GreenDao3.0

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apply plugin: 'com.android.application'android {    compileSdkVersion 25    buildToolsVersion "25.0.3"    defaultConfig {        applicationId "com.anye.greendao"        minSdkVersion 15        targetSdkVersion 25        versionCode 1        versionName "1.0"    }    buildTypes {        release {            minifyEnabled false            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'        }    }}apply plugin: 'org.greenrobot.greendao'buildscript {    repositories {        mavenCentral()    }}greendao {    schemaVersion 1    daoPackage 'com.anye.greendao.gen'    targetGenDir 'src/main/java'}dependencies {    compile fileTree(dir: 'libs', include: ['*.jar'])    testCompile 'junit:junit:4.12'    compile 'com.android.support:appcompat-v7:25.0.0'    compile 'org.greenrobot:greendao:3.0.1'    compile 'org.greenrobot:greendao-generator:3.0.0'}

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属性介绍：
schemaVersion--> 指定数据库schema版本号，迁移等操作会用到;
daoPackage --> dao的包名，包名默认是entity所在的包；
targetGenDir --> 生成数据库文件的目录;

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// Top-level build file where you can add configuration options common to all sub-projects/modules.buildscript {    repositories {        jcenter()    }    dependencies {        classpath 'com.android.tools.build:gradle:2.3.1'        classpath 'org.greenrobot:greendao-gradle-plugin:3.0.0'        // NOTE: Do not place your application dependencies here; they belong        // in the individual module build.gradle files    }}allprojects {    repositories {        jcenter()    }}task clean(type: Delete) {    delete rootProject.buildDir}

创建一个User的实体类,MakeProject,实体类会自动编译，生成get、set方法并且会在com.anye.greendao.gen目录下生成三个文件；

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greendao中的注解

(一) @Entity 定义实体
@nameInDb 在数据库中的名字，如不写则为实体中类名
@indexes 索引
@createInDb 是否创建表，默认为true,false时不创建
@schema 指定架构名称为实体
@active 无论是更新生成都刷新
(二) @Id
(三) @NotNull 不为null
(四) @Unique 唯一约束
(五) @ToMany 一对多
(六) @OrderBy 排序
(七) @ToOne 一对一
(八) @Transient 不存储在数据库中
(九) @generated 由greendao产生的构造函数或方法

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package com.anye.greendao.db;import android.content.Context;import com.anye.greendao.gen.DaoMaster;import com.anye.greendao.gen.DaoSession;/** * Created by anye0 on 2016/7/24. */public class DBHelper {    private static DBHelper instance;    private static Context mContext;    private static DaoMaster daoMaster;    private static DaoSession daoSession;    /**     * 取得DaoMaster     *     * @param context     * @return     */    public static DaoMaster getDaoMaster(Context context) {        if (daoMaster == null) {            DaoMaster.OpenHelper helper = new DaoMaster.DevOpenHelper(context,                    "notes.db", null);            daoMaster = new DaoMaster(helper.getWritableDatabase());        }        return daoMaster;    }    /**     * 取得DaoSession     *     * @param context     * @return     */    public static DaoSession getDaoSession(Context context) {        if (daoSession == null) {            if (daoMaster == null) {                daoMaster = getDaoMaster(context);            }            daoSession = daoMaster.newSession();        }        return daoSession;    }    private DBHelper() {    }    public static void init(Context context) {        mContext = context;        instance = new DBHelper();        // 数据库对象        DaoSession daoSession = getDaoSession(mContext);    }    public static DBHelper getInstance() {        return instance;    }}

package com.anye.greendao.entity;import org.greenrobot.greendao.annotation.Entity;import org.greenrobot.greendao.annotation.Id;import org.greenrobot.greendao.annotation.Transient;import org.greenrobot.greendao.annotation.Generated;/** * Created by anye0 on 2016/7/24. */@Entitypublic class User {    @Id    private Long id;    private String name;    @Transient    private int tempUsageCount; // not persisted    public String getName() {        return this.name;    }    public void setName(String name) {        this.name = name;    }    public Long getId() {        return this.id;    }    public void setId(Long id) {        this.id = id;    }    @Generated(hash = 873297011)    public User(Long id, String name) {        this.id = id;        this.name = name;    }    @Generated(hash = 586692638)    public User() {    }}

package com.anye.greendao;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.view.View;import android.widget.Button;import android.widget.TextView;import android.widget.Toast;import com.anye.greendao.entity.User;import com.anye.greendao.gen.UserDao;import java.util.List;public class MainActivity extends AppCompatActivity implements View.OnClickListener {    private Button mAdd,mDelete,mUpdate,mFind;    private TextView mContext;    private User mUser,mUser1,mUser2,mUser3;    private UserDao mUserDao;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        initView();        initEvent();        mUserDao = MyApplication.getInstances().getDaoSession().getUserDao();    }    private void initEvent() {        mAdd.setOnClickListener(this);        mDelete.setOnClickListener(this);        mUpdate.setOnClickListener(this);        mFind.setOnClickListener(this);    }    private void initView() {        mContext = (TextView) findViewById(R.id.textView);        mAdd = (Button) findViewById(R.id.button);        mDelete = (Button) findViewById(R.id.button2);        mUpdate = (Button) findViewById(R.id.button3);        mFind = (Button) findViewById(R.id.button4);    }    @Override    public void onClick(View v) {        switch (v.getId()) {            case R.id.button:                addDate();                break;            case R.id.button2:                deleteDate();                break;            case R.id.button3:                updateDate();                break;            case R.id.button4:                findDate();                break;        }    }    /**     * 增加数据     */    private void addDate() {        mUser1 = new User((long)1,"anye3");        mUser2 = new User((long)2,"anye3");        mUser3 = new User((long)3,"anye3");        mUserDao.insert(mUser1);//添加一个        mUserDao.insert(mUser2);//添加一个        mUserDao.insert(mUser3);//添加一个        //mContext.setText(mUser.getName());        Toast.makeText(MainActivity.this,"点击添加",Toast.LENGTH_SHORT).show();    }    /**     * 删除数据     */    private void deleteDate() {        deleteUserById(2);    }    /**     * 根据主键删除User     *     * @param id User的主键Id     */    public void deleteUserById(long id) {        mUserDao.deleteByKey(id);        Toast.makeText(MainActivity.this,"点击删除  id--> "+id,Toast.LENGTH_SHORT).show();    }    /**     * 更改数据     */    private void updateDate() {        mUser = new User((long)1,"anye0803");        mUserDao.update(mUser);        Toast.makeText(MainActivity.this,"点击更改  id==1",Toast.LENGTH_SHORT).show();    }    /**     * 查找数据     */    private void findDate() {        List<User> users = mUserDao.loadAll();        String userName = "";        for (int i = 0; i < users.size(); i++) {            userName += users.get(i).getName()+",";        }        Toast.makeText(MainActivity.this,"点击查找",Toast.LENGTH_SHORT).show();        mContext.setText("查询全部数据==>"+userName);    }}

package com.anye.greendao;import android.app.Application;import android.database.sqlite.SQLiteDatabase;import com.anye.greendao.gen.DaoMaster;import com.anye.greendao.gen.DaoSession;/** * Created by anye0 on 2016/7/24. */public class MyApplication extends Application {    private DaoMaster.DevOpenHelper mHelper;    private SQLiteDatabase db;    private DaoMaster mDaoMaster;    private DaoSession mDaoSession;    public static MyApplication instances;    @Override    public void onCreate() {        super.onCreate();        instances = this;        setDatabase();    }    public static MyApplication getInstances(){        return instances;    }    /**     * 设置greenDao     */    private void setDatabase() {        // 通过 DaoMaster 的内部类 DevOpenHelper，你可以得到一个便利的 SQLiteOpenHelper 对象。        // 可能你已经注意到了，你并不需要去编写「CREATE TABLE」这样的 SQL 语句，因为 greenDAO 已经帮你做了。        // 注意：默认的 DaoMaster.DevOpenHelper 会在数据库升级时，删除所有的表，意味着这将导致数据的丢失。        // 所以，在正式的项目中，你还应该做一层封装，来实现数据库的安全升级。        mHelper = new DaoMaster.DevOpenHelper(this, "notes-db", null);        db = mHelper.getWritableDatabase();        // 注意：该数据库连接属于 DaoMaster，所以多个 Session 指的是相同的数据库连接。        mDaoMaster = new DaoMaster(db);        mDaoSession = mDaoMaster.newSession();    }    public DaoSession getDaoSession() {        return mDaoSession;    }    public SQLiteDatabase getDb() {        return db;    }}

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context="com.anye.greendao.MainActivity">    <TextView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="Hello World!"        android:id="@+id/textView"        android:layout_centerVertical="true"        android:layout_alignLeft="@+id/button4"        android:layout_alignStart="@+id/button4" />    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="增"        android:id="@+id/button"        android:layout_alignParentTop="true"        android:layout_alignParentLeft="true"        android:layout_alignParentStart="true" />    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="删"        android:id="@+id/button2"        android:layout_below="@+id/button"        android:layout_toLeftOf="@+id/button4"        android:layout_toStartOf="@+id/button4"        android:layout_marginRight="19dp"        android:layout_marginEnd="19dp" />    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="改"        android:id="@+id/button3"        android:layout_below="@+id/button2"        android:layout_alignLeft="@+id/button2"        android:layout_alignStart="@+id/button2" />    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="查"        android:id="@+id/button4"        android:layout_alignBaseline="@+id/button3"        android:layout_alignBottom="@+id/button3"        android:layout_centerHorizontal="true" /></RelativeLayout>

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