Dbutils数据库增删改查

package com.example.day5_xutildemo;

import java.util.ArrayList;
import java.util.List;

import com.baidu.vo.Car;
import com.lidroid.xutils.DbUtils;
import com.lidroid.xutils.db.sqlite.Selector;
import com.lidroid.xutils.exception.DbException;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        //通过xutils里的DButils类创建数据库
        DbUtils db = DbUtils.create(this, "dbutils.db");
        try {
            db.createTableIfNotExist(Car.class);//创建小车表
            
            Car c1 = new Car("奔驰", 3.0f, "red");
            db.save(c1);//保存对象
            Car c2 = new Car("宝马", 3.0f, "red");
            db.save(c2);//保存对象
            
            Car c = new Car(1,"奔驰", 10.0f, "red");
            db.update(c, null);//db.update(c, new String[]{"price"});只修改价钱字段
            
            db.delete(c);
            
//            ArrayList<Car> cars = (ArrayList<Car>) db.findAll(Car.class);//全查
            List<Car> cars = db.findAll(Selector.from(Car.class).where("id", "<", 4));//过滤查询
            System.out.println(cars);
            
        } catch (DbException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        
    }