Question

我尝试通过游标获取数据，例如下面的代码，但得到错误：

名为＆＃39; MY_CURSOR＆＃39;的光标已经存在。

我搜索并发现我应该在游标定义中使用LOCAL字，例如DECLARE MY_CURSOR LOCAL CURSOR，但会再次出错

DECLARE CURSOR语句中本地选项的使用无效。

我该如何解决这个问题？

DECLARE @tag AS NVARCHAR(1000)
DECLARE @tempTbl AS TABLE (tagcol NVARCHAR(1000))
DECLARE MY_CURSOR LOCAL CURSOR 
FOR
    SELECT bt.Tag
    FROM   BlogTable AS bt
    WHERE  bt.IsEnglish = 0
           AND bt.IsActive = 1
           AND bt.IsDelete = 0

OPEN MY_CURSOR   
FETCH NEXT FROM MY_CURSOR INTO @tag
WHILE @@FETCH_STATUS = 0
BEGIN
    INSERT INTO @tempTbl
    SELECT *
    FROM   dbo.FunSpliteStr(@tag, '،') 

    FETCH NEXT FROM MY_CURSOR INTO @tag
END

CLOSE MY_CURSOR 
DEALLOCATE MY_CURSOR

SELECT tagcol
FROM   @tempTbl AS tt
GROUP BY
       tt.tagcol

Answer 1

非游标查询

SELECT *
FROM   BlogTable AS bt
       CROSS APPLY dbo.FunSpliteStr(bt.Tag, '،') 
WHERE  bt.IsEnglish = 0
       AND bt.IsActive = 1
       AND bt.IsDelete = 0

Answer 2

我同意上面Larnu的评论。我将删除上面的光标并改为使用交叉应用。请看一下。

SELECT
  bt.Tag,
  *
FROM BlogTable AS bt
CROSS APPLY dbo.FunSpliteStr(bt.Tag, '،') FS
WHERE bt.IsEnglish = 0
AND bt.IsActive = 1
AND bt.IsDelete = 0

如果您仍然觉得“需要”游标，请先尝试单独运行close和deallocate语句，然后再次尝试运行while查询。

Answer 3

尝试这个：这也是一种做法

DECLARE @tag AS NVARCHAR(MAX)

SELECT @tag = COALESCE(@tag + ',', '') + bt.Tag
FROM   BlogTable AS bt
WHERE  bt.IsEnglish = 0
        AND bt.IsActive = 1
        AND bt.IsDelete = 0

SELECT *
FROM dbo.FunSpliteStr(@tag, '،')

Answer 4

虽然每个人都说你不需要光标（因此你不应该使用它），但回答你的实际问题：你应该在{{1}之后指定LOCAL | GLOBAL } keyword：

CURSOR

一个名为＆＃39; MY_CURSOR＆＃39;的游标。已经存在

4 个答案: