Android 使用jtds远程访问数据库

最近老师让我用jtds这个jar包远程访问数据库中的数据，虽然不难，但有几个点还是要注意一下的。

1、jtds的jar包我使用的是1.2.7这个版本的，如果是Java工程使用的是1.3.1这个版本，Android工程不能使用1.3.1否则连接不上数据库

2、远程数据库服务器的防火墙要关闭

下面是如何使用jtds的案例

Javabean有两个字段一个是id，一个是stuName

package com.ht.jdts;

public class StuDomain {
   private String id;
   private String stuName;
   public String getId() {
       return id;
   }
   public void setId(String id) {
       this.id = id;
   }
   public String getStuName() {
       return stuName;
   }
   public void setStuName(String stuName) {
       this.stuName = stuName;
   }
}

访问sqlserver的工具类

package com.example.jdtsproc;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;

public class SqlHelper {
   private String drive = "net.sourceforge.jtds.jdbc.Driver";
   private String connStr;
   private String server;
   private String dbName;
   private String userName;
   private String userPwd;
   private Connection con;
   private PreparedStatement pstm;
   private ResultSet rs;
   private Statement stmt;

   public SqlHelper(String server, String dbName, String userName,
           String userPwd) {
       this.server = server;
       this.dbName = dbName;//数据库名
       this.connStr = "jdbc:jtds:sqlserver://" + this.server + ":1433/"
               + this.dbName;

       this.userName = userName;
       this.userPwd = userPwd;


   }

   public List<StuDomain> ExecuteQuery(String sql) {

       List<StuDomain> stuLists = new ArrayList<StuDomain>();

       try {
           Class.forName(drive);
           System.out.println("驱动加载成功");
           con = DriverManager.getConnection(this.connStr, this.userName,
                   this.userPwd);
           System.out.println("数据库连接成功");
           //pstm = con.prepareStatement(sql);

           stmt = con.createStatement();

           rs = stmt.executeQuery(sql);

           while (rs.next()) {

               StuDomain stuDomain=new StuDomain();
               stuDomain.setId(rs.getString(1));
               stuDomain.setStuName(rs.getString(2));

               stuLists.add(stuDomain);

           }
           System.out.println("stuLists.size():"+stuLists.size());

       } catch (Exception e) {
           System.out.println("数据库连接异常");
           e.printStackTrace();
           return null;
       } finally {
           try {
               if(rs!=null){
                   rs.close();
               }
               if(stmt!=null){
                   stmt.close();
               }
               if(con!=null){
                   con.close();
               }

           } catch (SQLException e) {
               // TODO Auto-generated catch block
               e.printStackTrace();
           }
       }
       return stuLists;
   }

}

MainActivity 并将数据显示在ListView上

package com.example.jdtsproc;

import java.util.List;

import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.os.Handler;

import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;

public class MainActivity extends ActionBarActivity {

    private Button btn_connect;
   private ListView lv_lists;

   private List<StuDomain> stuLists;

   private SqlHelper sh=new SqlHelper("xxx.xx.xxx.xx", "MyDb1", "sa", "sa");//第一个参数是访问的远程数据库服务器的ip
   private Handler mHandler=new Handler(){
       public void handleMessage(android.os.Message msg) {
           lv_lists.setAdapter(new StuAdapter());
       };
   };
   @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        initView();

        initData();

    }

   private void initData() {
       btn_connect.setOnClickListener(new OnClickListener() {

           @Override
           public void onClick(View v) {
               new Thread(){



                   public void run() {
                       String sql="select *from stu";
                       stuLists = sh.ExecuteQuery(sql);

                       mHandler.sendEmptyMessage(0);//发送消息
                       //lv_lists.setAdapter(new StuAdapter());
                   };
               }.start();
           }
       });
   }

   private void initView() {
       //找到我们所需要的
       btn_connect = (Button) findViewById(R.id.btn_connect);
       lv_lists = (ListView) findViewById(R.id.lv_lists);
   }

   class StuAdapter extends BaseAdapter{

       @Override
       public int getCount() {

           return stuLists.size();
       }

       @Override
       public StuDomain getItem(int position) {

           return stuLists.get(position);
       }

       @Override
       public long getItemId(int position) {

           return position;
       }

       @Override
       public View getView(int position, View convertView, ViewGroup parent) {
           StuViewHolder stuHolder;
           if(convertView==null){
               convertView=View.inflate(getApplicationContext(), R.layout.list_main, null);
               stuHolder=new StuViewHolder();
               stuHolder.tv_id=(TextView) convertView.findViewById(R.id.tv_id);
               stuHolder.tv_stuname=(TextView) convertView.findViewById(R.id.tv_stuname);
               stuHolder.iv_photos=(ImageView) convertView.findViewById(R.id.iv_photos);
           }else{
               stuHolder=(StuViewHolder) convertView.getTag();
           }
           stuHolder.tv_id.setText(getItem(position).getId());
           stuHolder.tv_stuname.setText(getItem(position).getStuName());
           stuHolder.iv_photos.setImageResource(R.drawable.photopager);
           return convertView;
       }

   }

   class StuViewHolder{
       public TextView tv_id;
       public TextView tv_stuname;
       public ImageView iv_photos;
   }

}