存储过程和查询执行之间的不同结果

Question

我正在尝试使用 Navicat 使用 mysql 执行一个存储过程，当我执行这个存储过程时，我得到了 0 行，但是当我执行我想要的存储过程部分时，我得到了 1 行这就是我想要的。存储过程是这样的：

BEGIN
#Routine body goes here...

IF @autor=0 THEN

 SELECT DISTINCT bdocus.ano_pub
  FROM            bdocus INNER JOIN
                     descriptores_bdocus ON bdocus.nserie = descriptores_bdocus.nserie INNER JOIN
                     descriptores ON descriptores_bdocus.iddescriptor = descriptores.id 
  WHERE        (bdocus.descriptores LIKE '%Victimización%')AND(bdocus.ano_pub LIKE CONCAT(@anyo,'%')) AND (bdocus.codigo_area LIKE CONCAT(@tema,'%')) AND(bdocus.codigo_colectivo LIKE CONCAT(@colectivo,'%')) AND (descriptores.nombre = @descriptores)
 GROUP BY bdocus.ano_pub
 ORDER BY bdocus.ano_pub DESC;
ELSE
 SELECT DISTINCT bdocus.ano_pub
 FROM            bdocus INNER JOIN
                     descriptores_bdocus ON bdocus.nserie = descriptores_bdocus.nserie INNER JOIN
                     descriptores ON descriptores_bdocus.iddescriptor = descriptores.id INNER JOIN
                     autores_bdocus ON bdocus.nserie = autores_bdocus.nserie
  WHERE        (bdocus.descriptores LIKE '%Victimización%') AND (autores_bdocus.idautor = @autor) AND(bdocus.ano_pub LIKE CONCAT(@anyo,'%')) AND (bdocus.codigo_area LIKE CONCAT(@tema,'%')) AND(bdocus.codigo_colectivo LIKE CONCAT(@colectivo,'%')) AND (descriptores.nombre = @descriptores)
  GROUP BY bdocus.ano_pub
  ORDER BY bdocus.ano_pub DESC;
  END IF;

END

参数是这样的：

IN `@anyo` varchar(20),IN `@tema` varchar(20),IN `@autor` int,  
IN `@colectivo` varchar(30),IN `@descriptores` varchar(40)

我想要的值是 @anyo='2013'、@tema='%'、@autor=44439、@colectivo='%' 和 @descriptores='Violencia sexual'.

当我运行存储过程的第二部分时我的意思是：

SELECT DISTINCT bdocus.ano_pub
FROM            bdocus INNER JOIN
                     descriptores_bdocus ON bdocus.nserie = descriptores_bdocus.nserie INNER JOIN
                     descriptores ON descriptores_bdocus.iddescriptor = descriptores.id INNER JOIN
                     autores_bdocus ON bdocus.nserie = autores_bdocus.nserie
 WHERE        (bdocus.descriptores LIKE '%Victimización%') AND (autores_bdocus.idautor = 44439) AND(bdocus.ano_pub LIKE CONCAT('%','%')) AND (bdocus.codigo_area LIKE CONCAT('%','%')) AND(bdocus.codigo_colectivo LIKE CONCAT('%','%')) AND (descriptores.nombre = 'Violencia sexual')
GROUP BY bdocus.ano_pub
ORDER BY bdocus.ano_pub DESC;

我得到了一行我想要的值。那么区别在哪里呢？提前致谢。

Answer 1

我认为你没有得到结果是因为条件，我的意思是，你的程序不会进入 'else' 部分，因此你没有得到那个结果。您可以做的是尝试运行分开第一个 select

SELECT DISTINCT bdocus.ano_pub
  FROM            bdocus INNER JOIN
                     descriptores_bdocus ON bdocus.nserie = descriptores_bdocus.nserie INNER JOIN
                     descriptores ON descriptores_bdocus.iddescriptor = descriptores.id 
  WHERE        (bdocus.descriptores LIKE '%Victimización%')AND(bdocus.ano_pub LIKE CONCAT(@anyo,'%')) AND (bdocus.codigo_area LIKE CONCAT(@tema,'%')) AND(bdocus.codigo_colectivo LIKE CONCAT(@colectivo,'%')) AND (descriptores.nombre = @descriptores)
 GROUP BY bdocus.ano_pub
 ORDER BY bdocus.ano_pub DESC;

只是看看是否与整个过程的结果相同，如果您像运行过程时那样得到 0 行，可能就是这个原因。尝试更改条件，以便首先检查第一个 select（我认为这是您最需要的那个），然后再检查另一个。

应该是这样的

-- see that i changed the condition
IF @autor != 0 THEN

 SELECT DISTINCT bdocus.ano_pub
 FROM            bdocus INNER JOIN
                     descriptores_bdocus ON bdocus.nserie = descriptores_bdocus.nserie INNER JOIN
                     descriptores ON descriptores_bdocus.iddescriptor = descriptores.id INNER JOIN
                     autores_bdocus ON bdocus.nserie = autores_bdocus.nserie
  WHERE        (bdocus.descriptores LIKE '%Victimización%') AND (autores_bdocus.idautor = @autor) AND(bdocus.ano_pub LIKE CONCAT(@anyo,'%')) AND (bdocus.codigo_area LIKE CONCAT(@tema,'%')) AND(bdocus.codigo_colectivo LIKE CONCAT(@colectivo,'%')) AND (descriptores.nombre = @descriptores)
  GROUP BY bdocus.ano_pub
  ORDER BY bdocus.ano_pub DESC;
  END IF;

ELSE

SELECT DISTINCT bdocus.ano_pub
  FROM            bdocus INNER JOIN
                     descriptores_bdocus ON bdocus.nserie = descriptores_bdocus.nserie INNER JOIN
                     descriptores ON descriptores_bdocus.iddescriptor = descriptores.id 
  WHERE        (bdocus.descriptores LIKE '%Victimización%')AND(bdocus.ano_pub LIKE CONCAT(@anyo,'%')) AND (bdocus.codigo_area LIKE CONCAT(@tema,'%')) AND(bdocus.codigo_colectivo LIKE CONCAT(@colectivo,'%')) AND (descriptores.nombre = @descriptores)
 GROUP BY bdocus.ano_pub
 ORDER BY bdocus.ano_pub DESC;

END

试一试并告诉我进展如何，其他可能的事情是您在调用过程时输入的参数

Answer 2

重要的是要指出 9.4. User-Defined Variables and routine parameters 13.1.15. CREATE PROCEDURE and CREATE FUNCTION Syntax 之间的区别，是不同的变量。

在您的示例中，@anyo 可能是 NULL，而 `@anyo` 分配给了 '2013'。

SQL Fiddle example

存储过程和查询执行之间的不同结果

Different result between stored procedure and query execution

mysql

stored-procedures