GreenDao

最新推荐文章于 2024-07-15 21:52:53 发布

lxrlxr888

最新推荐文章于 2024-07-15 21:52:53 发布

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本文链接：https://blog.youkuaiyun.com/lxrlxr888/article/details/78934542

本文详细介绍了如何在Android应用中使用GreenDao进行数据库操作，包括项目配置、Bean类定义、基本的增删改查操作等。

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项目导包

classpath'org.greenrobot:greendao-gradle-plugin:3.2.1'

model导包

compile 'org.greenrobot:greendao:3.2.0' compile 'org.greenrobot:greendao-generator:3.2.0'

接着在模块build.gradle的顶部添加
apply plugin: ‘org.greenrobot.greendao’

Bean 类的生成（快捷键ctrl+F9）

@Entity

publicclassUser {

@Id(autoincrement = true)

private Long id;

private String name;

private String sex;

privateint age;

privateint salary;

@Generated(hash = 257789183)

public class MyApplication extends Application {
    public static DaoSession daoSession;
    public static boolean ENCRYPTED;

    @Override
    public void onCreate() {
        super.onCreate();
        DaoMaster.DevOpenHelper helper = new  DaoMaster.DevOpenHelper(this, ENCRYPTED ? "users-db-encrypted" : "users-db");
        Database db =  helper.getWritableDb();
        daoSession = new DaoMaster(db).newSession();
    }
    public DaoSession getDaoSession() {
        return daoSession;
    }
}

//得到GreenDao的查询和修改的对象
private UserBeanDao userDao;
private Query<UserBean> userBeanQuery;

DaoSession daoSession = ((App) getApplication()).getDaoSession();
userDao = daoSession.getUserBeanDao();
userBeanQuery = userDao.queryBuilder().orderAsc(UserBeanDao.Properties.Id).build();

@Override
public void onClick(View v) {
    switch (v.getId()) {
        case R.id.add:
            userDao.insert(new UserBean( null, "张三", 18));
            userDao.insert(new UserBean( null, "李四", 20));
            break;
        case R.id.del:
            userDao.deleteByKey((long) 1);
            break;
        case R.id.update:
            UserBean userBean = userDao.load((long) 1);
            userBean.setName("王五");
            userDao.update(userBean);
            break;
        case R.id.query:
            List<UserBean> list = userBeanQuery.list();
            query_result.setText(list.toString());
            break;
    }
}