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我正在寻求使用 MS SQL 游标或 SQL while 循环的指导，以根据以下标准使用单个表合并（添加、更新和设置非活动）行，从而寻求最终数据集：

表视图（从表中选择 * 实体 = 123 (@ID)

ENTITY     ENTITY_TYPE    值     STATUS_TYPE

123 1 1 1
123 1 4 1
123 1 9 1


表视图（从表中选择 * 实体 = 456 (@OverrideID)

实体    ENTITY_TYPE    值    STATUS_TYPE
456 1 1 1
456 1 5 1

最终数据集如下：

实体   类型    值    STATUS_TYPE

123 1 1 3
123 1 4 3
123 1 9 3
456 1 1 1
456 1 4 1
456 1 9 1
456 1 1 1
456 1 5 1

-- 检查并比较每一行
-- IF @OverrideID = @ID (MATCH)
----- 将@ID 设置为非活动保留副本
-- If @OverrideID != @ID (NOT MATCH)
----- 使用@OverrideID (COPY) 插入@ID 数据
----- 将@ID 设置为非活动.

我开始写以下内容并需要帮助。作为参考，@ID = 123 和 @OverrideID = 456

DECLARE @ENTITY BIGINT, @ENTITY_TYPE BIGINT, @VALUE BIGINT, @E1 BIGINT, @T1 BIGINT, @V1 BIGINT
DECLARE type_cursor CURSOR LOCAL FAST_FORWARD FOR
SELECT * FROM TypeValue WHERE ENTITY = @ID

SET NOCOUNT OFF
OPEN type_cursor

FETCH NEXT FROM type_cursor INTO @OverrideID, @ID, @ENTITY, @ENTITY_TYPE, @VALUE

WHILE (@@FETCH_STATUS = 0)
    BEGIN

        SELECT @ENTITY, @ENTITY_TYPE, @VALUE

     IF @VALUE IS NOT NULL
        BEGIN
        SELECT @T1 = @ENTITY_TYPE, @V1 = @VALUE
        END
    ELSE
    BEGIN
    UPDATE TypeValue
    SET ENTITY = @OverrideID, ENTITY_TYPE = @T1, VALUE = @V1 WHERE ENTITY = @ID
    END

FETCH NEXT FROM type_cursor INTO @OverrideID, @ID, @ENTITY, @ENTITY_TYPE, @VALUE

END

CLOSE type_cursor 
DEALLOCATE type_cursor 
SET NOCOUNT OFF
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1 回答 1

1

最终结果集看起来像

    select entity,entity_type,value,3 status_type
      from [table]
     where entity = @id
 union all
    select @override,entity_type,value,status_type
      from [table]
     where entity = @id
 union all
    select entity,entity_type,value,status_type
      from [table]
     where entity = @override
于 2012-10-11T23:09:25.933 回答