Error Handling In Stored Procedure Mysql
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Mysql Stored Procedure Raise Error
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Mysql Stored Procedure Error Handling Rollback
Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up MySQL Stored Procedure https://dev.mysql.com/doc/refman/5.6/en/get-diagnostics.html Error Handling up vote 10 down vote favorite 5 I believe there is nothing currently available in MySQL that allows access to the SQLSTATE of the last executed statement within a MySQL stored procedure. This means that when a generic SQLException is raised within a stored procedure it is hard/impossible to derive the exact nature of the error. Does anybody have a workaround for deriving http://stackoverflow.com/questions/7764887/mysql-stored-procedure-error-handling the SQLSTATE of an error in a MySQL stored procedure that does not involve declaring a handler for every possible SQLSTATE? For example - imagine that I am trying to return an error_status that goes beyond the generic "SQLException happened somewhere in this BEGIN....END block" in the following: DELIMITER $$ CREATE PROCEDURE `myProcedure`(OUT o_error_status varchar(50)) MY_BLOCK: BEGIN DECLARE EXIT handler for 1062 set o_error_status := "Duplicate entry in table"; DECLARE EXIT handler for 1048 set o_error_status := "Trying to populate a non-null column with null value"; -- declare handlers ad nauseum here.... DECLARE EXIT handler for sqlexception set o_error_status:= "Generic SQLException. You'll just have to figure out the SQLSTATE yourself...." ; -- Procedure logic that might error to follow here... END MY_BLOCK$$ Any tips? PS I am running MySQL 5.1.49 mysql stored-procedures error-handling share|improve this question edited Oct 14 '11 at 10:29 asked Oct 14 '11 at 8:19 Tom Mac 6,74621524 add a comment| 3 Answers 3 active oldest votes up vote 6 down vote accepted GET DIAGNOSTICS is available in 5.6.4 See http://dev.mysql.com/doc/refman/5.6/en/get-diagnostics.html share|improve this answer answered Jan 19 '12 at 9:10 Marc Alff 4,3551343 1 Thanks! Really useful. All
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the http://stackoverflow.com/questions/465727/how-to-raise-an-error-within-a-mysql-function workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs http://www.databasejournal.com/features/mysql/mysql-error-handling-using-the-signal-and-resignal-statements.html Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; stored procedure it only takes a minute: Sign up How to raise an error within a MySQL function up vote 40 down vote favorite 7 I've created a MySQL function and would like to raise an error if the values passed for the parameters are invalid. What are my options for raising an error within a MySQL function? mysql function exception mysql stored procedure stored-procedures share|improve this question edited Dec 9 '15 at 14:18 dolmen 3,22921421 asked Jan 21 '09 at 15:22 Dónal 99.3k137411680 add a comment| 6 Answers 6 active oldest votes up vote 38 down vote MySQL 5.5 introduces signals, which are similar to exceptions in other languages: http://dev.mysql.com/doc/refman/5.5/en/signal.html For example, in the mysql command line client: mysql> SIGNAL SQLSTATE '45000' SET MESSAGE_TEXT = 'Custom error'; ERROR 1644 (45000): Custom error share|improve this answer answered Aug 6 '12 at 13:39 Austin Hyde 11.7k1572114 add a comment| up vote 24 down vote It's actually a combination of all three answers. You call a non-existent procedure to raise the error, and then declare an exit handler that catches the error you generated. Here's an example, using SQLSTATE 42000 (procedure does not exist) to throw an error before deletion if the row to be deleted has a foreign key id set: DROP PROCEDURE IF EXISTS decount_test; DELIMITER // CREATE DEFINER = 'root'@'localhost' PROCEDURE decount_test ( p_id bigint ) DETERMINISTIC MODIFIES SQL DATA BEGIN DECLARE EXIT HANDLER FOR SQLSTATE '42000' SELECT 'Invoiced barcodes
RESOURCES Database Tools SQL Scripts & Samples Links » Database Forum » Slideshows » Sitemap Free Newsletters: DatabaseDaily News Via RSS Feed Database Journal |DBA Support |SQLCourse |SQLCourse2 Featured Database Articles MySQL Posted August 10, 2015 MySQL Error Handling using the Signal and Resignal Statements By Rob Gravelle All programming languages incorporate some sort of error handling mechanism for handling unexpected occurrences and a graceful exit from the application if need be. MySQL introduced the SIGNAL and RESIGNAL statements in version 5.5 (as per the SQL 2003 spec) to serve that purpose. It allows you to raise your own error conditions from your stored procedures, triggers, and events. In today’s article we’ll learn some of the key differences between SIGNAL and RESIGNAL as well as how to utilize both. Basic Syntax Before MySQL 5.5, developers had to resort to workarounds such as deliberately referring to a nonexistent table to cause a routine to throw an error. Thankfully, SIGNAL (and RESIGNAL) may now be employed to provide error information to a handler and/or to the calling process. Moreover, SIGNAL provides some control over the error's attributes such as the error number, SQLSTATE value, and message. Here is the basic syntax for the SIGNAL statement and an explanation of each part: SIGNAL SQLSTATE | condition_value [SET signal_information_item= value_1, [, signal_information_item] = value_2, etc;] Following the SIGNAL keyword is an SQLSTATE value or a condition name declared by a DECLARE CONDITION statement. Notice that the SIGNAL statement must always specify an SQLSTATE value or a named condition that defined with an SQLSTATE value. Related Articles MySQL Numeric Overflow Gotcha An Overview of the MySQL Performance Schema MySQL Date Gotchas Importing Into MySQL from Other Databases The SQLSTATE value for a SIGNAL statement consists of a five character alphanumeric code. The full list of pre-defined codes are listed in the docs. Never start your own SQLSTATE code with '00' because such values indicate success and are not valid for signali