如果不符合條件，則阻止在SQL中刪除語句

我的場景是：我在SQL中有兩個表格，一個是標題，另一個是詳細信息。在標題中刪除記錄時，我想要刪除記錄的詳細信息。在我實際刪除細節之前，我正在做一些檢查。如果不符合條件，則阻止在SQL中刪除語句

我的問題是，當我執行檢查時，我正在基於要刪除的記錄加入Header表，不幸的是，當我這樣做時，標題已被用戶的語句刪除。

如何防止標題被刪除，如果它不符合必要的標準。例如，對於Header表：

Key  | Status 
------------------- 
001  | 00 
002  | 00 
003  | 40

我的DELETE語句：

DELETE FROM HEADER WHERE KEY = '003'

在我刪除觸發之前，我刪除我檢查，以確保狀態< 40的細節。如果不是這種情況我拋出一個錯誤，我怎麼能爲Header做同樣的事情？

我的代碼如下：

ALTER TRIGGER [dbo].[trg_PO_DELETE] 

ON PO 

AFTER DELETE 

AS 

DECLARE 
    @Date     DATETIME 
    , @Who     VARCHAR(20) 
    , @ProcessedStatus  CHAR(2) 
    , @ProcessingStatus  CHAR(2) 
    , @ShmtType    INT 
    , @POType    INT 
    , @MsgNo    INT 
    , @Msg     VARCHAR(MAX) 
    , @Continue    INT 

SET @Date     = CURRENT_TIMESTAMP 
SET @Who     = SYSTEM_USER 
SET @ProcessedStatus  = '90' 
SET @ProcessingStatus  = '40' 
SET @ShmtType    = 3 
SET @POType     = 1 
SET @MsgNo     = 0 
SET @Msg     = '' 
SET @Continue    = 0 



IF EXISTS(SELECT 1 FROM PO(NOLOCK) 
       JOIN DELETED ON PO.po_asn_number = DELETED.po_asn_number 
          AND PO.po_customer_id = DELETED.po_customer_id 
          AND PO.po_number = DELETED.po_number 
          AND PO.po_type = DELETED.po_type 
          AND PO.po_status = DELETED.po_status 
      WHERE PO.po_status < @ProcessingStatus) 
    BEGIN 
     /* REMOVE SHIPMENT DETAIL WHEN SHIPMENT HEADER IS DELETED */ 
     DELETE PO_DETAIL 
     FROM PO_DETAIL 
     JOIN DELETED ON PO_DETAIL.pd_asn_number = DELETED.po_asn_number 
        AND PO_DETAIL.pd_customer_id = DELETED.po_customer_id 
        AND PO_DETAIL.pd_po_number = DELETED.po_number 
        AND PO_DETAIL.pd_type = DELETED.po_type 

     /* REMOVE UCC FOR SHIPMENT WHEN SHIPMENT IS DELETED*/ 
     DELETE UCC 
     FROM UCC 
     JOIN DELETED ON UCC.cs_shipment_number = DELETED.po_asn_number 
        AND UCC.cs_po_number = DELETED.po_number 
        AND DELETED.po_type = @ShmtType 

     /* UPDATE PO LEVEL INFORMATION */ 
     UPDATE PO 
       SET PO.po_shipped_qty = PO.po_shipped_qty - DELETED.po_shipped_qty 
       , PO.po_received_qty = PO.po_received_qty - DELETED.po_received_qty 
     FROM PO 
     JOIN DELETED ON PO.po_asn_number = DELETED.po_number 
        AND PO.po_number = DELETED.po_number 
        AND PO.po_customer_id = DELETED.po_customer_id 
        AND DELETED.po_type = @POType 
    END 
ELSE 
    BEGIN 
     SET @Continue = 1 
     SET @MsgNo = 50000 
     SET @Msg = dbo.fnc_GetMessage(@MsgNo) 
    END 
IF @Continue=1 -- Error Occured 
    BEGIN 
     RAISERROR @MsgNo @Msg 
     RETURN 
    END

我想我的問題是，因爲頭記錄消失之前，我可以做加盟。您可能提供的任何幫助將非常有幫助。

來源

2013-08-26 jorame

都裹在交易中，做一個ROLLBACK如有錯誤拋出。這就是交易的目的。 – RBarryYoung

謝謝。我將添加交易計數以及INSTEAD OF DELETE – jorame

嘗試使用INSTEAD OF DELETE觸發，這樣的事情：

CREATE TRIGGER TEST1 
ON DBO.HEADER 
INSTEAD OF DELETE 
AS 
    BEGIN 
     DELETE H 
     FROM HEADER H 
      INNER JOIN DELETED d 
        ON H.[KEY] = d.[KEY] 
         AND H.STATUS < 40 
    END 

GO

來源

2013-08-26 19:32:45 Gidil

如果不符合條件，則阻止在SQL中刪除語句

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