Error Handling In Mysql Stored Procedure
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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 mysql stored procedure error handler block’s execution, and issuing a meaningful error message.MySQL provides an easy way mssql stored procedure error handling to define handlers that handle from general conditions such as warnings or exceptions to specific conditions e.g., specific error mysql declare exit handler codes.Declaring a handlerTo declare a handler, you use 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
Mysql Stored Procedure Raise Error
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 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 mysql signal 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. 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 F
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Mysql Stored Procedure Error Handling Rollback
Stack Overflow Questions Jobs 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 http://www.mysqltutorial.org/mysql-error-handling-in-stored-procedures/ you, helping each other. Join 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 within a MySQL stored procedure. This means that when a generic SQLException http://stackoverflow.com/questions/7764887/mysql-stored-procedure-error-handling 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 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 Oc
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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 ind