Error Handling Examples In Mysql
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Mysql Stored Procedure Get Error Message
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Mysql Stored Procedure Raise Error
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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 it appropriately, such as continuing or exiting the current code block’s execution, and issuing a meaningful mysql declare exit handler error message.MySQL provides an easy way to define handlers that handle from general mysql exception handling java conditions such as warnings or exceptions to specific conditions e.g., specific error codes.Declaring a handlerTo declare a handler, you use
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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 https://dev.mysql.com/doc/refman/5.6/en/declare-handler.html or exit the current code block based on the action . The action accepts one of the following 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 http://www.mysqltutorial.org/mysql-error-handling-in-stored-procedures/ 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. DECLARE CONTINUE HANDLER FOR SQLEXCEPTION SET has_error = 1;1DECLARE CONTINUE HANDLER FOR SQLEXCEPTION SET has_error = 1;The following is another handler which means that in case any error occurs, rollback the previous operation, issue an error message, and exit the current code block. If you declare it inside the BEGIN END block of a stored procedure, it will terminate stored procedure immediately. DECLARE EXIT HANDLER FOR SQLEXCEPTION BEGIN ROLLBACK; SELECT 'An error has occurred, operation rollbacked and the stored procedure was terminated'; END;12345DECLARE EXIT HANDLER FOR SQLEXCEPTIONBEGINROLLBACK;SELECT 'An error has occurred, operation rollbacked and the stored procedure
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login Search for: LoginUsernamePasswordRegisterLost password? facebook google twitter rss Error Handling Examples Posted on September 6, 2007 by OReillyMedia In this second article in a three-part series, you will learn more about errors and exception handlers. It is excerpted from chapter six of the book MySQL Stored Procedure Programming, written by Guy Harrison and Steven Feuerstein (O'Reilly; ISBN: 0596100892). Copyright © 2006 O'Reilly Media, Inc. All rights reserved. Used with permission from the publisher. Available from booksellers or direct from O'Reilly Media.Handler Examples Here are some examples of handler declarations: If any error condition arises (other than a NOT FOUND), continue execution after setting l_error=1: DECLARE CONTINUE HANDLER FOR SQLEXCEPTIO N SET l_error=1; If any error condition arises (other than a NOT FOUND ), exit the current block or stored program after issuing a ROLLBACK statement and issuing an error message: DECLARE EXIT HANDLER FOR SQLEXCEPTION BEGIN ROLLBACK; SELECT ‘Error occurred – terminating'; END; If MySQL error 1062 (duplicate key value) is encountered, continue execution after executing the SELECT statement (which generates a message for the calling program): DECLARE CONTINUE HANDER FOR 106 2 SELECT ‘Duplicate key in index'; If SQLSTATE 23000 (duplicate key value) is encountered, continue execution after executing the SELECT statement (which generates a message for the calling program): DECLARE CONTINUE HANDER FOR SQLSTATE ‘23000' SELECT ‘Duplicate key in index'; When a cursor fetch or SQL retrieves no values, continue execution after setting l_done=1 : DECLARE CONTINUE HANDLER FOR NOT FOUN D SET l_done=1; Same as the previous example, except specified using a SQL