游标的使用

 1   DECLARE cursor_timeformatter CURSOR LOCAL FOR 
 2   SELECT ID, PublishTime FROM Book_BaseFields
 3   OPEN cursor_timeformatter
 4   DECLARE @ID int
 5   DECLARE @PublishTime nvarchar(50)
 6   WHILE @@FETCH_STATUS=0
 7   BEGIN
 8   FETCH NEXT FROM cursor_timeformatter INTO @ID, @PublishTime
 9   IF((Len(@PublishTime)-Len(Replace(@PublishTime,'-','')))=2)
10     BEGIN
11      UPDATE Book_BaseFields SET PublishTime = CONVERT(varchar(100),CAST(@PublishTime as DATETIME),23) WHERE ID=@ID
12     END
13   ELSE IF((Len(@PublishTime)-Len(Replace(@PublishTime,'-','')))=1)
14     BEGIN
15      IF(LEN(SUBSTRING(@PublishTime,6,2))=1)
16        BEGIN
17         UPDATE Book_BaseFields SET PublishTime = SUBSTRING(@PublishTime,1,5)+'0'+SUBSTRING(@PublishTime,6,2) WHERE ID=@ID
18        END
19     END
20   END
21   CLOSE cursor_timeformatter
22   DEALLOCATE cursor_timeformatter
23   GO