Tsql 如何在WHILE EXISTS（）循环中分配变量

我希望遍历满足特定条件的表行。在每次迭代中，我想将当前行的两个值赋给一个变量。到目前为止，我得到的是：

    WHILE EXISTS(SELECT TOP 1 *
FROM [Communications] c
WHERE [communicationTypeID] = 2
AND [status] = 0)

SET @communicationId = c.[id]
SET @message = c.[Message]
BEGIN
....

它显示一个错误：

Msg 4104, Level 16, State 1, Line 25
The multi-part identifier "c.id" could not be bound.
Msg 4104, Level 16, State 1, Line 26
The multi-part identifier "c.Message" could not be bound.

有人能告诉我正确的方向吗？我对SQL很陌生。 先谢谢你。 Peter

看起来应该是：（小心点，不要运行无限循环…在while循环中正确更新你的东西中的通信，或者在你的东西之后删除id）

或者您可以使用光标：

DECLARE ExampleCursor CURSOR FOR
    SELECT [id], [Message]
        FROM [Communications] c
        WHERE [communicationTypeID] = 2
              AND [status] = 0

OPEN ExampleCursor
FETCH NEXT FROM ExampleCursor INTO @communicationId,@message

WHILE @@FETCH_STATUS = 0
BEGIN

/*do your stuff here by using @communicationId and @message for example*/ 
INSERT INTO NextTable (addParams)
SELECT addParams
FROM [Communications]
WHERE id = @communicationId

END


CLOSE ExampleCursor;
DEALLOCATE ExampleCursor;

---

改为使用快进游标，直到@@fetch\u STATUS=0为止（本文中的好例子B）

DECLARE ExampleCursor CURSOR FOR
    SELECT [id], [Message]
        FROM [Communications] c
        WHERE [communicationTypeID] = 2
              AND [status] = 0

OPEN ExampleCursor
FETCH NEXT FROM ExampleCursor INTO @communicationId,@message

WHILE @@FETCH_STATUS = 0
BEGIN

/*do your stuff here by using @communicationId and @message for example*/ 
INSERT INTO NextTable (addParams)
SELECT addParams
FROM [Communications]
WHERE id = @communicationId

END


CLOSE ExampleCursor;
DEALLOCATE ExampleCursor;