Error Handling Stored Procedure Sql Server 2005
Contents |
resources Windows Server 2012 resources Programs MSDN subscriptions Overview Benefits Administrators Students Microsoft error handling in stored procedure sql server 2008 Imagine Microsoft Student Partners ISV Startups TechRewards Events Community
Error Handling In Stored Procedure Sql Server 2012
Magazine Forums Blogs Channel 9 Documentation APIs and reference Dev centers Retired content
Sql Server Stored Procedure Error Handling Best Practices
Samples We’re sorry. The content you requested has been removed. You’ll be auto redirected in 1 second. Microsoft SQL Server Language Reference
Mysql Stored Procedure Error Handling
Transact-SQL Reference (Database Engine) Control-of-Flow Language (Transact-SQL) Control-of-Flow Language (Transact-SQL) TRY...CATCH (Transact-SQL) TRY...CATCH (Transact-SQL) TRY...CATCH (Transact-SQL) BEGIN...END (Transact-SQL) BREAK (Transact-SQL) CONTINUE (Transact-SQL) ELSE (IF...ELSE) (Transact-SQL) END (BEGIN...END) (Transact-SQL) GOTO (Transact-SQL) IF...ELSE (Transact-SQL) RETURN (Transact-SQL) THROW (Transact-SQL) TRY...CATCH (Transact-SQL) WAITFOR (Transact-SQL) WHILE (Transact-SQL) TOC Collapse oracle stored procedure error handling the table of content Expand the table of content This documentation is archived and is not being maintained. This documentation is archived and is not being maintained. TRY...CATCH (Transact-SQL) Other Versions SQL Server 2012 THIS TOPIC APPLIES TO: SQL Server (starting with 2008)Azure SQL DatabaseAzure SQL Data Warehouse Parallel Data Warehouse Implements error handling for Transact-SQL that is similar to the exception handling in the Microsoft Visual C# and Microsoft Visual C++ languages. A group of Transact-SQL statements can be enclosed in a TRY block. If an error occurs in the TRY block, control is passed to another group of statements that is enclosed in a CATCH block. Transact-SQL Syntax ConventionsSyntax Copy -- Syntax for SQL Server, Azure SQL Database, Azure SQL Data Warehouse, Parallel Data Warehouse BEGIN TRY { sql_sta
SERVER - 2005 - Explanation of TRY…CATCH and ERROR Handling April 11, 2007Pinal DaveSQL, SQL Performance, SQL Server, SQL Tips and Tricks46 commentsSQL Server 2005 offers a more robust set of tools for handling errors than in previous versions of SQL sql stored procedure try catch Server. Deadlocks, which are virtually impossible to handle at the database level in error handling in sql server stored procedure SQL Server 2000, can now be handled with ease. By taking advantage of these new features, you can focus more error handling in sql server 2012 on IT business strategy development and less on what needs to happen when errors occur. In SQL Server 2005, @@ERROR variable is no longer needed after every statement executed, as was the case https://msdn.microsoft.com/en-us/library/ms175976.aspx in SQL Server 2000. SQL Server 2005 provides the TRY…CATCH construct, which is already present in many modern programming languages. TRY/CATCH helps to write logic separate the action and error handling code. The code meant for the action is enclosed in the TRY block and the code for error handling is enclosed in the CATCH block. In case the code within the TRY block fails, the http://blog.sqlauthority.com/2007/04/11/sql-server-2005-explanation-of-trycatch-and-error-handling/ control automatically jumps to the CATCH block, letting the transaction roll back and resume execution. In addition to this, the CATCH block captures and provides error information that shows you the ID, message text, state, severity and transaction state of an error.Functions to be used in CATCH block are :ERROR_NUMBER: returns the error number, and is the same value of @@ERROR.ERROR_SEVERITY: returns the severity level of the error that invoked the CATCH block.ERROR_STATE: returns the state number of the error.ERROR_LINE: returns the line number where the error occurred.ERROR_PROCEDURE: returns the name of the stored procedure or trigger for which the error occurred.ERROR_MESSAGE: returns the full message text of the error. The text includes the values supplied for any substitutable parameters, such as lengths, object names, or times.You can use these functions anywhere inside a CATCH block, and they will return information regarding the error that has occurred. These functions will return the value null outside of the CATCH block. Syntax: BEGIN TRY
{ sql_statement |
statement_block }
END TRY
BEGIN CATCH
{ sql_statement |
statement_block }
END CAT
how you should implement error handling when you write stored procedures, including when you call them from ADO. The other article, Error Handling in SQL Server - a Background, gives a deeper description of the idiosyncrasies with error handling in SQL Server http://www.sommarskog.se/error-handling-II.html and ADO. That article is in some sense part one in the series. However, you can read this article without reading the background article first, and if you are not a very experienced user of SQL Server, I recommend you https://www.mssqltips.com/sqlservertip/1027/sql-server-2005-try-and-catch-exception-handling/ to start here. In places there are links to the background article, if you want more information about a certain issue. Note: this article is aimed at SQL2000 and earlier versions of SQL Server. SQL2005 offers significantly improved methods for error handling error handling with TRY-CATCH. This article is not apt if you are using SQL 2005 or later. I don't have a complete article on error handling for SQL 2005, but I have an unfinished article with a section Jumpstart Error Handling that still can be useful. Table of Contents: Introduction The Presumptions A General Example Checking Calls to Stored Procedures The Philosophy of Error Handling General Requirements Why Do We Check for Errors? When Should You Check @@error? ROLLBACK or error handling in not to ROLLBACK - That's the Question SET XACT_ABORT ON revisited Error Handling with Cursors Error Handling with Triggers Error Handling with User-Defined Functions Error Handling with Dynamic SQL Error Handling in Client Code What to Do in Case of an Error? Command Timeouts Why is My Error Not Raised? Getting the Return Value from a Stored Procedure Acknowledgements and Feedback Revision History Introduction Error handling in stored procedures is a very tedious task, because T-SQL offers no exception mechanism, or any On Error Goto. All you have is the global variable @@error which you need to check after each statement for a non-zero value to be perfectly safe. If you call a stored procedure, you also need to check the return value from the procedure. In fact, this is so extremely tedious, so you will find that you will have to make compromises and in some situations assume that nothing can go wrong. Still, you cannot just ignore checking for errors, because ignoring an error could cause your updates to be incomplete, and compromise the integrity of your data. Or it can cause a transaction to run for much longer time than intended, leading to blocking and risk that the user loses all his updates when he logs out. In the first section, I summarize the most important points of the material in the background article, so you know under which presumptions you have to work.
1 | 2 | 3 | More > Error Handling Problem Error handling in previous versions of SQL Server was not the easiest thing to do. You could test the value of @@ERROR or check @@ROWCOUNT, but if the error was a fatal error you did not have a lot of options. Solution With SQL Server 2005, new error handling has been introduced with the TRY...CATCH processing. Basically what happens is when an error occurs the processing in the TRY block stops and processing is then picked up in the CATCH block. The following illustrates a simple example of how this is done: Step Code Output 1 CREATE PROCEDURE usp_ExampleProcAS SELECT * FROM NonexistentTable;GO Command(s) completed successfully. 2 EXECUTE usp_ExampleProc Msg 208, Level 16, State 1, Procedure usp_ExampleProc, Line 3Invalid object name 'NonexistentTable'. (Note: Processing Stops) 3 BEGIN TRY EXECUTE usp_ExampleProcEND TRYBEGIN CATCH SELECT ERROR_NUMBER() as ErrorNumber, ERROR_MESSAGE() as ErrorMessage;END CATCH; 208 Invalid object name 'NonexistentTable'. (Note: Processing Continues) 4 BEGIN TRY EXECUTE usp_ExampleProcEND TRYBEGIN CATCHEND CATCH; Command(s) completed successfully. (Note: Processing Continues) As you can see from the above code and output that when we create the stored procedure for a non-existent table in Step 1 the procedure creates without a problem. If we run the stored procedure using the code in Step 2, we get an error message that the object does not exist. If we run the stored procedure using the code in Step 3, the error is sent to the CATCH block and an error message is returned. At this point processing can continue without a problem. To further illustrate this in Step 4 the stored procedure is run, the error is caught in the CATCH block, but we are not doing anything to process the error. Normally you would have something happen, but this shows that you don't have to have any code in the CATCH block. The values that can be retrieved from the error are also much more detailed, then what you could get with previous versions of SQL Server. Below is a list of the data that can be retrieved when an error occurs. ERROR_NUMBER() - returns the number of the error. ERROR_SEVERITY() - returns the severity. ERROR_STATE() - returns the error state number. ERROR_PROCEDURE() - returns the name of the stored procedure or trigger where the error occurred. ERROR_LINE() - returns the line number inside the routine that caused the error. ERROR_MESSAGE() - returns the complete text of the error message. Running the same query above, but returning all of the error information is displayed below. ERROR_NUMBER ERROR_SEVERITY ERROR_STATE ERROR_PROCEDURE ERROR_LINE