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PROCEDURES



Oracle - Procedures


A Procedure is a subprogram unit that consists of a group of PL/SQL statements. Each procedure in Oracle has its own unique name by which it can be referred. This subprogram unit is stored as a database object.
A procedure is a group of PL/SQL statements that can be called by name. The call specification (sometimes called call spec) specifies a java method or a third-generation language routine so that it can be called from SQL and PL/SQL.


Create Procedure

Syntax :

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

Following are the three types of procedures that must be defined to create a procedure.

  • IN: It is a default parameter. It passes the value to the subprogram.

  • OUT: It must be specified. It returns a value to the caller.

  • IN OUT: It must be specified. It passes an initial value to the subprogram and returns an updated value to the caller.


    Oracle Create procedure example :

    In this example, we are going to insert record in the "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.
    

    Oracle 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.

    IDName
    101Rahul

    Oracle Drop Procedure :

    Syntax
    DROP PROCEDURE procedure_name;   
    
    

    Example to drop procedure
    DROP PROCEDURE pro1;  
    
    


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