Question

      if while loop also having a break, if while loop hit break command  i t comes out of the loop and  if cursor hit break  command ,  how it come entire  out of the while loop

        for example: 
        DECLARE @CursorTest TABLE 
        (
        idcol INT ,
        fld1 INT,
        fld2 INT,
        fld3 CHAR(800)
        )

        INSERT INTO @CursorTest (fld1, fld2, fld3)

        SELECT 1, RAND() * 100 * DATEPART(ms, GETDATE()), LEFT(REPLICATE(CAST(NEWID() AS VARCHAR(36)),30),800)


        DECLARE @Variable1 INT, @Variable2 INT
        DECLARE CursorName CURSOR FAST_FORWARD
        FOR
        SELECT idcol    FROM @CursorTest    
        OPEN CursorName
        FETCH NEXT FROM CursorName  INTO @Variable1
        WHILE @@FETCH_STATUS = 0
        BEGIN


            if (@Variable1 =10) 
            BEGIN
                BREAK
            END 
            PRINT CAST(@Variable1 AS VARCHAR(5))



        FETCH NEXT FROM CursorName  INTO @Variable1

        END
        CLOSE CursorName
        DEALLOCATE CursorName



    if cursor hit break  command ,  how it come entire  out of the while loop

如果while循环也有一个中断，如果while循环命中中断命令我退出循环并且如果光标命中中断命令，那么它是如何完全退出while循环的

Answer 1

你可以在WHILE循环中给出一些迭代光标的条件。第一个条件是@@FETCH_STATUS，其他条件就是你要打破循环

WHILE @@FETCH_STATUS = 0 OR @stopLoop = false
   BEGIN
      FETCH NEXT FROM Employee_Cursor;
      //your code
      if condition 
      BEGIN
          @stopLoop = true
      END 
   END;
CLOSE Employee_Cursor;

使用BREAK语句

WHILE @@FETCH_STATUS = 0 
   BEGIN
      FETCH NEXT FROM Employee_Cursor;
      //your code
      if condition 
      BEGIN
          BREAK
      END 
   END;
CLOSE Employee_Cursor;

Answer 2

我的代码如下:: DECLARE @ Variable1 INT，@ Variable2 INT DECLARE CursorName CURSOR FAST_FORWARD 对于 SELECT idcol

FROM CursorTest
OPEN CursorName
FETCH NEXT FROM CursorName

INTO @Variable1
WHILE @@FETCH_STATUS = 0
BEGIN
PRINT CAST(@Variable1 AS VARCHAR(5))
FETCH NEXT FROM CursorName
INTO @Variable1
END
CLOSE CursorName
DEALLOCATE CursorName

如果光标命中了break命令，那么它是如何完成while循环的

如何在while循环中手动中断游标。在sql server中

2 个答案: