即使循环中发生错误如何继续游标循环

我想将一个表的行插入到另一个表中。为此，我有以下程序。

ALTER PROCEDURE LOADDATA_a
AS 
BEGIN

TRUNCATE TABLE STIDENT_A
DECLARE @SID INT
DECLARE @SNAME VARCHAR(50)
DECLARE @SUB VARCHAR(50)
DECLARE @MARKS INT

DECLARE LOAD_DATA CURSOR FAST_FORWARD FOR  
SELECT SID,SNAME,SUB,MARKS 
FROM student 

OPEN LOAD_DATA   
FETCH NEXT FROM LOAD_DATA INTO @SID,@SNAME,@SUB,@MARKS

WHILE @@FETCH_STATUS = 0   
BEGIN
    BEGIN TRANSACTION

    INSERT INTO STIDENT_A(SID,SNAME,SUB,MARKS) VALUES (@SID,@SNAME,@SUB,@MARKS)

    IF @@ERROR != 0
    BEGIN
        ROLLBACK TRANSACTION
        RETURN
    END
    ELSE
    BEGIN
        COMMIT TRANSACTION
    END
    FETCH NEXT FROM LOAD_DATA INTO @SID,@SNAME,@SUB,@MARKS
END

CLOSE LOAD_DATA   
DEALLOCATE LOAD_DATA

END

每当插入一行失败时，游标就会失败并停在那里，但我需要它继续。怎么做？

显然，你有一个RETURN紧随其后的声明ROLLBACK TRANSACTION。您是否尝试过将其删除？

虽然你也可以使用重写主体TRY/CATCH相反，像这样：

...
WHILE @@FETCH_STATUS = 0   
BEGIN
    BEGIN TRY
        INSERT INTO STIDENT_A(SID,SNAME,SUB,MARKS)
        VALUES (@SID,@SNAME,@SUB,@MARKS);
    END TRY
    BEGIN CATCH
      -- this section must have some statement,
      -- so, why not log the erroneous data to the screen at least?
      PRINT @SID;
      PRINT @SNAME;
      PRINT @SUB;
      PRINT @MARKS;
      PRINT '';  -- an empty line as a delimiter
      -- or, perhaps, into a table?
      --INSERT INTO SomeFailLog (SID,SNAME,SUB,MARKS)
      --VALUES (@SID,@SNAME,@SUB,@MARKS);
    END CATCH;
    FETCH NEXT FROM LOAD_DATA INTO @SID,@SNAME,@SUB,@MARKS;
END;
...

但是，如果您知道具体是什么可能导致插入失败，那么最好提出一个仅生成要插入的有效数据的语句。

例如，如果问题是某些 SIDstudent已经存在于STIDENT_A并且您需要忽略它们，您可以简单地尝试以下操作而不是你的程序:

INSERT INTO STIDENT_A (SID, SNAME, SUB, MARKS)
SELECT s.SID, s.SNAME, s.SUB, s.MARKS
FROM student AS s
LEFT JOIN STIDENT_A AS a ON s.SID = a.SID
WHERE a.SID IS NULL
;

如果您具体说明传输数据时可能出现的问题，我们也许能够帮助您找到专门针对该问题的最有效的解决方案。

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