SQL을 Firebase로 다시 작성하기위한 치트 모음

RDS 데이터 구조

Firebase 데이터 구조

select * from Users where UID = 1;
conts oneRef = rootRef.child('users').child('1');

select * from Users where Email = '[email protected]';
cont twoRef = rootRef.child('users').orderByChild('email').equalTo('[email protected]');

select * from Users LIMIT 10;
const threeRef = rootRef.child('users').limitTofirst(10);

select * from Users where Name LIKE 'D%';
const fourRef = rootRef.child('users').orderByChild('name').startAt('D').endAt('D\ut8ff');

select * from Users where age < 50;
const fiveRef = rootRef.child('users').orderByChild('age').endAt(49);

select * from Users where age > 50;
const sixRef = rootRef.child('users').orderByChild('age').startAt(51);

select * from Users where age >= 20 $$ age <= 100;
const sevenRef = rootRef.child('users').orderByChild('age').startAt(20).endAt(100);

select * from Users where age = 28 && location = 'Tokyo'
↓This is NG!!↓
const eightRef = rootRef.child('users').orderByChild('age').equalTo(28)
                                       .orderByChild('location').equalTo('Berlin');
↓You should change Data structure of Object..When you use two conditions↓
const eightRef = rootRef.child('users').orderByChild('age_locatoin').equalTo('28_Tokyo');