GreenDao配置使用

第一步

//学习地址
https://blog.csdn.net/qq_38520096/article/details/78833801

//网站可看
https://github.com/greenrobot/greenDAO

2 . 第二步CV大法

classpath 'org.greenrobot:greendao-gradle-plugin:3.2.2' // add plugin

   mavenCentral() // add repository

implementation 'org.greenrobot:greendao:3.2.2' // add library

apply plugin: 'org.greenrobot.greendao' // apply plugin

在这里插入图片描述

//工具类
//单例数据库
public class SqlliteUtils {

    private DaoMaster mdaoMaster;
    private SQLiteDatabase db;
    private DaoSession daoSession;

    public SqlliteUtils() {
    }

//    //声明对象
//   private static SqlliteUtils mSqlliteUtils;
//
//    //获取对象
//    public static SqlliteUtils getSqlliteUtils() {
//        if (mSqlliteUtils == null) {
//            mSqlliteUtils=new SqlliteUtils();
//
//        }
//        return mSqlliteUtils;
//    }


    //初始化数据库
    public void init(Context context){
        DaoMaster.DevOpenHelper helper = new DaoMaster.DevOpenHelper(context, "lin");
        db = helper.getWritableDatabase();
        mdaoMaster = new DaoMaster(db);
        daoSession = mdaoMaster.newSession();

    }

    //zeng
    public void insert(User user){
        daoSession.getUserDao().insert(user);
    }

    //查询全部
    public List<User> queryAll(){
        return daoSession.getUserDao().loadAll();
    }

    //查询一条
    public User query(Long key){
        return daoSession.getUserDao().load(key);
    }

    //删除全部
    public void deleteAll(){
        daoSession.getUserDao().deleteAll();
    }

    //删除单个
    public void delete(String key){
        daoSession.getUserDao().deleteByKey(Long.parseLong(key));
    }

    //更新
    public void update(User user){
        daoSession.getUserDao().update(user);
    }





}

猜你喜欢