Store conflicts, provides and replaces in the DB

Package conflicts, provides and replaces are now stored in the new
PackageRelations table. The gendummydata script generates test entries
for these relations.

Signed-off-by: Lukas Fleischer <archlinux@cryptocrack.de>

schema/aur-schema.sql

@@ -160,6 +160,32 @@ CREATE TABLE PackageDepends (
 ) ENGINE = InnoDB;
 
 
+-- Define the package relation types
+--
+CREATE TABLE RelationTypes (
+	ID TINYINT UNSIGNED NOT NULL AUTO_INCREMENT,
+	Name VARCHAR(32) NOT NULL DEFAULT '',
+	PRIMARY KEY (ID)
+) ENGINE = InnoDB;
+INSERT INTO RelationTypes VALUES (1, 'conflicts');
+INSERT INTO RelationTypes VALUES (2, 'provides');
+INSERT INTO RelationTypes VALUES (3, 'replaces');
+
+
+-- Track which conflicts, provides and replaces a package has
+--
+CREATE TABLE PackageRelations (
+	PackageID INTEGER UNSIGNED NOT NULL,
+	RelTypeID TINYINT UNSIGNED NOT NULL,
+	RelName VARCHAR(255) NOT NULL,
+	RelCondition VARCHAR(20),
+	INDEX (PackageID),
+	INDEX (RelName),
+	FOREIGN KEY (PackageID) REFERENCES Packages(ID) ON DELETE CASCADE,
+	FOREIGN KEY (RelTypeID) REFERENCES RelationTypes(ID) ON DELETE NO ACTION
+) ENGINE = InnoDB;
+
+
 -- Track which sources a package has
 --
 CREATE TABLE PackageSources (