SQLite テーブルの存在確認

private boolean isTableExists() {
	boolean ret = false;
	String kakunin_sql = "select count(*) from sqlite_master where type='table' and name= '"
			+ DbConnection.DBTABLE + "';";
	Log.v("DbConnection", "kakunin_sql=" + kakunin_sql);
	db = dbHelper.getReadableDatabase();
	Cursor c = db.rawQuery(kakunin_sql, null);
	c.moveToFirst();
	Log.v("DbConnection", "テーブル存在確認結果：" + c.getInt(0));
	if (c.getInt(0) == 1) {
		// テーブルが存在する
		ret = true;
	}
	c.close();
	return ret;
}