在SQL Server触发器中登录表 [英] Logging into table in SQL Server trigger

问题描述

我正在编码SQL Server 2005触发器。我想在触发器执行过程中使用INSERT语句到日志表中进行一些记录。当执行过程中发生错误时，我想提出错误并取消导致触发器执行的操作，但不要丢失日志记录。最好的方法是什么？

I am coding SQL Server 2005 trigger. I want to make some logging during trigger execution, using INSERT statement into my log table. When there occurs error during execution, I want to raise error and cancel action that cause trigger execution, but not to lose log records. What is the best way to achieve this?

现在，由于发生ROLLBACK，我的触发器会记录除错误情况以外的所有内容。为了通知调用程序错误，需要使用RAISERROR语句。

Now my trigger logs everything except situation when there is error - because of ROLLBACK. RAISERROR statement is needed in order to inform calling program about error.

现在，我的错误处理代码如下：

Now, my error handling code looks like:

if (@err = 1)
begin
    INSERT INTO dbo.log(date, entry) SELECT getdate(), 'ERROR: ' + out from #output
    RAISERROR (@msg, 16, 1)
    rollback transaction
    return
end

推荐答案

另一种可能的选择是使用表变量捕获要存储在永久日志表中的信息。如果给出了ROLLBACK TRANSACTION命令，则不会回滚表变量。示例代码如下...

Another possible option is to use a table variable to capture the info you want to store in your permanent log table. Table variables are not rolled back if a ROLLBACK TRANSACTION command is given. Sample code is below...

--- Declare table variable
DECLARE @ErrorTable TABLE
  ( [DATE]  smalldatetime,
    [ENTRY] varchar(64) )

DECLARE @nErrorVar  int

--- Open Transaction
BEGIN TRANSACTION

--- Pretend to cause an error and catch the error code
SET @nErrorVar = 1  --- @@ERROR

IF (@nErrorVar = 1)
  BEGIN

    --- Insert error info table variable
    INSERT INTO @ErrorTable 
      ( [Date], [Entry] )
    SELECT
        getdate(), 'Error Message Goes Here'

    RAISERROR('Error Message Goes Here', 16, 1)

    ROLLBACK TRANSACTION

    --- Change this to actually insert into your permanent log table
    SELECT  *
    FROM    @ErrorTable

  END

IF @@TRANCOUNT  0
  PRINT 'Open Transactions Exist'
ELSE
  PRINT 'No Open Transactions'

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