Video: Kuv yuav ua li cas thiaj tsim tau ib hom complex hauv Entity Framework?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
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, dab tsi yog hom complex hauv Entity Framework?
lus-api. cov ntaub ntawv-annotations. Cov Hom complex yog cov khoom tsis-scalar ntawm yam hom uas ua kom cov khoom scalar tau teeb tsa hauv cov chaw . Hom complex tsis muaj cov yuam sij thiab yog li tsis tuaj yeem nyob ntawm nws tus kheej. Nws tuaj yeem tsuas muaj nyob raws li cov khoom ntawm yam hom los yog lwm yam hom complex.
Kuv yuav ntxiv cov txheej txheem khaws cia rau hauv cov ntaub ntawv.edmx li cas? Teb
- Txoj nyem rau ntawm qhov chaw lossis qhov chaw khoob hauv qhov rais tsim.
- Xaiv Ntxiv>> Muaj nuj nqi Import…
- Ntaus lub Function Ntshuam Lub Npe raws li koj nyiam, xaiv lub npe Cov txheej txheem khaws cia hauv cov npe teev tseg, thiab teeb tsa hom rov qab los ntawm txoj haujlwm no.
- Ces koj hu rau txoj kev zoo li no: context.myStoredProcedure();
Ua kom pom qhov no, Scalar cov cuab yeej hauv Entity Framework yog dab tsi?
Scalar khoom yog khoom uas muaj nuj nqis tiag muaj nyob rau hauv qhov chaw . A vaj tse ntawm ib qhov chaw uas maps rau ib qho chaw hauv cov qauv cia. E.g. Tub kawm qhov chaw muaj scalar zog e.g. StudentId, StudentName. Cov no suav nrog Cov Tub Kawm Ntawv cov kab lus.
Muaj pes tsawg hom complex muaj?
Nws txhais tau tias ob hom ntawm cov zauv, tiag thiab kev xav, ua ke ua ib complex , ib yam li lub tsev complex (cov tsev koom ua ke).
Pom zoo:
Kuv yuav ua li cas thiaj tsim tau daim ntawv sau tau hauv OneNote?
Ntawm Insert tab, xaiv Forms. Lub vaj huam sib luag Formsfor OneNote yuav qhib thiab ntsaws rau sab xis ntawm koj phau ntawv OneNote, nrog rau cov npe ntawm txhua daim ntawv thiab cov lus nug uas koj tau tsim. Nrhiav daim ntawv lossis cov lus nug uas koj xav nkag rau hauv koj nplooj ntawv OneNote hauv qab Kuv cov ntawv, thiab tom qab ntawd xaiv Insert
Kuv yuav ua li cas thiaj tsim tau ib txoj kev npaj hauv pem teb hauv Visio?
Xaiv Cov Ntaub Ntawv> Tshiab. Xaiv Templates > Maps thiab Pem Teb Plans. Xaiv cov phiaj xwm hauv pem teb koj xav tau thiab xaiv Tsim. Xaiv Cov Phab Ntsa, Qhov Rooj, thiab Windows stencil. Luag ib chav tsev rau ntawm nplooj ntawv kos duab. Txhawm rau hloov kho chav tsev, luag cov tswj tuav. Luag cov qhov rooj thiab qhov rais mus rau ntawm phab ntsa ntawm chav tsev
Kuv yuav ua li cas thiaj tsim tau lub database ua ntej hauv Entity Framework?
Entity Framework - Database First Approach Kauj Ruam 2 - Txhawm rau tsim tus qauv, thawj txoj cai-nias ntawm koj qhov project console hauv kev daws teeb meem explorer thiab xaiv Ntxiv → Cov Khoom Tshiab… Kauj Ruam 4 - Nyem Ntxiv khawm uas yuav tso tawm Cov Ntaub Ntawv Cov Qauv Wizard dialog. Kauj ruam 5 - Xaiv EF Designer los ntawm cov ntaub ntawv thiab nias lub pob Ntxiv. Kauj ruam 6 - Xaiv cov ntaub ntawv uas twb muaj lawm thiab nyem Next
Kuv yuav ua li cas thiaj li tau txais kuv HP tawm ntawm hom kev tsim khoom?
Pib dua koj lub cuab yeej. Nias qhov tseem ceeb tam sim ntawd thaum koj pom cov lus hauv qab no “= System Setup”. Nias cov yuam sij thaum koj lub computer qhib qhov System Setup screen. Qhov kev txiav txim no tua cov kev tsim khoom ntawm koj lub rooj tsav xwm system
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