Cov txheej txheem:
Video: Kuv yuav siv Entity Framework li cas?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
- Yam yuavtsum tau kawm uantej. Visual Studio 2017.
- Tsim ib qho MVC web app. Qhib Visual Studio thiab tsim ib qhov project C# web siv ASP. NET Web Application (.
- Teem lub site style.
- Nruab Lub Koom Haum Ua Haujlwm 6.
- Tsim cov ntaub ntawv qauv.
- Tsim cov ntsiab lus database.
- Pib pib DB nrog cov ntaub ntawv xeem.
- Teeb tsa EF 6 rau siv LocalDB.
Ib yam li ntawd, Entity Framework ua haujlwm li cas?
Cov Lub Koom Haum Ua Haujlwm siv cov ntaub ntawv nyob rau hauv tus qauv thiab daim ntawv qhia cov ntaub ntawv los txhais cov khoom queries tawm tsam qhov chaw hom sawv cev hauv cov qauv kev xav rau hauv cov ntaub ntawv cov lus nug tshwj xeeb. Cov ntsiab lus nug yog materialized rau hauv cov khoom uas cov Lub Koom Haum Ua Haujlwm tswj. Yog xav paub ntxiv, saib LINQ rau Cov koom haum.
Ib sab saum toj no, 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.
Ib yam li ntawd, ib tug yuav nug, qhov twg yog Qhov Chaw Pabcuam Siv?
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.
Kuv yuav teeb tsa lub koom haum li cas?
Txhim kho Entity Framework 6 rau hauv koj qhov Project
- Qhib Visual Studio 2012 lossis 2015.
- Xaiv MVC nyob rau hauv template qhov rais thiab hloov authentication rau No Authentication thiab nias OK.
- Qhib Solution Explorer.
- Hauv NuGet Package Manager, nrhiav rau Qhov Chaw Ua Haujlwm thiab nyem rau ntawm Nruab khawm rau nruab nws.
- Lub dialog box yuav tshwm sim nug koj qhov kev pom zoo rau kev hloov.
Pom zoo:
Kuv yuav ntxig ib lub rooj rau hauv Entity Framework li cas?
VIDEO Tom qab ntawd, kuv yuav ntxiv ib lub rooj tshiab hauv Entity Framework li cas? Koj ua tau ntxiv qhov no rooj mus rau ASP.NET MVC qhov project los ntawm kev ua raws li cov kauj ruam no: Txoj cai-nias ntawm App_Data folder hauv Solution Explorer qhov rai thiab xaiv cov ntawv qhia zaub mov Ntxiv , Tshiab Yam khoom.
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
Yuav ua li cas koj tsim ib tug database siv code thawj txoj hauv kev hauv Entity Framework?
Tsim Cov Ntaub Ntawv Tshiab Siv Cov Cai Ua Ntej Hauv Cov Txheej Txheem Txheej Txheem Kauj Ruam 1 - Tsim Windows daim ntawv project. Kauj Ruam 2 - Ntxiv qhov chaw ua haujlwm rau hauv qhov project tsim tshiab siv NuGet pob. Kauj ruam 3 - Tsim qauv rau hauv qhov project. Kauj ruam 4 - Tsim cov ntsiab lus hauv chav kawm rau hauv qhov project. Kauj Ruam 5 - Tshaj tawm ntaus DbSet rau txhua chav kawm ntawm tus qauv. Kauj Ruam 6 - Tsim ntu kev nkag
Kuv yuav ntxiv ib lub rooj tshiab rau Entity Framework li cas?
2 Teb. Qhib cov ntaub ntawv edmx, nyem rau txhua qhov chaw hauv lub modal thiab xaiv 'Update Model from Database' thiab ua raws li cov lus qhia thiab xaiv cov rooj xav tau thiab SPs. Qee zaum txawm tias tom qab ua raws li cov kauj ruam no, koj tus qauv yuav tsis hloov kho, kaw Visual Studio thiab rov pib dua
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