--删除
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drop procedure if exists up_common_select |
--创建
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CREATE PROCEDURE `up_common_select` ( in t_name varchar(50) ) begin declare v_sql varchar(500); set v_sql= concat(‘select * from ‘,t_name); select v_sql;--注意:prepare(预处理)execute stmt using @var,只能跟@var变量,declare和传入的变量不行!!! set @v_sql=v_sql; prepare stmt from @v_sql; EXECUTE stmt ; deallocate prepare stmt; end; |
--调用
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call up_common_select(‘admin_authority‘); |
注意事项
1 mysql5.0.13之后支持在存储过程中调用prepare
2 prepare stmt from ‘select * from ?‘; (错)
mysql5.0.24,prepare尚不支持 表名做变量!
解决方案:用 contat()函数,组合字符串
3 execute stmt [using @var,@var2]
必须是@var形式的变量,传入的参数变量,declare变量不行
4. deallocate prepare stmt; 显式的释放prepare,如果不释放,mysql会释放,!