f

BUT2/BD/td1.sql

@@ -12,12 +12,27 @@ drop table employe;
 --contraine unique et différée
 alter table employe add CONSTRAINT U_empl unique(nuempl,affect);
 
-alter table service add constraint fk_uempl foreign key(chef,nuserv)
+alter table service drop constraint fk_nuempl;
+
+alter table service add constraint fk_nuempl foreign key(chef,nuserv)
 references employe(nuempl,affect)initially deferred;
 
-alter table projet add constraint fk_utravail foreign key(resp,nuproj)
+alter table projet drop constraint fk_utravail;
+
+alter table projet add constraint fk_nutravail foreign key(resp,nuproj)
 references travail(nuempl,nuproj)initially deferred;
 
+alter table travail drop constraint fk_nuproj;
+alter table travail add constraint fk_nuproj foreign key(nuproj)
+references projet(nuproj)initially deferred;
+
+alter table concerne drop constraint fk_nuproj2;
+alter table concerne add constraint fk_nuproj2 foreign key(nuproj)
+references projet(nuproj)initially deferred;
+
+alter table travail add constraint fk_nuempl foreign key(nuempl)
+references employe(nuempl)initially deferred;
+
 insert into service values(88,'a',7);
 insert into employe values(3,'a',0,88,2000);
 commit;

BUT2/BD/td2.sql

+--TD2
+rollback;
+--EXERCICE 1 :
+
+/*create or replace TRIGGER modif_salaire after update
+on employe for each row
+BEGIN
+if :new.salaire < :old.salaire then raise_application_error
+(-20001,'viol de la règle :un salaire ne peut etre diminué') ;
+end if ;
+END;
+
+
+create or replace TRIGGER augment_hebdo after update on employe for each row 
+BEGIN 
+if :new.hebdo > :old.hebdo then raise_application_error
+(-20001,'viol de la règle : la durée hebdomadaire dun employé ne peut
+pas augmenter') ;
+end if;
+END;     */
+
+/*
+update employe
+set employe.salaire = 0;
+
+update employe
+set employe.hebdo = 40;
+*/
+
+--EXERCICE 2 :
+
+/*create or replace TRIGGER supprimer_employe after delete on employe
+BEGIN 
+delete from travail where nuempl not in (select nuempl from employe);
+END;
+
+create or replace TRIGGER supprimer_projet after delete on projet 
+BEGIN 
+delete from travail where nuproj not in (select nuproj from projet);
+delete from concerne where nuproj not in (select nuproj from projet);
+END;
+*/
+/*
+delete from employe where nuempl=14;
+delete from projet where nuproj=135;
+*/
+
+--EXERCICE 3 :
+
+CREATE OR REPLACE TRIGGER TRIG3 AFTER
+insert or update ON Table2
+DECLARE
+REC_T1 T1%ROWTYPE;
+BEGIN
+SELECT * INTO REC_T1 FROM T1
+WHERE Condition ;
+//1 seul enregistrement trouvé en lève une exception
+RAISE_APPLICATION_ERROR (numéro, message);//1
+EXCEPTION
+WHEN NO_DATA_FOUND THEN NULL;//0 enregist
+WHEN TOO_MANY_ROWS THEN
+RAISE_APPLICATION_ERROR ( ... );// 2 ou pl+
+END;
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