GreenDao 简单编写

public class DbHelper {
    private static  volatile DbHelper instance;
    private final DaoSession daoSession;
    private final DaoMaster daoMaster;

    private DbHelper(Context context){
        DaoMaster.DevOpenHelper mHelper= new DaoMaster.DevOpenHelper(context,"user",null);
        SQLiteDatabase db = mHelper.getWritableDatabase();
        daoMaster = new DaoMaster(db);
        daoSession = daoMaster.newSession();
    }

    public  static  DbHelper getInstance(Context context){
        if (instance == null){
            synchronized (DbHelper.class){
                if (null == instance){
                    instance = new DbHelper(context);
                }
            }
        }
        return  instance;
    }

    public UserDao getUserDao(){
        return daoSession.getUserDao();
    }
}

 

public class MainActivity extends AppCompatActivity {

    @BindView(R.id.mytext)
    TextView mytext;
    private UserDao dao;

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

        dao = DbHelper.getInstance(this).getUserDao();
    }

    @OnClick({ R.id.btn_insert, R.id.btn_delete, R.id.btn_updata, R.id.btn_query})
    public void onViewClicked(View view) {
        switch (view.getId()) {
            case R.id.btn_insert:
                User user = new User();
                user.setName("佘鑫海");
                user.setAge(20);
                dao.insert(user);
                Toast.makeText(this,"添加成功"+user.toString(),Toast.LENGTH_SHORT).show();
                break;
            case R.id.btn_delete:
                User user1 = new User();
                user1.setId(5L);
                dao.delete(user1);
                Toast.makeText(this,"删除成功"+user1.toString(),Toast.LENGTH_SHORT).show();
                break;
            case R.id.btn_updata:
                User user2 = new User(2L,"蔡梦梦",20);
                dao.update(user2);
                Toast.makeText(this,"修改成功"+user2.toString(),Toast.LENGTH_SHORT).show();
                break;
            case R.id.btn_query:
                List<User> list = dao.queryRaw("where _id = ? and name = ?","4","佘鑫海");
                Toast.makeText(this,"查询成功"+list.toString(),Toast.LENGTH_SHORT).show();
                break;
        }
    }
}

 

buildscript {
    repositories {
        jcenter()
        mavenCentral()//这个
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:2.3.3'
        classpath 'org.greenrobot:greendao-gradle-plugin:3.2.1'//这个
        // 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
}

 

apply plugin: 'com.android.application'
apply plugin: 'org.greenrobot.greendao'//这个
android {
    compileSdkVersion 26
    buildToolsVersion "26.0.1"
    defaultConfig {
        applicationId "com.example.greendao"
        minSdkVersion 15
        targetSdkVersion 26
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
//这个
    greendao {
        schemaVersion 1
        daoPackage 'com.example.greendao.gen'
        targetGenDir 'src/main/java'
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
        exclude group: 'com.android.support', module: 'support-annotations'
    })
    compile 'com.android.support:appcompat-v7:26.+'
    compile 'com.android.support.constraint:constraint-layout:1.0.2'
    compile 'org.greenrobot:greendao:3.2.0'//这个
    compile 'com.jakewharton:butterknife:8.8.1'
    annotationProcessor 'com.jakewharton:butterknife-compiler:8.8.1'
    testCompile 'junit:junit:4.12'
}

 

@Entity
public class User {
    @Id
    private Long id;
    private String name;
    private int age;
    @Generated(hash = 1309193360)
    public User(Long id, String name, int 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 int getAge() {
        return this.age;
    }
    public void setAge(int age) {
        this.age = age;
    }

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

 

转载于:https://www.cnblogs.com/shexinhai/p/7931520.html