哪位高手看下这个存储过程，为什么进入了IF，求解。是不是@@ERROR用的有有关问题

谁看下这个存储过程，为什么进入了IF，求解。是不是@@ERROR用的有问题？

SQL code

BEGINSELECT @OrderRowCount = COUNT(*) FROM T_ORDER T WHERE T.DispOrderStatus != @CancelStatus AND T.DispOrderStatus!=@SuccessStatus  AND sellUserID=@sellUserIDAND TRADE_TYPE=@TradeTypeIF(@OrderRowCount>0)     SET @ReturnValue= -1SELECT @rowCountArbitrate = COUNT(*) from T_ORDER T WHERE T.Arbitrate = 6 AND t.sellUserID=@sellUserID AND t.TRADE_TYPE=@TradeTypeIF @rowCountArbitrate>0    set @ReturnValue = -3if exists (SELECT * FROM T_ORDER t WHERE t.sellUserID=@sellUserID AND t.DispOrderStatus =@SuccessStatus  AND t.TRADE_TYPE=@TradeType AND t.ORDER_DATE>@date)    set @ReturnValue = -4  --可以保证，执行到这里的时候 @ReturnValue = -1，但为什么还会进入这个IF执行下面的，并且最后给我返回一个1--是不是我@@ERROR用的有问题。IF(@ReturnValue = 0 OR @ReturnValue IS NULL)        UPDATE T_CARD_STOCK SET [status] = @ShelfStatus WHERE [uid]=@sellUserID             IF(@@ERROR = 0)                SET @ReturnValue = 1  --最后执行到了这里            ELSE                SET @ReturnValue = -2 return @ReturnValue END

SQL code

BEGINSELECT @OrderRowCount = COUNT(*) FROM T_ORDER T WHERE T.DispOrderStatus != @CancelStatus AND T.DispOrderStatus!=@SuccessStatus  AND sellUserID=@sellUserIDAND TRADE_TYPE=@TradeTypeIF(@OrderRowCount>0)     SET @ReturnValue= -1SELECT @rowCountArbitrate = COUNT(*) from T_ORDER T WHERE T.Arbitrate = 6 AND t.sellUserID=@sellUserID AND t.TRADE_TYPE=@TradeTypeIF @rowCountArbitrate>0    set @ReturnValue = -3if exists (SELECT * FROM T_ORDER t WHERE t.sellUserID=@sellUserID AND t.DispOrderStatus =@SuccessStatus  AND t.TRADE_TYPE=@TradeType AND t.ORDER_DATE>@date)    set @ReturnValue = -4 print @ReturnValue --看下结果 --可以保证，执行到这里的时候 @ReturnValue = -1，但为什么还会进入这个IF执行下面的，并且最后给我返回一个1--是不是我@@ERROR用的有问题。IF(@ReturnValue = 0 OR @ReturnValue IS NULL)BEGIN        UPDATE T_CARD_STOCK SET [status] = @ShelfStatus WHERE [uid]=@sellUserID             IF(@@ERROR = 0)                SET @ReturnValue = 1  --最后执行到了这里            ELSE                SET @ReturnValue = -2 END  -- tryreturn @ReturnValue END