Triggers and Upper, Lower limit?

Hi, I have a scheme library and a plan of borrowing activities, he says that for a child to borrow a book, he or she must be between the values and superior recommended for the title of the book.

I am trying to create a trigger for new borrowers who try to borrow a book and if they are not in the upper and lower age limits then it is not suitable for them to borrow and will print a message saying: it is not allowed.

I have these tables

Create table borrower (borId varchar2 (5))
borName varchar2 (20).
borAddress varchar2 (20).
Number of borMaxbooks (10),
number of Borage (2),
constraint pk_borId key (borId)) primary;




Create table Publisher (pubId varchar2 (5))
Nom_pub varchar2 (20).
PubAddress varchar2 (20).
constraint pk_pubId key (pubId)) primary;


Create table BookTitle (isbn varchar2 (5))
btName varchar2 (30),
number of yearPublished (4).
pubId varchar2 (5).
number of ageLower (2),
number of ageUpper (2),
Value number (4.2),
constraint pk_isbn primary key (isbn).
constraint fk_pubId foreign key (pubId) references Publisher (pubId));

Create the BookCopy table (bcId varchar2 (5))
ISBN varchar2 (5).
date of dateAcquired,
date of dateDestroyed,
constraint pk_bcId primary key (bcId).
constraint fk_isbn foreign key (isbn) references BookTitle (isbn));

Create table ready (borId varchar2 (5))
bcId varchar2 (5).
dateOut date,
Date payment date.
dateBack date,
primary key constraint pk_loan (borId, bcId, DateOut),
constraint fk_borId foreign key (borId) references Borrower (borId).
constraint fk_bcId foreign key (bcId) references BookCopy (bcId));


Create table Author (authorId varchar2 (5))
authorName varchar2 (20).
constraint pk_authorId key (authorId)) primary;

Create table paternity (authorId varchar2 (5))
ISBN varchar2 (5).
constraint pk_authorship primary key (authorid, isbn).
constraint fk_authorid foreign key (authorid) references Author (authorid),.
constraint fk_isbn2 foreign key (isbn) references bookTitle (isbn));



And it's my trip (I have no experience with the triggers so I know it won't). What is the correct syntax to force a check on the age limit instead of the "UpperAge > Borage < LowerAge" and is the correct one to use here variable ' Count'?

create or replace trigger CheckRecommendedAge
before insert or update on loan
for each line

declare
Number of BorID;
Number of LowerAge;
Number of UpperAge;
Number of Borage;
Ex Exception;


Begin
Select Count (*) in the Borage
Of booktitle, borrower
Où Borid =: new. Borid;
If LowerAge > Borage < UpperAge then
Dbms_output.put_line ('book borrowed successfully');
On the other
Rossanna ex;
End if;

Exception
When ex then
Raise_application_error(-2000), "borrower". : new. BorID | "Does not fit in terms of age");

Try this trigger, it should work. If syntax errors occur the message here... .new

create or replace trigger CRA
before insert or update on loan
for each row
declare
got_age Borrower.borAge%type;
lower_age BookTitle.ageLower%type;
upper_age BookTitle.ageUpper%type;
cus_exp exception;
begin
select borAge into got_age from Borrower where borId=:new.borId;
select ageLower,ageUpper into lower_age,upper_age from BookTitle where isbn=(select isbn from BookCopy where bcId=:new.bcId);
if got_age>lower_age and got_age

Tags: Database

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