MySQL过程中的错误答案

【问题标题】：Error in Procedure MySQLMySQL过程中的错误
【发布时间】：2013-09-01 20:11:40
【问题描述】：

我在以下过程中遇到错误

DELIMITER // 

DROP PROCEDURE IF EXISTS getDestaque //

CREATE PROCEDURE getDestaque(
OUT v_id_imovel_1 INT,
OUT v_titulo_1 VARCHAR(200),
OUT v_cidade_1 VARCHAR(120),
OUT v_categoria_1 VARCHAR(100),
OUT v_foto_1 VARCHAR(100),
OUT v_id_imovel_2 INT,
OUT v_titulo_2 VARCHAR(200),
OUT v_cidade_2 VARCHAR(120),
OUT v_categoria_2 VARCHAR(100),
OUT v_foto_2 VARCHAR(100)
)
BEGIN

    SELECT I.id_imovel INTO v_id_imovel_1, 
    I.titulo INTO v_titulo_1, 
    C.cidade INTO v_cidade_1, 
    CAT.categoria INTO v_categoria_1, 
    IFT.foto INTO v_foto_1
    FROM imoveis AS I
    INNER JOIN cidades AS C ON I.id_cidade = C.id_cidade
    INNER JOIN categorias AS CAT ON I.id_categoria = CAT.id_categoria
    INNER JOIN imoveis_fotos AS IFT ON I.id_imovel = IFT.id_imovel AND IFT.principal = 1
    WHERE I.destaque_index = 1
    ORDER BY RAND() LIMIT 1;

    SELECT I.id_imovel INTO v_id_imovel_2, 
    I.titulo INTO v_titulo_2, 
    C.cidade INTO v_cidade_2, 
    CAT.categoria INTO v_categoria_2, 
    IFT.foto INTO v_foto_2
    FROM imoveis AS I
    INNER JOIN cidades AS C ON I.id_cidade = C.id_cidade
    INNER JOIN categorias AS CAT ON I.id_categoria = CAT.id_categoria
    INNER JOIN imoveis_fotos AS IFT ON I.id_imovel = IFT.id_imovel AND IFT.principal = 1
    WHERE I.destaque_index = 1 AND I.id_imovel <> v_id_imovel_1 
    ORDER BY RAND() LIMIT 1;

    UPDATE imoveis SET destaque_index_view = destaque_index_view+1 WHERE id_imovel = v_id_imovel_1 OR id_imovel = v_id_imovel_2;

END
//

DELIMITER ;

不工作，PhpMyAdmin 没有向我显示错误，谁能帮助我？

【问题讨论】：

标签： mysql sql stored-procedures procedure

【解决方案1】：

您应该在每个 SELECT 查询中只使用一次关键字 INTO。

SELECT value1, value2 INTO out_value1, out_value2 FROM some_table;

这应该可行：

DELIMITER // 

DROP PROCEDURE IF EXISTS getDestaque //

CREATE PROCEDURE getDestaque(
OUT v_id_imovel_1 INT,
OUT v_titulo_1 VARCHAR(200),
OUT v_cidade_1 VARCHAR(120),
OUT v_categoria_1 VARCHAR(100),
OUT v_foto_1 VARCHAR(100),
OUT v_id_imovel_2 INT,
OUT v_titulo_2 VARCHAR(200),
OUT v_cidade_2 VARCHAR(120),
OUT v_categoria_2 VARCHAR(100),
OUT v_foto_2 VARCHAR(100)
)
BEGIN

    SELECT I.id_imovel, I.titulo, C.cidade, CAT.categoria, IFT.foto INTO v_id_imovel_1, 
     v_titulo_1, 
     v_cidade_1, 
     v_categoria_1, 
     v_foto_1
    FROM imoveis AS I
    INNER JOIN cidades AS C ON I.id_cidade = C.id_cidade
    INNER JOIN categorias AS CAT ON I.id_categoria = CAT.id_categoria
    INNER JOIN imoveis_fotos AS IFT ON I.id_imovel = IFT.id_imovel AND IFT.principal = 1
    WHERE I.destaque_index = 1
    ORDER BY RAND() LIMIT 1;

    SELECT I.id_imovel, I.titulo, C.cidade, CAT.categoria, IFT.foto INTO v_id_imovel_2, 
     v_titulo_2, 
     v_cidade_2, 
     v_categoria_2, 
     v_foto_2
    FROM imoveis AS I
    INNER JOIN cidades AS C ON I.id_cidade = C.id_cidade
    INNER JOIN categorias AS CAT ON I.id_categoria = CAT.id_categoria
    INNER JOIN imoveis_fotos AS IFT ON I.id_imovel = IFT.id_imovel AND IFT.principal = 1
    WHERE I.destaque_index = 1 AND I.id_imovel <> v_id_imovel_1 
    ORDER BY RAND() LIMIT 1;

    UPDATE imoveis SET destaque_index_view = destaque_index_view+1 WHERE id_imovel = v_id_imovel_1 OR id_imovel = v_id_imovel_2;

END
//

DELIMITER ;

【讨论】：