在存储过程中未找到Mysql CASE进行CASE STATEMENT [英] Mysql CASE NOT FOUND for CASE STATEMENT on a Stored Procedure

问题描述

im试图创建具有多个CASE STATEMENTS的存储过程 我有以下存储过程:

im trying to create a stored procedure that have multiples CASE STATEMENTS I have the following stored procedure:

BEGIN
CASE @olds
WHEN 'emp' THEN
    CASE @news
    WHEN 'loc' THEN
        UPDATE equipos SET pe=pe-1,pg=pg+1 WHERE id=@eqloc;
        UPDATE equipos SET pe=pe-1,pp=pp+1 WHERE id=@eqvis;
        UPDATE partidos SET `eqgan`=@news WHERE id=@mst;
        UPDATE log_partidos SET `status`=@news WHERE `match`=@mst;
    WHEN 'vis' THEN
        UPDATE equipos SET pe=pe-1,pg=pg+1 WHERE id=@eqvis;
        UPDATE equipos SET pe=pe-1,pp=pp+1 WHERE id=@eqloc;
        UPDATE partidos SET `eqgan`=@news WHERE id=@mst;
        UPDATE log_partidos SET `status`=@news WHERE `match`=@mst;
    END CASE;
WHEN 'loc' THEN
    CASE @news
    WHEN 'emp' THEN
        UPDATE equipos SET pe=pe+1,pg=pg-1 WHERE id=@eqloc;
        UPDATE equipos SET pe=pe+1,pp=pp-1 WHERE id=@eqvis;
        UPDATE partidos SET `eqgan`=@news WHERE id=@mst;
        UPDATE log_partidos SET `status`=@news WHERE `match`=@mst;
    WHEN 'vis' THEN
        UPDATE equipos SET pp=pp-1,pg=pg+1 WHERE id=@eqvis;
        UPDATE equipos SET pg=pg-1,pp=pp+1 WHERE id=@eqloc;
        UPDATE partidos SET `eqgan`=@news WHERE id=@mst;
        UPDATE log_partidos SET `status`=@news WHERE `match`=@mst;
    END CASE;
WHEN 'vis' THEN
    CASE @news
    WHEN 'emp' THEN
        UPDATE equipos SET pe=pe+1,pg=pg-1 WHERE id=@eqvis;
        UPDATE equipos SET pe=pe+1,pp=pp-1 WHERE id=@eqloc;
        UPDATE partidos SET `eqgan`=@news WHERE id=@mst;
        UPDATE log_partidos SET `status`=@news WHERE `match`=@mst;
    WHEN 'loc' THEN
        UPDATE equipos SET pp=pp-1,pg=pg+1 WHERE id=@eqloc;
        UPDATE equipos SET pg=pg-1,pp=pp+1 WHERE id=@eqvis;
        UPDATE partidos SET `eqgan`=@news WHERE id=@mst;
        UPDATE log_partidos SET `status`=@news WHERE `match`=@mst;
    END CASE;
END CASE;
END

每次执行此过程时，我都会遇到以下错误:"CASE语句未找到案例" 我在做什么错了?

Everytime im executing this procedure i got the following error is: "Case not found for CASE statement" What im doing wrong?

推荐答案

这是MySQL特有的问题.
在MySQL中，大小写必须始终具有有效的匹配项，因此必须具有ELSE子句. 并且由于匹配后的语句不能为空，因此可以像下面这样用空块填充它:

This is a MySQL specific problem.
In MySQL, a case must always have a valid match, thus an ELSE clause.
And as the statement after the match cannot be empty, you can fill it up with an empty block like so:

ELSE BEGIN END;

例如，一个有效的情况是:

So a valid case would be, for example:

CASE @news  
  WHEN 'emp' THEN  
    UPDATE equipos SET pe=pe+1,pg=pg-1 WHERE id=@eqvis;  
  WHEN 'loc' THEN  
    UPDATE equipos SET pp=pp-1,pg=pg+1 WHERE id=@eqloc;  
  ELSE BEGIN END;  
END CASE;

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