mysql设置自增长id为某个变量的值

alter table blog_table auto_increment=500; 

 

如果想用变量

就会报错

 

set @a=500;

alter table blog_table AUTO_INCREMENT=@a;

ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '@a' at line 1

 

应该这样写：

SET @sql = CONCAT('ALTER TABLE `blog_table` AUTO_INCREMENT = ', @a);

PREPARE st FROM @sql;

EXECUTE st;

 

执行成功