Question

我需要创建一个＆＃39; select＆＃39; mysql程序将接受多个参数，内联此程序将选择其他表

目标

存储过程必须接受多个参数
使用多个参数，程序应选择table_a，table_b和table_c

目前我正在使用此代码（它接受多个参数，但我不知道如何修改它以便在table_b和table_c上执行另一个选择）

DELIMITER //

CREATE PROCEDURE select_multiple_object(IN user_ids VARCHAR(65535))
BEGIN
    SET @query = CONCAT ('SELECt * FROM table_a WHERE userid IN (',user_ids,')');
    PREPARE stmt FROM @query;
    EXECUTE stmt;
    DEALLOCATE PREPARE stmt;
END //
DELIMITER ;

我真正想要实现的是：

DELIMITER //

CREATE PROCEDURE select_multiple_object(IN user_ids VARCHAR(65535))
BEGIN
    SET @query = CONCAT ('
        SELECt * FROM table_a WHERE userid IN (',user_ids,');
        SELECt * FROM table_b WHERE userid IN (',user_ids,');
        SELECt * FROM table_c WHERE userid IN (',user_ids,');
    ');
    PREPARE stmt FROM @query;
    EXECUTE stmt;
    DEALLOCATE PREPARE stmt;
END //
DELIMITER ;



CALL select_multiple_object('1,2,3')

Answer 1

首先汇编MySQL查询，然后发送查询，类似于以下内容：

$parameter = "user_ids";
$table = "table_a";
$query = 'SELECT * FROM ' . $parameter . ' WHERE userid IN (",' . $parameter . ',")';
$result = mysql_query($query);

要输入多个参数，只需使用循环根据需要重复此过程。

Mysql多个参数，在存储过程中有多个查询

1 个答案: