hibernate 查询问题

就是我有一张表
在eclipse中加入了hibernate 想通过hibernate 查询出 数据
我在本地运行的sql 是select province,city from code where province = '湖南省' group by city;
能够查询出 

Code.java

package com.test.hibernate;



import javax.persistence.Entity;

import javax.persistence.Id;





@Entity

public class Code {

	

	private int id;

	private String province;

	private String city;

	private String county;

	private int postcode;

	

	@Id

	public int getId() {

		return id;

	}

	public void setId(int id) {

		this.id = id;

	}

	public String getProvince() {

		return province;

	}

	public void setProvince(String province) {

		this.province = province;

	}

	public String getCity() {

		return city;

	}

	public void setCity(String city) {

		this.city = city;

	}

	public String getCounty() {

		return county;

	}

	public void setCounty(String county) {

		this.county = county;

	}

	public int getPostcode() {

		return postcode;

	}

	public void setPostcode(int postcode) {

		this.postcode = postcode;

	}

	

}

hibernate.cfg.xml

<?xml version='1.0' encoding='utf-8'?>

<!DOCTYPE hibernate-configuration PUBLIC

        "-//Hibernate/Hibernate Configuration DTD 3.0//EN"

        "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">



<hibernate-configuration>



    <session-factory>



        <!-- Database connection settings -->

        <property name="connection.driver_class">com.mysql.jdbc.Driver</property>

        <property name="connection.url">jdbc:mysql://localhost/code</property>

        <property name="connection.username">root</property>

        <property name="connection.password">root</property>



        <!-- JDBC connection pool (use the built-in) -->

        <property name="connection.pool_size">1</property>



        <!-- SQL dialect -->

        <property name="dialect">org.hibernate.dialect.MySQLDialect</property>



        <!-- Enable Hibernate's automatic session context management -->

        <property name="current_session_context_class">thread</property>



        <!-- Disable the second-level cache&n