GreenDao数据库的使用方法

Project gradle依赖

buildscript {    repositories {        jcenter()        mavenCentral()    }    dependencies {        classpath 'com.android.tools.build:gradle:2.3.1'        classpath 'com.neenbedankt.gradle.plugins:android-apt:1.8'        classpath 'org.greenrobot:greendao-gradle-plugin:3.2.2'

Module gradle依赖

apply plugin: 'org.greenrobot.greendao'
compile 'org.greenrobot:greendao:3.2.2'
greendao {    schemaVersion 1    daoPackage 'com.example.zhang20171130.gen'   //改成当前工程的包名.gen    targetGenDir 'src/main/java' }
在Bean类中加入注解
@Entitypublic class Person {    @Id    private Long id;
Build--Make Module 编译一下
DbHelper
public class DbHelper {    private static volatile DbHelper instance;    private final DaoSession daoSession;    private final DaoMaster daoMaster;    public DbHelper(Context context) {        //初始化数据库的一些配置        DaoMaster.DevOpenHelper helper=new DaoMaster.DevOpenHelper(context,"user",null);        //获取数据库的操作对象        SQLiteDatabase database = helper.getWritableDatabase();        //获取DaoMaster对象        daoMaster = new DaoMaster(database);        //获取DaoSession对象        daoSession =daoMaster.newSession();    }    public static DbHelper getInstance(Context context){        if(instance == null){            synchronized (DbHelper.class){                if(null==instance){                    instance=new DbHelper(context);                }            }        }        return instance;    }    public PersonDao getPerson(){        return daoSession.getPersonDao();    }}
增删改查的方法
@OnClick({R.id.zeng, R.id.shan, R.id.gai, R.id.cha})public void onViewClicked(View view) {    switch (view.getId()) {        case R.id.zeng:            Person p=new Person();            p.setId(Long.parseLong(ed1.getText().toString()));            p.setName(ed2.getText().toString());            dao.insert(p);            break;        case R.id.shan:            Person p1=new Person();            p1.setId(Long.parseLong(ed1.getText().toString()));            p1.setName(ed2.getText().toString());            dao.delete(p1);            break;        case R.id.gai:            Person p2=new Person(Long.parseLong(ed1.getText().toString()),ed2.getText().toString());            dao.update(p2);            break;        case R.id.cha:            persons = dao.loadAll();            adapter = new Adapter(this,persons);            lv.setAdapter(adapter);            adapter.notifyDataSetChanged();            break;    }}