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.

ID	Name
101	Rahul

PL/SQL Drop Procedure

Syntax for drop procedure

DROP PROCEDURE procedure_name;   

Example of drop procedure

DROP PROCEDURE pro1;