Android Realm初试-蒲公英云

Android Realm初试

Realm is a mobile database that runs directly inside phones, tablets or wearables. This repository holds the source code for the Java version of Realm, which currently runs only on Android.

Realm是一个移动端的数据库，它可以在手机、平板。穿戴设备上运行。这个仓库的代码是一个Java版本的代码，目前只用在安卓端。

摘自：https://github.com/realm/realm-java

导入JAR

compile 'io.realm:realm-android:0.87.0'

在Application 中配置，不配置也可以，就是默认的哦。

public class MyApplication extends Application { 
    @Override
    public void onCreate() {
        super.onCreate();
        initRealm();
    }
    private void initRealm(){
        RealmConfiguration configuration = new RealmConfiguration
                .Builder(this)
                .name("test.realm")
                .deleteRealmIfMigrationNeeded()
                .schemaVersion(7).migration(new RealmMigration() {
                    @Override
                    public void migrate(DynamicRealm realm, long oldVersion, long newVersion) {
                    }
                }).build();
        Realm.setDefaultConfiguration(configuration);
    }
}

创建实体类，需集成RealmObject

public class User extends RealmObject{ 
    @PrimaryKey
    private String id;
    private String userName;
    private String mobile;
    public String getId() {
        return id;
    }
    public void setId(String id) {
        this.id = id;
    }
    public String getUserName() {
        return userName;
    }
    public void setUserName(String userName) {
        this.userName = userName;
    }
    public String getMobile() {
        return mobile;
    }
    public void setMobile(String mobile) {
        this.mobile = mobile;
    }
}

在Activity中初始化

Realm myRealm ; myRealm= Realm.getInstance(this);

添加数据：

//Realm开始处理事物  方式1：
        myRealm.beginTransaction();
        User user = myRealm.createObject(User.class);
        user.setId("445115");
        user.setMobile("44545");
        user.setUserName("hha");
        myRealm.commitTransaction();
        //方式2：
  User user2=new User();
        user2.setId("1123");
        user2.setUserName("sss");
        user2.setMobile("445");
        myRealm.beginTransaction();
        User userCopy2 = myRealm.copyToRealm(user2);
        myRealm.commitTransaction();

查找数据

RealmResults<User> listUser = myRealm.where(User.class).findAll();
        StringBuilder stringBuilder=new StringBuilder();
        for(User u:listUser) {
            stringBuilder.append(u.getUserName()+"--------****--------- ");
            Log.d("results1",u.getUserName());
        }
        tv.setText(stringBuilder.toString());