GreenDao数据库简单使用

1.主build.gradle

// Top-level build file where you can add configuration options common to all sub-projects/modules.

buildscript {
    
    repositories {
        google()
        jcenter()
        mavenCentral() // add repository
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.1.2'
        classpath 'org.greenrobot:greendao-gradle-plugin:3.2.2' // add plugin
        

        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        google()
        jcenter()
    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

2.module的build.gradle

apply plugin: 'com.android.application'
apply plugin: 'org.greenrobot.greendao' // apply plugin
android {
    compileSdkVersion 27
    defaultConfig {
        applicationId "com.example.greendaodemo"
        minSdkVersion 15
        targetSdkVersion 27
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}
greendao {
    schemaVersion 1//数据库版本号
    daoPackage 'com.com.sky.downloader.greendao'//设置DaoMaster、DaoSession、Dao包名
    targetGenDir 'src/main/java'//设置DaoMaster、DaoSession、Dao目录
    //targetGenDirTest：设置生成单元测试目录
    //generateTests：设置自动生成单元测试用例
}
dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'com.android.support:appcompat-v7:27.1.1'
    implementation 'com.android.support.constraint:constraint-layout:1.1.0'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
    implementation 'org.greenrobot:greendao:3.2.2' // add library
}

3.Application中初始化

package com.example.greendaodemo.app;

import android.app.Application;

import com.example.greendaodemo.bean.DaoMaster;
import com.example.greendaodemo.bean.DaoSession;

public class MyApp extends Application {
    private DaoMaster daoMaster;
    private static DaoSession daoSession;

    @Override
    public void onCreate() {
        super.onCreate();
        //初始化GreenDao
        DaoMaster.DevOpenHelper devOpenHelper = new DaoMaster.DevOpenHelper(this, "baway.db");
        DaoMaster daoMaster = new DaoMaster(devOpenHelper.getWritableDb());
        daoSession = daoMaster.newSession();
    }

    public static DaoSession getDaoSession() {
        return daoSession;
    }
}

4.创建bean类User

package com.example.greendaodemo.bean;

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

@Entity(nameInDb = "t_user")
public class User {
    @Id(autoincrement = true)
    private Long id;
    @Property(nameInDb = "t_name")
    private String name;
    @Property
    private String age;
    @Transient
    private String agent;

    @Generated(hash = 1666193281)
    public User(Long id, String name, String age) {
        this.id = id;
        this.name = name;
        this.age = age;
    }

    @Generated(hash = 586692638)
    public User() {
    }

    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 String getAge() {
        return this.age;
    }

    public void setAge(String age) {
        this.age = age;
    }

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

5.MainActivity主要操作

package com.example.greendaodemo;

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

import com.example.greendaodemo.app.MyApp;
import com.example.greendaodemo.bean.DaoSession;
import com.example.greendaodemo.bean.User;
import com.example.greendaodemo.bean.UserDao;

import java.util.List;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    /**
     * 增
     */
    private Button mBtInsert;
    /**
     * 删
     */
    private Button mBtDel;
    /**
     * 改
     */
    private Button mBtUpdate;
    /**
     * 查
     */
    private Button mBtSelect;
    private DaoSession daoSession;
    private UserDao userDao;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();
        daoSession = MyApp.getDaoSession();
        userDao = daoSession.getUserDao();

    }

    private void initView() {
        mBtInsert = (Button) findViewById(R.id.btInsert);
        mBtInsert.setOnClickListener(this);
        mBtDel = (Button) findViewById(R.id.btDel);
        mBtDel.setOnClickListener(this);
        mBtUpdate = (Button) findViewById(R.id.btUpdate);
        mBtUpdate.setOnClickListener(this);
        mBtSelect = (Button) findViewById(R.id.btSelect);
        mBtSelect.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            default:
                break;
            case R.id.btInsert:
                for (int i = 1; i <= 10; i++) {
                    User user = new User();
                    user.setName("name_" + i);
                    user.setAge("age_" + i);
                    userDao.insert(user);
                }
                break;
            case R.id.btDel:

                User user = new User();
                user.setId(1L);
                user.setName("name_1");
                user.setAge("age_1");

//                userDao.delete(user);
                userDao.deleteByKey(2L);

                break;
            case R.id.btUpdate:
                User user1 = new User();
                user1.setId(1L);
                user1.setName("用户");
                user1.setAge("21");
                userDao.update(user1);
                break;
            case R.id.btSelect:
                select3();
                break;
        }
    }

    private void select3(){
        List<User> list = userDao.queryBuilder().orderDesc(UserDao.Properties.Id).build().list();
        for (int i = 0; i < list.size(); i++) {
            Log.e("MainActivity", list.get(i).toString());
        }
    }

    private void select2() {
        List<User> list = userDao.queryBuilder().where(UserDao.Properties.Id.eq("3")).build().list();
        for (int i = 0; i < list.size(); i++) {
            Log.e("MainActivity", list.get(i).toString());
        }
    }

    private void select1() {
        List<User> list = userDao.queryBuilder().build().list();
        for (int i = 0; i < list.size(); i++) {
            Log.e("MainActivity", list.get(i).toString());
        }
    }
}