弹出警报消息时如何在SQL存储过程中停止事务

Question

基于下面的C＃代码，我在inv_qty == 2时在SQL存储过程中编写了语句，以弹出警报消息。

但是在显示警报消息后。数据事务已被记录。如果弹出警报消息，如何停止事务？

据我所知，如果编写语句，SQL存储过程无法停止事务，我该如何实现呢？

 float INV_QTY = Convert.ToInt32(_cmd.Parameters["@RecordFound"].Value.ToString());
                   if (INV_QTY == 2)
                 {
         ScriptManager.RegisterStartupScript(this, this.GetType(), "Message", "alert('" + Item + " Qty is more than exist Qty');window.location.href = 'MMS_Issue.aspx';", true);
                    }
    USE [CIMProRPT01]
     GO
    SET ANSI_NULLS ON
     GO
   SET QUOTED_IDENTIFIER ON
       GO
     ALTER PROCEDURE [dbo].[MMSIssue_InsertOrUpdate] 
     @INV_TRANS_ID VARCHAR(40)
     ,@INV_ID VARCHAR(40)
      ,@INV_LOCATION VARCHAR(40) 
      ,@INV_QTY FLOAT
      ,@INV_TRANS_REQUESTOR VARCHAR(40)
      ,@INV_TRANS_REFNO VARCHAR(40)
      ,@INV_TRANS_REMARK VARCHAR(255)
      ,@INV_REASON_ID VARCHAR(40)
     ,@INV_REASON_REMARK VARCHAR(255)
      ,@INV_CREATE_DATE DATETIME
       ,@INV_CREATE_USER VARCHAR (255)

       ,@INV_FROMLOC VARCHAR (40)
        ,@RecordFound INT OUTPUT
      AS
         BEGIN
      SET NOCOUNT ON;

IF EXISTS(SELECT * FROM OTH_INV_QTY_LOC WHERE INV_ID = @INV_ID and INV_LOCATION = @INV_LOCATION)
BEGIN
    UPDATE OTH_INV_QTY_LOC SET [INV_ID] = @INV_ID,INV_LOCATION = @INV_LOCATION , INV_QTY = INV_QTY - @INV_QTY WHERE INV_ID = @INV_ID AND INV_LOCATION = @INV_LOCATION

    INSERT INTO OTH_INV_TRANSACTION (INV_TRANS_ID,INV_ID,INV_TRANS_LOCATION,INV_TRANS_QTY,INV_TRANS_REQUESTOR,INV_TRANS_REFNO,INV_TRANS_REMARK,INV_REASON_ID,INV_REASON_REMARK,INV_CREATE_DATE,INV_CREATE_USER,INV_FROMLOC)VALUES (@INV_TRANS_ID,@INV_ID,@INV_LOCATION,@INV_QTY,@INV_TRANS_REQUESTOR,@INV_TRANS_REFNO,@INV_TRANS_REMARK,@INV_REASON_ID,@INV_REASON_REMARK,@INV_CREATE_DATE,@INV_CREATE_USER,@INV_FROMLOC)


    DECLARE  @InvFindQTY FLOAT SET @InvFindQTY = ( SELECT INV_QTY FROM OTH_INV_QTY_LOC)

    IF  @InvFindQTY >= @INV_QTY 
    BEGIN
        SELECT @RecordFound = 2
    END
ELSE
    BEGIN
        SELECT @RecordFound = 1
    END
END
      ELSE 
      BEGIN
           SELECT @RecordFound = 0
   END
         END

Answer 1

您无法暂停已启动的交易，您需要将您的程序分成两部分，并在弹出后或您想要的任何条件下调用第二部分。

如果要回滚事务，则分别使用BEGIN TRAN和COMMIT / ROLLBACK。 .NET 事务也可用于回滚。

Answer 2

你when inv_qty == 2但是你的程序返回@RecordFound ，根据我对sql的理解，如果@InvFindQTY >= @INV_QTY并且proc返回@RecordFound = 2一切都很好

• 值@INV_QTY将传递给过程
• 如果条件inv_id = @INV_ID AND inv_location = @INV_LOCATION ，则表oth_inv_qty_loc的列inv_qty更新为inv_qty = inv_qty - @INV_QTY
• 更新后检索@InvFindQTY = (SELECT inv_qty FROM oth_inv_qty_loc)值
• 和@RecordFound被设置为根据@InvFindQTY >= @INV_QTY

所以基本上你似乎可以在事务中包装语句并仅在inv_qty >= @INV_QTY更新表，这意味着当前股票是否大于或等于某人想要从股票中取出的金额@INV_QTY 。

Answer 3

ALTER PROCEDURE [dbo].[MMSIssue_InsertOrUpdate]
    @INV_TRANS_ID VARCHAR(40)
    ,@INV_ID VARCHAR(40)
    ,@INV_LOCATION VARCHAR(40) 
    ,@INV_QTY FLOAT
    ,@INV_TRANS_REQUESTOR VARCHAR(40)
    ,@INV_TRANS_REFNO VARCHAR(40)
    ,@INV_TRANS_REMARK VARCHAR(255)
    ,@INV_REASON_ID VARCHAR(40)
    ,@INV_REASON_REMARK VARCHAR(255)
    ,@INV_CREATE_DATE DATETIME
    ,@INV_CREATE_USER VARCHAR (255)
    ,@INV_FROMLOC VARCHAR (40)
    ,@RecordFound INT OUTPUT
AS
BEGIN
    SET NOCOUNT ON;

    IF EXISTS(SELECT * 
        FROM OTH_INV_QTY_LOC 
        WHERE INV_ID = @INV_ID 
            AND INV_LOCATION = @INV_LOCATION)
    BEGIN
        BEGIN TRY   
            -- start the transaction
            BEGIN TRANSACTION 

            UPDATE OTH_INV_QTY_LOC 
            SET [INV_ID] = @INV_ID,INV_LOCATION = @INV_LOCATION , INV_QTY = INV_QTY - @INV_QTY 
            WHERE INV_ID = @INV_ID AND INV_LOCATION = @INV_LOCATION

            -- you can start the transaction from here
            -- BEGIN TRANSACTION 

            INSERT INTO OTH_INV_TRANSACTION (INV_TRANS_ID,INV_ID,INV_TRANS_LOCATION,INV_TRANS_QTY,INV_TRANS_REQUESTOR,INV_TRANS_REFNO,INV_TRANS_REMARK,INV_REASON_ID,INV_REASON_REMARK,INV_CREATE_DATE,INV_CREATE_USER,INV_FROMLOC)
            VALUES (@INV_TRANS_ID,@INV_ID,@INV_LOCATION,@INV_QTY,@INV_TRANS_REQUESTOR,@INV_TRANS_REFNO,@INV_TRANS_REMARK,@INV_REASON_ID,@INV_REASON_REMARK,@INV_CREATE_DATE,@INV_CREATE_USER,@INV_FROMLOC)

            DECLARE  @InvFindQTY FLOAT 
            SET @InvFindQTY = ( SELECT INV_QTY FROM OTH_INV_QTY_LOC)

            IF  @InvFindQTY >= @INV_QTY 
            BEGIN
                SELECT @RecordFound = 2;
                THROW 51000, '@RecordFound = 2', 1; 
            END
            ELSE
            BEGIN
                SELECT @RecordFound = 1
            END
        END TRY
        BEGIN CATCH         
            ROLLBACK TRANSACTION            
        END CATCH

        -- Commit the transaction 
        IF XACT_STATE() = 1 COMMIT TRANSACTION 
        -- For safety
        ELSE IF XACT_STATE() = -1 ROLLBACK TRANSACTION 
    END
    ELSE 
    BEGIN
        SELECT @RecordFound = 0
    END
END