Question

我在mysql中有一个带有几个查询的存储过程，我需要对该查询执行一些操作。

这是存储过程中的一些代码：

    BEGIN
    SET @@session.collation_connection = @@global.collation_connection;

    DROP TEMPORARY TABLE IF EXISTS innerContainers;
    CREATE TEMPORARY TABLE `innerContainers` (
        `id_container` INT(10) NOT NULL,
        `display_name` VARCHAR(100) NOT NULL,
        PRIMARY KEY (`id_container`)
        )
        ENGINE = memory;

    INSERT INTO innerContainers(id_container, display_name)
    (SELECT c1.id_container, c1.display_name 
     FROM container_presentation cp
     LEFT JOIN presentation p USING(id_presentation)
     LEFT JOIN container c1 ON p.id_container = c1.id_container
     WHERE c1.isDeleted = 0 AND c1.isActive = 1 AND
             cp.id_container = in_id_container)
    UNION
    (SELECT c1.id_container, c1.display_name 
     FROM container_assembly_item cp
     LEFT JOIN presentation p USING(id_presentation)
     LEFT JOIN container c1 ON p.id_container = c1.id_container
     WHERE c1.isDeleted = 0 AND c1.isActive = 1 AND
           cp.id_container = in_id_container);

    SELECT mad.id_container,
             mat.sign_stock, 
             ma.id_management_start_point,  
             ma.id_management_end_point,
             mad.quantity
    FROM management_activity ma
    LEFT JOIN management_activity_type mat ON ma.id_management_activity_type = mat.id_management_activity_type
    LEFT JOIN management_activity_detail mad ON ma.id_management_activity = mad.id_management_activity
    LEFT JOIN management_stock_point msp ON ma.id_management_end_point = msp.id_management_stock_point
    LEFT JOIN management_stock_point msp1 ON ma.id_management_start_point = msp1.id_management_stock_point
    WHERE mad.id_container IN (SELECT id_container FROM innerContainers)
    ORDER BY mad.id_container ASC;
END

现在，在最后一次查询之后..我需要做一些操作，并根据第二个查询中的值为临时表中的每个id_container返回一个值。像这样：

在第二个查询中的foreach id_container我有一个resultValue，我需要：

如果sign_stock == 1和其他一些条件，那么resultValue - = quantity，如果sign_stock == 2和其他一些条件，那么resultValue + = quantity。迭代id_container行之后的最终resultValue将是我想要的临时表中的id_container。我不知道怎么做这个操作..有人可以帮我吗？

Answer 1

除非在过程调用后需要数据，否则不要创建临时表。无论哪种方式，为了迭代SELECT查询的结果，请使用CURSOR。

链接的手册页中提供了一个简单的例子。

在存储过程内的查询中使用值进行操作（mysql）

1 个答案: