Question

我正在寻求使用MS SQL游标或SQL while循环来根据以下条件使用单个表合并（添加，更新和设置非活动）行，从而导致寻找最终数据集：

表视图（SELECT * FROM TABLE WHERE ENTITY = 123（@ID）

ENTITY ENTITY_TYPE VALUE STATUS_TYPE

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

表视图（SELECT * FROM TABLE WHERE ENTITY = 456（@OverrideID）

ENTITY ENTITY_TYPE VALUE STATUS_TYPE
456 1 1 1
456 1 5 1

下面的最终数据集：

ENTITY TYPE VALUE 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设置为非活动保持副本
- 如果@OverrideID！= @ID（不匹配）
-----使用@OverrideID（COPY）插入@ID数据
-----将@ID设置为无效。

我开始撰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

Answer 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

使用光标更新单个表中的行

1 个答案: