Mysql Procedure Error
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Mysql Declare Exit Handler
x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 6.2 million programmers, just like you, helping each other. Join mysql resignal them; it only takes a minute: Sign up MySQL Stored Procedure 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 http://dev.mysql.com/doc/en/declare-handler.html 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 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 http://stackoverflow.com/questions/7764887/mysql-stored-procedure-error-handling 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 6,76621524 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 4,3751343 1 Thanks! Really useful. All I've got to do now is upgrade to 5.6 ;-) –Tom Mac Jan 20 '12 at 9:05 add a comment| up vote 7 down vote 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 ... it is hard/impossible to derive the exact nature of the error. Luckily that is not true. SHOW ERRORS LIMIT 1 -- for SQL-state > 2 SHOW WARNINGS LIMIT 1 -- for SQL
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more http://stackoverflow.com/questions/465727/how-to-raise-an-error-within-a-mysql-function about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack https://www.otreva.com/blog/how-to-blog/mysql-stored-procedure-custom-error-handling/ Overflow is a community of 6.2 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up How to raise an error within a MySQL function up vote stored procedure 41 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 stored-procedures share|improve this question edited Dec 9 '15 at 14:18 dolmen 3,23921521 asked Jan 21 '09 at 15:22 Dónal 99.7k137411681 add a comment| 6 Answers 6 active oldest mysql stored procedure votes up vote 40 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 11.8k1572114 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 may not have accounting removed.'; IF (SELECT invoice_id FROM accounted_barcodes WHERE id = p_id ) THEN CALL raise_error; END IF; DELETE FROM accounted_barcodes WHERE id = p_id; END // DELIMITER ; Output: call decount_test(123456); +----------------------------------------------------+ | Invoiced barcodes may not have accounting removed. | +----------------------------------------------------+ | Invoiced barcodes may not have accounting removed. | +-------------
13th, 2013 at 6:04 pm. custom database error mysql store procedures MySQL Stored Procedure Custom Error Handling When using MySQL Stored Procedures in your application, it is important to be able to return multiple messages to the caller. MySQL will take care of all the directly database related errors, such as table not found, but for user errors, there is not much built in for that. An example of this would be on user login, user name does not exist and/or password is incorrect. Returning one of these could be done with a select statement, but when you want to return both errors, it is not as simple. The following is the system I came up with for our applications. Within the Stored Procedure, here are the steps from a high level with a short explanation. 1. Create a temporary table to hold errors. Temporary tables have session scope, and if you design the stored procedures correctly, there will be one call per session. This essentially makes this table “local” to the stored procedure. The column(s) can be whatever you want, but currently, I store errors as INTs which can then be interpreted by the caller. This makes multilingual platform errors easier to output and takes message maintenance away from the database. With most databases not on the same server as the caller, this minimizes the amount of data transferred across the bottleneck of the internet. 2. Process the passed parameters and run all checks needed. Anything that is incorrect, insert the corresponding error into the table. 3. At this point, if there was any errors with the parameters passed or the call in general, they should all be in the table. See #01 below to see how I handle the exception. Get a count from the errors table. If 0, then continue with processing, otherwise, select all from errors table and LEAVE the SP or have this as the last executable statement. Here is an example for the user login functionality: CREATE PROCEDURE userLogin( _email VARCHAR(50), _password VARCHAR(30) ) MODIFIES SQL DATA SQL SECURITY DEFINER BEGIN BEGIN DROP TABLE IF EXISTS errors;CREATE TEMPORARY TABLE errors(error INT)ENGINE=MEMORY; END; BEGIN DECLARE hasErrors BOOLEAN DEFAULT FALSE; ...declarations... SELECT TRUE, (password = hashThis(_password)) INTO emailExists, usingCorrectPassword FROM users WHERE email = _email; IF _em