sql server 2005中新增加的try catch，可以很容易捕捉異常了，今天大概學習看了下，歸納下要點如下

基本用法BEGIN TRY {; sql_statement | statement_block; }END TRYBEGIN CATCH {; sql_statement | statement_block }END CATCH，和普通語言的異常處理用法差不多，但要注意的是，SQL SERVER只捕捉那些不是嚴重的異常，當比如數據庫不能連接等這類異常時，是不能捕捉的一個例子：BEGIN TRY DECLARE @X INT -- Divide by zero to generate Error SET @X = 1/0 PRINT 'Command after error in TRY block'END TRYBEGIN CATCH PRINT 'Error Detected'END CATCHPRINT 'Command after TRY/CATCH blocks'; 另外try catch可以嵌套Begin TRY delete from GrandParent where Name = 'John Smith' print 'GrandParent deleted successfully'End TryBegin Catch Print 'Error Deleting GrandParent Record' Begin Try delete from Parent where GrandParentID = (select distinct ID from GrandParent where Name = 'John Smith') Print 'Parent Deleted Successfully' End Try Begin Catch print 'Error Deleting Parent' Begin Try delete from child where ParentId = (select distinct ID from Parent where GrandParentID = (select distinct ID from GrandParent where Name = 'John Smith')) print 'Child Deleted Successfully' End Try Begin Catch Print 'Error Deleting Child' End Catch End CatchEnd Catch另外，SQL SERVER 2005在異常機制中，提供了error類的方法方便調試，現摘抄如下，比較簡單，不予以解釋ERROR_NUMBER(): Returns a number associated with the error.ERROR_SEVERITY(): Returns the severity of the error.ERROR_STATE(): Returns the error state number associated with the error.ERROR_PROCEDURE(): Returns the name of the stored procedure or trigger in which the error occurred.ERROR_LINE(): Returns the line number inside the failing routine that caused the error. ERROR_MESSAGE(): Returns the complete text of the error message. The text includes the values supplied for any substitutable parameters, such as lengths, object names, or times. 最后舉例子如下，使用了error類的方法BEGIN TRY DECLARE @X INT -- Divide by zero to generate Error SET @X = 1/0 PRINT 'Command after error in TRY block'END TRYBEGIN CATCH PRINT 'Error Detected' SELECT ERROR_NUMBER() ERNumber, ERROR_SEVERITY() Error_Severity, ERROR_STATE() Error_State, ERROR_PROCEDURE() Error_Procedure, ERROR_LINE() Error_Line, ERROR_MESSAGE() Error_MessageEND CATCHPRINT 'Command after TRY/CATCH blocks'最后輸出Error DetectedErr_Num Err_Sev Err_State Err_Proc;;Err_Line; Err_Msg------- ------- --------- -------------------- --------- --------------------------------8134;;;;;16; 1 NULL 4;;;;;Divide by zero error encountered.