Video: Qhov zoo API hauv MVC yog dab tsi?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Lub Koom Haum Ua Haujlwm API zoo yog siv los teeb tsa cov chav kawm sau los hla cov rooj sib txoos. EF API zoo yog nyob ntawm a API zoo tsim qauv (a.k.a Paub meej Interface) qhov twg qhov tshwm sim yog formulated los ntawm txoj kev chaining. Koj tuaj yeem siv cov ntaub ntawv Annotation cwj pwm thiab API zoo tib lub sijhawm.
Ib yam li ntawd, koj tuaj yeem nug, OnModelCreating yog dab tsi?
Kev teeb tsa raug siv los ntawm ntau txoj hauv kev nthuav tawm los ntawm Microsoft. Chav kawm DbContext muaj ib txoj kev hu ua OnModelCreating uas siv ib qho piv txwv ntawm ModelBuilder ua qhov parameter. Txoj kev no yog hu los ntawm lub moj khaum thaum koj cov ntsiab lus tau tsim thawj zaug los tsim cov qauv thiab nws cov duab kos hauv nco.
Dab tsi yog daim ntawv qhia hauv Entity Framework? Lub Koom Haum Ua Haujlwm . Nws yog ib qho cuab yeej los nkag rau hauv database. Qhov tseeb dua, nws tau muab cais ua Qhov Object / Relational Mapper (ORM) uas txhais tau tias nws qhia cov ntaub ntawv hauv cov ntaub ntawv sib txheeb rau hauv cov khoom ntawm peb daim ntawv thov. Ua ntej.
Ua kom pom qhov no, ModelBuilder yog dab tsi?
Rov qab ib yam khoom uas tuaj yeem siv los kho qhov muab qhov chaw ntaus hauv tus qauv. Yog ib qhov chaw hom nrog lub npe muab tsis yog ib feem ntawm cov qauv, ib qho tshiab qhov chaw hom uas tsis muaj qhov sib xws CLR hom yuav raug ntxiv rau tus qauv.
DbContext yog dab tsi?
DbContext yog chav kawm tseem ceeb hauv Entity Framework API. Nws yog tus choj ntawm koj qhov chaw sau lossis chav kawm thiab cov ntaub ntawv. DbContext yog thawj chav kawm uas yog lub luag haujlwm rau kev cuam tshuam nrog database.
Pom zoo:
Dab tsi yog qhov piv txwv ntawm qhov zoo nrog rau qhov zoo network sab nraud cuam tshuam?
Cov piv txwv classic yog xov tooj, qhov twg ntau tus neeg siv nce tus nqi rau txhua tus. Qhov zoo sab nraud yog tsim thaum lub xov tooj tau yuav yam tsis muaj nws tus tswv xav tsim kom muaj txiaj ntsig rau lwm tus neeg siv, tab sis ua li ntawd txawm tias
Dab tsi yog qhov txawv ntawm kev sib raug zoo unary kev sib raug zoo binary thiab kev sib raug zoo ternary?
Kev sib raug zoo tsis sib xws yog thaum ob tus neeg koom hauv kev sib raug zoo yog tib lub koom haum. Piv txwv li: Cov ncauj lus yuav yog qhov yuav tsum tau ua ua ntej rau lwm yam kev kawm. Kev sib raug zoo ternary yog thaum peb lub koom haum koom nrog kev sib raug zoo
Dab tsi yog sparse kem Dab tsi yog qhov zoo thiab qhov tsis zoo?
Koj poob 4 bytes tsis yog ib zaug ib kab; tab sis rau txhua lub cell hauv kab uas tsis yog null. Qhov zoo ntawm SPARSE kem yog: Qhov tsis zoo ntawm SPARSE kem yog: SPARSE kem tsis tuaj yeem siv rau ntawm cov ntawv, ntext, duab, timestamp, geometry, geography lossis cov neeg siv cov ntaub ntawv teev tseg
Dab tsi yog qhov zoo thiab qhov tsis zoo ntawm kev tshaj xov xwm hauv kev kho mob?
Thaum siv ceev faj, kev tshaj xov xwm tuaj yeem muab cov txiaj ntsig zoo xws li kev sib tham ua haujlwm, kev kawm kho mob, thiab cov neeg mob kev noj qab haus huv. Txawm li cas los xij, thaum siv tsis zoo, kev tshaj xov xwm hauv social media muaj qhov tsis zoo xws li kev ua txhaum ntawm cov neeg mob tsis pub leej twg paub thiab tsis pub leej twg paub thiab tuaj yeem ua rau muaj kev cuam tshuam loj heev
Dab tsi yog qhov zoo sib xws thiab qhov txawv ntawm relays thiab PLC yog dab tsi?
Relays yog electro-mechanical keyboards uas muaj coil thiab ob hom kev sib cuag uas tsis yog NO & NC. Tab sis Programmable Logic Controller, PLC yog lub khoos phis tawj me uas tuaj yeem txiav txim siab raws li qhov kev zov me nyuam thiab nws cov tswv yim & tso tawm