/**
 * $Id: create_repository.mysql,v 1.1 2000/12/10 07:00:47 mdb Exp $
 *
 * Creates the necessary database tables in MySQL for the music repository.
 */

/**
 * The entries table contains a row for every entry (album, single, etc.)
 * in the repository.
 */
DROP TABLE IF EXISTS entries;
CREATE TABLE entries (
	entryid INTEGER(10) PRIMARY KEY AUTO_INCREMENT,
	title   VARCHAR(200) NOT NULL,
	artist  VARCHAR(200) NOT NULL,
	source  VARCHAR(20) NOT NULL
);

/**
 * The songs associated with every entry are all stored in the songs table.
 */
DROP TABLE IF EXISTS songs;
CREATE TABLE songs (
	songid   INTEGER(10) PRIMARY KEY AUTO_INCREMENT,
	entryid  INTEGER(10) NOT NULL,
	position INTEGER(10) NOT NULL,
	title    VARCHAR(200) NOT NULL,
	location VARCHAR(200) NOT NULL,
	duration INTEGER(10) NOT NULL,

	CONSTRAINT fk_songs_entries FOREIGN KEY (entryid) 
	  REFERENCES entries (entryid) ON DELETE CASCADE
);
CREATE INDEX entryid_idx ON songs (entryid);

/**
 * Categories are generally referred to by their name which is defined in
 * this table.
 */
DROP TABLE IF EXISTS category_names;
CREATE TABLE category_names (
	categoryid INTEGER(10) PRIMARY KEY AUTO_INCREMENT,
	name       VARCHAR(100) NOT NULL,

	UNIQUE (name)
);

/**
 * Entries are mapped into one or more categories via this table.
 */
DROP TABLE IF EXISTS category_map;
CREATE TABLE category_map (
	categoryid INTEGER(10) NOT NULL,
	entryid    INTEGER(10) NOT NULL,

	CONSTRAINT fk_category_map_category_names FOREIGN KEY (categoryid) 
	  REFERENCES category_names (categoryid) ON DELETE CASCADE,
	CONSTRAINT fk_category_map_entries FOREIGN KEY (entryid) 
	  REFERENCES entries (entryid) ON DELETE CASCADE,

        UNIQUE (categoryid, entryid)
);