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MYSQL存储过程发生Result consisted of more than one r...解决_MySQL

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Release: 2016-06-01 13:29:36
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MYSQL存储过程发生Result consisted of more than one r...

 

摘要: MYSQL存储过程错误

 

SELECT … INTO …

 

这个SELECT语法把选定的列直接存储到变量。因此,只有单一的行可以被取回。

 

在使用的时候,要注意,加上LIMIT 1

 

SELECT id,data INTO x,y FROM topic LIMIT 1;
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另外,这种赋值语句还有个规矩就是参数名和字段名不能冲突,不然能够执行过去,但是却没有给参数赋值,这是个很隐性的错误,可以参考手册上的:

重要: SQL变量名不能和列名一样。如果SELECT ... INTO这样的SQL语句包含一个对列的参考,并包含一个与列相同名字的局部变量,MySQL当前把参考解释为一个变量的名字。

DELIMITER //CREATE PROCEDURE mytopic (        topicId INT(4),        title VARCHAR(50)        )  BEGIN        SELECT topicId,title     INTO topicId,title           FROM tbl_topic limit 1;  END//DELIMITER ;
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当这个程序被调用的时候,无论topicId,title列的值是什么,变量newname将返回值‘NULL’。

即:CALL mytopic(@topicId,@title);SELECT @topicId,@title;显示结果:@topicId  @titleNULL        NULL
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