T-SQL Tutorial is a online tutorial dedicated to all developers beginners and advanced, covering the main areas of tsql language, sql and ms sql server. Transact SQL tutorial is based more by example than by a written documentation is a quicker way to learn. PDF version of T-SQL Tutorial. PHP - Connecting to and executing a stored procedure in an SQL server. SQL - Stored Procedure.php.
CALL GetCustomers;And the statement returns the same result as the query.The first time you invoke a stored procedure, MySQL looks up for the name in the database catalog, compiles the stored procedure’s code, place it in a memory area known as a cache, and execute the stored procedure.If you invoke the same stored procedure in the same session again, MySQL just executes the stored procedure from the cache without having to recompile it.A stored procedure can have so you can pass values to it and get the result back. For example, you can have a stored procedure that returns customers by country and city.
In this case, the country and city are parameters of the stored procedure.A stored procedure may contain control flow statements such as, and LOOP that allow you to implement the code in the procedural way.A stored procedure can call other stored procedures or, which allows you to modulize your code.Note that you will learn step by step how to in the next tutorial. MySQL stored procedures advantagesThe following are the advantages of stored procedures. Reduce network trafficStored procedures help reduce the network traffic between applications and MySQL Server.
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Because instead of sending multiple lengthy SQL statements, applications have to send only the name and parameters of stored procedures. Centralize business logic in the databaseYou can use the stored procedures to implement business logic that is reusable by multiple applications. The stored procedures help reduce the efforts of duplicating the same logic in many applications and make your database more consistent. Make database more secureThe database administrator can grant appropriate privileges to applications that only access specific stored procedures without giving any privileges on the underlying tables. MySQL stored procedures disadvantagesBesides those advantages, stored procedures also have disadvantages: Resource usagesIf you use many stored procedures, the memory usage of every connection will increase substantially.Besides, overusing a large number of logical operations in the stored procedures will increase the CPU usage because the MySQL is not well-designed for logical operations. TroubleshootingIt’s difficult to debug stored procedures. Unfortunately, MySQL does not provide any facilities to debug stored procedures like other enterprise database products such as Oracle and SQL Server.
MaintenancesDeveloping and maintaining stored procedures often requires a specialized skill set that not all application developers possess. This may lead to problems in both application development and maintenance.In this tutorial, you have learned about the MySQL stored procedures, their advantages, and disadvantages. Let’s move on to learn how to create a new stored procedure in MySQL.