Android通过使用jtds.jar这个工具访问指定IP地址电脑上的sqlserver2008 数据库

jtds.jar 的下载链接     也可以自行百度。jtds.jar 的文档

CSDN  这编辑器使用不习惯。每一次都不想来CSDN发博客。我都编辑了几次了。

Android 如何访问SqlServer？？？？？下面来解释解释一下   ，

如何访问？

<span style="font-family: Arial, Helvetica, sans-serif; font-size: 12px;"></span>

<span style="font-family: Arial, Helvetica, sans-serif; font-size: 12px;">和一般的Java连接数据库没啥区别。加入jtds 类库，然后写连接方法，下面是通过java 来测试数据的</span>

<pre name="code" class="java"><span style="font-size:18px;">import java.sql.DriverManager;import java.sql.ResultSet;import java.sql.SQLException;import java.sql.Statement;public class DataBaseUtil {private static Connection getSQLConnection(String ip, String user,String pwd, String db) {Connection con = null;try {System.out.println("0");Class.forName("net.sourceforge.jtds.jdbc.Driver");System.out.println("1");con = DriverManager.getConnection("jdbc:jtds:sqlserver://" + ip + ":1433/"+ db + ";charset=utf8; useLOBs=false", user, pwd);System.out.println("value of conn is " + con);} catch (ClassNotFoundException e) {e.printStackTrace();System.out.println("2");} catch (SQLException e) {e.printStackTrace();System.out.println("3");}return con;}public static String testSQL() {String result = "时间  ---------  值-----名字\n";try {Connection conn = getSQLConnection("**.**.**.**", "sa", "123456","test");String sql = "select top 10 * from contents";Statement stmt = conn.createStatement();ResultSet rs = stmt.executeQuery(sql);while (rs.next()) {// <code>ResultSet</code>String s0 = rs.getString("date");String s1 = rs.getString("value");String s2 = rs.getString("name");result += s0 + "-" + s1 + "  -  " + s2 + "\n";System.out.println(s1 + "  -  " + s2);}rs.close();stmt.close();conn.close();} catch (SQLException e) {e.printStackTrace();result += "查询数据异常!" + e.getMessage();}return result;}public static void main(String[] args) {testSQL();}}</span>

在Android中的调用： 

 Android中做耗时的操作，就不能在主线程中执行，访问数据库这种耗时的操作当然得开启新的线程。下面是MainActivity的代码，懒得解释了，直接上代码

package com.example.androidsql;import android.os.Bundle;import android.app.Activity;import android.os.Handler;import android.os.Message;import android.view.View;import android.widget.TextView;public class MainActivity extends Activity {private View btnTest;private View btnClean;private TextView tvTestResult;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);btnTest = findViewById(R.id.btnTestSql);btnClean = findViewById(R.id.btnClean);tvTestResult = (TextView) findViewById(R.id.tvTestResult);btnTest.setOnClickListener(getClickEvent());btnClean.setOnClickListener(getClickEvent());}private View.OnClickListener getClickEvent() {return new View.OnClickListener() {@Overridepublic void onClick(View v) {tvTestResult.setText("...");if (v == btnTest) {test();}}};}/** * 开启新的线程，访问数据库 */private void test() {Runnable run = new Runnable() {@Overridepublic void run() {String ret = DataBaseUtil.testSQL();Message msg = new Message();msg.what = 1001;Bundle data = new Bundle();data.putString("result", ret);msg.setData(data);mHandler.sendMessage(msg);}};new Thread(run).start();}Handler mHandler = new Handler() {public void handleMessage(android.os.Message msg) {switch (msg.what) {case 1001:String str = msg.getData().getString("result");tvTestResult.setText(str); // 获取到了。break;default:break;}};};}

  下面是activity_main.xml的布局

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context=".MainActivity" >    <Button        android:id="@+id/btnTestSql"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="@string/testSQL" />    <Button        android:id="@+id/btnClean"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentRight="true"        android:text="@string/clean" />    <TextView        android:id="@+id/tvTestResult"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_below="@id/btnTestSql"        android:text="@string/hello_world" /></RelativeLayout>

jtds.jar 的下载链接     也可以自行百度。jtds.jar 的文档