Mysql Error Handling Stored Procedures
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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
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continuing or exiting the current code block’s execution, and issuing a mysql stored procedure raise error meaningful error message.MySQL provides an easy way to define handlers that handle from general conditions such as
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warnings or exceptions to specific conditions e.g., specific error codes.Declaring a handlerTo declare a handler, you use the DECLARE HANDLER statement as follows: DECLARE action HANDLER FOR http://dev.mysql.com/doc/en/declare-handler.html 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 values:CONTINUE : the execution of the enclosing code block ( BEGIN … END ) http://www.mysqltutorial.org/mysql-error-handling-in-stored-procedures/ 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. 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, r
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta http://stackoverflow.com/questions/7764887/mysql-stored-procedure-error-handling Discuss the workings and policies of this site About Us Learn https://www.otreva.com/blog/how-to-blog/mysql-stored-procedure-custom-error-handling/ more 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 Overflow is a community of 6.2 million programmers, just like stored procedure 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 mysql 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
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