Video: Dab tsi yog qhov kev daws teeb meem hauv GraphQL?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Kev daws teeb meem yog ib phau ntawm muaj nuj nqi uas tsim cov lus teb rau a GraphQL nug. Hauv cov ntsiab lus yooj yim, a daws ua a GraphQL query handler. Txhua kev daws teeb meem hauv a GraphQL schema txais plaub qhov kev sib cav raws li muab hauv qab no − fieldName:(root, args, context, info) => { result }
Tsuas yog li ntawd, qhov kev daws teeb meem yog dab tsi?
Kev daws teeb meem txhais. Txhua daim teb ntawm txhua hom yog txhawb nqa los ntawm a muaj nuj nqi npe a daws . A daws yog a muaj nuj nqi uas daws tus nqi rau ib hom lossis teb hauv schema. Cov kev daws teeb meem tuaj yeem xa rov qab cov khoom lossis scalar xws li Strings, Numbers, Booleans, thiab lwm yam.
Ib sab saum toj no, GraphQL subscriptions siv rau dab tsi? Kev tso npe yog a GraphQL feature uas tso cai rau lub server xa cov ntaub ntawv rau nws cov neeg siv khoom thaum muaj xwm txheej tshwj xeeb tshwm sim. Kev tso npe feem ntau yog siv nrog WebSockets. Hauv qhov teeb tsa ntawd, tus neeg rau zaub mov tswj kev sib txuas ruaj khov rau nws cov neeg siv khoom.
Kuj kom paub, GraphQL cov neeg daws teeb meem ua haujlwm li cas?
Cov kev daws teeb meem yog tus yuam sij rau daim duab no. Txhua daws sawv cev rau ib daim teb, thiab ua tau siv rau nqa cov ntaub ntawv los ntawm txhua qhov chaw koj muaj. Cov kev daws teeb meem muab cov lus qhia rau tig a GraphQL ua haujlwm rau hauv cov ntaub ntawv. Cov kev daws teeb meem yog koom ua ib qho rau ib mapping rau cov teb hauv a GraphQL schema.
GraphQL ntsiab lus yog dab tsi?
Hauv GraphQL , a ntsiab lus yog ib qho khoom sib koom los ntawm txhua tus neeg daws teeb meem ntawm ib qho kev ua tiav. Nws muaj txiaj ntsig zoo rau kev khaws cov ntaub ntawv xws li kev lees paub cov ntaub ntawv, cov neeg siv tam sim no, kev sib txuas ntawm cov ntaub ntawv, cov ntaub ntawv thiab lwm yam uas koj xav tau rau kev khiav koj lub lag luam logic.
Pom zoo:
Cov teeb meem dab tsi yog tus qauv qauv daws teeb meem?
Cov qauv zoo yog siv los daws cov teeb meem uas tej zaum yuav (los yog pom tias lawv yuav) raug coj los siv lossis daws los ntawm cov tswv yim sib txawv thiab uas muaj cov lus qhia meej meej rau cov xwm txheej zoo li no
Kev daws teeb meem hauv kev paub txog kev puas siab puas ntsws yog dab tsi?
Hauv kev paub txog kev puas siab puas ntsws, lo lus daws teeb meem yog hais txog cov txheej txheem kev puas siab puas ntsws uas tib neeg mus nrhiav pom, txheeb xyuas, thiab daws teeb meem. Ua ntej kev daws teeb meem tuaj yeem tshwm sim, nws yog ib qho tseem ceeb kom nkag siab qhov tseeb ntawm qhov teeb meem nws tus kheej
Dab tsi yog qee qhov teeb meem kev coj ncaj ncees thiab teeb meem cuam tshuam nrog khoos phis tawj thiab kev sib txuas lus hluav taws xob?
Qee qhov teeb meem no yog qhov tshiab (xws li luam theej duab software), thaum lwm tus yog cov tshiab version ntawm cov teeb meem qub txog qhov raug thiab tsis ncaj ncees, kev ncaj ncees, kev ncaj ncees, lub luag haujlwm, tsis pub lwm tus paub, kev ntseeg siab, kev lav phib xaub, thiab kev ncaj ncees. Cov neeg siv ntsib qee qhov teeb meem no thaum cov kws tshaj lij hauv computer ntsib tag nrho lawv
Dab tsi yog qhov teeb meem phem tshaj plaws thiab qhov teeb meem nruab nrab nyuaj ntawm binary nrhiav ntoo?
Binary search tree Algorithm Qhov nruab nrab qhov phem tshaj qhov chaw O(n) O(n) Nrhiav O(log n) O(n) Ntxig O(log n) O(n) Rho tawm O(log n) O(n)
Dab tsi yog qhov xav tau rau cov chav kawm paub daws teeb meem thiab kev paub daws teeb meem?
Cov chav kawm Abstract. Abstract (uas Java txhawb nrog cov ntsiab lus paub daws teeb meem) txhais tau hais tias chav kawm lossis txoj hauv kev lossis teb lossis txhua yam tsis tuaj yeem ua tam sim (uas yog, tsim) qhov twg nws tau txhais. Lwm yam khoom yuav tsum instantiate cov khoom nyob rau hauv nqe lus nug. Yog tias koj ua ib chav kawm abstract, koj tsis tuaj yeem instantiate ib yam khoom los ntawm nws