Maciej Basista
S3524, gr.311
Project Documentation
Car Insurance
Definition of TABLES
Table customer
create table customer(
cid number(4) primary key,
cname varchar(12) not null,
csurname varchar(12) not null,
cadress varchar(12) not null,
cphone number(8) not null)
;
Table staff
create table staff(
sid number(4) primary key,
sname varchar(12),
ssurname varchar(12),
sadress varchar(12),
sposition varchar(12),
sphone number(8),
salary number(8))
Table insurance
create table insurance(
insid number(4) primary key,
year_from number(4) not null,
year_to number(4) not null,
cid number(4) references customer,
sid number(4) references staff,
price number(12) not null)
Table car
create table car(
carid number(4) primary key,
car_brand varchar(12) not null,
car_colour varchar(12) not null,
cid number(4) references customer)
Table recent_customers (stores all deleted customers)
create table recent_customers(
cid number(4) not null,
Table SAL
create table SAL(
ids NUMBER(4) PRIMARY KEY ,
losal NUMBER(7,2) not null,
hisal NUMBER(7,2) not null,
position varchar2(12) not null)
________________________________________________________
TRIGGERS
set serveroutput on
ChangeCust is an after delete trigger. Each time we delete any customer from table ‘customer’, this customer is added to table ‘recent_customers’. This is used to store all recent customers as a history.
create or replace trigger ChangeCust
after delete
on customer
for each row
begin
insert into recent_customers values( //into this table values are inserted
:old.cid, //variable from table customer
:old.cname, //variable from table customer
:old.csurname, //variable from table customer
:old.cadress, , //variable from table customer
:old.cphone); , //variable from table customer
end;
/
AddCustomer is after insert trigger. After inserting new values to table ‘customer’ then a text appear: 'A NEW CUSTOMER ADDED', it confirms us that we have added a new customer.
create or replace trigger AddCustomer //creating trigger
after insert //must be after insert
dbms_output.put_line('A NEW CUSTOMER ADDED'); //this text will appear after adding
InsuranceIndex is before insert trigger. Before we create a new insurance, the insurance ‘insid’ index is automatically created. Each time it is increased by 1 for a new insurance.
create or replace trigger InsuranceIndex
before insert
on insurance //on table insurance
select nvl(max(i.insid)+1,1) //maximum insid is taken, then its increased by 1.
into :new.insid /// for new id
from insurance i;
CheckPrice is before insert or update trigger. It’s main task is to not allow enter price of insurance lower than 1.
create or replace trigger CheckPrice
before insert or update
on insurance //name of table we work on
if (:new.price < 1)then //If we try to enter price
Raise_application_error(-20000,'WRONG PRICE ENTERED!'); //lower 1, error will start.
end if;
DontDelete trigger doesn’t allow to delete any insurance from the table.
create or replace trigger DontDelete
before delete //must be before delete
on insurance //table insurance
Raise_application_error(-20001,'YOU CANT DELETE AN INSURANCE!!!'); //error raise
SalUpdate – after update trigger. This trigger will inform us, each time if we decrease employee salary.
create or replace trigger SalUpdate //creating trigger
after update //because after entering new price
on staff
if(:new.salary < :old.salary) then //this checks if new salary is bigger
dbms_output.put_line('WARNING!!! NEW SALARY IS LOWER THAN OLD SALARY!!!'); //if not then this text will appear
___________________________________________________________________________
PROCEDURES
RaiseSalary procedure. This procedure is used to raise salary of given by the user employee. While executing procedure we give as id of employee and amount of money we want to increase salary of this person.
create or replace procedure RaiseSalary(idin number, adding number) //creating of procedure
AS
empty exception; //exception , of empty employee
change_grade exception; //exception when salary is not in allowed interval from table sal
ile integer; //declaration of variable ile
salary integer (7,2); //declaration of variable salary
my_pos varchar2(20); //declaration of variable my_pos
my_losal integer; //declaration of variable my_losal
my_hisal integer; //declaration of variable my_hisal
my_sal integer; //declaration of variable my_sal
BEGIN
select count(*) into ile from staff where staff.sid=idin; - // ile must be 1
if ile != 1 then raise empty; // if not 1 then exception raise, person not exists
else
select sposition,salary into my_pos,my_sal from staff where sid=idin;
select s.losal, s.hisal into my_losal, my_hisal from sal s where s.position=my_pos;
if my_sal+adding>my_hisal or my_sal+adding<my_losal then raise change_grade;
// new salary should be beetwen losal and hisal value if nto then exception chang_grade raises
update staff set salary=salary+adding; //if it’s between losal and hisal , in table staff value is
end if; modified
exception //definition of exceptions
when empty then
dbms_output.put_line('Not exists'); if the //displays message that person doesn’t exists
when change_grade then
dbms_output.put_line('Changing grade not allowed!'); //if not in losal and hisal
end; //end of procedure
Addcustom procedure is used to adding a new customers. Filling in table customer. Also exceptions are included.
create or replace procedure Addcustom( //creating a procedure, with given parameters
Cname IN customer.cname%type, //%cname means, that it will be the sam type as
Csurname IN customer.csurname%type, in ‘parent’ table
Cadress IN customer.cadress%type,
Cphone IN customer.cphone%type)
thesame exception; //declaration of exceptions
counter integer;
Cid customer.cid%type; //cid – customer index , the same type as in customer table
select count(*) into counter from customer c where c.csurname=Csurname;
if counter != 0 //if counter != it means that user with the same surname exists
then raise thesame; that’s not allowed so the error is raised
select NVL(max(customer.cid)+1,1) into Cid //adds index, increasing by 1 for new customer
from customer;
insert into customer //new row is filled by given values
values(Cid,Cname,Csurname,Cadress,Cphone);
exception
when thesame then
dbms_output.put_line('Warning! The same surname exists!!'); //error raises when the same
surname
Twolowest procedure displays 2 lowest salaries of all employees. As a parameter while executing we give an number.
create or replace procedure twolowest(param NUMBER) //creating a procedure
cursor salaries is //declaring a cursor, which returns all rows from staff ordered by sal
select sname,ssurname,salary from staff order by salary ; //cursor data
my_salaries salaries%rowtype;
counter INTEGER;
no_workers exception;
select count(*) into counter from staff;
if counter=0 then raise no_workers; //checks if there are any workers
DBMS_output.put_line('LOWEST EARNINGS:');
open salaries;
fetch salaries into my_salaries; //takes firs row from cursor
DBMS_output.put_line('1:'||my_salaries.sname||' '||my_salaries.ssurname||' '||my_salaries.salary||'.'); //displays first row
fetch salaries into my_salaries;
DBMS_output.put_line('2:'||my_salaries.sname||' '||my_salaries.ssurname||' '||my_salaries.salary||'.'); //takes second row from cursor
...
Phoob