SQLite 初步测试

package org.prothro;

import android.app.Activity;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class SQLiteTestActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
         final SQLiteDatabase db = SQLiteDatabase.openOrCreateDatabase(this.getFilesDir().toString() + "/db.db3", null);
         
         Button btn = (Button)findViewById(R.id.button1);
         btn.setOnClickListener(new OnClickListener() {
            final    EditText username = (EditText)findViewById(R.id.username);
            final    EditText password = (EditText)findViewById(R.id.password);
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub

                
                try{
                    
                    db.execSQL("insert into user values('"+username.getText().toString()+"','"+password.getText().toString()+"')");
                    
                }catch(SQLException e){
                    e.printStackTrace();
                    db.execSQL(
                            "create table user(username varchar(20),password varchar(20));"
                            );
                    db.execSQL("insert into user values('"+username+"','"+password+"')");
                }
                
                //取出数据库中所有的数据
                Cursor cursor = db.rawQuery("select * from user", null);
                
                while(cursor.moveToNext()){
                    
                    Toast.makeText(
                            SQLiteTestActivity.this, 
                            cursor.getString(cursor.getColumnIndex("username"))+"   "+cursor.getString(cursor.getColumnIndex("password")), 
                            1000).show();
                }
                
            }
        });
    }
}