Stored Procedure in SQL Server 2012

Introduction

 

In this article, I give a short description of Stored Procedures. In this article I describe how to create a Stored Procedure, use of Stored Procedures, the benefits of Stored Procedures and Stored Procedures for insert, update, delete and join.

 

Stored Procedure

 

Stored Procedures are a precompiled set of one or more statements that are stored together in the database. They reduce the network load because of the precompilation. We can create a Stored Procedure using the "Create proc" statement.

 

Why we use Stored Procedure

 

There are several reasons to use a Stored Procedure. They are a network load reducer and decrease execution time because they are precompiled. The most important use of a Stored Procedure is for security purposes. They can restrict SQL Injection. We can avoid SQL injection by use of a Stored Procedure.

 

Difference Between Stored Procedure and Function

1. A Stored Procedure may or may not return a value but a function always returns a value.
2. We can use a function in a Stored Procedure but we can't use a Stored Procedure in a Function
   

Here we create two tables named emp and emp1 on which we apply a Stored Procedure.

Creation of emp table

create table emp(empId int, empName varchar(15), empAge int )

Inserting values

insert into emp
select 1,'deepak',21 union all
select 2,'Arora',21 union all
select 3,'Vandna',22

Output

select * from emp

 

Creation of emp1 table

create table emp1(empId int,empAdd varchar(35))

Inserting the value

insert into emp1
select 1,'delhi'union all
select 2,'banglore'union all
select 3,'usa'

Output

select * from emp1

 

Type of Stored Procedure

1. System Stored Procedure
2. User Defined Stored Procedure

Here I describe only User Defined Stored Procedure

 

Types of User Defined Store Procedure

1. Non-parameterized Stored Procedure
2. Parameterized Stored Procedure

Non-parameterized Stored Procedure

 

This type of Stored Procedure does not accept parameters.

 

Non-parameterized Stored Procedure for Showing All Records

create proc usp_select
as
select * from emp

Output

exec usp_select

 

Non-parameterized Stored Procedure for Join

create proc usp_join
as
select e.empId,e.empName,e.empAge,e1.empAdd from emp e inner join emp1 e1 on e.empId=e1.empId

Output

exec usp_join

 

Parameterized Stored Procedure

 

These accept one or more Parameters. It is important that the data type of the parameters be the same as the data type in the tables.

 

Parameterized Stored Procedure for Insert

create proc usp_insert(@id int,@name  varchar(15),@age int)
as
insert into emp values(@id,@name,@age)

Output

exec usp_insert 4,'Ankit',19

exec usp_select

 

Parameterized Stored Procedure for Update

create proc usp_update(@id int,@name  varchar(15),@age int)
as
update emp set empName=@name,empAge=@age where empId=@id

Output

exec usp_update 4,'Mohan',20

exec usp_select

 

Parameterized Store Procedure for delete

create proc usp_delete(@id int)
as
delete from emp where empId=@id

Output

exec usp_delete 4

exec usp_select

 

Summary

 

In this article, I described Store Procedures in SQL Server. I hope this article has helped you to understand this topic. Please share if you know more about this. Your feedback and constructive contributions are welcome.