可以使用此代码连接到SQL Server 2008吗？

Question

I'm trying to connect to a Microsoft SQL 2008 server, this seems to work for others, but I'm having no luck. I know it isn't the best practice to directly connect to the server, but this app is only for demonstration and won't be distributed beyond my device.

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;

import net.sourceforge.jtds.jdbc.*;

public void query2()
{
    Log.i("Android"," MySQL Connect Example.");
    Connection conn = null;
    try {
        String driver = "net.sourceforge.jtds.jdbc.Driver";
        Class.forName(driver).newInstance();
        //test = com.microsoft.sqlserver.jdbc.SQLServerDriver.class;
        String connString = "jdbc:jtds:sqlserver://server_ip_address               
        :1433/DBNAME;encrypt=fasle;user=xxxxxxxxx;password=xxxxxxxx;instance=SQLEXPRESS;";
        String username = "xxxxxx";
        String password = "xxxxxxxxxx";
        conn = DriverManager.getConnection(connString,username,password);
        Log.w("Connection","open");
        Statement stmt = conn.createStatement();
        ResultSet reset = stmt.executeQuery("select * from TableName");

        //Print the data to the console
        while(reset.next()){
            Log.w("Data:",reset.getString(3));
            // Log.w("Data",reset.getString(2));
        }
        conn.close();
    } 
    catch (Exception e)
    {
        Log.w("Error connection","" + e.getMessage());
    }
}

If not, what needs to be changed? It crashes on the connection statement each time. Thank You.

Edit: Here is the logcat for the event.

12-12 06:11:41.273: E/AndroidRuntime(5745): FATAL EXCEPTION: main 12-12 06:11:41.273: E/AndroidRuntime(5745): java.lang.IllegalStateException: Could not execute method of the activity 12-12 06:11:41.273: E/AndroidRuntime(5745): at android.view.View$1.onClick(View.java:3597) 12-12 06:11:41.273: E/AndroidRuntime(5745): at android.view.View.performClick(View.java:4202) 12-12 06:11:41.273: E/AndroidRuntime(5745): at android.view.View$PerformClick.run(View.java:17340) 12-12 06:11:41.273: E/AndroidRuntime(5745): at android.os.Handler.handleCallback(Handler.java:725) 12-12 06:11:41.273: E/AndroidRuntime(5745): at android.os.Handler.dispatchMessage(Handler.java:92) 12-12 06:11:41.273: E/AndroidRuntime(5745): at android.os.Looper.loop(Looper.java:137) 12-12 06:11:41.273: E/AndroidRuntime(5745): at android.app.ActivityThread.main(ActivityThread.java:5039) 12-12 06:11:41.273: E/AndroidRuntime(5745): at java.lang.reflect.Method.invokeNative(Native Method) 12-12 06:11:41.273: E/AndroidRuntime(5745) : at java.lang.reflect.Method.invoke(Method.java:511) 12-12 06:11:41.273: E/AndroidRuntime(5745): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 12-12 06:11:41.273: E/AndroidRuntime(5745): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 12-12 06:11:41.273: E/AndroidRuntime(5745): at dalvik.system.NativeStart.main(Native Method) 12-12 06:11:41.273: E/AndroidRuntime(5745): Caused by: java.lang.reflect.InvocationTargetException 12-12 06:11:41.273: E/AndroidRuntime(5745): at java.lang.reflect.Method.invokeNative(Native Method) 12-12 06:11:41.273: E/AndroidRuntime(5745): at java.lang.reflect.Method.invoke(Method.java:511) 12-12 06:11:41.273: E/AndroidRuntime(5745): at android.view.View$1.onClick(View.java:3592) 12-12 06:11:41.273: E/AndroidRuntime(5745): ... 11 more 12-12 06:11:41.273: E/AndroidRuntime(5745): Caused by: java.sql.SQLException: No suitable driver 12-12 06:11:41.273: E/AndroidRuntime(5745): at java.sql.DriverManager.getConnec tion(DriverManager.java:182) 12-12 06:11:41.273: E/AndroidRuntime(5745): at java.sql.DriverManager.getConnection(DriverManager.java:140) 12-12 06:11:41.273: E/AndroidRuntime(5745): at com.nateapp.finalproject.MainActivity.sendData(MainActivity.java:266) 12-12 06:11:41.273: E/AndroidRuntime(5745): ... 14 more

All it needs to be able to do is an insert statement.

Answer 1

What does "crashes" look like? Post the stack trace.

This code is wrong on every level. You shouldn't be creating connections that way in a method that interacts with a database. It's better to create it elsewhere (eg get it from a pool) and pass it into the method.

You don't close ResultSet or Statement . Closing the Connection won't clean those up. You should close them in a finally block.

This is the reason for your problem:

12-12 06:11:41.273: E/AndroidRuntime(5745): Caused by: java.sql.SQLException: No suitable driver

"No suitable driver" usually means that the connection URL is borked. Check that.