GreenDao数据库的使用方法

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 {@Idprivate 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()4000;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;}}