Query Cookbook

리액트 네이티브에서 parse 쿼리 요리책 소개 우리는 이미 parse query parse query 를 사용하여 get get 를 통해 단일 parse object parse object 를 back4app에서 검색하는 방법을 보았습니다 parse query parse query 를 사용하여 데이터를 검색하는 다른 방법이 많이 있습니다 여러 개체를 한 번에 검색하거나, 검색하려는 개체에 조건을 사용할 수 있습니다 이 가이드에서는 parse query parse query 클래스에 대해 깊이 파고들고 쿼리를 작성하는 데 사용할 수 있는 모든 메서드를 살펴볼 것입니다 간단한 데이터베이스 클래스를 사용하여 back4app의 자바스크립트 콘솔을 통해 쿼리를 수행할 것입니다 전제 조건 이 튜토리얼을 완료하려면 다음이 필요합니다 back4app에서 생성된 앱 목표 다양한 메서드를 가진 parse query parse query 클래스를 탐색합니다 parse query 클래스 parse에서의 모든 쿼리 작업은 parse query parse query 객체 유형을 사용하며, 이는 앱 전반에 걸쳐 back4app에서 특정 데이터를 검색하는 데 도움이 됩니다 새로운 parse query parse query , 생성하려면 원하는 parse object parse object 하위 클래스를 매개변수로 전달해야 하며, 이는 쿼리 결과를 포함할 것입니다 중요한 점은 parse query parse query 는 retrieve 메서드(예 parse query find parse query find 또는 parse query get parse query get 호출 후에만 해결된다는 것입니다 따라서 쿼리를 설정하고 실제로 호출되기 전에 여러 수정자를 연결할 수 있습니다 더 많은 정보는 parse query parse query 클래스에 대해 공식 문서에서 여기 https //parseplatform org/parse sdk js/api/master/parse query html back4app에서 js 콘솔 사용하기 back4app 애플리케이션 대시보드 내에서 javascript 코드를 직접 실행할 수 있는 매우 유용한 api 콘솔을 찾을 수 있습니다 이 가이드를 사용하여 back4app에서 데이터 객체를 저장하고 쿼리할 것입니다 앱의 주요 대시보드에서 core >api console >js console core >api console >js console 데이터 객체 저장하기 이 가이드를 기반으로 쿼리를 실행하려면 먼저 앱에 데이터를 채워야 합니다 유명인 이름과 다음 필드를 사용하여 소셜 미디어 프로필 클래스를 모방하는 profile이라는 샘플 클래스를 만들어 보겠습니다 문자열 타입 이름 이름 날짜 타입 생일 생일 숫자 (정수) 타입 친구 수 친구 수 배열 (문자열 배열) 타입 좋아하는 음식 좋아하는 음식 배열 (숫자 배열) 타입 행운의 숫자 행운의 숫자 geopoint 타입 로그인 위치 로그인 위치 nullable 포인터 타입 프리미엄 멤버십 프리미엄 멤버십 , 관련된 멤버십 멤버십 클래스는 문자열 이름 이름 과 날짜 만료 날짜 만료 날짜 필드를 포함합니다 여기 parse object parse object 클래스 생성 코드가 있으니, api 콘솔에서 실행해 보세요 1 // add profile objects and create table 2 // adam sandler 3 let profile = new parse object('profile'); 4 profile set('name', 'adam sandler'); 5 profile set('birthday', new date('09/09/1966')); 6 profile set('friendcount', 2); 7 profile set('favoritefoods', \['lobster', 'bread']); 8 profile set('luckynumbers', \[2, 7]); 9 profile set('lastloginlocation', new parse geopoint(37 38412167489413, 122 01268034622319)); 10 await profile save(); 11	 12 // britney spears 13 profile = new parse object('profile'); 14 profile set('name', 'britney spears'); 15 profile set('birthday', new date('12/02/1981')); 16 profile set('friendcount', 52); 17 profile set('favoritefoods', \['cake', 'bread']); 18 profile set('luckynumbers', \[22, 7]); 19 profile set('lastloginlocation', new parse geopoint(37 38412167489413, 122 01268034622319)); 20 await profile save(); 21	 22 // carson kressley 23 profile = new parse object('profile'); 24 profile set('name', 'carson kressley'); 25 profile set('birthday', new date('11/11/1969')); 26 profile set('friendcount', 12); 27 profile set('favoritefoods', \['fish', 'cookies']); 28 profile set('luckynumbers', \[8, 2]); 29 profile set('lastloginlocation', new parse geopoint(37 38412167489413, 122 01268034622319)); 30 await profile save(); 31	 32 // dan aykroyd 33 // creates related object membership for this user only 34 let membership = new parse object('membership'); 35 membership set('name', 'premium'); 36 membership set('expirationdate', new date('10/10/2030')) 37 await membership save(); 38 profile = new parse object('profile'); 39 profile set('name', 'dan aykroyd'); 40 profile set('birthday', new date('07/01/1952')); 41 profile set('friendcount', 66); 42 profile set('favoritefoods', \['jam', 'peanut butter']); 43 profile set('luckynumbers', \[22, 77]); 44 profile set('lastloginlocation', new parse geopoint(37 38412167489413, 122 01268034622319)); 45 profile set('premiummembership', membership); 46 await profile save(); 47	 48 // eddie murphy 49 profile = new parse object('profile'); 50 profile set('name', 'eddie murphy'); 51 profile set('birthday', new date('04/03/1961')); 52 profile set('friendcount', 49); 53 profile set('favoritefoods', \['lettuce', 'pepper']); 54 profile set('luckynumbers', \[6, 5]); 55 profile set('lastloginlocation', new parse geopoint( 27 104919974838154, 52 61428045237739)); 56 await profile save(); 57	 58 // fergie 59 profile = new parse object('profile'); 60 profile set('name', 'fergie'); 61 profile set('birthday', new date('03/27/1975')); 62 profile set('friendcount', 55); 63 profile set('favoritefoods', \['lobster', 'shrimp']); 64 profile set('luckynumbers', \[13, 7]); 65 profile set('lastloginlocation', new parse geopoint( 27 104919974838154, 52 61428045237739)); 66 await profile save(); 67	 68 console log('success!'); 이 코드를 실행한 후, 데이터베이스에 프로필 프로필 클래스가 생성된 여섯 개의 객체와 함께 있어야 합니다 새로운 클래스는 다음과 같아야 합니다 이제 모든 parse query parse query 메서드의 예를 살펴보면서 그들이 하는 일에 대한 간단한 설명을 추가하겠습니다 이 목록의 일부 메서드는 옵션 옵션 을 추가 인수로 받을 수 있지만, 대부분의 경우 이는 masterkey masterkey 사용과 관련이 있으며 이 가이드 내용과는 관련이 없으므로, 관련이 없는 경우 이 가능성은 생략됩니다 쿼리 검색기 이 방법들은 쿼리를 실행하고 결과를 검색하는 책임이 있으며, 항상 쿼리 구현에 존재합니다 cancel //cancels the current network request 1 let query = new parse query('profile'); 2 let queryresult = await query find(); 3 // this is hard to test in small databases, since by the time 4 // "cancel" is called, the "find" request is already resolved 5 queryresult = query cancel(); 6 console log(queryresult); count //retrieves the count of parse object results that meet the query criteria 1 let query = new parse query('profile'); 2 let queryresult = await query count(); 3 console log(queryresult); distinct //runs the query and returns a list of unique values from the results and the specified key 1 let query = new parse query('profile'); 2 let queryresult = await query distinct('favoritefoods'); 3 console log(queryresult); find //this is the basic method for retrieving your query results, always returning an array of parse object instances, being empty when none are found 1 let query = new parse query('profile'); 2 // when using find() in a query without other operations, you will 3 // get every object saved in your class 4 let queryresult = await query find(); 5 console log(queryresult); findall //retrieves a complete list of parse objects that satisfy this query 1 let query = new parse query('profile'); 2 // when using findall() in a query without other operations, you will 3 // get every object saved in your class 4 let queryresult = await query findall(); 5 console log(queryresult); first //retrieves the first parse object instance that meets the query criteria 1 let query = new parse query('profile'); 2 // pay attention to your query ordering when using first 3 let queryresult = await query first(); 4 console log(queryresult); get //this quick method is used to retrieve a single parse object instance when you know its objectid 1 let query = new parse query('profile'); 2 // since objectid is randomly set in your database, make sure to inform a 3 // valid one when testing this method 4 let queryresult = await query get('c6endlnfdq'); 5 console log(queryresult); 쿼리 조건자 이 방법들은 쿼리에 조건부 제약을 적용할 수 있는 가능성을 제공합니다 이는 쿼리에서 가장 중요한 작업이라고 할 수 있습니다 이러한 작업은 결과가 검색되기 전에 모두 연결할 수 있으므로, 쿼리 요구 사항을 해결하기 위해 많은 조합을 달성할 수 있습니다 addcondition // helper that is called by parse for filtering objects using conditional constants, such as “$gt”, “$eq” and so on only usable by users in very specific cases 1 let query = new parse query('profile'); 2 query addcondition('friendcount', '$gt', 25); 3 let queryresult = await query find(); 4 console log(queryresult); regexstartwith //helper used by parse that converts string for regular expression at the beginning 1 let query = new parse query('profile'); 2 let result = query regexstartwith('text'); 3 console log(result); containedby //filters objects in which a key value must be contained by the provided array of values get objects where all array elements match 1 let query = new parse query('profile'); 2 query containedby('luckynumbers', \[2, 7]); 3 let queryresult = await query find(); 4 console log(queryresult); containedin //filters objects in which a key value is contained in the provided array of values 1 let query = new parse query('profile'); 2 // containedin can be used on any data type such as numbers and strings 3 query containedin('luckynumbers', \[2, 7]); 4 let queryresult = await query find(); 5 console log(queryresult); contains //filters objects in which a string key value contains the provided text value be aware that this condition is case sensitive 1 let query = new parse query('profile'); 2 // this can be slow in large databases and are case sensitive 3 query contains('name', 'da'); 4 let queryresult = await query find(); 5 console log(queryresult); containsall //filters objects in which an array type key value must contain every value provided 1 let query = new parse query('profile'); 2 query containsall('luckynumbers', \[2, 7]); 3 let queryresult = await query find(); 4 console log(queryresult); containsallstartingwith //filters objects in which an array type key value must contain every string value provided 1 let query = new parse query('profile'); 2 // these should be string values 3 query containsallstartingwith('favoritefoods', \['shrimp', 'lobster']); 4 let queryresult = await query find(); 5 console log(queryresult); doesnotexist //filters objects in which a key value is not set 1 let query = new parse query('profile'); 2 query doesnotexist('premiummembership'); 3 let queryresult = await query find(); 4 console log(queryresult); doesnotmatchkeyinquery // requires that a key’s value does not match a value in an object returned by a different parse query useful for multi object querying 1 let query = new parse query('profile'); 2 // multiple queries can be combined using this, useful when there are more objects 3 // related, not our example case 4 query doesnotmatchkeyinquery('friendcount', 'friendcount', new parse query('profile') lessthan('friendcount', 50)); 5 query greaterthan('friendcount', 10); 6 let queryresult = await query find(); 7 console log(queryresult); doesnotmatchquery //requires that an object contained in the given key does not match another query useful for multi object querying 1 let innerquery = new parse query('membership'); 2 innerquery greaterthan('expirationdate', new date()); 3 let query = new parse query('profile'); 4 query exists('premiummembership'); 5 query doesnotmatchquery('premiummembership', innerquery); 6 let queryresult = await query find(); 7 console log(queryresult); endswith //filters objects in which a string key’s value ends with the provided text value 1 let query = new parse query('profile'); 2 // this is faster than other string searches by using backend index 3 query endswith('name', 'ie'); 4 let queryresult = await query find(); 5 console log(queryresult); equalto //filters objects in which a specific key’s value is equal to the provided value 1 let query = new parse query('profile'); 2 // equalto can be used in any data type 3 query equalto('friendcount', 2); 4 let queryresult = await query find(); 5 console log(queryresult); exists //filters objects in which a key value is set 1 let query = new parse query('profile'); 2 query exists('premiummembership'); 3 let queryresult = await query find(); 4 console log(queryresult); fulltext //filters objects in which a string key’s value wrap matches the provided text value in it it can have many customizable options to improve its results, like language specification and score order check the parse docs to have a complete understanding of that 1 let query = new parse query('profile'); 2 // fulltext can be very powerful in text search queries, but 3 // also slow in large datasets when its options are not optimized 4 query fulltext('name', 'spears', { diacriticsensitive false, casesensitive false }); 5 // in order to sort you must use select and ascending ($score is required) 6 query ascending('$score'); 7 query select('$score'); 8 let queryresult = await query find(); 9 console log(queryresult); greaterthan //filters objects in which a specific key’s value is greater than the provided value 1 let query = new parse query('profile'); 2 // greaterthan can be used on numbers and dates 3 query greaterthan('birthday', new date('08/19/1980')); 4 let queryresult = await query find(); 5 console log(queryresult); greaterthanorequalto //filters objects in which a specific key’s value is greater than or equal to the provided value 1 let query = new parse query('profile'); 2 // greaterthanorequalto can be used on numbers and dates 3 query greaterthanorequalto('friendcount', 49); 4 let queryresult = await query find(); 5 console log(queryresult); lessthan // filters objects in which a specific key’s value is lesser than the provided value 1 let query = new parse query('profile'); 2 // lessthan can be used on numbers and dates 3 query lessthan('birthday', new date('08/19/1980')); 4 let queryresult = await query find(); 5 console log(queryresult); lessthanorequalto //filters objects in which a specific key’s value is lesser than or equal to the provided value 1 let query = new parse query('profile'); 2 // lessthanorequalto can be used on numbers and dates 3 query lessthanorequalto('friendcount', 49); 4 let queryresult = await query find(); 5 console log(queryresult); matches //filters objects in which a string type key value must match the provided regular expression and its modifiers 1 let query = new parse query('profile'); 2 // using the "i" modifier is a quick way to achieve 3 // case insensitive string querying 4 query matches('name', 'da', 'i'); 5 let queryresult = await query find(); 6 console log(queryresult); matcheskeyinquery //requires that a key’s value matches a value in an object returned by a different parse query useful for multi object querying 1 let query = new parse query('profile'); 2 // multiple queries can be combined using this, useful when there are more objects 3 // related, not our example case 4 query matcheskeyinquery('friendcount', 'friendcount', new parse query('profile') lessthan('friendcount', 50)); 5 query greaterthan('friendcount', 10); 6 let queryresult = await query find(); 7 console log(queryresult); matchesquery //requires that an object contained in the given key matches another query useful for multi object querying 1 let innerquery = new parse query('membership'); 2 innerquery greaterthan('expirationdate', new date()); 3 let query = new parse query('profile'); 4 query exists('premiummembership'); 5 query matchesquery('premiummembership', innerquery); 6 let queryresult = await query find(); 7 console log(queryresult); notequalto //filters objects in which a specific key’s value is not equal to the provided value 1 let query = new parse query('profile'); 2 // notequalto can be used in any data type 3 query notequalto("friendcount", 2); 4 let queryresult = await query find(); 5 console log(queryresult); startswith //filters objects in which a string key’s value starts with the provided text value 1 let query = new parse query('profile'); 2 // this is faster than other string searches by using backend index 3 query startswith('name', 'brit'); 4 let queryresult = await query find(); 5 console log(queryresult); 쿼리 정렬 대부분의 쿼리에서 필수적이며, parse에서 정렬을 쉽게 달성할 수 있으며 두 개 이상의 정렬 제약 조건 간에 연결할 수도 있습니다 addascending // sort the results in ascending order, overwrites previous orderings multiple keys can be used to solve ordering ties 1 let query = new parse query('profile'); 2 query addascending('friendcount'); 3 let queryresult = await query find(); 4 console log(queryresult); adddescending //sort the results in descending order, overwrites previous orderings multiple keys can be used to solve ordering ties 1 let query = new parse query('profile'); 2 query adddescending('friendcount'); 3 let queryresult = await query find(); 4 console log(queryresult); ascending //sort the results in ascending order, this can be chained without overwriting previous orderings multiple keys can be used to solve ordering ties 1 let query = new parse query('profile'); 2 query ascending('friendcount'); 3 let queryresult = await query find(); 4 console log(queryresult); descending //sort the results in descending order, this can be chained without overwriting previous orderings multiple keys can be used to solve ordering ties 1 let query = new parse query('profile'); 2 query descending('friendcount'); 3 let queryresult = await query find(); 4 console log(queryresult); sortbytextscore //sorts by text score when using parse query fulltext 1 let query = new parse query('profile'); 2 query fulltext('name', 'dan', { diacriticsensitive false, casesensitive false }); 3 query sortbytextscore(); 4 let queryresult = await query find(); 5 console log(queryresult); 필드 선택 이 메서드는 쿼리 결과에 포함될 수 있는 필드 값을 결정합니다 exclude // return all fields in the returned objects except the ones specified 1 let query = new parse query('profile'); 2 query exclude('name'); 3 let queryresult = await query find(); 4 console log(queryresult\[0] get('name') === undefined); 5 console log(queryresult\[0] get('birthday')); include //includes nested parse objects for the provided key 1 let query = new parse query('profile'); 2 query exists('premiummembership'); 3 query include('premiummembership'); 4 let queryresult = await query find(); 5 console log(queryresult\[0] get('premiummembership')); includeall //includes all nested parse objects 1 let query = new parse query('profile'); 2 query exists('premiummembership'); 3 query includeall(); 4 let queryresult = await query find(); 5 console log(queryresult\[0] get('premiummembership')); select //return only the specified fields in the returned objects 1 let query = new parse query('profile'); 2 query select('name'); 3 let queryresult = await query find(); 4 console log(queryresult\[0] get('birthday') === undefined); 5 console log(queryresult\[0] get('name')); 지오포인트 쿼리 이들은 지오포인트 쿼리에 특정한 방법입니다 near // order objects by how near the key value is from the given geopoint 1 let query = new parse query('profile'); 2 query near('lastloginlocation', new parse geopoint(37 38412167489413, 122 01268034622319)); 3 let queryresult = await query find(); 4 console log(queryresult); polygoncontains //find objects whose key value contains the specified geopoint 1 let query = new parse query('profile'); 2 query polygoncontains('lastloginlocation', new parse geopoint(37 38412167489413, 122 01268034622319)); 3 let queryresult = await query find(); 4 console log(queryresult); withingeobox //find objects whose key value is contained within the specified bounding box, composed by two geopoint values that set the lower left and upper right corner values 1 let query = new parse query('profile'); 2 query withingeobox('lastloginlocation', new parse geopoint(37 48412167489413, 122 11268034622319), new parse geopoint(37 28412167489413, 121 91268034622319)); 3 let queryresult = await query find(); 4 console log(queryresult); withinkilometers //find objects whose key value is near the given geopoint and within the maxdistance value the sorted boolean value determines if the results should be sorted by distance ascending 1 let query = new parse query('profile'); 2 query withinkilometers('lastloginlocation', new parse geopoint(37 38412167489413, 122 01268034622319), 100, true); 3 let queryresult = await query find(); 4 console log(queryresult); withinmiles //find objects whose key value is near the given geopoint and within the maxdistance value the sorted boolean value determines if the results should be sorted by distance ascending 1 let query = new parse query('profile'); 2 query withinmiles('lastloginlocation', new parse geopoint(37 38412167489413, 122 01268034622319), 60, true); 3 let queryresult = await query find(); 4 console log(queryresult); withinpolygon //find objects whose key value is contained within the specified polygon, composed of an array of geopoints (at least three) if the polygon path is open, it will be closed automatically by parse connecting the last and first points 1 let query = new parse query('profile'); 2 query withinpolygon('lastloginlocation', \[new parse geopoint(37 48412167489413, 122 11268034622319), new parse geopoint(37 48412167489413, 121 91268034622319), new parse geopoint(37 28412167489413, 121 91268034622319), new parse geopoint(37 28412167489413, 122 01268034622319)]); 3 let queryresult = await query find(); 4 console log(queryresult); withinradians //find objects whose key value is near the given geopoint and within the maxdistance value the sorted boolean value determines if the results should be sorted by distance ascending 1 let query = new parse query('profile'); 2 query withinradians('lastloginlocation', new parse geopoint(37 38412167489413, 122 01268034622319), 1 5, true); 3 let queryresult = await query find(); 4 console log(queryresult); 페이지 매김 이 방법들은 많은 결과를 검색할 쿼리에 유용한 페이지 매김 유틸리티와 관련이 있습니다 limit // sets the maximum value of returned results, the default value is 100 1 let query = new parse query('profile'); 2 query limit(2); 3 let queryresult = await query find(); 4 console log(queryresult); skip //skips the first n results in the query, essential for pagination 1 let query = new parse query('profile'); 2 query skip(2); 3 let queryresult = await query find(); 4 console log(queryresult); withcount //sets a flag that will wrap or not the query response in an object containing results, holding the array of parse object and count integer holding the total number of results 1 let query = new parse query('profile'); 2 query withcount(true); 3 let queryresult = await query find(); 4 console log(queryresult); 응답 처리 이 방법들은 쿼리 응답을 처리하기 위한 도우미로, 쿼리가 해결된 후 호출될 콜백을 큐에 추가할 수 있게 해줍니다 이들은 쿼리 해결자 역할도 하며, find find 및 first first 과 같습니다 each // iterates over each result from the query and calls a callback for each one, in an unspecified order note that execution will halt on a rejected promise, so make sure to handle this case if using promises 1 let query = new parse query('profile'); 2 let queryresult = await query each((result) => console log(result)); 3 console log(queryresult); eachbatch //iterates over each result from the query and calls a callback for each batch of results, in an unspecified order the batchsize value needs to be passed inside the options object parameter, being the default 100 note that execution will halt on a rejected promise, so make sure to handle this case if using promises 1 let query = new parse query('profile'); 2 let queryresult = await query eachbatch((result) => console log(result), {batchsize 2}); 3 console log(queryresult); filter //iterates over each result from the query and calls a callback for each one, in an unspecified order note that execution will halt on a rejected promise, so make sure to handle this case if using promises differs from each for passing more parameters down on callback execution 1 let query = new parse query('profile'); 2 let queryresult = await query filter((currentobject, index, query) => console log(`${index} ${currentobject} ${query}`)); 3 console log(queryresult); map //iterates over each result from the query and calls a callback for each one, in an unspecified order note that execution will halt on a rejected promise, so make sure to handle this case if using promises differs from each for passing more parameters down on callback execution 1 let query = new parse query('profile'); 2 let queryresult = await query map((currentobject, index, query) => console log(`${index} ${currentobject} ${query}`)); 3 console log(queryresult); reduce //iterates over each result from the query and calls a callback for each one, in an unspecified order note that execution will halt on a rejected promise, so make sure to handle this case if using promises differs from each for passing more parameters down on callback execution and by allowing direct accumulator handling the initialvalue is the value to use as the first argument to the first call of the callback if no initialvalue is supplied, the first object in the query will be used and skipped 1 let query = new parse query('profile'); 2 let queryresult = await query reduce((accumulator, currentobject, index) => console log(`${index} ${currentobject} ${accumulator}`)); 3 console log(queryresult); 복합 쿼리 이 방법들은 복합 쿼리를 생성하며, 이는 하나 이상의 parse query parse query 인스턴스를 결합하여 더 복잡한 결과를 얻을 수 있습니다 andquery // helper that is used by parse to add a constraint that all of passed in queries must match when using parse query and 1 let query1 = new parse query('profile'); 2 query1 greaterthan('friendcount', 10); 3 let query2 = new parse query('profile'); 4 query1 lessthan('friendcount', 50); 5 let query = new parse query('profile'); 6 query andquery(\[query1, query2]); 7 let queryresult = await query find(); 8 console log(queryresult); norquery //helper that is used by parse when using parse query nor 1 let query1 = new parse query('profile'); 2 query1 greaterthan('friendcount', 10); 3 let query2 = new parse query('profile'); 4 query1 lessthan('friendcount', 50); 5 let query = new parse query('profile'); 6 query norquery(\[query1, query2]); 7 let queryresult = await query find(); 8 console log(queryresult); orquery //helper that is used by parse to add a constraint that any of passed in queries must match when using parse query or 1 let query1 = new parse query('profile'); 2 query1 greaterthan('friendcount', 10); 3 let query2 = new parse query('profile'); 4 query1 lessthan('friendcount', 50); 5 let query = new parse query('profile'); 6 query orquery(\[query1, query2]); 7 let queryresult = await query find(); 8 console log(queryresult); and //compose a compound query that is the and of the passed queries 1 let query1 = new parse query('profile'); 2 query1 greaterthan('friendcount', 10); 3 let query2 = new parse query('profile'); 4 query1 lessthan('friendcount', 50); 5 let query = parse query and(query1, query2); 6 let queryresult = await query find(); 7 console log(queryresult); nor //compose a compound query that is the nor of the passed queries 1 let query1 = new parse query('profile'); 2 query1 greaterthan('friendcount', 10); 3 let query2 = new parse query('profile'); 4 query1 lessthan('friendcount', 50); 5 let query = parse query nor(query1, query2); 6 let queryresult = await query find(); 7 console log(queryresult); or //compose a compound query that is the or of the passed queries 1 let query1 = new parse query('profile'); 2 query1 greaterthan('friendcount', 10); 3 let query2 = new parse query('profile'); 4 query1 lessthan('friendcount', 50); 5 let query = parse query or(query1, query2); 6 let queryresult = await query find(); 7 console log(queryresult); 데이터베이스 관련 이 방법들은 데이터베이스 선호도 및 작업과 관련이 있습니다 aggregate // executes an aggregate query, retrieving objects over a set of input values please refer to mongodb documentation on aggregate for better understanding 1 let query = new parse query('profile'); 2 let queryresult = await query aggregate({ limit 5 }); 3 console log(queryresult); explain //investigates the query execution plan, related to mongodb explain operation 1 let query = new parse query('profile'); 2 query explain(true); 3 let queryresult = await query find(); 4 console log(queryresult); readpreference //swhen using a mongodb replica set, use this method to choose from which replica the objects will be retrieved the possible values are primary (default), primary preferred, secondary, secondary preferred, or nearest 1 let query = new parse query('profile'); 2 query readpreference(''primary''); 3 let queryresult = await query find(); 4 console log(queryresult); 로컬 데이터 저장소 이 방법은 쿼리의 소스를 선택하고 로컬 데이터 저장소를 사용할 수 있게 해줍니다 fromlocaldatastore // changes the source of this query to all pinned objects 1 // this should be set before using fromlocaldatastore 2 parse enablelocaldatastore(); 3 let query = new parse query('profile'); 4 query fromlocaldatastore(); 5 let queryresult = await query find(); 6 console log(queryresult); fromnetwork //changes the source of this query to your online server 1 let query = new parse query('profile'); 2 query fromnetwork(); 3 let queryresult = await query find(); 4 console log(queryresult); frompin //changes the source of this query to the default group of pinned objects 1 let query = new parse query('profile'); 2 query frompin(); 3 let queryresult = await query find(); 4 console log(queryresult); frompinwithname //changes the source of this query to a specific group of pinned objects 1 let query = new parse query('profile'); 2 query frompinwithname('pinnedobjects'); 3 let queryresult = await query find(); 4 console log(queryresult); json 세부사항 쿼리를 json으로 표현하고 검색할 수 있게 해주는 메서드입니다 tojson // returns a json representation of this query operations 1 let query = new parse query('profile'); 2 query greaterthan('friendcount', 10); 3 let queryjson = await query tojson(); 4 console log(queryjson); withjson //add a previously generated json representation of query operations to this query 1 let query = new parse query('profile'); 2 query greaterthan('friendcount', 10); 3 let queryjson = await query tojson(); 4 let query2 = new parse query('profile'); 5 query2 withjson(queryjson); 6 let queryresult = await query2 find(); 7 console log(queryresult); //static method to restore parse query by json representation, internally calling parse query withjson 1 let query = new parse query('profile'); 2 query greaterthan('friendcount', 10); 3 let queryjson = await query tojson(); 4 let query2 = parse query withjson('profile', queryjson); 5 let queryresult = await query2 find(); 6 console log(queryresult); 결론 이 가이드의 끝에서, 당신은 parse에서 모든 데이터 쿼리 메서드를 수행하는 방법을 배웠습니다 다음 가이드에서는 react native에서 복잡한 parse 쿼리에 대해 배울 것입니다