Mysql Error Handling In 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 mysql resignal as continuing or exiting the current code block’s execution, and issuing
Mysql Stored Procedure Raise Error
a meaningful error message.MySQL provides an easy way to define handlers that handle from general conditions mysql error handling php such as 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 https://dev.mysql.com/doc/refman/5.6/en/get-diagnostics.html 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 values:CONTINUE : the execution of the enclosing code block ( BEGIN http://www.mysqltutorial.org/mysql-error-handling-in-stored-procedures/ … 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. 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
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handling? In the mysql forums, there's been a quite lively discussion regarding how to go about error handling. A quick summary:The MySQL Stored Procedure, trigger and function syntax supports HANDLERs to react to on or more CONDITIONs, should they arise. The syntax and the semantics of these are compliant with the 2003 version of the SQL Standard (this is both an ANSI as well as an ISO standard).A condition can take several forms: it might be:a particular SQLSTATE (these are defined in the SQL Standard)a particular mysql specific error codeone of the predefined identifiers for the general conditions: NOT FOUNDSQLEXCEPTION or SQLWARNING the name of a previously declared, user defined condition (right now, a condition declaration must be bound to a SQLSTATE or a mysql specific errorcode, effectively aliasing it)I think the concept of declaring separate handlers for capturing specific error conditions is both powerful and elegant: It allows you to deal with errors in a generic manner, and it separates the code that deals with errors entirely from the code that is supposed to do the 'business-as-usual' work. So far, so good. However, just being able to react to errors is not good enough: In order to sucessfully handle the general conditions NOT FOUND, SQLWARNING and SQLEXCEPTION, the handler need to be able to retrieve some details concerning the specific error.One needs to be able to explicitly raise a (user-defined)condition using a special statement When a handler finds it is not suitable to handle the condition fully itself after all, it should be able to pass the condition on to the outer blocks to give other handlers a chanceGetting information on the condition being handledThe lack of this feature has been the subject of questions and confusion in the mysql forums for quite some time, at least as long as I am on them (which is about july 2005 - we're talking mysql 5.0.7 here. There are older ones too: check out this one). Especially when declaring a handler for something as general as SQLEXCEPTION or SQLWARNING, both of which act as a sort of 'wildcard' conditions, one needs to be able to find out the nature of the actual problem that occurred. A snipppet might explain this: begin declare continue handler for not found --handl