Video: Entity Framework yog dab tsi?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Lub Koom Haum Ua Haujlwm yog qhov chaw qhib ORM lub moj khaum rau. NET cov ntawv thov txhawb nqa 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.
Tib neeg kuj nug, Entity Framework ua dab tsi?
Entity Framework yog qhov qhib-qhov ORM moj khaum rau. NET cov ntawv thov txhawb nqa los ntawm Microsoft. Nws enables developers ua hauj lwm nrog cov ntaub ntawv siv cov khoom ntawm sau npe cov chav kawm tshwj xeeb yam tsis tau tsom mus rau hauv qab database cov ntxhuav thiab kab ke uas cov ntaub ntawv no khaws cia.
Ib tug kuj yuav nug, dab tsi yog qhov txiaj ntsig ntawm Entity Framework? Qhov zoo ntawm Entity Framework Nws muab nws pib generated code. Nws txo lub sijhawm txhim kho. Nws txo tus nqi tsim kho. Nws enables developers mus visually tsim qauv thiab daim ntawv qhia ntawm database.
Tsis tas li ntawd, Entity Framework yog dab tsi thiab nws ua haujlwm li cas?
Cov Lub Koom Haum Ua Haujlwm yog cov txheej txheem thev naus laus zis hauv ADO. NET uas txhawb kev txhim kho cov ntaub ntawv-oriented software applications. Lawv yuav tsum ua tus qauv cov koom haum , kev sib raug zoo, thiab cov laj thawj ntawm cov teeb meem kev lag luam uas lawv daws tau, thiab lawv yuav tsum tau ua ua haujlwm nrog cov ntaub ntawv cav siv los khaws thiab khaws cov ntaub ntawv.
Dab tsi yog Qhov Txheej Txheem Txheej Txheem hauv C #?
ADO. NET Lub Koom Haum Ua Haujlwm yog Object/Relational Map (ORM) lub moj khaum uas enables developers ua hauj lwm nrog relational database. Siv cov Lub Koom Haum Ua Haujlwm , cov neeg tsim tawm teeb meem cov lus nug siv LINQ, tom qab ntawd muab thiab tswj cov ntaub ntawv raws li cov khoom siv tau zoo siv C# los yog VB. Net.
Pom zoo:
Dab tsi yog daim ntawv qhia hauv Entity Framework?
Entity Framework. 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
Dab tsi yog hom complex hauv Entity Framework?
Cov hom Complex yog cov khoom tsis-scalar ntawm qhov chaw hom uas ua kom cov khoom scalar raug teeb tsa hauv cov chaw. Nws tsuas tuaj yeem muaj nyob ua cov khoom ntawm hom chaw lossis lwm hom complex. Nws tsis tuaj yeem koom nrog cov koom haum thiab tsis tuaj yeem muaj cov cuab yeej navigation. Complex hom khoom tsis tuaj yeem yog null
Dab tsi yog qhov qauv ntawm qhov chaw cia khoom nyob hauv Entity Framework?
Generic Repository Pattern C# Tsim cov chav kawm repository rau txhua qhov chaw tuaj yeem ua rau ntau tus lej rov ua dua. Generic repository qauv yog ib txoj hauv kev los txo qhov kev rov ua dua no thiab muaj ib lub hauv paus repository ua haujlwm rau txhua hom ntaub ntawv
Dab tsi yog concurrency hauv Entity Framework?
Concurrency Management nyob rau hauv Entity Framework Core. Kev tsis sib haum xeeb tshwm sim thaum ib tus neeg siv tau txais ib qho chaw cov ntaub ntawv txhawm rau hloov kho nws, thiab tom qab ntawd lwm tus neeg siv hloov kho tib lub koom haum cov ntaub ntawv ua ntej thawj tus neeg siv hloov pauv tau sau rau hauv cov ntaub ntawv
Qhov tseeb version ntawm Entity Framework yog dab tsi?
EF 6 Hauv qhov no, qhov tseeb version ntawm Entity Framework Core yog dab tsi? Nthuav lub Ncej Core (EF Core ) yog qhov tseeb version ntawm Lub Koom Haum Ua Haujlwm los ntawm Microsoft. Nws tau raug tsim los ua lub teeb yuag, txuas ntxiv thiab txhawb nqa hla kev txhim kho platform raws li ib feem ntawm Microsoft's.