Added sql structure for reference

shop.sql

@@ -0,0 +1,132 @@
+create database shop;
+
+use shop;
+
+create table user(
+	id int primary key auto_increment,
+	username varchar(64) not null unique,
+	displayname varchar(64) not null,
+	email varchar(64) not null unique,
+	password varchar(60) not null,
+	role_id int not null default 1,
+	creation_date timestamp default current_timestamp,
+	foreign key (role_id) references user_role(id)
+) auto_increment = 23001;
+
+create table user_role(
+	id int primary key auto_increment,
+	role varchar(32) not null unique
+);
+
+insert into user_role(role) values ('normal')
+insert into user_role(role) values ('admin')
+
+create table user_statistics(
+	id int primary key,
+	total_gains decimal(6,2) not null default 0.00,
+	sell_count int not null default 0,
+	total_spent decimal(6,2) not null default 0.00,
+	purchase_count int not null default 0,
+	foreign key (id) references user(id)
+);
+
+create table product(
+	id int primary key auto_increment,
+	seller_id int not null,
+	name varchar(32) not null,
+	price_pc decimal(6,2) not null,
+	image blob not null,
+	image_name varchar(64),
+	foreign key (seller_id) references user(id)
+);
+
+create table cart(
+	id int primary key,
+	price_total decimal(6,2) not null default 0.00,
+	item_count int not null default 0,
+	foreign key (id) references user(id)
+);
+
+create table cart_item(
+	id int primary key auto_increment,
+	cart_id int not null,
+	product_id int not null,
+	count int not null,
+	price_subtotal decimal(6,2) not null,
+	date_added datetime default current_timestamp,
+	foreign key (cart_id) references cart(id),
+	foreign key (product_id) references product(id)
+);
+
+create table purchase(
+	id int primary key auto_increment,
+	user_id int not null,
+	purchase_time datetime default current_timestamp,
+	price_total decimal(6,2) not null,
+	was_successful tinyint(1) not null,
+	foreign key (user_id) references user(id)
+);
+
+create table purchase_item(
+	id int primary key auto_increment,
+	purchase_id int not null,
+	product_id int not null,
+	count int not null,
+	price_subtotal decimal(6,2) not null,
+	foreign key (purchase_id) references purchase(id),
+	foreign key (product_id) references product(id)
+);
+
+delimiter //
+create trigger after_user_insert
+after insert
+on user for each row
+begin
+	insert into user_statistics(id) values (new.id);
+	insert into cart(id) values (new.id);
+end;
+//
+delimiter;
+
+delimiter //
+create trigger after_user_delete
+after delete
+on user for each row
+begin
+	delete from user_statistics where id = old.id;
+	delete from cart where id = old.id;
+end;
+//
+delimiter;
+
+delimiter //
+create trigger after_cart_insert
+after insert
+on cart_item for each row
+begin
+	update cart
+	set price_total = (
+		select sum(price_subtotal)
+		from cart_item
+		where cart_id = new.cart_id
+	)
+	where id = new.cart_id;
+end;
+//
+delimiter;
+
+delimiter //
+create trigger after_cart_delete
+after delete
+on cart_item for each row
+begin
+	update cart
+	set price_total = (
+		select sum(price_subtotal)
+		from cart_item
+		where cart_id = old.cart_id
+	)
+	where id = old.cart_id;
+end;
+//
+delimiter;