[postgreSQL] Data Search - Sequelize Op
1. Data Search logic
작성한 data(list)를 탐색하기 위한 구조를 생성한다.
data search logic flow는 다음과 같다.
- list 내 data를 찾아보는 검색화면을 구성한다.
- search 조건에 맞는 list를 찾은 후, table 항목들을 보여주는 화면에 선별된 list만 나타내어 준다(All tables 화면)
- ※ 1차적으로 technologies fields에 대한 조건을 선별하고, 해당 list를 보여주는 logic을 구현하도록 한다.
1-1. template(handlebars)의 action 설정
data 전달 통로를 구성해야 한다.
추가적인 화면이동없이, 특정 url에서 data를 전달받고 그 후 화면전환이 일어나는 구조를 구성한다.
<form action="/tables/search" class="search-form">
<i class="fas fa-search"></i>
<input type="search" name="term" placeholder="Javascript, PHP, Rails, etc...">
<input type="submit" value="Search">
</form>
따라서 Home.expresshandlebars의 body 부분인 index.handlbears에서 사용자가 input값을 입력하고 제출하는 과정이 이루어지는 tag에 action url을 설정하도록 한다.
위와 같이 설정해준 url을 통해 data가 전달 및 저장된다.
1-2. action을 통해 data 전달 및 seacrh
action에서 설정해준 url에서 data를 req 인자를 통해 받는다.
//for searching data
router.get('/search', (req,res) => {
//console.log('req_ \n',req)
//console.log('req.query_ \n', req.query)
//toLowerCase()
let {term} = req.query
term = term.toLowerCase()
//console.log('term_ \n', term)
Model.findAll({ where : {technologies: {[Op.like]: '%'+ term +'%'}}})
.then(list => res.render('list', {
list: list})
)
.catch(err=>console.error(err))
})
위와 같이 router.get('/search')를 통해 data를 req 인자를 통해 전달받고, server side에서 req 인자의 query, term으로 입력 값을 확보한다.
※ 여기까지의 logic이 사용자가 검색값을 입력하기까지이다.
1-3. 화면전환, 선별 data 대상으로 화면에 구현하기
findAll(), sequelize Op 연산자 활용
Model.findAll({ where : {technologies: {[Op.like]: '%'+ term +'%'}}})
.then(list => res.render('list', {
list: list})
)
.catch(err=>console.error(err))
입력받은 검색값을 활용하여, technologies fields에 해당 검색값과 매칭한 후 data를 선별하는 logic을 구성한다.
- Model.findAll() 함수 사용
- SQL query와 같이 where절을 통해 data 선별을 진행한다.
- Op.like를 사용하면 입력받은 문자열을 포함하는지 해당 영역 내에서 비교 진행한다.
- 선별한 data에 대한 인자(list)를 받고, 그대로 template(handlebars)에 전달한다.
1-4. (참조) Op.like 연산자
기본적으로 where을 통해 data 선별을 시작, sequlize 연산자를 활용해서 다양한 조건의 입력값들을 확보할 수 있다.
findAll({
where : //조건
{technologies : //조건영역
{ [Op.like] : // Op연산자(세부검색조건, 배열)
'%' + term '%' //세부검색조건 할당(%는 완전일치가 아닌 포함일치, 앞뒤로 할당)
}
}
})
이처럼 sequelize Op 연산자는 data search에 매우 유용하게 활용할 수 있으므로, 공식문서를 참조해서 이용할 수 있도록 한다.
1-5. 화면 구현 확인
화면 확인
- data search logic이 정상적으로 작동하는지 확인한다.
2. (참조) 유의해야할 문법
routing 시점에서 req인자와 res인자 순서대로 작성해야 하며, 서로 바뀌면 안된다.
router.get('/search', (req,res) => {
3. (참조) router.get 개념
router.get은 단순히 url 요청에 의한 화면을 구현하는 역할뿐만 아니라
action 등 특정 이벤트와 연결된 data를 req 인자를 통해 받아올 수 있도록 한다.
<form action="/tables/search" class="search-form">
위 template에서 form tag를 통해 연결된 action은, 해당 url을 통해 data를 전달받을 수 있도록 그 구조가 구성되었다.
//for searching data
router.get('/search', (req,res) => {
console.log('req_ \n',req)
console.log('req.query_ \n', req.query)
//toLowerCase()n
let {term} = req.query
이후 router에서 action을 통해 연결한 data는 req 인자를 통해 받을 수 있다.
4. (참조) action과 연결된 routing 및 이를 통해 전달받은 req인자
req 인자는 여러 객체 및 정보들이 저장되어 있고, data가 전달되는 시점에서 전달 경로에 맞는 객체에 저장된다.
req 인자는 아래와 같이 매우 많은 정보들이 저장되어 있다.
req_
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pause: [Function: onSocketPause]
},
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[Symbol(IncomingMessage)]: [Function: IncomingMessage],
[Symbol(ServerResponse)]: [Function: ServerResponse],
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[Symbol(async_id_symbol)]: 8
},
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maxHeaderSize: undefined,
insecureHTTPParser: undefined,
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_connectionKey: '6::::5000',
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'0': [Function: bound setRequestTimeout],
'1': [Function: parserOnHeaders],
'2': [Function: parserOnHeadersComplete],
'3': [Function: parserOnBody],
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'5': [Function: bound onParserExecute],
'6': [Function: bound onParserTimeout],
_headers: [],
_url: '',
socket: [Circular *1],
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outgoing: null,
maxHeaderPairs: 2000,
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onIncoming: [Function: bound parserOnIncoming],
[Symbol(resource_symbol)]: [HTTPServerAsyncResource]
},
on: [Function: socketListenerWrap],
addListener: [Function: socketListenerWrap],
prependListener: [Function: socketListenerWrap],
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writable: true,
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},
httpVersionMajor: 1,
httpVersionMinor: 1,
httpVersion: '1.1',
complete: true,
headers: {
host: 'localhost:5000',
connection: 'keep-alive',
'sec-ch-ua': '"Microsoft Edge";v="93", " Not;A Brand";v="99", "Chromium";v="93"',
'sec-ch-ua-mobile': '?0',
'sec-ch-ua-platform': '"Windows"',
'upgrade-insecure-requests': '1',
'user-agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/93.0.4577.63 Safari/537.36 Edg/93.0.961.38',
accept: 'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9',
'sec-fetch-site': 'same-origin',
'sec-fetch-mode': 'navigate',
'sec-fetch-user': '?1',
'sec-fetch-dest': 'document',
referer: 'http://localhost:5000/',
'accept-encoding': 'gzip, deflate, br',
'accept-language': 'ko,en;q=0.9,en-US;q=0.8'
},
rawHeaders: [
'Host',
'localhost:5000',
'Connection',
'keep-alive',
'sec-ch-ua',
'"Microsoft Edge";v="93", " Not;A Brand";v="99", "Chromium";v="93"',
'sec-ch-ua-mobile',
'?0',
'sec-ch-ua-platform',
'"Windows"',
'Upgrade-Insecure-Requests',
'1',
'User-Agent',
'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/93.0.4577.63 Safari/537.36 Edg/93.0.961.38',
'Accept',
'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9',
'Sec-Fetch-Site',
'same-origin',
'Sec-Fetch-Mode',
'navigate',
'Sec-Fetch-User',
'?1',
'Sec-Fetch-Dest',
'document',
'Referer',
'http://localhost:5000/',
'Accept-Encoding',
'gzip, deflate, br',
'Accept-Language',
'ko,en;q=0.9,en-US;q=0.8'
],
trailers: {},
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upgrade: false,
url: '/search?term=PHP',
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},
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},
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next: [Function: next],
baseUrl: '/tables',
originalUrl: '/tables/search?term=PHP',
_parsedUrl: Url {
protocol: null,
slashes: null,
auth: null,
host: null,
port: null,
hostname: null,
hash: null,
search: '?term=PHP',
query: 'term=PHP',
pathname: '/search',
path: '/search?term=PHP',
href: '/search?term=PHP',
_raw: '/search?term=PHP'
},
params: {},
**************query: { term: 'PHP' },**********(req.query)
res: <ref *3> ServerResponse {
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sendDate: true,
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_removedContLen: false,
_removedTE: false,
_contentLength: null,
_hasBody: true,
_trailer: '',
finished: false,
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socket: <ref *1> Socket {
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_hadError: false,
_parent: null,
_host: null,
_readableState: [ReadableState],
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_maxListeners: undefined,
_writableState: [WritableState],
allowHalfOpen: true,
_sockname: null,
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_pendingEncoding: '',
server: [Server],
_server: [Server],
parser: [HTTPParser],
on: [Function: socketListenerWrap],
addListener: [Function: socketListenerWrap],
prependListener: [Function: socketListenerWrap],
_paused: false,
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timeout: 0,
[Symbol(async_id_symbol)]: 48,
[Symbol(kHandle)]: [TCP],
[Symbol(kSetNoDelay)]: false,
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[Symbol(timeout)]: Timeout {
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_idleNext: null,
_idleStart: 6036,
_onTimeout: null,
_timerArgs: undefined,
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[Symbol(triggerId)]: 78
},
[Symbol(kBuffer)]: null,
[Symbol(kBufferCb)]: null,
[Symbol(kBufferGen)]: null,
[Symbol(kCapture)]: false,
[Symbol(kBytesRead)]: 0,
[Symbol(kBytesWritten)]: 0,
[Symbol(RequestTimeout)]: undefined
},
_header: null,
_keepAliveTimeout: 5000,
_onPendingData: [Function: bound updateOutgoingData],
_sent100: false,
_expect_continue: false,
req: [Circular *2],
locals: [Object: null prototype] {},
[Symbol(kCapture)]: false,
[Symbol(kNeedDrain)]: false,
[Symbol(corked)]: 0,
[Symbol(kOutHeaders)]: [Object: null prototype] { 'x-powered-by': [Array] }
},
body: {},
_parsedOriginalUrl: Url {
protocol: null,
slashes: null,
auth: null,
host: null,
port: null,
hostname: null,
hash: null,
search: '?term=PHP',
query: 'term=PHP',
pathname: '/tables/search',
path: '/tables/search?term=PHP',
href: '/tables/search?term=PHP',
_raw: '/tables/search?term=PHP'
},
route: Route { path: '/search', stack: [ [Layer] ], methods: { get: true } },
[Symbol(kCapture)]: false,
[Symbol(RequestTimeout)]: undefined
}
req.query
req.query_
{ term: 'PHP' }
여기서 query 객체의 term 정보에 action을 통해 전달된 문자열이 저장되어 있음을 알 수 있다.
따라서 term 정보를 사용할 때 비구조화를 하여 사용하면된다.
※ 여기서 query, term 변수는 req인자에 default로 구성되어있는 구조적인 변수이며, 변수가 undefined로 나타날 경우 위와 같이 인자를 비교하면서 찾는 것도 필요하다.
5. 참조링크
sequelize 공식문서
https://sequelize.org/v5/manual/querying.html
sequelize Op 연산자
https://medium.com/humanscape-tech/sequelize-part-7-querying%EC%97%90-%EB%8C%80%ED%95%98%EC%97%AC-7655306c1e32
https://www.codegrepper.com/code-examples/javascript/op+in+sequelize
form action
http://tcpschool.com/html-tag-attrs/form-action
LIKE operator
https://lifetutorial.tistory.com/24
Author And Source
이 문제에 관하여([postgreSQL] Data Search - Sequelize Op), 우리는 이곳에서 더 많은 자료를 발견하고 링크를 클릭하여 보았다 https://velog.io/@gyrbs22/postgreSQL-Data-Search저자 귀속: 원작자 정보가 원작자 URL에 포함되어 있으며 저작권은 원작자 소유입니다.
우수한 개발자 콘텐츠 발견에 전념 (Collection and Share based on the CC Protocol.)