public class DataReader {
	

	private Connection connection;
	private String dbFileName;
	private boolean isOpened = false;

	private final static String QUERY_SELECT_BY_NAME = "SELECT * FROM media WHERE FilePath=?;";
	private final static String QUERY_SELECT_BY_NAME_HASHCODE = "SELECT * FROM media WHERE FilePath=? AND CheckSum=?;";
	private final static String QUERY_SELECT_THUMBNAIL = "SELECT Thumbnail FROM media WHERE FilePath=?;";

	public final static String DATABASE = "crystalcube.db";
	
	static {
		try {
			Class.forName("org.sqlite.JDBC");
		} catch(Exception e) { e.printStackTrace(); }
	}

	public DataReader(String databaseFileName) {
		this.dbFileName = databaseFileName;
	}
}

	public boolean open() {
		try {
			// 읽기 전용
			SQLiteConfig config = new SQLiteConfig();
			config.setReadOnly(true);
			this.connection = DriverManager.getConnection("jdbc:sqlite:/" + this.dbFileName, config.toProperties());
		} catch(SQLException e) { e.printStackTrace(); return false; }

		isOpened = true;
		return true;
	}


	public boolean close() {
		if(this.isOpened == false) { return true; }

		try {
			this.connection.close();
		} catch(SQLException e) { e.printStackTrace(); return false; }
		return true;
	}

	public boolean readMeta(String filePath, String hashCode, PCloudItem item) throws SQLException {
		if(this.isOpened == false) { return false; }

		boolean result = false;
		String query = "SELECT * FROM media WHERE FilePath=? AND CheckSum=?;";
		PreparedStatement prep = 
			this.connection.prepareStatement(query);
		prep.setString(1, filePath);
		prep.setString(2, hashCode);

		ResultSet row = prep.executeQuery();
		if(row.next()) {
			row.getString(1);			// index 로 가져오기
			row.getString("FileSize");	// field 이름으로 가져오기
			
			result = true;
		}
		row.close();
		prep.close();
		return result;
	}