SQL Server：触发器停止工作

Question

我在桌面上创建了一个触发器，这是我的第一次。

当一条记录被插入到我的TableA中时，触发器会向同一个TableA插入一条新记录。

1. 当我插入符合语句中设置的条件的记录时，触发器会正确动作。

2. 当我插入一条不符合这些条件的记录时，触发器无法执行。

3. 问题是，如果我现在再添加一条符合条件的新记录，那么触发器就不再被执行。当我插入不符合条件的记录时，它似乎停止工作。

如果我删除了第2点中添加的条件未满足条件的记录，则它再次开始工作。奇怪，无法理解。有什么建议吗？

情景：当客户第一次购买属于StockType=1的商品时，新商品将被添加到同一张发票中。它工作正常。

如果客户购买不属于StockType=1的其他产品，则不会触发该触发器。这很好。

之后，触发器将不会再次被执行。这是原始的语句代码。

SET NOCOUNT ON;  
DECLARE @SerialNo NVARCHAR(50) 

    SET @SerialNo = (SELECT TOP 1 SNSerialNoTx 
        FROM T_SNSerialNo 
        WHERE (SNStockItemID = 7058 AND SNInvoiceID_N IS NULL)) 

    INSERT INTO T_IIInvoiceItem (IIInvoiceID, IIProfitCenterID, IIStockItemID, IISerialNoTx_N, 
           IIQtyIn, IICostPriceCompsTx, IITaxBandIDsTx, IITaxRatesTx, 
           IIStockNoTx, IIStockItemTx, IIStockTypeID, IIStockTypeTx, 
           IIManufacturerID, IIManufacturerTx, IICustID) 

     SELECT 
      IIInvoiceID, 23, 7058, @SerialNo, 
      IIStockTypeID, '-1:1@0', 0, 0, 
      'Training.EUCS', 
      (SELECT 'Online Training (SN:'+@SerialNo+')'), 40,'Online Training', 7, 'Company', IICustID 
      FROM inserted 
      WHERE IIStockTypeID = 1 
       AND IICustID IN (SELECT IICustID 
           FROM T_IIInvoiceItem 
           INNER JOIN T_InInvoice ON InInvoiceID = IIInvoiceID 
           INNER JOIN T_CuCust ON CuCustID = IICustID 
           WHERE IIStockTypeID = 1 AND InTransStatusID = 0 
           GROUP BY IICustID 
           HAVING COUNT(IICustID) = 1) 

触发代码

ALTER TRIGGER [dbo].[SerialTrigger] 
    ON [dbo].[T_IIInvoiceItem] 
    AFTER INSERT 

Answer 1

试试这个（每@DeepDiver）：

SET NOCOUNT ON; 

--********************************************** 
SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED 
--********************************************** 

DECLARE @SerialNo NVARCHAR(50) 

    -- ----------------------------------------------------- 
    SELECT TOP 1 @SerialNo = SNSerialNoTx 
    FROM T_SNSerialNo 
    WHERE SNStockItemID = 7058 
     AND SNInvoiceID_N IS NULL ; 

    -- ----------------------------------------------------- 
    ; WITH ins 
    AS (
     SELECT IIInvoiceID, IIStockTypeID, IICustID 
     FROM Inserted 
     WHERE IIStockTypeID = 1 
      AND IICustID IN (
       SELECT IICustID 
       FROM T_IIInvoiceItem 
        INNER JOIN T_InInvoice ON InInvoiceID = IIInvoiceID 
        INNER JOIN T_CuCust ON CuCustID = IICustID 
       WHERE IIStockTypeID = 1 
        AND InTransStatusID = 0 
       GROUP BY IICustID 
       HAVING COUNT(IICustID) = 1 
       ) 
     ) 
    -- ----------------------------------------------------- 
    INSERT INTO T_IIInvoiceItem (IIInvoiceID, IIProfitCenterID, IIStockItemID, IISerialNoTx_N, 
           IIQtyIn, IICostPriceCompsTx, IITaxBandIDsTx, IITaxRatesTx, 
           IIStockNoTx, IIStockItemTx, IIStockTypeID, IIStockTypeTx, 
           IIManufacturerID, IIManufacturerTx, IICustID) 
    SELECT 
     IIInvoiceID 
     , 23 
     , 7058 
     , @SerialNo 
     , IIStockTypeID 
     , '-1:1@0' 
     , 0 
     , 0 
     , 'Training.EUCS' 
     , 'Online Training (SN:'+@SerialNo+')' 
     , 40 
     ,'Online Training' 
     , 7 
     , 'Company' 
     , IICustID 
    FROM ins