From 7e26615aa7a03fc278ff28ef666f6bf74717f599 Mon Sep 17 00:00:00 2001 From: Carlos Galindo Date: Sun, 14 Oct 2018 12:52:33 +0200 Subject: [PATCH] Practica 2 --- practicas/prac2/03_create_squema.sql | 27 ++++++++++++++++++++++ practicas/prac2/05_populate_squema.sql | 18 +++++++++++++++ practicas/prac2/06_create_views.sql | 22 ++++++++++++++++++ practicas/prac2/08_view_insert_trigger.sql | 12 ++++++++++ practicas/prac2/09_mod_constraints.sql | 24 +++++++++++++++++++ practicas/prac2/10_cascade_trigger.sql | 23 ++++++++++++++++++ 6 files changed, 126 insertions(+) create mode 100644 practicas/prac2/03_create_squema.sql create mode 100644 practicas/prac2/05_populate_squema.sql create mode 100644 practicas/prac2/06_create_views.sql create mode 100644 practicas/prac2/08_view_insert_trigger.sql create mode 100644 practicas/prac2/09_mod_constraints.sql create mode 100644 practicas/prac2/10_cascade_trigger.sql diff --git a/practicas/prac2/03_create_squema.sql b/practicas/prac2/03_create_squema.sql new file mode 100644 index 0000000..fca1317 --- /dev/null +++ b/practicas/prac2/03_create_squema.sql @@ -0,0 +1,27 @@ +create table departamento( +cod_dep char(5) not null constraint cp_dep primary key initially immediate deferrable, +nombre varchar(40) not null, +director varchar(20), +telefono char(15)); + +create table profesor( +cod_pro char(5) not null constraint cp_prof primary key initially immediate deferrable, +nombre varchar(40) not null, +telefono char(15), +cod_dep char(5) constraint ca_prof_dep references departamento(cod_dep) initially immediate deferrable); + +create table asignatura( +cod_asg char(5) not null constraint cp_asi primary key initially immediate deferrable, +nombre varchar(40) not null, +semestre char(2) not null, +teoria number(3,1) not null, +prac number(3,1) not null, +cod_dep char(5) constraint ca_asi_dep references departamento(cod_dep) initially immediate deferrable); + +create table docencia( +cod_pro char(5) not null constraint ca_doc_prof references profesor(cod_pro) initially immediate deferrable, +cod_asg char(5) not null constraint ca_doc_asi references asignatura(cod_asg) initially immediate deferrable, +gteo number(2) not null, +gprac number(2) not null, +constraint cp_doc primary key(cod_pro, cod_asg) initially immediate deferrable); + diff --git a/practicas/prac2/05_populate_squema.sql b/practicas/prac2/05_populate_squema.sql new file mode 100644 index 0000000..465cf5d --- /dev/null +++ b/practicas/prac2/05_populate_squema.sql @@ -0,0 +1,18 @@ +insert into departamento values('DSIC','Sistemas Informaticos y Computacion','V. Botti','3500'); +insert into departamento values('DISCA','Ingenieria de Sistemas y Automatica','A. Crespo','6400'); +insert into profesor values('JCC','Juan Carlos Casamayor','3523','DSIC'); +insert into profesor values('MCG','Matilde Celma Gimenez','3234','DSIC'); +insert into profesor values('MAP','Maria Pastor','3666','DISCA'); +insert into asignatura values('BDA','Bases de Datos','2B',3,3,'DSIC'); +insert into asignatura values('AD3','Algoritmos y Estructuras de Datos III','2B',3,3,'DSIC'); +insert into asignatura values('BDV','Bases de Datos Avanzadas','5A',3,3,'DSIC'); +insert into asignatura values('APB','Desarrollo de aplicaciones de BD','3B',3,3,'DSIC'); +insert into asignatura values('SO','Sistemas Operativos','2A',3,3,'DISCA'); +insert into docencia values('MCG','SO',1,1); +insert into docencia values('MCG','BDA',2,1); +insert into docencia values('MCG','AD3',1,1); +insert into docencia values('JCC','BDA',1,2); +insert into docencia values('MAP','BDA',1,2); +insert into docencia values('MAP','BDV',1,2); +commit; + diff --git a/practicas/prac2/06_create_views.sql b/practicas/prac2/06_create_views.sql new file mode 100644 index 0000000..a01e40c --- /dev/null +++ b/practicas/prac2/06_create_views.sql @@ -0,0 +1,22 @@ +CREATE VIEW prof_dsic AS SELECT + cod_pro, nombre, telefono +FROM + profesor +WHERE + cod_dep = 'DSIC'; + +CREATE VIEW docencia_dsic AS SELECT + prof_dsic.cod_pro, prof_dsic.nombre AS nombre_pro, asignatura.cod_asg, + asignatura.nombre AS nombre_asg, gteo, gprac +FROM + prof_dsic, asignatura, docencia +WHERE + prof_dsic.cod_pro = docencia.cod_pro AND + docencia.cod_asg = asignatura.cod_asg; + +CREATE VIEW asg_dsic AS SELECT + asignatura.cod_asg, nombre_asg as nombre, semestre, teoria, prac, + COUNT(DISTINCT cod_pro) AS profesores, SUM(gteo + gprac) AS creditos +FROM + docencia_dsic JOIN asignatura ON docencia_dsic.cod_asg = asignatura.cod_asg +GROUP BY nombre_asg, semestre, teoria, prac, asignatura.cod_asg; \ No newline at end of file diff --git a/practicas/prac2/08_view_insert_trigger.sql b/practicas/prac2/08_view_insert_trigger.sql new file mode 100644 index 0000000..8d657c7 --- /dev/null +++ b/practicas/prac2/08_view_insert_trigger.sql @@ -0,0 +1,12 @@ +CREATE OR REPLACE TRIGGER prof_dsic_insert_trigger +INSTEAD OF INSERT ON prof_dsic +FOR EACH ROW +BEGIN +INSERT INTO profesor VALUES (:NEW.cod_pro, :NEW.nombre, :NEW.telefono, 'DSIC'); +END; +/ + +-- Probar disparador (ver insercion antes y despues) +INSERT INTO prof_dsic VALUES ('pp', 'Pepe', '963123123'); +DELETE FROM prof_dsic WHERE cod_pro = 'pp'; +DELETE FROM profesor WHERE cod_pro = 'pp'; \ No newline at end of file diff --git a/practicas/prac2/09_mod_constraints.sql b/practicas/prac2/09_mod_constraints.sql new file mode 100644 index 0000000..bfaf1ff --- /dev/null +++ b/practicas/prac2/09_mod_constraints.sql @@ -0,0 +1,24 @@ +INSERT INTO PROFESOR(cod_pro, nombre) VALUES('JR', 'Juan Ruiz'); +-- Fails here, constraint is INITIALLY IMMEDIATE +INSERT INTO PROFESOR(cod_pro, nombre) VALUES('JR', 'Javier Pérez'); +ROLLBACK; -- Don't save the first insertion + +-- Change constraint to be INITIALLY DEFERRED +ALTER TABLE profesor DROP PRIMARY KEY CASCADE KEEP INDEX; +ALTER TABLE profesor ADD CONSTRAINT cp_prof PRIMARY KEY(cod_pro) INITIALLY DEFERRED DEFERRABLE; +-- Because we used CASCADE to DROP the primary key constraint, +-- we need to restore the FOREIGN KEY in docencia +ALTER TABLE docencia + ADD CONSTRAINT ca_doc_prof + FOREIGN KEY(cod_pro) REFERENCES profesor(cod_pro) INITIALLY IMMEDIATE DEFERRABLE; + +INSERT INTO PROFESOR(cod_pro, nombre) VALUES('JR', 'Juan Ruiz'); +INSERT INTO PROFESOR(cod_pro, nombre) VALUES('JR', 'Javier Pérez'); +-- Fails here, constraint is INITIALLY DEFERRED +COMMIT; + +-- Restore constraint to initial setting +ALTER TABLE profesor DROP PRIMARY KEY CASCADE KEEP INDEX; +ALTER TABLE profesor ADD CONSTRAINT cp_prof PRIMARY KEY(cod_pro) INITIALLY IMMEDIATE DEFERRABLE; +ALTER TABLE docencia ADD CONSTRAINT ca_doc_prof FOREIGN KEY(cod_pro) REFERENCES profesor(cod_pro) INITIALLY IMMEDIATE DEFERRABLE; + diff --git a/practicas/prac2/10_cascade_trigger.sql b/practicas/prac2/10_cascade_trigger.sql new file mode 100644 index 0000000..616b820 --- /dev/null +++ b/practicas/prac2/10_cascade_trigger.sql @@ -0,0 +1,23 @@ +-- In WHEN, NEW and OLD don't need the colon + +-- Update docencia.cod_pro when profesor.cod_pro changes +CREATE OR REPLACE TRIGGER cascade_profesor_update +AFTER UPDATE ON profesor +FOR EACH ROW +WHEN (OLD.cod_pro <> NEW.cod_pro) +BEGIN + UPDATE docencia + SET cod_pro = :new.cod_pro + WHERE cod_pro = :old.cod_pro; +END; +/ + +-- Delete entries from docencia when profesor is deleted +CREATE OR REPLACE TRIGGER cascade_profesor_delete +AFTER DELETE ON profesor +FOR EACH ROW +BEGIN + DELETE FROM docencia + WHERE cod_pro = :old.cod_pro; +END; +/