Error Handling In Sql Stored Procedures In Sql Server 2005
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Exception Handling In Sql Server Stored Procedure
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This part is also available in a Spanish translation by Geovanny Hernandez. Introduction This article is the first in a series of three about mysql stored procedure error handling error and transaction handling in SQL Server. The aim of this first article
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is to give you a jumpstart with error handling by showing you a basic pattern which is good sql stored procedure try catch for the main bulk of your code. This part is written with the innocent and inexperienced reader in mind, why I am intentionally silent on many details. The purpose here is http://www.codeproject.com/Articles/38650/Overview-of-Error-Handling-in-SQL-Server to tell you how without dwelling much on why. If you take my words for your truth, you may prefer to only read this part and save the other two for a later point in your career. On the other hand, if you question my guidelines, you certainly need to read the other two parts, where I go into much deeper detail exploring http://www.sommarskog.se/error_handling/Part1.html the very confusing world of error and transaction handling in SQL Server. Parts Two and Three, as well as the three appendixes, are directed towards readers with a more general programming experience, although necessarily not with SQL Server. This first article is short; Parts Two and Three are considerably longer. Table of Contents Introduction Index of All Error-Handling Articles Why Error Handling? Essential Commands TRY-CATCH SET XACT_ABORT ON General Pattern for Error Handling Three Ways to Reraise the Error Using error_handler_sp Using ;THROW Using SqlEventLog Final Remarks End of Part One Revision History Index of All Error-Handling Articles Here follows a list of all articles in this series: Part One - Jumpstart Error Handling (this article). Part Two - Commands and Mechanisms. Part Three - Implementation. Appendix 1 - Linked Servers. (Extends Part Two.) Appendix 2 - CLR. (Extends both Parts Two and Three.) Appendix 3 - Service Broker. (Extends Part Three.) All the articles above are for SQL2005 and later. For those who still are on SQL2000, there are two older articles: Error Handling in SQL Server 2000 – a Background. Implementing Error Handl
Joe Toscano explains how to tune stored procedures with the new TRY…CATCH paradigm. In this Article Share this item with http://searchsqlserver.techtarget.com/tip/Tune-stored-procedures-with-exception-handling-in-SQL-Server-2005 your network: Related Content T-SQL error handling with Try...Catch blocks – SearchSQLServer http://www.sqlteam.com/article/handling-sql-server-errors Top 10 SQL Server development tips of 2007 – SearchSQLServer Exception handling best practices in SQL Server 2005 – SearchSQLServer This Content Component encountered an error This Content Component encountered an error Throughout this series of tips, contributor Joe Toscano discusses how to tune stored procedure and improve your SQL Server 2005... Sign in for existing members Continue Reading This Article Enjoy this article as well as all of our content, including E-Guides, news, tips and more. Step 2 of 2: You forgot to provide an Email Address. This email address doesn’t appear to be valid. This email address is already registered. Please login. error handling in You have exceeded the maximum character limit. Please provide a Corporate E-mail Address. By submitting my Email address I confirm that I have read and accepted the Terms of Use and Declaration of Consent. By submitting your personal information, you agree that TechTarget and its partners may contact you regarding relevant content, products and special offers. You also agree that your personal information may be transferred and processed in the United States, and that you have read and agree to the Terms of Use and the Privacy Policy. stored procedure code. Exception handling was widely thought to be one of the weakest aspects of T-SQL script writing. Fortunately, this has changed in SQL Server 2005, which supports structured error handling. This tip focuses first on the basics of the new TRY…CATCH constructs and then looks at some sample SQL Server 2000 and 2005 T-SQL that produces constraint violations using transactional code. Future tips will continue along this theme. TABLE OF CONTENTS Exception handling before SQL Server 2005 Introducing
| Tags: Stored Procedures, SQL Server 2005, Transactions, SQL Server 2008 Features, Error Handling This article covers the basics of TRY CATCH error handling in T-SQL introduced in SQL Server 2005. It includes the usage of common functions to return information about the error and using the TRY CATCH block in stored procedures and transactions. SQL Server uses the following syntax to capture errors in Transact-SQL statements: BEGIN TRY SELECT [First] = 1 SELECT [Second] = 1/0 SELECT [Third] = 3 END TRY BEGIN CATCH PRINT 'An error occurred' END CATCH This returns the following output: First ----------- 1 (1 row(s) affected) Second ----------- (0 row(s) affected) An error occurred A key difference from SQL Server 2000 is that execution is halted when SQL Server encounters an error. At that point execution transfers to the CATCH block. This error isn't returned to the client application or calling program. The TRY CATCH block consumes the error. Error Functions Inside the CATCH block there are a number of specialized functions to return information about the error. BEGIN TRY SELECT [Second] = 1/0 END TRY BEGIN CATCH SELECT [Error_Line] = ERROR_LINE(), [Error_Number] = ERROR_NUMBER(), [Error_Severity] = ERROR_SEVERITY(), [Error_State] = ERROR_STATE() SELECT [Error_Message] = ERROR_MESSAGE() END CATCH Second ----------- (0 row(s) affected) Error_Line Error_Number Error_Severity Error_State ----------- ------------ -------------- ----------- 2 8134 16 1 (1 row(s) affected) Error_Message --------------------------------------------------- Divide by zero error encountered. (1 row(s) affected) These are the functions you can use inside a CATCH block. These functions all return NULL if they are called from outside a CATCH block. ERROR_NUMBER. The number of the error that occurred. This is similar to @@ERROR except that it will return the same number for the duration of the CATCH block. ERROR_MESSAGE. The complete text of the error message including any substiture parameters such as object names. ERROR_LINE. This is the line number of the batch or stored procedure where the error occure