public class JdbcDao extends JdbcDaoSupport 
{
    @SuppressWarnings("rawtypes")
    public List getTables()
    {
        List result = super.getJdbcTemplate().query(
                "select username, user_id from dba_users where account_status = ?",
                new String[]{"OPEN"}, 
                new ColumnMapRowMapper(){
                    @Override
                    protected String getColumnKey(String columnName) 
                    {   //不同数据库键值始终为小写
                        return super.getColumnKey(columnName).toLowerCase();
                    }
                    
                });
        
        return result;
    }
    
    public static void main(String[] args) 
    {
        /*1、创建DAO*/
        JdbcDao dao = new JdbcDao();
        
        /*2、为DAO设置数据源*/
        DriverManagerDataSource dataSource = new DriverManagerDataSource();
        dataSource.setDriverClassName("oracle.jdbc.driver.OracleDriver");
        dataSource.setUrl("jdbc:oracle:thin:@127.0.0.1:1521:orcl");
        dataSource.setUsername("BMS2044");
        dataSource.setPassword("BMS2044");
        dao.setDataSource(dataSource);
        
        /*3、调用DAO方法*/
        System.out.println(dao.getTables());
    }

}