Why we use Procedures?

Question

Hi Friends,
I would like to know about procedures in using real life.I m confuse about the use of it.Please help me out.......
1.Why we use Procedures?
2.Where we use procedures in real life?
3.Can we insert 100 of records in a table through a procedures?
4.is it good to insert through procedures?

Answer 1

kindly refer below code but i sure if u google around u will find a lots of answer.
for me procedures is a small programs just like other programming language and your code will be more easy to manage and more faster in debugging process.
The syntax for a procedure is:
CREATE [OR REPLACE] PROCEDURE procedure_name
[ (parameter [,parameter]) ]
IS
[declaration_section]
BEGIN
executable_section
[EXCEPTION
exception_section]
END [procedure_name];
When you create a procedure or function, you may define parameters. There are three types of parameters that can be declared:
IN - The parameter can be referenced by the procedure or function. The value of the parameter can not be overwritten by the procedure or function.
OUT - The parameter can not be referenced by the procedure or function, but the value of the parameter can be overwritten by the procedure or function.
IN OUT - The parameter can be referenced by the procedure or function and the value of the parameter can be overwritten by the procedure or function.
The following is a simple example of a procedure:
CREATE OR REPLACE Procedure UpdateCourse
( name_in IN varchar2 )
IS
cnumber number;
cursor c1 is
select course_number
from courses_tbl
where course_name = name_in;
BEGIN
open c1;
fetch c1 into cnumber;
if c1%notfound then
cnumber := 9999;
end if;
insert into student_courses
( course_name,
course_number)
values ( name_in,
cnumber );
commit;
close c1;
EXCEPTION
WHEN OTHERS THEN
raise_application_error(-20001,'An error was encountered - '||SQLCODE||' -ERROR- '||SQLERRM);
END;
This procedure is called UpdateCourse. It has one parameter called name_in. The procedure will lookup the course_number based on course name. If it does not find a match, it defaults the course number to 99999. It then inserts a new record into the student_courses table.