Indian Institute of Technology, Indore
Computer Science & Engineering
CS 257: Lab Assignment on Case Study
Music Player & Music Management System
Submitted By:
Kunal Gupta 150001015
Punit Lakshwani 150001025
Shivam Tayal 150001034
STEP-WISE ANALYSIS OF CASE STUDY
Track – Songs that will played in the Music Player.
Artist – Artists of the songs in the track entity.
Album – Album of the songs in track entity.
Playlist – Playlists created by user.
Directories – Location of folder where tracks are located.
2.Modeling Attributes and Keys:
1.Track:
TrackId
Trackname
Location
Genre
DateAdded
Favourite
Primary key: (TrackId)
Tracks are the songs and music files in the system. Each track will be given unique TrackID.
TrackId : Track ID of the track.
Trackname : Track name of the track.
Location : Location of track in the system.
Genre : Genre of the track (like pop, dance, jazz, etc.).
DateAdded : The date on which the track was added to the database.
Favourite : Boolean flag which is true if song is added to favourites else false.
2.Artist:
ArtistId
Artistname
Primary key: (ArtistId)
Artist entity contains the different artist ids and artist names.
ArtistId : Unique Id given to the artist.
Artistname : Name of the Artist.
3.Album:
AlbumId
Albumname
Primary key: (AlbumId)
Album entity contains the different album names and their unique ids.
AlbumId : Unique id given to a album.
Albumname : Name of the Album.
4.Playlist:
PlaylistId
Playlistname
Primary key: (PlaylistId)
Playlist entity contains the all the playlists created by users.
PlaylistId : Unique id given to each playlist.
Playlistname : Name of the playlist given by user.
5.Directories:
FolderLocation
Primary key: (FolderLocation)
Directories contains the address of the the select directories.
FolderLocation : Location of the directory.
3. Identification of Relationships:
Track, Artist and Album are related to each other. TrackInfo contains the artist and album of each track.
PlayList and Track are related to each other. PlayListInfo contains the track and playlist ids along with the order of track in playlist.
Directories contains tracks. TrackLocation relates track to its directory.
S.No. | Relationship | Entity Sets |
1 | TrackInfo | Track, Artist, Album |
4 | PlaylistInfo | Playlist, Track |
5 | TrackLocation | Directories,Track |
A.TrackInfo : (Track, Artist, Album)
Type : Ternary Relationship
Mapping cardinality
Track Artist : (m : 1)
Track Album : (m : 1)
Artist Album : (1 : m)
Track : Total participation
Artist : Total participation
Album : Total participation
B.PlaylistInfo : (PlayList, Track)
Type : Binary Relationship
Mapping cardinality : (m : n)
Playlist : Total participation
Track : Partial participation
C.TrackLocation : (Directories, Track)
Type : Binary Relationship
Mapping cardinality : (1 : m)
Directories : Partial participation
Track : Total participation
Entity sets into tables :
1)Track :
TrackId int PRIMARY KEY NOT NULL,
Trackname varchar(50) NOT NULL,
Location varchar(500) NOT NULL UNIQUE,
DateAdded timestamp CURRENTTIMESTAMP,
Genre varchar(30) NOT NULL,
Favourite boolean DEFAULT (0)
2)Artist :
ArtistId int PRIMARY KEY NOT NULL,
Artistname varchar(50) NOT NULL UNIQUE
3)Album :
AlbumId int PRIMARY KEY NOT NULL,
Albumname varchar(50) NOT NULL UNIQUE
4)Playlist :
PlaylistId int PRIMARY KEY NOT NULL,
Playlistname varchar(100) NOT NULL UNIQUE
5)Directories :
FolderLocation varchar(500) NOT NULL UNIQUE
Relationships into tables :
1)TrackInfo :
Primary Key (TrackId)
Foriegn Key (ArtistId, AlbumId)
2)PlayListInfo:
Primary Key (PlayListId, TrackId)
Trackorder int NOT NULL
3)TrackLocation:
Primary Key (Track.Location)
Foriegn Key (FolderLocation)
1) Search for a artist
CREATE FUNCTION searchartist (name varchar(50)) RETURNS int(11)
BEGIN
declare id int;
set id = (select artistid from artist where artistname = name);
if (id > 0) then
return id;
end if;
RETURN -1;
END
2) Search for a album
CREATE FUNCTION searchalbum (name varchar(50)) RETURNS int(11)
BEGIN
declare id int;
set id = (select albumid from artist where albumname = name);
if (id > 0) then
return id;
end if;
RETURN -1;
END
1)Adding a Directory
CREATE PROCEDURE adddirectory (in location varchar(500))
BEGIN
insert into directories values (location);
END
2)Adding a Track
CREATE PROCEDURE addtrack(in trackname varchar(50),in artistname varchar(50),in albumname varchar(100),in location varchar(500),in genre varchar(30))
Begin
declare artistid int;
declare albumid int;
declare trackid int;
set trackid = (select newid from id);
set artistid = searchartist(artistname);
set albumid = searchalbum(albumname);
insert into track(trackid,trackname,location,genre) values(trackid, trackname, location, genre);
if (artistid = -1) then
set artistid = (select newid from id);
insert into artist values (artistid, artistname);
end if;
if (albumid = -1) then
set albumid = (select newid from id);
insert into album values (albumid, albumname);
end if;
insert into trackinfo values (trackid, artistid, albumid);
end
3) Adding a Track to a Playlist
CREATE PROCEDURE addtracktoplaylist (in pid int,in tid int)
BEGIN
declare torder int;
set torder = (select count(*) from playlistinfo where playlistid=pid);
set torder = torder + 1;
insert into playlistinfo values(pid,tid,torder);
END
4) Creating a PlayList
CREATE PROCEDURE createplaylist (in PlaylistName varchar(100))
BEGIN
declare pid int;
set pid = (select playlistid from id);
insert into playlist values(pid,PlaylistName);
END
5) Deleting a Directory
CREATE PROCEDURE deletedirectory (in location varchar(500))
BEGIN
declare tid int;
declare trackids cursor for select trackid from track where track.location like concat(location, '%'); delete from directories where folderlocation = location;
open trackids;
get_trackid : LOOP
fetch trackids into tid;
call deletetrack(tid);
end loop get_trackid;
close trackids;
END
6) Deleting a track from a playlist
CREATE PROCEDURE deletefromplaylist (in pid int,in tid int)
BEGIN
declare torder int;
set torder=(select trackorder from playlistinfo where playlistid=pid and trackid=tid);
delete from playlistinfo where playlistid=pid and trackid=tid;
update playlistinfo set trackorder=trackorder-1 where playlistid=pid and trackorder>torder;
END
7) Deleting a playlist
CREATE PROCEDURE deleteplaylist (in pid int)
BEGIN
delete from playlist where playlistid=pid;
delete from playlistinfo where playlistid=pid;
END
8) Deleting a track
CREATE PROCEDURE deletetrack (in TrackId int)
BEGIN
delete from track where track.trackid=TrackId;
delete from trackinfo where trackinfo.trackid=TrackId;
delete from playlistinfo where playlistinfo.trackid=TrackId;
END
9) Adding a track to Favourites
CREATE PROCEDURE favourite (in TrackId int)
BEGIN
update track set favourite=True where track.trackid=TrackId;
END
10) Moving a track in playlist (up or down)
CREATE PROCEDURE movetrack (in pid int, in tid int, in direction int)
BEGIN
declare swaptid int;
declare torder int;
set torder = (select trackorder from playlistinfo where playlistid = pid and trackid = tid);
if(direction = 0) then
set swaptid = (select trackid from playlistinfo where playlistid = pid and trackorder = torder - 1);
update playlistinfo set trackorder = torder where playlistid = pid and trackid = swaptid;
update playlistinfo set trackorder = torder - 1 where playlistid = pid and trackid = tid;
else
set swaptid = (select trackid from playlistinfo where playlistid = pid and trackorder = torder + 1);
update playlistinfo set trackorder = torder where playlistid = pid and trackid = swaptid;
update playlistinfo set trackorder = torder + 1 where playlistid = pid and trackid = tid;
end if;
END
11) Removing a track from Favourites
CREATE PROCEDURE unfavourite (in TrackId int)
BEGIN
update track set favourite=false where track.trackid=TrackId;
END
12) Update a playlist name
CREATE PROCEDURE updateplaylist (in pid int, in newname varchar(50))
BEGIN
update playlist set playlistname = newname where playlistid = pid;
END
13) Updating a track information
CREATE PROCEDURE updatetrack (in TrackId int,in newtrack varchar(50),in newartist varchar(50),in newalbum varchar(100),in newgenre varchar(30))
BEGIN
declare ArtistId int;
declare AlbumId int;
update track set trackname = newtrack, genre = newgenre where track.trackid = TrackId;
set ArtistId=searchartist(newartist);
set AlbumId=searchalbum(newalbum);
if (ArtistId = -1) then
set ArtistId=(select newid from id);
insert into artist values (ArtistId,newartist);
end if;
if (AlbumId = -1) then
set AlbumId = (select newid from id);
insert into album values (AlbumId,newalbum);
end if;
update trackinfo set artistid=ArtistId, albumid=AlbumId where trackinfo.trackid = TrackId;
END
1) Refresh artist and album after delete in trackinfo
CREATE TRIGGER deleterefresh AFTER DELETE ON trackinfo
FOR EACH ROW
BEGIN
DELETE FROM album WHERE albumid NOT IN (SELECT DISTINCT albumid FROM trackinfo);
DELETE FROM artist WHERE artistid NOT IN (SELECT DISTINCT artistid FROM trackinfo);
END
2) Refresh artist and album after update in trackinfo
CREATE TRIGGER deleterefresh AFTER UPDATE ON trackinfo
FOR EACH ROW
BEGIN
DELETE FROM album WHERE albumid NOT IN (SELECT DISTINCT albumid FROM trackinfo);
DELETE FROM artist WHERE artistid NOT IN (SELECT DISTINCT artistid FROM trackinfo);
END
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+ Indian Institute of Technology, Indore +
++ Computer Science & Engineering +
++ CS 257: Lab Assignment on Case Study +
++ Music Player & Music Management System +
++ Submitted By: +
++ Kunal Gupta 150001015 +
++ Punit Lakshwani 150001025 +
++ Shivam Tayal 150001034 +
++ STEP-WISE ANALYSIS OF CASE STUDY +
++ Track – Songs that will played in the Music Player. +
++ Artist – Artists of the songs in the track entity. +
++ Album – Album of the songs in track entity. +
++ Playlist – Playlists created by user. +
++ Directories – Location of folder where tracks are located. +
++ 2.Modeling Attributes and Keys: +
++ Track: +
++ TrackId +
++ Trackname +
++ Location +
++ Genre +
++ DateAdded +
++ Favourite +
++ Primary key: + (TrackId) +
++ Tracks are the songs and music files in the system. Each track will be given unique TrackID. +
++ TrackId : Track ID of the track. +
++ Trackname : Track name of the track. +
++ Location : Location of track in the system. +
++ Genre : Genre of the track (like pop, dance, jazz, etc.). +
++ DateAdded : The date on which the track was added to the database. +
++ Favourite : Boolean flag which is true if song is added to favourites else false. +
++ Artist: +
++ ArtistId +
++ Artistname +
++ Primary key: + (ArtistId) +
++ Artist entity contains the different artist ids and artist names. +
++ ArtistId : Unique Id given to the artist. +
++ Artistname : Name of the Artist. +
++ Album: +
++ AlbumId +
++ Albumname +
++ Primary key: + (AlbumId) +
++ Album entity contains the different album names and their unique ids. +
++ AlbumId : Unique id given to a album. +
++ Albumname : Name of the Album. +
++ Playlist: +
++ PlaylistId +
++ Playlistname +
++ Primary key: + (PlaylistId) +
++ Playlist entity contains the all the playlists created by users. +
++ PlaylistId : Unique id given to each playlist. +
++ Playlistname : Name of the playlist given by user. +
++ Directories: +
++ FolderLocation +
++ Primary key: + (FolderLocation) +
++ Directories contains the address of the the select directories. +
++ FolderLocation : Location of the directory. +
++ 3. Identification of Relationships: +
++ Track, Artist and Album are related to each other. TrackInfo contains the artist and album of each track. +
++ PlayList and Track are related to each other. PlayListInfo contains the track and playlist ids along with the order of track in playlist. +
++ Directories contains tracks. TrackLocation relates track to its directory. +
+|
+ + S.No. + + |
+
+ + Relationship + + |
+
+ + Entity Sets + + |
+
|
+ + 1 + + |
+
+ + TrackInfo + + |
+
+ + Track, Artist, Album + + |
+
|
+ + 4 + + |
+
+ + PlaylistInfo + + |
+
+ + Playlist, Track + + |
+
|
+ + 5 + + |
+
+ + TrackLocation + + |
+
+ + Directories,Track + + |
+
+ TrackInfo + : (Track, Artist, Album) +
++ Type + : Ternary Relationship +
++ Mapping cardinality +
++ Track Artist : (m : 1) +
++ Track Album : (m : 1) +
++ Artist Album : (1 : m) +
++ Track : Total participation +
++ Artist : Total participation +
++ Album : Total participation +
++ PlaylistInfo + : (PlayList, Track) +
++ Type + : Binary Relationship +
++ Mapping cardinality : (m : n) +
++ Playlist : Total participation +
++ Track : Partial participation +
++ TrackLocation + : (Directories, Track) +
++ Type + : Binary Relationship +
++ Mapping cardinality : (1 : m) +
++ Directories : Partial participation +
++ Track : Total participation +
++ Entity sets into tables : +
++ Track : +
++ TrackId int PRIMARY KEY NOT NULL, +
++ Trackname varchar(50) NOT NULL, +
++ Location varchar(500) NOT NULL UNIQUE, +
++ DateAdded timestamp CURRENTTIMESTAMP, +
++ Genre varchar(30) NOT NULL, +
++ Favourite boolean DEFAULT (0) +
++ Artist : +
++ ArtistId int PRIMARY KEY NOT NULL, +
++ Artistname varchar(50) NOT NULL UNIQUE +
++ Album : +
++ AlbumId int PRIMARY KEY NOT NULL, +
++ Albumname varchar(50) NOT NULL UNIQUE +
++ Playlist : +
++ PlaylistId int PRIMARY KEY NOT NULL, +
++ Playlistname varchar(100) NOT NULL UNIQUE +
++ Directories : +
++ FolderLocation varchar(500) NOT NULL UNIQUE +
++ Relationships into tables : +
++ TrackInfo : +
++ Primary Key (TrackId) +
++ Foriegn Key (ArtistId, AlbumId) +
++ PlayListInfo: +
++ Primary Key (PlayListId, TrackId) +
++ Trackorder int NOT NULL +
++ TrackLocation: +
++ Primary Key (Track.Location) +
++ Foriegn Key (FolderLocation) +
++ 1) Search for a artist +
++ CREATE FUNCTION searchartist (name varchar(50)) RETURNS int(11) +
++ BEGIN +
++ declare id int; +
++ set id = (select artistid from artist where artistname = name); +
++ if (id > 0) then +
++ return id; +
++ end if; +
++ RETURN -1; +
++ END +
++ 2) Search for a album +
++ CREATE FUNCTION searchalbum (name varchar(50)) RETURNS int(11) +
++ BEGIN +
++ declare id int; +
++ set id = (select albumid from artist where albumname = name); +
++ if (id > 0) then +
++ return id; +
++ end if; +
++ RETURN -1; +
++ END +
++ Adding a Directory +
++ CREATE PROCEDURE adddirectory (in location varchar(500)) +
++ BEGIN +
++ insert into directories values (location); +
++ END +
++ Adding a Track +
++ CREATE PROCEDURE addtrack(in trackname varchar(50),in artistname varchar(50),in albumname varchar(100),in location varchar(500),in genre varchar(30)) +
++ Begin +
++ declare artistid int; +
++ declare albumid int; +
++ declare trackid int; +
++ set trackid = (select newid from id); +
++ set artistid = searchartist(artistname); +
++ set albumid = searchalbum(albumname); +
++ insert into track(trackid,trackname,location,genre) values(trackid, trackname, location, genre); +
++ if (artistid = -1) then +
++ set artistid = (select newid from id); +
++ insert into artist values (artistid, artistname); +
++ end if; +
++ if (albumid = -1) then +
++ set albumid = (select newid from id); +
++ insert into album values (albumid, albumname); +
++ end if; +
++ insert into trackinfo values (trackid, artistid, albumid); +
++ end +
++ 3) Adding a Track to a Playlist +
++ CREATE PROCEDURE addtracktoplaylist (in pid int,in tid int) +
++ BEGIN +
++ declare torder int; +
++ set torder = (select count(*) from playlistinfo where playlistid=pid); +
++ set torder = torder + 1; +
++ insert into playlistinfo values(pid,tid,torder); +
++ END +
++ 4) Creating a PlayList +
++ CREATE PROCEDURE createplaylist (in PlaylistName varchar(100)) +
++ BEGIN +
++ declare pid int; +
++ set pid = (select playlistid from id); +
++ insert into playlist values(pid,PlaylistName); +
++ END +
++ 5) Deleting a Directory +
++ CREATE PROCEDURE deletedirectory (in location varchar(500)) +
++ BEGIN +
++ declare tid int; +
++ declare trackids cursor for select trackid from track where track.location like concat(location, '%'); delete from directories where folderlocation = + location; +
++ open trackids; +
++ get_trackid : LOOP +
++ fetch trackids into tid; +
++ call deletetrack(tid); +
++ end loop get_trackid; +
++ close trackids; +
++ END +
++ 6) Deleting a track from a playlist +
++ CREATE PROCEDURE deletefromplaylist (in pid int,in tid int) +
++ BEGIN +
++ declare torder int; +
++ set torder=(select trackorder from playlistinfo where playlistid=pid and trackid=tid); +
++ delete from playlistinfo where playlistid=pid and trackid=tid; +
++ update playlistinfo set trackorder=trackorder-1 where playlistid=pid and trackorder>torder; +
++ END +
++ 7) Deleting a playlist +
++ CREATE PROCEDURE deleteplaylist (in pid int) +
++ BEGIN +
++ delete from playlist where playlistid=pid; +
++ delete from playlistinfo where playlistid=pid; +
++ END +
++ 8) Deleting a track +
++ CREATE PROCEDURE deletetrack (in TrackId int) +
++ BEGIN +
++ delete from track where track.trackid=TrackId; +
++ delete from trackinfo where trackinfo.trackid=TrackId; +
++ delete from playlistinfo where playlistinfo.trackid=TrackId; +
++ END +
++ 9) Adding a track to Favourites +
++ CREATE PROCEDURE favourite (in TrackId int) +
++ BEGIN +
++ update track set favourite=True where track.trackid=TrackId; +
++ END +
++ 10) Moving a track in playlist (up or down) +
++ CREATE PROCEDURE movetrack (in pid int, in tid int, in direction int) +
++ BEGIN +
++ declare swaptid int; +
++ declare torder int; +
++ set torder = (select trackorder from playlistinfo where playlistid = pid and trackid = tid); +
++ if(direction = 0) then +
++ set swaptid = (select trackid from playlistinfo where playlistid = pid and trackorder = torder - 1); +
++ update playlistinfo set trackorder = torder where playlistid = pid and trackid = swaptid; +
++ update playlistinfo set trackorder = torder - 1 where playlistid = pid and trackid = tid; +
++ else +
++ set swaptid = (select trackid from playlistinfo where playlistid = pid and trackorder = torder + 1); +
++ update playlistinfo set trackorder = torder where playlistid = pid and trackid = swaptid; +
++ update playlistinfo set trackorder = torder + 1 where playlistid = pid and trackid = tid; +
++ end if; +
++ END +
++ 11) Removing a track from Favourites +
++ CREATE PROCEDURE unfavourite (in TrackId int) +
++ BEGIN +
++ update track set favourite=false where track.trackid=TrackId; +
++ END +
++ 12) Update a playlist name +
++ CREATE PROCEDURE updateplaylist (in pid int, in newname varchar(50)) +
++ BEGIN +
++ update playlist set playlistname = newname where playlistid = pid; +
++ END +
++ 13) Updating a track information +
++ CREATE PROCEDURE updatetrack (in TrackId int,in newtrack varchar(50),in newartist varchar(50),in newalbum varchar(100),in newgenre varchar(30)) +
++ BEGIN +
++ declare ArtistId int; +
++ declare AlbumId int; +
++ update track set trackname = newtrack, genre = newgenre where track.trackid = TrackId; +
++ set ArtistId=searchartist(newartist); +
++ set AlbumId=searchalbum(newalbum); +
++ if (ArtistId = -1) then +
++ set ArtistId=(select newid from id); +
++ insert into artist values (ArtistId,newartist); +
++ end if; +
++ if (AlbumId = -1) then +
++ set AlbumId = (select newid from id); +
++ insert into album values (AlbumId,newalbum); +
++ end if; +
++ update trackinfo set artistid=ArtistId, albumid=AlbumId where trackinfo.trackid = TrackId; +
++ END +
++ 1) Refresh artist and album after delete in trackinfo +
++ CREATE TRIGGER deleterefresh AFTER DELETE ON trackinfo +
++ FOR EACH ROW +
++ BEGIN +
++ DELETE FROM album WHERE albumid NOT IN (SELECT DISTINCT albumid FROM trackinfo); +
++ DELETE FROM artist WHERE artistid NOT IN (SELECT DISTINCT artistid FROM trackinfo); +
++ END +
++ 2) Refresh artist and album after update in trackinfo +
++ CREATE TRIGGER deleterefresh AFTER UPDATE ON trackinfo +
++ FOR EACH ROW +
++ BEGIN +
++ DELETE FROM album WHERE albumid NOT IN (SELECT DISTINCT albumid FROM trackinfo); +
++ DELETE FROM artist WHERE artistid NOT IN (SELECT DISTINCT artistid FROM trackinfo); +
++ END +
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