MySQL Stored Procedures Best Practices

Create a Stored Procedure with Error Handling

Write a stored procedure that inserts a new product into a products table and handles duplicate key errors gracefully.

Expected output: Procedure inserts product or returns a clear error message if the product already exists.

Hint: Use DECLARE EXIT HANDLER for SQLSTATE '23000' to catch duplicate key errors.

Optimize a Stored Procedure Query

Analyze and optimize a stored procedure that retrieves customer orders with slow performance.

Expected output: Improved query execution time and efficient use of indexes.

Hint: Use EXPLAIN to check query plans and add indexes if necessary.

Stored procedures improve performance by reducing client-server communication, promote code reuse, and enhance security by encapsulating SQL logic.

You use DECLARE HANDLER statements to catch exceptions and define actions such as CONTINUE or EXIT to manage errors gracefully.

Dynamic SQL can introduce security risks like SQL injection and makes code harder to read and maintain.