
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1
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drop table t1;
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drop table t2;
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