From 57730b9399696607b89fc7d2549f5d67594e46ca Mon Sep 17 00:00:00 2001
From: Sorrel Harriet <s.harriet@gold.ac.uk>
Date: Fri, 4 Nov 2016 14:19:12 +0000
Subject: [PATCH] initial work on lab 5 example code
---
lab-5/music-store-app/artist.php | 35 ++++++
lab-5/music-store-app/index.php | 45 ++++++++
lab-5/music-store-app/sql/dummy_data.sql | 66 +++++++++++
lab-5/music-store-app/sql/queries.sql | 100 ++++++++++++++++
lab-5/music-store-app/sql/schema.sql | 138 +++++++++++++++++++++++
5 files changed, 384 insertions(+)
create mode 100755 lab-5/music-store-app/artist.php
create mode 100755 lab-5/music-store-app/index.php
create mode 100755 lab-5/music-store-app/sql/dummy_data.sql
create mode 100755 lab-5/music-store-app/sql/queries.sql
create mode 100755 lab-5/music-store-app/sql/schema.sql
diff --git a/lab-5/music-store-app/artist.php b/lab-5/music-store-app/artist.php
new file mode 100755
index 0000000..f50a022
--- /dev/null
+++ b/lab-5/music-store-app/artist.php
@@ -0,0 +1,35 @@
+<?php
+
+/* connect to the database */
+$link = mysqli_connect(
+ 'localhost',
+ 'YOUR_USERNAME',
+ 'YOUR_PASSWORD',
+ 'YOUR_DB_NAME'
+);
+
+/* check connection succeeded */
+if (mysqli_connect_errno()) {
+ exit(mysqli_connect_error());
+}
+
+/* fetch a result set */
+$sql = "SELECT first_name, last_name FROM artist";
+$result = mysqli_query($link, $sql);
+
+/* check query returned a result */
+if ($result === false) {
+ echo mysqli_error($link);
+} else {
+ /* fetch associative array */
+ while ($row = mysqli_fetch_assoc($result)) {
+ echo($row['first_name']." (".$row['last_name'].") ");
+ }
+ /* free result set */
+ mysqli_free_result($result);
+}
+
+/* close the connection to the database */
+mysqli_close($link)
+
+?>
\ No newline at end of file
diff --git a/lab-5/music-store-app/index.php b/lab-5/music-store-app/index.php
new file mode 100755
index 0000000..de97e70
--- /dev/null
+++ b/lab-5/music-store-app/index.php
@@ -0,0 +1,45 @@
+<?php
+
+// open a new MySQL database connection
+
+// define a connection 'handle'
+$link = mysqli_connect(
+ 'localhost',
+ 'YOUR_USERNAME',
+ 'YOUR_PASSWORD',
+ 'YOUR_DB_NAME'
+);
+
+// check connection succeeded
+if (mysqli_connect_errno()) {
+ exit(mysqli_connect_error());
+}
+
+// define the SQL query to run (from lab 3!)
+$sql = "SELECT Album.title, Album.price, Artist.first_name, Artist.last_name, Genre.name AS genre, (SELECT COUNT(*) FROM Track WHERE Album.upc=Track.album_upc) AS num_tracks FROM Album
+LEFT JOIN Track ON Album.upc=Track.album_upc
+INNER JOIN Artist
+ ON Album.artist_id=Artist.id
+INNER JOIN Genre
+ ON Album.genre_id=Genre.id
+ORDER BY title ASC";
+$result = mysqli_query($link, $sql);
+
+// check query returned a result
+if ($result === false) {
+ echo mysqli_error($link);
+} else {
+ // $row_cnt = mysqli_num_rows($result);
+ // echo $row_cnt
+ // fetch associative array */
+ while ($row = mysqli_fetch_assoc($result)) {
+ echo($row['title']." (".$row['genre'].") ");
+ }
+ // free result set
+ mysqli_free_result($result);
+}
+
+// close the connection to the database */
+mysqli_close($link)
+
+?>
diff --git a/lab-5/music-store-app/sql/dummy_data.sql b/lab-5/music-store-app/sql/dummy_data.sql
new file mode 100755
index 0000000..382b373
--- /dev/null
+++ b/lab-5/music-store-app/sql/dummy_data.sql
@@ -0,0 +1,66 @@
+INSERT INTO Genre (name)
+VALUES
+('Reggae'),
+('Funk and Soul'),
+('Jazz'),
+('Classical'),
+('Electronic'),
+('Pop');
+
+INSERT INTO Band (name, genre_id)
+VALUES
+('The Wailers', 1),
+('The Aces', 2),
+('The Beatles', 6);
+
+INSERT INTO Artist (first_name, last_name, band_id)
+VALUES
+('Bob', 'Marley', 1),
+('Peter', 'Tosh', 1),
+('Burning', 'Spear', NULL),
+('Alton', 'Ellis', NULL),
+('Gregory', 'Issacs', NULL),
+('Desmond', 'Dekker', 2),
+('John', 'Lennon', 3),
+('Madonna', NULL, NULL);
+
+INSERT INTO Album (upc, title, release_year, artist_id, compilation, price, genre_id)
+VALUES
+('123425364732', 'Soul Rebel', 1970, 1, FALSE, 25.99, 1 ),
+('017263547261', 'Catch A Fire', 1973, 1, 0, 25.99, 1 ),
+('018263526272', 'Natty Dread', 1974, 1, 1, 20.99, 1 ),
+('018273527273', 'Babylon By Bus', 1978, 1, 'FALSE', 24.99, 1 ),
+('491827364626', 'Night Nurse', 1982, 5, TRUE, 17.99, 1 ),
+('018276272828', 'Mr Issacs', 1982, 5, 0, 9.99, 1 ),
+('018273662728', 'Black and Dekker', 1980, 6, 0, 19.99, 1 ),
+('726517237627', 'Sunday Coming', 1970, 4, TRUE, 15.99, 1 ),
+('018274372722', 'Imagine', 1971, 7, NULL, 11.99, 6 ),
+('018273727287', 'Like a Virgin', 1984, 8, 1, 9.99, 6 );
+
+INSERT INTO Track (name, album_upc, track_number)
+VALUES
+('Sunday Coming', '726517237627', 1),
+('Imagine', '018274372722', 1),
+('Material Girl', '018273727287', 1),
+('Angel', '018273727287', 2),
+('Crippled Inside', '018274372722', 2),
+('These Eyes', '726517237627', 2),
+('Hurting Me', '726517237627', 3);
+
+INSERT INTO Customer (username, email_address, password, first_name, last_name, address_1, address_2, postcode)
+VALUES
+('sharr003', 's.harriet@gold.ac.uk', 'SOME_HASHED_VALUE', 'Sorrel', 'Harriet', '12 Fake Street', 'London', 'SE140PL'),
+('ktack001', 'k.tackie@hotmail.com', 'SOME_HASHED_VALUE', 'Kobi', 'Tackie', '12 Fake Street', 'London', 'SE140PL');
+
+INSERT INTO Transaction (customer_id, delivery)
+VALUES
+(1, 'next working day'),
+(1, 'first class'),
+(2, 'second class');
+
+INSERT INTO LineItem (trans_id, album_upc, quantity)
+VALUES
+(1, '018273727287', 1),
+(2, '018273727287', 1),
+(3, '491827364626', 1),
+(1, '018274372722', 2);
diff --git a/lab-5/music-store-app/sql/queries.sql b/lab-5/music-store-app/sql/queries.sql
new file mode 100755
index 0000000..50ec236
--- /dev/null
+++ b/lab-5/music-store-app/sql/queries.sql
@@ -0,0 +1,100 @@
+/* Minimum functional requirements of
+Music Store App and their associated queries.
+Where variations are given they are
+given in order of increasing complexity */
+
+/* 1a. Retrieve a list of Albums
+Include the UPC, title, price, artist name
+and genre in the result-set.
+Order by title (a-z) */
+SELECT Album.title, Album.price, Artist.first_name, Artist.last_name, Genre.name AS genre
+FROM Album /* notice the use of a column alias! */
+INNER JOIN Artist
+ ON Album.artist_id=Artist.id
+INNER JOIN Genre
+ ON Album.genre_id=Genre.id
+ORDER BY title ASC; /* causes results to be ordered by album title */
+
+/* 1b. Retrieve a list of Albums
+Include the UPC, title, price, artist name,
+genre, and number of tracks in the result-set.
+Include only albums which have tracks in DB.
+Order by title (a-z) */
+SELECT Album.title, Album.price, Artist.first_name, Artist.last_name, Genre.name AS genre, (SELECT COUNT(*) FROM Track WHERE Album.upc=Track.album_upc) AS num_tracks
+FROM Album /* notice the nested query, aggregate function and aliases! */
+INNER JOIN Track
+ ON Album.upc=Track.album_upc
+INNER JOIN Artist
+ ON Album.artist_id=Artist.id
+INNER JOIN Genre
+ ON Album.genre_id=Genre.id
+ORDER BY title ASC;
+
+/* 1c. Retrieve a list of Albums
+Include the UPC, title, price, artist name,
+genre, and number of tracks in the result-set.
+Include ALL albums, even those without tracks.
+Order by title (a-z) */
+SELECT Album.title, Album.price, Artist.first_name, Artist.last_name, Genre.name AS genre, (SELECT COUNT(*) FROM Track WHERE Album.upc=Track.album_upc) AS num_tracks
+FROM Album /* notice the nested query, aggregate function and aliases! */
+LEFT JOIN Track /* LEFT JOIN causes all Albums to be returned, even when no matching record in Track table */
+ ON Album.upc=Track.album_upc
+INNER JOIN Artist
+ ON Album.artist_id=Artist.id
+INNER JOIN Genre
+ ON Album.genre_id=Genre.id
+ORDER BY title ASC;
+
+/* ------------------------------------ */
+
+/* 2. Retrieve a list of tracks
+associated with a specific album */
+SELECT t.name AS track, t.track_number, a.title AS album /* notice use of column aliases! */
+FROM Track t /* notice use of table aliases! */
+INNER JOIN Album a
+ ON t.album_upc=a.upc
+WHERE a.upc='018274372722' /* EXAMPLE */
+ORDER BY track_number ASC;
+
+/* ------------------------------------ */
+
+/* 3. Insert a new track */
+INSERT INTO Track (name, album_upc, track_number)
+VALUES
+('Sunday Coming', '726517237627', 1); /* EXAMPLE */
+
+/* ------------------------------------ */
+
+/* 4. Delete a track */
+DELETE FROM Track WHERE album_upc='726517237627'; /* EXAMPLE */
+
+/* ------------------------------------ */
+
+/* 5a. Retrieve details about an order
+Include the customer_id, delivery method
+and total order value in the result-set */
+
+SELECT Transaction.customer_id, Transaction.delivery, SUM(Album.price*LineItem.quantity) AS order_total /* notice use of aggregate function! */
+FROM Transaction
+INNER JOIN LineItem
+ ON Transaction.id=LineItem.trans_id
+INNER JOIN Album
+ ON Album.upc=LineItem.album_upc
+WHERE Transaction.id=1; /* EXAMPLE */
+
+/* 5b. Retrieve details about an order
+Include the transaction id, customer_id
+and the number of items ordered in the
+result-set */
+SELECT t.id, t.customer_id, SUM(li.quantity) AS num_items
+FROM Transaction t
+INNER JOIN LineItem li
+ ON t.id=li.trans_id
+GROUP BY t.id; /* group results by transaction id */
+
+/* 5c. Does the same as the previous query
+but using a nested query rather than a JOIN */
+SELECT t.id, t.customer_id,
+(SELECT SUM(li.quantity) FROM LineItem li
+ WHERE li.trans_id=t.id) AS num_items
+FROM Transaction t;
diff --git a/lab-5/music-store-app/sql/schema.sql b/lab-5/music-store-app/sql/schema.sql
new file mode 100755
index 0000000..8d8f95a
--- /dev/null
+++ b/lab-5/music-store-app/sql/schema.sql
@@ -0,0 +1,138 @@
+/* Delete existing tables in reverse order of creation
+so as not to violate any foreign key constraints */
+DROP TABLE IF EXISTS Rating, Wish, LineItem, Transaction, Customer, Track, Album, Artist, Band, Genre;
+
+/* Define table for genres */
+CREATE TABLE Genre (
+ id INT AUTO_INCREMENT,
+ name VARCHAR(25) UNIQUE NOT NULL,
+ PRIMARY KEY (id)
+);
+
+/* Define table for storing act (i.e. a group or solo artist)
+ON DELETE CASCADE not used in this case as we don't want bands
+being deleted if their genre is deleted. We'd rather an error
+was raised. */
+CREATE TABLE Band (
+ id INT AUTO_INCREMENT,
+ name VARCHAR(50) NOT NULL,
+ genre_id INT,
+ PRIMARY KEY (id),
+ FOREIGN KEY (genre_id)
+ REFERENCES Genre (id)
+);
+
+/* Define table for storing artists */
+CREATE TABLE Artist (
+ id INT AUTO_INCREMENT,
+ first_name VARCHAR(25) NOT NULL,
+ last_name VARCHAR(25),
+ band_id INT,
+ PRIMARY KEY (id),
+ FOREIGN KEY (band_id)
+ REFERENCES Band (id)
+);
+
+/* Define table for storing albums */
+CREATE TABLE Album (
+ upc CHAR(12),
+ title VARCHAR(50) NOT NULL,
+ release_year YEAR(4),
+ artist_id INT,
+ compilation BOOLEAN NOT NULL DEFAULT 0,
+ price DECIMAL(5, 2) unsigned NOT NULL,
+ genre_id INT,
+ PRIMARY KEY (upc),
+ FOREIGN KEY (artist_id)
+ REFERENCES Artist (id),
+ FOREIGN KEY (genre_id)
+ REFERENCES Genre (id)
+);
+
+
+/* Define table for storing single tracks
+ON DELETE CASCADE will ensure no track
+is left that isn't linked to an album.
+ON UPDATE CASCADE will inherit any changes
+to the Album UPC (Universal Product Code).
+A composite PRIMARY KEY is used here to
+ensure the track_number is unique
+on any given album */
+CREATE TABLE Track (
+ name VARCHAR(50) NOT NULL,
+ album_upc CHAR(12) NOT NULL,
+ track_number INT,
+ PRIMARY KEY (album_upc, track_number),
+ FOREIGN KEY (album_upc)
+ REFERENCES Album (upc)
+ ON UPDATE CASCADE
+ ON DELETE CASCADE
+);
+
+/* Define table for storing customers */
+CREATE TABLE Customer (
+ id INT AUTO_INCREMENT,
+ username VARCHAR(25) UNIQUE NOT NULL,
+ email_address VARCHAR(50) UNIQUE NOT NULL,
+ password VARCHAR(64), /* will store a hashed password */
+ first_name VARCHAR(50) NOT NULL,
+ last_name VARCHAR(50) NOT NULL,
+ address_1 VARCHAR(50) NOT NULL,
+ address_2 VARCHAR(50),
+ postcode VARCHAR(10) NOT NULL,
+ PRIMARY KEY (id)
+);
+
+/* Define table for storing orders */
+CREATE TABLE Transaction (
+ id INT AUTO_INCREMENT,
+ customer_id INT NOT NULL,
+ delivery ENUM('first class','second class','next working day'),
+ PRIMARY KEY (id),
+ FOREIGN KEY (customer_id)
+ REFERENCES Customer(id)
+ ON DELETE CASCADE
+);
+
+/* Define table for storing line items */
+CREATE TABLE LineItem (
+ id INT AUTO_INCREMENT,
+ trans_id INT NOT NULL,
+ album_upc CHAR(12) NOT NULL,
+ quantity INT NOT NULL DEFAULT 1,
+ PRIMARY KEY (id),
+ FOREIGN KEY (trans_id)
+ REFERENCES Transaction (id)
+ ON DELETE CASCADE,
+ FOREIGN KEY (album_upc)
+ REFERENCES Album (upc)
+ ON DELETE CASCADE
+);
+
+/* Define table to store customer 'wishes'.
+Compile wishlists from this data. */
+CREATE TABLE Wish (
+ customer_id INT,
+ album_upc CHAR(12) NOT NULL,
+ PRIMARY KEY (customer_id, album_upc),
+ FOREIGN KEY (customer_id)
+ REFERENCES Customer(id)
+ ON DELETE CASCADE,
+ FOREIGN KEY (album_upc)
+ REFERENCES Album (upc)
+ ON DELETE CASCADE
+);
+
+/* Define table for storing customer ratingsfor albums */
+CREATE TABLE Rating (
+ customer_id INT NOT NULL,
+ album_upc CHAR(12) NOT NULL,
+ score TINYINT unsigned NOT NULL,
+ PRIMARY KEY (customer_id, album_upc),
+ FOREIGN KEY (customer_id)
+ REFERENCES Customer(id)
+ ON DELETE CASCADE,
+ FOREIGN KEY (album_upc)
+ REFERENCES Album (upc)
+ ON DELETE CASCADE
+);
--
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