Getting error with code............

DB.java

//=======================================================================================
public class GameDB {

	private static String _DB_NAME	=	"GAME_FRAMEWORK.db";
	private static int _DB_VERSION	=1;
	
	private Context _context;
	private DBHelper	_helper;
	
	//=====================================================
	public GameDB(Context context){
		
		this._context	=	context;
		this._helper	=	new DBHelper(this._context, this._DB_NAME, null, this._DB_VERSION);
		this._helper	=	new DBHelper(this._context);
		SQLiteDatabase sqdb	=	this._helper.getWritableDatabase();
		sqdb.close();
	}
	
	//=====================================================
	/**This will save the user game, loss, of a particular game across a session, if record already exists for
	 * same session and same game, it will be updated( wins and losses added after the present ones ) */
	public void saveGameRecord(String session_id, GAME game,int win, int loss){
		
		try{
			
			if(recordExistsForThisSessionAndGame(session_id, game))
				updateUserRecordForThisSession(session_id, game, win, loss);
			else
				insertUserGameRecord(session_id, game, win, loss);
			
		}catch(Exception e){e.printStackTrace();}
	}
	
	//=====================================================
	private boolean recordExistsForThisSessionAndGame(String session_id, GAME game){
		
		try{
			
			SQLiteDatabase sqdb;
			sqdb	=	this._context.openOrCreateDatabase(this._DB_NAME, this._context.MODE_PRIVATE, null);
			
			String query= " select * from  "+TABLE.GAME_RECORD+"  where "+GAME_RECORD.SESSION_ID+"="+session_id+" and "+GAME_RECORD.GAME_ID+"="+game+"  ";
			
			Cursor c=sqdb.rawQuery(query, null);
			int count=0;
			
			if(!c.moveToFirst())
				while(!c.isAfterLast())
					count=1;
			
			c.close();	sqdb.close();
			
			if(count>0)	return true;
			
		}catch(Exception e){e.printStackTrace();}
		
		return false;
	}
	
	//=====================================================
	private void updateUserRecordForThisSession(String session_id, GAME game, int win, int loss){
		
		try{
			
			SQLiteDatabase sqdb= this._context.openOrCreateDatabase(this._DB_NAME, this._context.MODE_PRIVATE, null);
			
			String query;
			
			query	=	" update "+TABLE.GAME_RECORD+" set "+GAME_RECORD.LOSS+" = ("+GAME_RECORD.LOSS+"+"+loss+"), "+GAME_RECORD.WIN+" = ("+GAME_RECORD.WIN+"+"+win+") where  "+GAME_RECORD.SESSION_ID+" = "+session_id+" and "+GAME_RECORD.GAME_ID+" = "+game+" ; ";
			
			sqdb.execSQL(query);
			
			sqdb.close();
			
		}catch(Exception e){e.printStackTrace();}
	}
	
	//=====================================================
	private void insertUserGameRecord(String session_id, GAME game, int win, int loss){
		
		try{
			
			SQLiteDatabase sqdb= this._context.openOrCreateDatabase(this._DB_NAME, this._context.MODE_PRIVATE, null);
			String query	=	" insert into "+TABLE.GAME_RECORD+" ("+GAME_RECORD.SESSION_ID+", "+GAME_RECORD.GAME_ID+", "+GAME_RECORD.WIN+", "+GAME_RECORD.LOSS+") values ("+session_id+", "+game+", "+win+", "+loss+") ";
			
			sqdb.execSQL(query);
			
			sqdb.close();
			
		}catch(Exception e){e.printStackTrace();}
	}
	
	
	
	
	
	
	private static class DBHelper extends SQLiteOpenHelper{

		//===================================================
		public DBHelper(Context context){
			
			super(context, GameDB._DB_NAME, null, GameDB._DB_VERSION);
			Log.i("message","inside helper constructor");
		}
		
		//===================================================
		public DBHelper(Context context, String name, CursorFactory factory,int version) {
			
			super(context, name, factory, version);
		}

		//===================================================
		@Override
		public void onCreate(SQLiteDatabase db) {
			
			Log.i("message","inside oncreate");
			//createTables(db);
		}

		//====================================================
		@Override
		public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
			
		}
		
		//====================================================
		/**This creates following tables:<br>
		 * <ul>
		 * 	<li>
		 * 		Game Record	:	fields (record_id, session_id, game_id, win, loss)
		 * 	</li>
		 *</ul> */
		private void createTables(SQLiteDatabase db){
			
			try{
				
				String query;
				
				query	=	"Create table if not exists "+TABLE.GAME_RECORD+" ("+GAME_RECORD.RECORD_ID+" INTEGER PRIMARY KEY AUTOINCREMENT, "+GAME_RECORD.GAME_ID+" varchar(50),  "+GAME_RECORD.WIN+" int(15), "+GAME_RECORD.LOSS+" int(15)) ";
				db.execSQL(query);
				
			}catch(Exception e){e.printStackTrace();}
		}
	}




	//=======================================================================================
	class TABLE{
		
		public static final String GAME_RECORD	=	"game_record";
	}


	//=======================================================================================
	class GAME_RECORD{
		
		public static final String RECORD_ID	=	"RECORD_ID";
		public static final String GAME_ID		=	"GAME_ID";
		public static final String SESSION_ID	=	"SESSION_ID";
		public static final String WIN			=	"WIN";
		public static final String LOSS			=	"LOSS";
	}
	
}