What Are SQL Stored Procedures and How Do You Create Them?

Stored procedures: as functions for your SQL.

What Are SQL Stored Procedures and How Do You Create Them?

A stored procedure is a batch of SQL statements created and stored in a database. You can reuse a stored procedure over and over again.

A stored procedure can accept parameters, execute a query, and return results. Many users can call a stored procedure, and different applications can call it with different parameter values.

What are the benefits of using stored procedures?

In addition to allowing multiple users and applications to reuse it, a stored procedure has other benefits.

  • It is easy to modify. You can change a stored procedure when necessary, and these updates will be reflected for all users. Also, you don’t need to redeploy your application when you modify the stored procedure.
  • It reduces network traffic because the server only passes the procedure name over the network and not the entire query.
  • Improves database security as users do not have direct access to the tables. To make changes, they must call the stored procedure. This prevents SQL injection attacks since users cannot directly write to the underlying tables.

A database engine like MySQL has many security features that you should be aware of.

Syntax for creating a stored procedure in SQL Server

The syntax for creating a stored procedure is as follows:

CREATE PROCEDURE procedure_name
AS
sql_statement
GO;

Run this command to run the stored procedure.

EXEC procedure_name;

Example of a simple stored procedure in SQL Server

This is an example of a stored procedure that selects all articles from an article database.

CREATE PROCEDURE All_Articles
AS
SELECT * FROM Article
GO;

This is a simple example, but you can do a lot more with stored procedures, like accepting parameters and updating records.

How to create a stored procedure that accepts parameters

For example, modify the simple stored procedure to accept a number as a parameter and use it to return posts with a view count greater than the number.

CREATE PROCEDURE Popular_Articles(@views int)
AS
SELECT * FROM Article
WHERE views_count >= @views_count
GO;

Use this command to run the stored procedure with one parameter.

EXEC Popular_Articles 300;

The procedure returns articles whose view count is greater than 300.

Learn SQL first before using stored procedures

Stored procedures allow you to reuse a group of SQL statements. They also improve database security, reduce network traffic, and are easy to modify.

Therefore, it is important to learn about stored procedures, but you must first have a solid understanding of SQL.

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