Mysql Throw Error
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Mysql Raise Error In Trigger
more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question mysql sqlstate x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 6.2 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up mysql resignal How to raise an 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
Mysql Stored Procedure Error Handling
asked Jan 21 '09 at 15:22 Dónal 99.7k137411681 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| Did you find this question interesting? Try our newsletter Sign up for our newsletter and get our top new questions delivered to your inbox (see an example). Subscribed! Success! Please click the link in the confirmation email to activate your subscription. 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 d
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the mysql sqlstate values workings and policies of this site About Us Learn more about raiserror in mysql Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions
Mysql Trigger Error Handling
Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 6.2 million programmers, just like you, helping each other. http://stackoverflow.com/questions/465727/how-to-raise-an-error-within-a-mysql-function Join them; it only takes a minute: Sign up Throw an error in a MySQL trigger up vote 89 down vote favorite 16 If I have a trigger before the update on a table, how can I throw an error that prevents the update on that table? mysql database triggers share|improve this question edited Mar 11 at 8:26 un-lucky http://stackoverflow.com/questions/24/throw-an-error-in-a-mysql-trigger 11.8k41341 asked Aug 1 '08 at 12:12 maclema 9,22963041 add a comment| 6 Answers 6 active oldest votes up vote 34 down vote accepted Here is one hack that may work. It isn't clean, but it looks like it might work: Essentially, you just try to update a column that doesn't exist. share|improve this answer edited Dec 24 '12 at 21:24 weddingcakes 4521612 answered Aug 1 '08 at 13:02 Justin 1,54222956 Hi can you make a practical example on how to write the trigger in the link?I have two columns (idUser and idGuest) that must be mutually exclusive in the table orders, but i'm fairly new to triggers and i'm finding difficulties in writing it!Thx. –Nicola Peluchetti Mar 12 '11 at 14:44 add a comment| up vote 79 down vote As of MySQL 5.5, you can use the SIGNAL syntax to throw an exception: signal sqlstate '45000' set message_text = 'My Error Message'; State 45000 is a generic state representing "unhandled user-defined exception". Here is a more complete example of the approach: delimite
this tutorial, you will learn how to use SIGNAL and RESIGNAL statements to raise error conditions inside stored procedures.MySQL SIGNAL statementYou use the SIGNAL statement to return an http://www.mysqltutorial.org/mysql-signal-resignal/ error or warning condition to the caller from a stored program e.g., stored procedure, stored function, trigger or event. The SIGNAL statement provides you with control over which information for returning such as value and messageSQLSTATE.The following illustrates syntax of the SIGNAL statement: SIGNAL SQLSTATE | condition_name; SET condition_information_item_name_1 = value_1, condition_information_item_name_1 = value_2, etc;123SIGNAL SQLSTATE | error in condition_name;SET condition_information_item_name_1 = value_1,condition_information_item_name_1 = value_2, etc;Following the SIGNAL keyword is a SQLSTATE value or a condition name declared by the DECLARE CONDITION statement. Notice that the SIGNAL statement must always specify a SQLSTATE value or a named condition that defined with an SQLSTATE value.To provide the caller with information, you use the SET clause. If you mysql throw error want to return multiple condition information item names with values, you need to separate each name/value pair by a comma.The condition_information_item_name can be MESSAGE_TEXT, MYSQL_ERRORNO, CURSOR_NAME , etc.The following stored procedure adds an order line item into an existing sales order. It issues an error message if the order number does not exist. DELIMITER $$ CREATE PROCEDURE AddOrderItem( in orderNo int, in productCode varchar(45), in qty int, in price double, in lineNo int ) BEGIN DECLARE C INT; SELECT COUNT(orderNumber) INTO C FROM orders WHERE orderNumber = orderNo; -- check if orderNumber exists IF(C != 1) THEN SIGNAL SQLSTATE '45000' SET MESSAGE_TEXT = 'Order No not found in orders table'; END IF; -- more code below -- ... END1234567891011121314151617181920212223DELIMITER $$CREATE PROCEDURE AddOrderItem( in orderNo int, in productCode varchar(45), in qty int, in price double, in lineNo int )BEGIN DECLARE C INT; SELECT COUNT(orderNumber) INTO C FROM orders WHERE orderNumber = orderNo; -- check if orderNumber exists IF(C != 1) THEN SIGNAL SQLSTA