最近老師讓我用jtds這個jar包遠程訪問數據庫中的數據，雖然不難，但有幾個點還是要註意一下的。

1、jtds的jar包我使用的是1.2.7這個版本的，如果是Java工程使用的是1.3.1這個版本，Android工程不能使用1.3.1否則連接不上數據庫

2、遠程數據庫服務器的防火墻要關閉

下面是如何使用jtds的案例

Javabean有兩個字段一個是id，一個是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;
}
}

訪問sqlserver的工具類

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;//數據庫名
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("驅動加載成功");
con = DriverManager.getConnection(this.connStr, this.userName,
this.userPwd);
System.out.println("數據庫連接成功");
//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("數據庫連接異常");
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 並將數據顯示在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");//第一個參數是訪問的遠程數據庫服務器的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);//發送消息
//lv_lists.setAdapter(new StuAdapter());
};
}.start();
}
});
}

private void initView() {
//找到我們所需要的
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;
}

}

最後奉獻jtds的兩個jar包 永久鏈接：https://pan.baidu.com/s/1YBW1I_ddSKe7vcIouDXKrg 密碼：0v95

Android 使用jtds遠程訪問數據庫