varchar(30), Primary Key (name))engine=innodb; bigint not null auto_increment, Primary Key (accountid))engine=innodb;

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2 DDL commands to create Relational schema create table Items( name photo date publisherid varchar(150), Primary Key (name))engine=innodb; create table Users ( username password rateavg bigint not null auto_increment, varchar(20), float(1,1), Primary Key ())engine=innodb; create table Aspects ( aspect index(aspect), Foreign Key () References Items (name) Primary Key (,aspect))engine=innodb;

3 create table Rates ( aspect rating bigint not null, int not null, Foreign Key () References Items (name) Foreign Key () References Users () Foreign Key (aspect) References Aspects (aspect) Primary Key (,,aspect))engine=innodb; create table Comments ( commentid flagcount date likes dislikes comment bigint not null auto_increment, bigint not null, int default 0 not null, int default 0 not null, int default 0 not null, longtext, Foreign Key () References Items (name)

4 Primary Key (commentid))engine=innodb; create table Favorites ( bigint not null, Foreign Key () References Items (name) Foreign Key () References Users () Primary Key (,))engine=innodb; create table Categories ( categoryname varchar(25), Primary Key (categoryname))engine=innodb; create table SubCategories ( categoryname varchar(25), subcategoryname varchar(25), index(subcategoryname), (categoryname) Foreign Key (categoryname) References Categories Primary Key (categoryname,subcategoryname))engine=innodb;

5 create table HasCategory ( categoryname varchar(25), subcategoryname varchar(25), Foreign Key () References items (name) (categoryname) Foreign Key (categoryname) References categories (subcategoryname) Foreign Key (subcategoryname) References subcategories Primary Key ())engine=innodb; create table Links ( link varchar(150), Foreign Key () References Items (name) Primary Key (,link))engine=innodb; create table Specifications (

6 spec value Foreign Key () References Items (name) Primary Key (,spec))engine=innodb; create table Keywords ( keyword Foreign Key () References Items (name) Primary Key (,keyword))engine=innodb; create table ItemFlags ( flagcount int default 0 not null, Foreign Key () References Items (name) Primary Key ())engine=innodb; create table UserFlags ( bigint not null, flagcount int default 0 not null,

7 Foreign Key () References Users () Primary Key ())engine=innodb; delimiter create trigger ItemDefaultKeywords after insert on HasCategory for each row begin insert into Keywords (,keyword) values (new.,new.categoryname); insert into Keywords (,keyword) values (new.,new.subcategoryname); insert into Keywords (,keyword) values (new.,new.); End; create trigger ItemFlagCountCreate after insert on Items for each row begin insert into ItemFlags () values (new.name); End; create trigger UserFlagCountCreate after insert on Users for each row begin insert into UserFlags () values (new.);

8 End; create trigger DeleteFlaggedItem after update on ItemFlags for each row begin if new.flagcount>1000 then delete from Items where name = new.; end if; End;

9 Instructions how to download and run the GUI. To download the Project source code we need first to access the webpage. The webpage is icom5016.ece.uprm.edu/~g8. In the footer of this main page you will see two links. One to access the mobile version and one to download the source code as a zip file. Choose the Download the zip file. After downloading, decompress where desired. To run the webpage just open the index.php or the mindex.php (mobile version) on a Firefox browser.

Data Modelling and Databases. Exercise Session 7: Integrity Constraints

Data Modelling and Databases. Exercise Session 7: Integrity Constraints Data Modelling and Databases Exercise Session 7: Integrity Constraints 1 Database Design Textual Description Complete Design ER Diagram Relational Schema Conceptual Modeling Logical Modeling Physical Modeling