Configure plug-ins and dependencies

Under the project

-----------stay repositories Put the warehouse in the brackets of----
mavenCentral()

-------------Add plug-ins in parentheses of dependencies---------

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

---------------On the top of Build in app---------------------

apply plugin: 'org.greenrobot.greendao' 

----------------Build plus dependency in app----------------------

implementation 'org.greenrobot:greendao:3.2.2'

----------------On top of dependencies-----------

greendao {
schemaVersion 1  //Edition
daoPackage 'Package name.greendao' // Generally, it is the app package name + the folder name of the generated file
targetGenDir 'src/main/java' //Build file path
}

Write a Bean

After the annotation is written, press Ctrl+Fn+F9 to automatically generate Dao

@Entity
public class GBean {
@Id(autoincrement = true)//Primary key self increment
private Long id;

Generated files

Write a tool class for adding, deleting, modifying and querying

public class SqliteUtiles {
private SQLiteDatabase db;
private DaoMaster daoMaster;
private DaoSession daoSession;

//Single instance requires a private construct and a public static parameter
private SqliteUtiles() {
}
private static SqliteUtiles sqliteUtiles;
public static SqliteUtiles getSqliteUtiles() {
    //Judge whether it is empty
    if (sqliteUtiles == null) {
        sqliteUtiles = new SqliteUtiles();
    }
    return sqliteUtiles;
}
//Initialize database transfer context
public void init(Context context){
    //The Dev method of new daomaster returns a help class by passing the context database name
    DaoMaster.DevOpenHelper helper = new DaoMaster.DevOpenHelper(context, "g1");
    //Get db of write data
      db = helper.getWritableDatabase();
      daoMaster = new DaoMaster(db);//control class
      daoSession = daoMaster.newSession();//Initialization protocol
}
//increase
public void insert(User user){
    //Directly use daoSession to get the insert in the userdao call
    daoSession.getUserDao().insert(user);
}

//Check all
public List<User> chaAll(){
    //Query all
    return daoSession.getUserDao().loadAll();
}
//Single query
public User chaid(String key){
    //Transfer primary key Long object
    return daoSession.getUserDao().load(Long.parseLong(key));
}
//Single deletion
public void delid(String key){
 daoSession.getUserDao().deleteByKey(Long.parseLong(key));
}
//Delete all
public void delAll(){
  daoSession.getUserDao().deleteAll();
}
//modify
public void gai(User user){
    daoSession.getUserDao().update(user);
}
}

Use this tool class

First of all, the page initialization tool class in use must

 	   SqliteUtiles.getSqliteUtiles().init(this);

Here are a few buttons to show how to add, delete, modify and check

 @Override
public void onClick(View view) {
    switch (view.getId()) {
        case R.id.zeng://Directly call the add method in the tool class
            User user = new User();
            user.setAge(18);
            user.setName("high XX");
            user.setPsd("2452");
            user.setSex("male");
            SqliteUtiles.getSqliteUtiles().insert(user);
            break;
        case R.id.cha://query
            List<User> cha = SqliteUtiles.getSqliteUtiles().chaAll();
            for (int i = 0; i < cha.size(); i++) {
                Log.i("MainActivity", cha.get(i).getName()+"id: "+cha.get(i).getId()+"Gender:"+cha.get(i).getSex()+"Password:"+cha.get(i).getPsd()+"Age:"+cha.get(i).getAge());
            }
            break;
        case R.id.chaid:
            //key inside
            User chaid = SqliteUtiles.getSqliteUtiles().chaid("2");
            Log.i("MainActivity", "id: " + chaid.getId() + "Name:" + chaid.getName());
            break;
        case R.id.del:
            //Delete all
        SqliteUtiles.getSqliteUtiles().delAll();
            break;
        case R.id.delid:
        //Delete single
            SqliteUtiles.getSqliteUtiles().delid("1");

            break;
        case R.id.gai:
            //Query one before modifying
            User usergai = SqliteUtiles.getSqliteUtiles().chaid("19");
            usergai.setId(Long.parseLong("19"));
            usergai.setSex("female");
            usergai.setName("Horse XX");
            usergai.setPsd("123456");
            SqliteUtiles.getSqliteUtiles().gai(usergai);
            break;
    }
}