1.SQL驱动
下载可以支持Android的SQL驱动,下载地址http://sourceforge.net/projects/jtds/files/ 注意只能下载1.2.7版本。android不支持用高版本的。
将jtds-1.2.7.jar放在android项目libs目录下。
2.开发环境
windows 7 X64
android 4.2
android studio 2.2
3.代码
数据库连接类DBUtil.Java
package com.example.androidsql;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
public class DBUtil
{
private static Connection getSQLConnection(String ip, String user, String pwd, String db)
{
Connection con = null;
try
{
Class.forName("net.sourceforge.jtds.jdbc.Driver");
con = DriverManager.getConnection("jdbc:jtds:sqlserver://" + ip + ":1433/" + db + ";charset=utf8", user, pwd);
} catch (ClassNotFoundException e)
{
e.printStackTrace();
} catch (SQLException e)
{
e.printStackTrace();
}
return con;
}
public static String QuerySQL()
{
String result = "";
try
{
Connection conn = getSQLConnection("xx.xx.xx.xx", "sa", "123", "DataBaseName");
String sql = "select top 10 * from Users";
Statement stmt = conn.createStatement();//
ResultSet rs = stmt.executeQuery(sql);
while (rs.next())
{
String s1 = rs.getString("UserName");
String s2 = rs.getString("Password");
result += 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)
{
QuerySQL();
}
}
MainActivity.java:
package com.example.androidsql;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.widget.TextView;
public class MainActivity extends Activity
{
private View btnTest;
private View btnClean;
private TextView tvTestResult;
@Override
protected 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()
{
@Override
public void onClick(View v)
{
tvTestResult.setText("...");
if(v==btnTest){
test();
}
}
};
}
private void test()
{
Runnable run = new Runnable()
{
@Override
public void run()
{
String ret = DBUtil.QuerySQL();
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);
break;
default:
break;
}
};
};
}
activity_main.xml:
<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>
strings.xml
<resources>
<string name="app_name">AndroidSQL</string>
<string name="action_settings">Settings</string>
<string name="hello_world">Hello world!</string>
<string name="testSQL">测试SQL</string>
<string name="clean">清除数据</string>
</resources>
最后如果出现连接数据错误信息 空指针错误,则需要在AndroidManifest.xml中加入:
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
以上便是博客的内容。我这里要再次说明一下,使用上面的代码在Android studio的模拟器中运行时,读取到的数据库中的中文为乱码。我把DBUtil.java文件中的一句代码做了修改,修改如下:
con = DriverManager.getConnection("jdbc:jtds:sqlserver://" + ip + ":1433/" + db , user, pwd);
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