GreenDao的简单使用

1.添加依赖

compile'org.greenrobot:greendao:3.0.1'
compile'org.greenrobot:greendao-generator:3.0.0'

2.在app下build.gradle中添加配置

在最上面添加这一行

apply plugin: 'org.greenrobot.greendao'

在android下添加这几行分别是版本 包名 地址

greendao {
        schemaVersion 1
        daoPackage 'huxiangjun1508b20171106.bwie.com.greendaostudy'
        targetGenDir 'src/main/java'
    }

3.在项目的build.gradle中dependencies里添加

classpath 'org.greenrobot:greendao-gradle-plugin:3.0.0'

4.写一个bean类,切记不要忘了加注解,然后编译会出来三个类

@Entity
public class User {

    @Id
    private Long id;
    @Property(nameInDb = "username")
    private String username;
    public String getUsername() {
        return this.username;
    }
    public void setUsername(String username) {
        this.username = username;
    }
    public Long getId() {
        return this.id;
    }
    public void setId(Long id) {
        this.id = id;
    }
    @Generated(hash = 79420138)
    public User(Long id, String username) {
        this.id = id;
        this.username = username;
    }
    @Generated(hash = 586692638)
    public User() {
    }

}

5.创建一个MyApp初始化

public class MyApp extends Application {

    private static MyApp myApp;
    private DaoSession daoSession;

    @Override
    public void onCreate() {
        super.onCreate();
        myApp = this;

        setDb();
    }



    public static MyApp getMyApp(){
        return myApp;
    }

    private void setDb() {
        DaoMaster.DevOpenHelper helper = new DaoMaster.DevOpenHelper(this , "mydb" , null);
        SQLiteDatabase db = helper.getWritableDatabase();
        DaoMaster daoMaster = new DaoMaster(db);
        daoSession = daoMaster.newSession();
    }


    public DaoSession getdaoSession(){
        return daoSession;
    }
}

6.在mainactivity中写逻辑

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    private Button bt_add , bt_delete , bt_find , bt_updata;
    private UserDao userDao;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        bt_add = (Button) findViewById(R.id.bt_add);
        bt_delete  = (Button) findViewById(R.id.bt_delete);
        bt_find = (Button) findViewById(R.id.bt_find);
        bt_updata = (Button) findViewById(R.id.bt_updata);
        bt_add.setOnClickListener(this);
        bt_delete.setOnClickListener(this);
        bt_find.setOnClickListener(this);
        bt_updata.setOnClickListener(this);

        DaoSession daoSession = MyApp.getMyApp().getdaoSession();
        userDao = daoSession.getUserDao();
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()){
            case R.id.bt_add:
                List users = new ArrayList<>();
                User user = new User(Long.valueOf(1), "陈琳");
                User user2 = new User(Long.valueOf(2), "胡相旭");
                users.add(user);
                users.add(user2);

                for (int i = 0; i < users.size(); i++) {
                    userDao.insert(users.get(i));
                }
                Toast.makeText(this , "添加数据成功" , Toast.LENGTH_SHORT ).show();
                break;
            case R.id.bt_delete:
                User delete = userDao.load(Long.valueOf(1));
                userDao.delete(delete);
                Toast.makeText(this , "删除数据成功" , Toast.LENGTH_SHORT ).show();
                break;
            case R.id.bt_find:
                User load = userDao.load(Long.valueOf(1));
                String username = load.getUsername();
                Toast.makeText(this , "查询数据成功" + username , Toast.LENGTH_SHORT ).show();

                List userList = userDao.loadAll();
                for (User userinfo : userList){
                    String username1 = userinfo.getUsername();
                    Toast.makeText(this , "查询数据成功" + username1 , Toast.LENGTH_SHORT ).show();

                }
                break;
            case R.id.bt_updata:
                User updata = userDao.load(Long.valueOf(1));
                updata.setUsername("陈琳白痴");
                userDao.update(updata);
                break;
        }
    }
}

7.布局

    android:orientation="vertical"
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    >

            android:id="@+id/bt_add"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="添加数据"
        />

            android:id="@+id/bt_delete"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="删除数据"
        />

            android:id="@+id/bt_updata"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="更新数据"
        />

            android:id="@+id/bt_find"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="查询数据"
        />