Video: Dab tsi yog hom complex hauv Entity Framework?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Cov Hom complex yog cov khoom tsis-scalar ntawm yam hom uas ua kom cov khoom scalar tau teeb tsa hauv cov koom haum . Nws tuaj yeem tsuas muaj nyob raws li cov khoom ntawm yam hom los yog lwm yam hom complex . Nws tsis tuaj yeem koom nrog cov koom haum thiab tsis tuaj yeem muaj cov cuab yeej navigation. Hom complex khoom tsis tuaj yeem yog null.
Hais txog qhov no, kuv yuav ua li cas thiaj tsim tau ib hom kev nyuaj hauv Entity Framework?
Right-click ib qhov chaw , taw tes rau Ntxiv Tshiab, thiab xaiv nyuaj Khoom. A hom complex cov cuab yeej nrog lub npe default yog ntxiv rau qhov chaw . Lub neej ntawd hom (xaiv los ntawm cov uas twb muaj lawm hom complex ) yog muab rau cov cuab yeej. Muab qhov xav tau hom mus rau cov khoom nyob rau hauv lub qhov rais Properties.
Tsis tas li ntawd, tus qauv qauv yog dab tsi? Cov Qhov chaw Cov ntaub ntawv Qauv (EDM) yog ib qho txuas ntxiv ntawm cov Qhov chaw - Kev sib raug zoo qauv uas qhia txog lub tswvyim qauv ntawm cov ntaub ntawv siv ntau yam qauv qauv. Nws kuj yog hais txog cov txheej txheem uas piav txog cov qauv ntaub ntawv, tsis hais nws daim ntawv khaws cia.
Raws li txoj cai, muaj pes tsawg hom Entity Framework muaj?
Muaj ob hom ntawm cov koom haum hauv Lub Koom Haum Ua Haujlwm : POCO Cov koom haum thiab Dynamic Proxy Cov koom haum.
Entity Framework yog dab tsi hauv. NET nrog piv txwv?
Lub Koom Haum Ua Haujlwm yog qhov chaw qhib ORM lub moj khaum rau. NET cov ntawv thov txhawb los ntawm Microsoft. Nws ua rau cov neeg tsim khoom ua haujlwm nrog cov ntaub ntawv siv cov khoom ntawm cov chav kawm tshwj xeeb yam tsis tau tsom mus rau cov lus hauv qab database thiab txhua kab uas cov ntaub ntawv no khaws cia.
Pom zoo:
Lub hom phiaj ntawm hom lus hom lus yog dab tsi?
Hom Lus Specification. Ib Hom Lus Qhia Tshwj Xeeb (CLS) yog ib daim ntawv uas hais tias yuav ua li cas cov khoos phis tawj tuaj yeem hloov mus rau hauv Cov Lus Qhia Nruab Nrab (CIL) code. Thaum ntau hom lus siv tib bytecode, qhov sib txawv ntawm qhov kev pab cuam tuaj yeem sau ua hom lus sib txawv
Dab tsi yog lub hom phiaj ntawm delimiters nyob rau hauv cov ntawv sau npe ob hom ntawv cov ntaub ntawv delimiters?
Cov ntaub ntawv delimited yog cov ntawv nyeem siv los khaws cov ntaub ntawv, uas txhua kab sawv cev rau ib phau ntawv, tuam txhab, lossis lwm yam, thiab txhua kab muaj cov teb sib cais los ntawm tus lej
Kuv yuav ua li cas thiaj tsim tau ib hom complex hauv Entity Framework?
Right-click ib qhov chaw, taw tes rau Ntxiv Tshiab, thiab xaiv Complex Property. Ib hom khoom vaj khoom tsev nrog lub npe default yog ntxiv rau qhov chaw. Ib hom default (xaiv los ntawm cov hom complex uas twb muaj lawm) raug muab rau cov cuab yeej. Muab cov yam xav tau rau cov cuab yeej hauv lub qhov rais Properties
Dab tsi yog hom complex hauv OData?
Cov hom complex muaj xws li cov npe ntawm cov khoom uas tsis muaj qhov tseem ceeb, thiab tuaj yeem tsuas yog muaj raws li cov khoom ntawm ib lub koom haum lossis cov nqi ib ntus. Koj tuaj yeem siv hom complex rau pab pawg teb ua ke yam tsis tau nthuav tawm lawv li OData qhov chaw ywj pheej
Tus neeg siv hom thiab kernel hom yog dab tsi hauv OS?
Lub kaw lus yog nyob rau hauv cov neeg siv hom thaum lub operating system khiav ib tug neeg siv daim ntawv thov xws li tuav cov ntawv nyeem. Kev hloov pauv ntawm hom neeg siv mus rau hom ntsiav tshwm sim thaum daim ntawv thov thov kev pab ntawm kev khiav hauj lwm los yog kev cuam tshuam lossis kev hu xov tooj tshwm sim. Lub hom me ntsis yog teem rau 1 hauv hom neeg siv