The newly added try catch in sql server 2005 can easily catch exceptions. I will take a look at it today and summarize the key points as follows.
Basic usage BEGIN TRY
{ sql_statement |
statement_block }
END TRY
BEGIN CATCH
{ sql_statement |
statement_block }
END CATCH
, similar to the usage of exception handling in ordinary languages, but it should be noted that SQL SERVER only catches exceptions that are not serious. When exceptions such as the database cannot be connected, etc., it cannot be caught. An example is: BEGIN TRY
DECLARE @X INT
-- Divide by zero to generate Error
SET @X = 1/0
PRINT 'Command after error in TRY block'
END TRY
BEGIN CATCH
PRINT 'Error Detected'
END CATCH
PRINT 'Command after TRY/CATCH blocks'
In addition, try catch can be nested in Begin TRY
delete from GrandParent where Name = 'John Smith'
print 'GrandParent deleted successfully'
End Try
Begin 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 Catch
End Catch
In addition, SQL SERVER 2005 provides error class methods in the exception mechanism to facilitate debugging. It is excerpted as follows, which is relatively simple and will not be explained. 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. The final example is as follows, using the error class method BEGIN TRY
DECLARE @X INT
-- Divide by zero to generate Error
SET @X = 1/0
PRINT 'Command after error in TRY block'
END TRY
BEGIN 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_Message
END CATCH
PRINT 'Command after TRY/CATCH blocks'
Finally output Error Detected
Err_Num Err_Sev Err_State Err_Proc Err_Line Err_Msg
------- ------- --------- -------------------- ------- ----------------------------------
8134 16 1 NULL 4 Divide by zero error encountered.
Source: jackyrong BLOG