本文主要是介绍GreenDao 基本使用，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
近期调研数据库框架，结合调研锁得出的结论，个人还是觉得GreenDao 比较好用，因此我就大致写一下此框架的基本用法，加深一下自己对这个框架的印象
第一步：在app的Build.gradle中添加如下配置：
apply plugin: 'org.greenrobot.greendao'
在android中添加
greendao {schemaVersion 1//数据库版本号daoPackage 'com.com.sky.downloader.greendao'//设置DaoMaster、DaoSession、Dao包名targetGenDir 'src/main/java'//设置DaoMaster、DaoSession、Dao目录}
在build.gradle(project "")中加入
classpath 'org.greenrobot:greendao-gradle-plugin:3.2.1'
最后加入依赖
implementation 'org.greenrobot:greendao:3.2.0'
第二步：写实体类
public class User {private Long id;private String name;private int age;
}
点击Build后make project后GreenDao会自动帮你生成get/set方法如下:
public class User {@Id(autoincrement = true)private Long id;private String name;private int age;@Generated(hash = 1309193360)public User(Long id, String name, int age) {this.id = id;this.name = name;this.age = age;}@Generated(hash = 586692638)public User() {}public Long getId() {return this.id;}public void setId(Long id) {this.id = id;}public String getName() {return this.name;}public void setName(String name) {this.name = name;}public int getAge() {return this.age;}public void setAge(int age) {this.age = age;}}
封装GreenDaoManager
public class GreenDaoManager {private DaoMaster mDaoMaster;private DaoSession mDaoSession;private static GreenDaoManager mInstance; //单例private GreenDaoManager(){if (mInstance == null) {DaoMaster.DevOpenHelper devOpenHelper = newDaoMaster.DevOpenHelper(MyApplication.getContext(), "user1-db", null);//此处为自己需要处理的表mDaoMaster = new DaoMaster(devOpenHelper.getWritableDatabase());mDaoSession = mDaoMaster.newSession();}}public static GreenDaoManager getInstance() {if (mInstance == null) {synchronized (GreenDaoManager.class) {//保证异步处理安全操作if (mInstance == null) {mInstance = new GreenDaoManager();}}}return mInstance;}public DaoMaster getMaster() {return mDaoMaster;}public DaoSession getSession() {return mDaoSession;}public DaoSession getNewSession() {mDaoSession = mDaoMaster.newSession();return mDaoSession;}
}
在Application中配置好：
public class MyApplication extends Application {private static Context mContext;@Overridepublic void onCreate() {super.onCreate();mContext = getApplicationContext();//greenDao全局配置,只希望有一个数据库操作对象GreenDaoManager.getInstance();}public static Context getContext() {return mContext;}
}
这就配置好了，然后就可以使用了。
下面就是基本的使用啦
private void insertdata() {//插入数据User insertData = new User(null, "插入数据", 22, false);getUserDao().insert(insertData);
}private void updatadata() {//更改数据List<User> userss = getUserDao().loadAll();User user = new User(userss.get(0).getId(), "更改后的数据用户", 22, true);getUserDao().update(user);}private void querydata() {//查询数据详细List<User> users = getUserDao().loadAll();Log.i("tag", "当前数量：" + users.size());for (int i = 0; i < users.size(); i++) {}}
public void deleteAllNote(){getUserDao().deleteAll();
}
其他方法就留个各位自己研究啦，小弟先行告退。
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