Ajax实现省市区三级级联(数据来自mysql数据库)

AddressDao.java

package cn.bestchance.dao;

import java.util.ArrayList;

import cn.bestchance.entity.Address;

public interface AddressDao {
 /**
  * 获取省的id和名称
  * @return
  */
 ArrayList<Address> getProvince();
 /**
  * 根据省的id获取市的信息
  * @param provinceId
  * @return
  */
 ArrayList<Address> getCityByProvinceId(int provinceId);
 /**
  * 根据市的id获取区的信息
  * @param cityId
  * @return
  */
 ArrayList<Address> getAreaByCityId(int cityId);
}

AddressDaoImpl.java

package cn.bestchance.dao.impl;

import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;

import cn.bestchance.dao.AddressDao;
import cn.bestchance.entity.Address;
import cn.bestchance.util.DBUtil;

public class AddressDaoImpl implements AddressDao {
 private DBUtil db = new DBUtil();
 @Override
 public ArrayList<Address> getProvince() {
  ArrayList<Address> addrList = new ArrayList<Address>();
  db.openConnection();
  String sql = "select * from province";
  ResultSet rs = db.excuteQuery(sql);
  try {
   while(rs.next()){
    Address addr = new Address();
    addr.setId(rs.getInt(2));
    addr.setAddress(rs.getString(3));
    addrList.add(addr);
   }
  } catch (SQLException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }finally{
   if(rs != null){
    try {
     rs.close();
    } catch (SQLException e) {
     // TODO Auto-generated catch block
     e.printStackTrace();
    }
   }
   db.closeResoure();
  }
  return addrList;
 }
 @Override
 public ArrayList<Address> getCityByProvinceId(int provinceId) {
  ArrayList<Address> addrList = new ArrayList<Address>();
  db.openConnection();
  String sql = "select * from city where fatherID = " + provinceId; //431200
  ResultSet rs = db.excuteQuery(sql);
  try {
   while(rs.next()){
    Address addr = new Address();
    addr.setId(rs.getInt(2));
    addr.setAddress(rs.getString(3));
    addrList.add(addr);
   }
  } catch (SQLException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }finally{
   if(rs != null){
    try {
     rs.close();
    } catch (SQLException e) {
     // TODO Auto-generated catch block
     e.printStackTrace();
    }
   }
   db.closeResoure();
  }
  return addrList;
 }
 @Override
 public ArrayList<Address> getAreaByCityId(int cityId) {
  ArrayList<Address> addrList = new ArrayList<Address>();
  db.openConnection();
  String sql = "select * from area where fatherID = " + cityId; //431200
  ResultSet rs = db.excuteQuery(sql);
  try {
   while(rs.next()){
    Address addr = new Address();
    addr.setId(rs.getInt(2));
    addr.setAddress(rs.getString(3));
    addrList.add(addr);
   }
  } catch (SQLException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }finally{
   if(rs != null){
    try {
     rs.close();
    } catch (SQLException e) {
     // TODO Auto-generated catch block
     e.printStackTrace();
    }
   }
   db.closeResoure();
  }
  return addrList;
 }

}

								 
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