Expanded Message model by getId(); added tests for both supported api layers.

src/main/java/de/fabianonline/telegram_backup/models/Message.java

@@ -8,18 +8,24 @@ public class Message {
 	protected static String tableName = "messages";
 	private JsonObject json;
 	private String message = null;
-	
+	private Integer id = null;
+
 	public Message(String json) {
 		this.json = new JsonParser().parse(json).getAsJsonObject();
 	}
-	
+
 	public static Message get(int id) {
 		String json = Database.getInstance().queryString("SELECT json FROM " + tableName + " WHERE id=" + id);
 		return new Message(json);
 	}
-	
+
 	public String getMessage() {
-		if (message != null) return message;
-		return message = json.getAsJsonPrimitive("message").getAsString();
+		if (message==null) message=json.getAsJsonPrimitive("message").getAsString();
+		return message;
+	}
+
+	public int getId() {
+		if (id==null) id=json.getAsJsonPrimitive("id").getAsInt();
+		return id;
 	}
 }