使用android访问SQLServer数据库

Posted 2021-11-27 myzjs

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> 

string.xml 

 

 

<?xml version="1.0" encoding="utf-8"?>  
<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" />