循环批量更新的的存储过程(属于转载)

CREATE PROCEDURE  addusermodule
    @ModuleId_Array  varChar(2000),
    @UserId int
 AS
    DECLARE  @PointerPrev int
    DECLARE @PointerCurr  int
    DECLARE  @TId int
    Set @PointerPrev=1 
    set  @PointerCurr=1
    
    begin transaction 
    Set NoCount  ON
    delete  from tests where userid=@UserId 
    
    Set @PointerCurr=CharIndex (',',@ModuleId_Array ,@PointerPrev+1)
    set @TId=cast (SUBSTRING(@ModuleId_Array,@PointerPrev ,@PointerCurr-@PointerPrev)  as int)
    Insert into tests (userid,moduleid)  Values(@UserId,@TId)
    SET @PointerPrev =  @PointerCurr
    while  (@PointerPrev+1  < LEN(@ModuleId_Array))
    Begin
        Set  @PointerCurr=CharIndex( ',',@ModuleId_Array, @PointerPrev+1)
        if(@PointerCurr> 0)
        Begin
            set @TId=cast (SUBSTRING(@ModuleId_Array,@PointerPrev +1,@PointerCurr- @PointerPrev-1) as  int)
            Insert into tests (userid,moduleid) Values (@UserId,@TId)
            SET @PointerPrev =  @PointerCurr
        End 
        else
            Break
    End 
    
    set @TId=cast(SUBSTRING(@ModuleId_Array,@PointerPrev+ 1,LEN(@ModuleId_Array )-@PointerPrev) as  int)
    Insert into tests (userid,moduleid) Values (@UserId,@TId)

   delete from tests  where moduleid =0 
    Set NoCount OFF
    if @@error= 0
    begin
       commit transaction
    end
    else 
    begin
        rollback transaction
   end
GO

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