Handle Error Mysql
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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 error message.MySQL provides
Exception Handling In Mysql Stored Procedure Example
an easy way to define handlers that handle from general conditions such as warnings try catch in mysql stored procedure or exceptions to specific conditions e.g., specific error codes.Declaring a handlerTo declare a handler, you use the DECLARE HANDLER statement as
Mysql Exit Handler
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 or exit the current code block based on mysql stored procedure get error message 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 the following values:A MySQL error code.A standard SQLSTATE value. Or it mysql declare exit handler 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 was terminated';END;The following handler means that if there are no more rows to fetch, in case of a cursor or SELECT INTO statement
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Mysql Get Diagnostics In Stored Procedure
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here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn http://stackoverflow.com/questions/3146838/handle-error-for-duplicate-entries-php-mysql 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 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Handle error for duplicate entries - PHP MySQL up vote 20 down vote favorite 2 I have a PHP form which enters data into my MySQL stored procedure database. My primary key is one of the user-entered values. When the user enters a value that already exists in the table, the MySQL error "Duplicate entry 'entered value' for key 1" is returned. Instead of that error, I would like to alert the user that they need to enter a different value. Just an echoed message or something. I guess my question comes down to: how to turn a specific MySQL error into a PHP mysql stored procedure message Thanks edit: nickf's answer below is nice, but is there any way to discern between specific errors? php mysql error-handling share|improve this question edited Jun 30 '10 at 6:39 asked Jun 30 '10 at 6:09 RobHardgood 103116 add a comment| 3 Answers 3 active oldest votes up vote 31 down vote accepted To check for this specific error, you need to find the error code. It is 1062 for duplicate key. Then use the result from errno() to compare with: mysql_query('INSERT INTO ...'); if (mysql_errno() == 1062) { print 'no way!'; } A note on programming style You should always seek to avoid the use of magic numbers (I know, I was the one to introduce it in this answer). Instead, you could assign the known error code (1062) to a constant (e.g. MYSQL_CODE_DUPLICATE_KEY). This will make your code easier to maintain as the condition in the if statement is still readable in a few months when the meaning of 1062 has faded from memory :) share|improve this answer edited Jun 30 '10 at 7:14 answered Jun 30 '10 at 6:47 jensgram 22.8k25675 1 Yeah, that's a good point. This didn't work though... are you sure 1022 is the right error code? I'll start looking too. Thanks –RobHardgood Jun 30 '10 at 7:10 Ah, it's 1062, cf. dev.mysql.com/doc/refman/5.1/en/… . Will edit answer. &nd