Look up a value in Java

gistfile1.java

    public String retrieveCacheValue(String entityKey, String cacheKey) {
        Connection connection = null;
        PreparedStatement preparedStatement = null;
        try {

            connection = dataSource.getConnection();
            preparedStatement = SqlHelper.prepareTableSelectStatement(connection,
                    TABLE_NAME,
                    new String[]{COL_CACHE_NAME, COL_ENTITY_KEY, COL_CACHE_KEY},
                    new String[]{mCacheName, entityKey, cacheKey});
            ResultSet resultSet = preparedStatement.executeQuery();

            if (resultSet.next()) {
                return resultSet.getString(resultSet.findColumn(COL_VALUE));
            } else {
                return null;
            }
        } catch (SQLException e) {
            throw new RuntimeException(e);
        } finally {
            if (connection != null) {
                try {
                    connection.close();
                } catch (SQLException e) {
                    log.debug("Exception closing connection ", e);
                }
            }
            if (preparedStatement != null) {
                try {
                    preparedStatement.close();
                } catch (SQLException e) {
                    log.debug("Exception closing prepared statement ", e);
                }
            }
        }
    }