Database updates for sample roasting feature.

config/Windows/navigation.xml

 			query.exec("INSERT INTO TypicaFeatures VALUES('base-features', TRUE, 1)");
 			query = query.invalidate();
 		};
+		
+		/* Some changes to the database are required for sample roasting features in
+		   Typica 1.6 and later. */
+		var DBCreateSampleRoasting = function() {
+			var query = new QSqlQuery;
+			query.exec("CREATE OR REPLACE FUNCTION log_use() RETURNS trigger AS $$ DECLARE i integer := array_lower(NEW.unroasted_id, 1); u integer := array_upper(NEW.unroasted_id, 1); BEGIN IF NEW.transaction_type = 'ROAST' THEN WHILE i <= u LOOP INSERT INTO use VALUES(NEW.time, NEW.unroasted_id[i], NEW.unroasted_quantity[i]); i := i + 1; END LOOP; END IF; RETURN NEW; END; $$ LANGUAGE plpgsql");
+			query.exec("CREATE TABLE IF NOT EXISTS item_attributes (id bigint PRIMARY KEY NOT NULL, name text NOT NULL)");
+			query.exec("CREATE TABLE IF NOT EXISTS coffee_sample_items(arrival timestamp without time zone, vendor text, attribute_ids bigint[], attribute_values text[]. item_id bigint) INHERITS (items)");
+			query.exec("INSERT INTO TypicaFeatures VALUES('sample-roasting', TRUE, 1)");
+			query = query.invalidate();
+		};
+
 		query = new QSqlQuery();
 		/* A table keeps track of database versioning information. This table is created
 		   if required. */
 		{
 			DBCreateBase();
 		}
+		query.exec("SELECT feature, enabled, version FROM TypicaFeatures WHERE feature = 'sample-roasting'");
+		if(query.next())
+		{
+			if(query.value(2) < 1)
+			{
+				DBCreateSampleRoasting();
+			}
+		}
+		else
+		{
+			DBCreateSampleRoasting();
+		}
+		query = query.invalidate();
         ]]>
     </program>
 </window>