Error handling in procedures in MySQL - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the purpose of error handling in MySQL stored procedures?

Error handling in MySQL stored procedures helps manage and respond to errors during procedure execution, preventing unexpected crashes and allowing graceful recovery or informative messages.

beginner

Which MySQL statement is used to declare an error handler inside a stored procedure?

The DECLARE HANDLER statement is used to declare an error handler in MySQL stored procedures.

intermediate

What are the two types of handlers you can declare in MySQL procedures?

You can declare CONTINUE and EXIT handlers. CONTINUE runs the handler and continues execution, EXIT runs the handler and exits the block.

intermediate

How do you handle a specific SQL error code in a MySQL procedure?

You declare a handler for that specific error code using DECLARE HANDLER FOR SQLSTATE 'error_code' or DECLARE HANDLER FOR error_number.

beginner

What happens if no handler is declared for an error in a MySQL stored procedure?

If no handler is declared, the error causes the procedure to stop and the error is returned to the caller, which may cause the entire transaction to fail.

Which statement declares an error handler in a MySQL stored procedure?

A DECLARE HANDLER FOR

B CREATE HANDLER

C SET ERROR HANDLER

D BEGIN HANDLER

The correct syntax to declare an error handler is using DECLARE HANDLER FOR.

What does a CONTINUE handler do in a MySQL procedure?

A Stops execution after handling the error

B Rolls back the transaction

C Ignores the error silently

D Continues execution after handling the error

A CONTINUE handler runs the handler code and then continues with the next statement.

How do you specify a handler for all SQL exceptions in MySQL?

A DECLARE HANDLER FOR SQLSTATE 'HY000'

B DECLARE HANDLER FOR SQLEXCEPTION

C DECLARE HANDLER FOR SQLWARNING

D DECLARE HANDLER FOR SQLERROR

SQLEXCEPTION covers all errors and exceptions in MySQL error handling.

What happens if an error occurs and no handler is declared?

A The procedure ignores the error

B The procedure continues silently

C The procedure stops and returns the error

D The procedure retries the statement

Without a handler, the procedure stops and the error is returned to the caller.

Which handler type exits the current block after handling the error in MySQL?

A EXIT

B CONTINUE

C RETRY

D UNDO

EXIT handlers run the handler code and then exit the current code block.

Explain how to declare and use an error handler in a MySQL stored procedure.

Think about how you tell the procedure what to do when an error happens.

Describe the difference between CONTINUE and EXIT handlers in MySQL procedures.

Consider what happens after the handler code runs.