1. 简介
屏幕快照 2018-04-14 10.36.40.png
2. 使用方式
- 1 在Project的buil.gradle里面添加配置项
buildscript {
repositories {
jcenter()
mavenCentral()
}
dependencies {
classpath 'com.android.tools.build:gradle:2.1.0'
classpath 'org.greenrobot:greendao-gradle-plugin:3.1.0'
}
}
2.2 在Module里面的dependencies里面添加
apply plugin: 'org.greenrobot.greendao'
...
greendao{
schemaVersion 1
targetGenDir 'src/main/java/'
}
compile'org.greenrobot:greendao:3.1.0'
compile'org.greenrobot:greendao-generator:3.1.0'
2.3 新建User.java
@Entity
public class User {
@Id
private Long id;
@Property(nameInDb = "USERNAME")
private String username;
@Property(nameInDb = "NICKNAME")
private String nickname;
}
2.4 在Application类之中添加DaoSession对象
private DaoSession daoSession;
@Override
public void onCreate() {
super.onCreate();
DaoMaster.DevOpenHelper helper = new
DaoMaster.DevOpenHelper(this,"test.db",null);
Database db = helper.getWritableDb();
daoSession = new DaoMaster(db).newSession();
}
public DaoSession getDaoSession() {
return daoSession;
}
2.5 数据库的CURD操作
private DaoSession daoSessin;
private UserDao dao;
daoSessin = ((MyApplication) getApplication()).getDaoSession();
dao = daoSessin.getUserDao();
// 增加
private void add() {
User addUser = new User();
addUser.setUsername("xiaoming");
addUser.setNickname("angle");
dao.insert(addUser);
Toast.makeText(this,"add success.",Toast.LENGTH_SHORT).show();
}
//删除
private void delete() {
List<User> deleteList = dao.queryBuilder().where(
UserDao.Properties
.Username.eq("xiaoming"))
.build().list();
for (User u : deleteList) {
dao.delete(u);
}
Toast.makeText(this,"delete success.",Toast.LENGTH_SHORT).show();
}
//修改
private void modify() {
List<User> updateList = dao.queryBuilder().where(UserDao.Properties.Username
.eq("xiaoming"))
.build().list();
for (User u : updateList) {
u.setNickname("updated angle");
dao.update(u);
}
Toast.makeText(this,"modify success.",Toast.LENGTH_SHORT).show();
}
//查找
private void select() {
Query<User> userQuery = dao.queryBuilder()
.orderAsc(UserDao.Properties.Id)
.build();
List<User> users = userQuery.list();
String res = "";
for (User u : users) {
res += u.toString();
res += "\r\n";
}
message.setText(res);
}
