PL/SQL Procedure

The PL/SQL stored procedure or simply a procedure is a PL/SQL block which performs one or more specific tasks. It is just like procedures in other programming languages.

The procedure contains a header and a body.

• Header: The header contains the name of the procedure and the parameters or variables passed to the procedure.
• Body: The body contains a declaration section, execution section and exception section similar to a general PL/SQL block.

How to pass parameters in procedure:

When you want to create a procedure or function, you have to define parameters .There is three ways to pass parameters in procedure:

1. IN parameters: The IN parameter can be referenced by the procedure or function. The value of the parameter cannot be overwritten by the procedure or the function.
2. OUT parameters: The OUT parameter cannot be referenced by the procedure or function, but the value of the parameter can be overwritten by the procedure or function.
3. INOUT parameters: The INOUT parameter can be referenced by the procedure or function and the value of the parameter can be overwritten by the procedure or function.

A procedure may or may not return any value.

PL/SQL Create Procedure

Syntax for creating procedure:

CREATE [OR REPLACE] PROCEDURE procedure_name
    [ (parameter [,parameter]) ]
IS
    [declaration_section]
BEGIN
    executable_section
[EXCEPTION
    exception_section]
END [procedure_name];

Create procedure example

In this example, we are going to insert record in user table. So you need to create user table first.

Table creation:

create table user(id number(10) primary key,name varchar2(100));

Now write the procedure code to insert record in user table.

Procedure Code:

create or replace procedure "INSERTUSER"  
(id IN NUMBER,  
name IN VARCHAR2)  
is  
begin  
insert into user values(id,name);  
end;  
/     

Output:

Procedure created.

PL/SQL program to call procedure

Let's see the code to call above created procedure.

BEGIN  
   insertuser(101,'Rahul');
   dbms_output.put_line('record inserted successfully');  
END;  
/  

Now, see the "USER" table, you will see one record is inserted.

PL/SQL Drop Procedure

Syntax for drop procedure

DROP PROCEDURE procedure_name; 

Example of drop procedure

DROP PROCEDURE pro1;