Android--> Realm (Database ORM) usage experience, lambda expression

Realm, born for mobile devices. Instead of SQLite and Core Data.

Very fortunate that the official help document is in Chinese: https://realm.io/cn/docs/java/latest/
Although the latest version number 0.88.3, even the 1.0 version number is not announced ... But it does not affect her strength at all;

API Document: https://realm.io/docs/java/latest/api/

Because of the official help documents, there are Chinese ... Everyone seems very easy to understand, I just based on personal experience, write experience.

References to 1:realm

Project-level Build.gradle files:

buildscript {    repositories {        jcenter()    }    dependencies {        ‘com.android.tools.build:gradle:2.1.0-beta3‘        ‘me.tatarka:gradle-retrolambda:3.3.0-beta4‘//lambda表达式配置步骤1        "io.realm:realm-gradle-plugin:0.88.3"//注意此行    }}allprojects {    repositories {        jcenter()    }}

Module-level Build.gradle

‘com.android.application‘‘me.tatarka.retrolambda‘ //lambda表达式配置步骤2‘realm-android‘ //注意此行android {    ...    //lambda表达式配置步骤3,结束.    compileOptions {        "UTF-8"        targetCompatibility JavaVersion.VERSION_1_8        sourceCompatibility JavaVersion.VERSION_1_8    }}dependencies {    ...}

(Egg: Above, includes configuration steps for lambda expressions ...) You know)

2: The operation of adding and deleting changes

//Encapsulated operation class Public  class rrealm {  /** * The method must be called */   Public Static void Init(context context, String name,BooleanClean) {Realmconfiguration configuration =NewRealmconfiguration.builder (context). Name. Build ();if(Clean)      {realm.deleterealm (configuration);  } realm.setdefaultconfiguration (configuration); } Public StaticRealmRealm() {returnRealm.getdefaultinstance (); }/** * is usually able to direct this method * /   Public Static void operate(Onoperate operate) {if(Operate! =NULL) {Realm realm = Realm ();          Realm.begintransaction ();          Operate.on (Realm);          Realm.committransaction ();      Realm.close (); }  } Public  interface onoperate {      voidOn (Realm realm); }}

Private void Add() {rrealm.operate (realm) { for(inti =0; i < Num;            i++) {Testrealmobject realmobject = Realm.createobject (Testrealmobject.class);            Realmobject.setage (i); Realmobject.setname ("Name"+ i); Realmobject.settest ("Test"+ i);        Realmobject.settime (System.currenttimemillis ()); }    });}Private void Delete() {rrealm.operate (realm) {realmresults<testrealmobject> all = realm.where(Testrealmobject.class). FindAll ();    All.clear (); });}Private void Update() {rrealm.operate (realm) {realmresults<testrealmobject> all = realm.where(Testrealmobject.class). FindAll (); for(inti =0; I < all.size (); i++) {TestrealmobjectObject= All.Get(i);Object. SetName (Object. GetName () +"New");Object. Settest (Object. Gettest () +"New"); }    });}Private void Query() {rrealm.operate (realm) {realmquery<testrealmobject>where= Realm.where(Testrealmobject.class); realmresults<testrealmobject> all =where. FindAll (); for(TestrealmobjectObject: All) {e (Object. toString ()); }    });}

3: Performance evaluation

//測试类publicclass TestRealmObject extends RealmObject {    public String name;    publicint age;    publiclong time;    public String test;}//插入1000条数据: 149 毫秒 148  158  118//查询1000条数据: 146 毫秒 183  178  192//删除1000条数据: 39  毫秒  44   37   38//更新1000条数据: 212 毫秒 195  185  216//数据仅供參考

Remind again: The official has the Chinese document, everybody can read concretely, will be better;

At this point: The article is over, if there is doubt: QQ Group: 274306954 welcome your increase.

Android--> Realm (Database ORM) usage experience, lambda expression