GreenDao

一

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:onClick="query"
        android:text="query" />

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:onClick="add"
        android:text="add" />

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:onClick="update"
        android:text="update" />

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:onClick="delete"
        android:text="delete" />


</LinearLayout>

二

package com.example.greendaodemotwo;

import org.greenrobot.greendao.annotation.Entity;
import org.greenrobot.greendao.annotation.Generated;
import org.greenrobot.greendao.annotation.Id;
import org.greenrobot.greendao.annotation.Property;
import org.greenrobot.greendao.annotation.Transient;

/**
 * Created by 。。。。 on 2018/11/1.
 */
@Entity(nameInDb = "person_table")
public class Person {
    @Id(autoincrement = true)
    public Long id;
    @Property(nameInDb = "username")
    public String name;
    public int age;
    @Transient
    public String identity;
    @Generated(hash = 1145075130)
    public Person(Long id, String name, int age) {
        this.id = id;
        this.name = name;
        this.age = age;
    }
    @Generated(hash = 1024547259)
    public Person() {
    }
    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;
    }

    @Override
    public String toString() {
        return "Person{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", age=" + age +
                ", identity='" + identity + '\'' +
                '}';
    }
}

三

package com.example.greendaodemotwo;

import android.content.Context;

/**
 * Created by 。。。。 on 2018/11/1.
 */

public class DaoManager {
    private static DaoManager insance;
    private DaoSession daoSession;

    private DaoManager(Context context) {
        daoSession=DaoMaster.newDevSession(context,"preson.db");
    }
    public static DaoManager getInsance(Context context){
        if(insance==null){
            synchronized (DaoManager.class){
                if(null==insance){
                    insance=new DaoManager(context);
                }
            }
        }
        return insance;
    }
    public  DaoSession getDaoSession(){
        return daoSession;
    }
}

四

package com.example.greendaodemotwo;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {

    private DaoSession daoSession;
    private PersonDao personDao;
    private int index;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        daoSession = DaoManager.getInsance(this).getDaoSession();
        personDao = daoSession.getPersonDao();
    }

    public void query(View view) {
        List<Person> list = personDao.queryBuilder()
                .where(PersonDao.Properties.Age.lt(500))
                .orderDesc(PersonDao.Properties.Age)
                .build()
                .list();
        for (Person person : list) {
            Log.e("tag", "query   " + person.toString());
        }

    }

    public void add(View view) {
        index++;
        Person person = new Person(null, "name" + index, index * 10);
        personDao.insert(person);
    }

    public void update(View view) {
        List<Person> list =personDao.queryBuilder()
                .where(PersonDao.Properties.Age.lt(500))
                .orderDesc(PersonDao.Properties.Age)
                .build()
                .list();
        for (Person person : list) {
            if (person.age == 20) {
                person.age = 100;
                personDao.update(person);
            }
        }
    }

    public void delete(View view) {
        Person person = personDao.queryBuilder()
                .where(PersonDao.Properties.Id.eq(2))
                .build()
                .unique();
        if (person != null) {
            personDao.delete(person);
        }
    }
}