mysql存储过程输入参数拆分_MySql带参数存储过程(动态执行SQL语句)

本文分享的这个mysql存储过程是根据用户输入的条件和排序方式查询用户的信息，排序条件可以没有。

调用方式：call GetUsersDynamic('age<=30','');

代码：

复制代码 代码示例:

/********动态查询用户的信息********/

CREATE PROCEDURE GetUsersDynamic(WhereCondition varchar(500),OrderByExpress varchar(100))

begin

declare stmt varchar(2000);

if LENGTH(OrderbyExpress)>0 then

begin

set @sqlstr=concat('select id,name,password,age,getdate(adddate) as AddDate from users where ',WhereCondition,' order by ',OrderByExpress);

end;

else

begin

set @sqlstr=concat('select id,name,password,age,getdate(adddate) as AddDate from users where ',WhereCondition);

end;

end if;

prepare stmt from @sqlstr;

execute stmt;

end;

getdate()是一个自定义的函数，作用是返回日期的短格式

复制代码 代码示例:

CREATE DEFINER=`root`@`localhost` FUNCTION `getdate`($date datetime) RETURNS varchar(50) CHARSET latin1

return date_format($date,'%Y-%m-%d');

动态插入数据的存储过程，(注意四个单引号表示一个一引号)：

复制代码 代码示例:

CREATE DEFINER=`root`@`localhost` PROCEDURE `InsertUser`(in name2 varchar(50),in password2 varchar(32),in age2 int,in adddate2 datetime)

begin

DECLARE stmt varchar(2000);

set @sqlstr=concat('insert into users(name,password,age,adddate) values(');

set @sqlstr=concat(@sqlstr,'''',name2,'''',',','''',password2,'''',',',age2,',','''',adddate2,'''',')');

prepare stmt from @sqlstr;

execute stmt;

end;

附，另一种带参数的形式，在mysql存储过程中动态执行sql文。

代码：

复制代码 代码示例:

mysql> PREPARE stmt1 FROM 'SELECT SQRT(POW(?,2) + POW(?,2)) AS hypotenuse';

mysql> SET @a = 3;

mysql> SET @b = 4;

mysql> EXECUTE stmt1 USING @a, @b;

mysql> SET @a = 'select * from table1 ';

mysql> SET @b = 'where column1>10 limit 1';

mysql> SET @a = concat(@a,@b);

mysql> PREPARE stmt1 FROM @a;

mysql> EXECUTE stmt1;