Execute sql in java

I have the following code:

<bean id="hibernateTemplate" class="org.springframework.orm.hibernate4.HibernateTemplate">
    <property name="sessionFactory" ref="sessionFactory" />
</bean>

My class:

public class DataBaseServiceImpl implements IDataBaseService {

  @Autowired
  private IDataBaseDao databaseDao;

  @Override
  @Transactional(readOnly = true)
  public List<Jdbc> findAll() {
    return databaseDao.findAll();
  }

and my other class

@Repository
public class DataBaseDao implements IDataBaseDao {

@Autowired
private HibernateTemplate hibernateTemplate;

@SuppressWarnings("unchecked")
@Override
public List<Jdbc> findAll() {
    return (List<Jdbc>) hibernateTemplate.find("from Jdbc");
}

This works without problems, but I want to execute a sql, now I have this:

@Override
public List<Column> getColumns(Jdbc jdbc, String tableName) throws SQLException {
    List<Column> result = new ArrayList<Column>();
    Connection connection = null;
    Statement stmt = null;
    ResultSet rs = null;
    String query = null;

    try {
        connection = getConnection(jdbc);
        stmt = connection.createStatement();

            query = "Select column_name AS field,data_type as type from user_tab_columns where table_name= '" + tableName + "'";

        rs = stmt.executeQuery(query);

        while (rs.next()) {
            result.add(new Column(rs.getString("field"), rs.getString("type")));
        }

    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        closeConnection(rs, stmt, connection);
    }

    return result;
}

How can I also execute this query without opening a connection because I already injected it into the class DataBaseServiceImpl .