Raise Error Stored Procedure Mysql
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Mysql Stored Procedure Error Handling
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error within a MySQL function up vote 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 mysql raise error in trigger Dónal 99.8k137411681 add a comment| 6 Answers 6 active oldest 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); +---------------------------------------------
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to handle exceptions or errors encountered in stored procedures.When an error occurs inside a stored procedure, it is important to handle http://www.mysqltutorial.org/mysql-error-handling-in-stored-procedures/ it appropriately, such as continuing or exiting the current code block’s execution, and issuing a meaningful error message.MySQL provides an easy way to define handlers that handle from general conditions such as warnings or exceptions to specific conditions e.g., specific error codes.Declaring a handlerTo declare a handler, you use stored procedure the DECLARE HANDLER statement as follows: DECLARE action HANDLER FOR condition_value statement;1DECLARE action HANDLER FOR condition_value statement;If a condition whose value matches the condition_value , MySQL will execute the statement and continue or exit the current code block based on the action . The action accepts one of the following mysql stored procedure values:CONTINUE : the execution of the enclosing code block ( BEGIN … END ) continues.EXIT : the execution of the enclosing code block, where the handler is declared, terminates.The condition_value specifies a particular condition or a class of conditions that activates the handler. The condition_value accepts one of the following values:A MySQL error code.A standard SQLSTATE value. Or it can be an SQLWARNING , NOTFOUND or SQLEXCEPTION condition, which is shorthand for the class of SQLSTATE values. The NOTFOUND condition is used for a cursor or SELECT INTO variable_list statement.A named condition associated with either a MySQL error code or SQLSTATE value.The statement could be a simple statement or a compound statement enclosing by the BEGIN and END keywords.MySQL error handling examplesLet’s look into several examples of declaring handlers.The following handler means that if an error occurs, set the value of the has_error variable to 1 and continue the execution