Mysql Procedure Error Handling
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Declare Exit Handler For Sqlexception
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Mysql Sqlexception Error Message
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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 mysql resignal code block’s execution, and issuing a meaningful error message.MySQL provides an easy mysql stored procedure raise error way to define handlers that handle from general conditions such as warnings or exceptions to specific conditions mysql error handling php e.g., specific error 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 http://dev.mysql.com/doc/en/declare-handler.html 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 ) continues.EXIT : the execution of the enclosing code block, where the handler is declared, http://www.mysqltutorial.org/mysql-error-handling-in-stored-procedures/ 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, 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
InterviewsMySQL InterviewsDBA ScriptSQL Server DBA ScriptPostgreSQL DBA ScriptMySQL DBA Script(: Laugh@dbrnd :)Blog Archives !Contact Me MySQL Error Handling May 21, 2015June 15, 2015 Anvesh PatelMySQL In this post I http://www.dbrnd.com/2015/05/mysql-error-handling/ will describe how to handle errors into mysql stored procedure.Whenever any exception is occurring in a stored procedure, then this is very important to handle this exception by showing proper error messages.If you do not handle the exception, then there would be chance to fail application with certain exception in stored procedure.As per my advise, stored procedure if you get an error in stored procedure, then instead of exit, you should continue without any error. Means you can show any default or custom error code or message to the application so base on this application can decide to show a proper message at user level.MySQL provides Handler to handle exception in mysql stored procedure stored procedure.Below is a full demonstration of handler with examples.12345678910/*Create Employee database for demo */CREATE DATABASE Employee;/*Create sample EmployeeDetails table.*/CREATE TABLE Employee.tbl_EmployeeDetails ( EmpID INTEGER ,EmpName VARCHAR(50),EmailAddress VARCHAR(50),CONSTRAINT pk_tbl_EmployeeDetails_EmpID PRIMARY KEY (EmpID))ENGINE = InnoDB;How to declare handler in store procedure:Syntax of Handler: 1DECLARE handler_action HANDLER FOR condition_value ... statementThree type of Handler_Action: CONTINUEEXITUNDOType of Condition Value:mysql_error_codesqlstate_valueSQLWarningSQLExceptionNotFoundHow to write handler in stored procedure ?:E.g.1234DECLARE CONTINUE HANDLER FOR SQLEXCEPTION SELECT 'Error occured';DECLARE CONTINUE HANDLER FOR SQLEXCEPTION SET IsError=1;DECLARE EXIT HANDLER FOR SQLEXCEPTION SET IsError=1;DECLARE EXIT HANDLER FOR SQLSTATE '23000' SET IsError = 1;The Above is four different handler example. Now I am going to insert duplicate value into EmpID column.12345678910111213141516171819202122232425262728293031DELIMITER //CREATE PROCEDURE Employee.usp_InsertEmployeeDetails( InputEmpID INTEGER,InputEmpName VARCHAR(50),InputEmailAddress VARCHAR(50))/****************************************************************Authors Name : Anvesh PatelCreated Date : 2015-05-20Description : This is demo stored procedure to insert record into table with proper error handling.Basically for www.dbrnd.com readers. *****************************************************************/BEGIN DECLARE CONTINUE HANDLER FOR SQLEXCEPTION SELECT 'Error occured'; INSERT INTO Employee.tbl_EmployeeDetails (EmpID,EmpName ,EmailAddress ) VALUES (InputEmpID,InputEmpName ,InputEmailAddress ); SELECT *FROM Employee.tbl_Empl