Cov txheej txheem:
Video: Kev tsiv teb tsaws chaws yog dab tsi?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Server tswj cov ntaub ntawv loj loj. Code migration kuj pab txhim kho kev ua tau zoo los ntawm kev siv kev sib luag. Code migration nyob rau hauv qhov dav tshaj plaws deals nrog tsiv cov kev pab cuam ntawm cov cav tov, nrog rau lub hom phiaj kom muaj cov kev pab cuam yuav raug tua ntawm lub hom phiaj. Hauv code migration lub moj khaum, ib txheej txheem muaj 3 ntu.
Nyob rau hauv no txoj kev, yog dab tsi code migration nyob rau hauv faib system?
Code Migration . Kev lig kev cai, kev sib txuas lus hauv faib systems muaj kev txhawj xeeb nrog kev sib pauv cov ntaub ntawv ntawm. txheej txheem. Code migration nyob rau hauv lub broadest kev txiav txim siab deals nrog tsiv cov kev pab cuam ntawm cov cav tov, nrog rau. lub hom phiaj kom muaj cov kev pab cuam no raug tua ntawm lub hom phiaj.
Kuj Paub, Kuv yuav ua li cas thiaj li pab tau migration hauv code ua ntej? Mus rau Package Manager Console thiab ntaus ntawv pab kev tsiv teb tsaws chaw . Hom Pab - Kev tsiv teb tsaws chaw -ContextTypeName EXPShopContext. Cov lus txib no tsim ib kev tsiv teb tsaws chaw folder nrog InitialCreate. cs thiab Configuration.
Hais txog qhov no, code thawj migration yog dab tsi?
Entity Framework 4.3 suav nrog qhov tshiab Code Thawj Migrations feature uas tso cai rau koj mus incrementally evolve lub database schema raws li koj tus qauv hloov lub sij hawm. Nrog kev tsiv teb tsaws chaw , nws yuav cia li hloov kho cov txheej txheem database, thaum koj tus qauv hloov pauv yam tsis tau poob cov ntaub ntawv uas twb muaj lawm lossis lwm yam khoom siv database.
Kuv yuav rho tawm code migration ua ntej li cas?
Hauv kev xaus, cov kauj ruam los ua qhov no yog:
- Tshem tawm _MigrationHistory rooj los ntawm Database.
- Tshem tawm cov ntaub ntawv tsiv teb tsaws chaw nyob hauv koj qhov project's Migrations folder.
- Qhib-Migrations nyob rau hauv pob Manager Console.
- Ntxiv-migration Initial hauv PMC.
- Tawm tswv yim tawm cov cai sab hauv ntawm Txoj Kev Up hauv Qhov Kev Nkag Tebchaws Pib.
Pom zoo:
Vim li cas cov ntaub ntawv tsiv teb tsaws xav tau?
Cov ntaub ntawv tsiv teb tsaws yog ib qho tseem ceeb vim tias nws yog ib qho tsim nyog rau kev txhim kho lossis sib sau cov neeg rau zaub mov thiab chaw cia khoom, lossis ntxiv cov ntaub ntawv siv ntau yam xws li databases, cov ntaub ntawv warehouses, thiab cov ntaub ntawv pas dej, thiab cov phiaj xwm virtualization loj
Kev tsiv teb tsaws chaw yog dab tsi hauv kev txhim kho lub vev xaib?
Hauv kev siv thev naus laus zis (IT), kev tsiv teb tsaws yog cov txheej txheem ntawm kev txav los ntawm kev siv ib puag ncig kev ua haujlwm mus rau lwm qhov chaw ua haujlwm uas yog, feem ntau, xav tias yuav zoo dua. Kev tsiv teb tsaws tuaj yeem suav nrog kev hloov kho tshiab rau kho vajtse tshiab, software tshiab lossis ob qho tib si
Ib tus yuam sij txawv teb chaws puas tuaj yeem siv lwm tus yuam sij txawv teb chaws?
1 Teb. Tus yuam sij txawv teb chaws tuaj yeem siv txhua qhov chaw uas txhais tau tias nws txawv. Yog hais tias qhov tshwj xeeb teb yog nws tus kheej txhais tau tias yog tus yuam sij txawv teb chaws, nws tsis txawv. Yog tias nws yog thaj chaw tshwj xeeb, nws kuj tuaj yeem yog lub hom phiaj ntawm lwm FK
Dab tsi yog qhov yuav tsum tau muaj rau kev tsiv teb tsaws chaw nyob?
Ib qho kev xav tau rau txhua hom kev tsiv teb tsaws chaw nyob: Ob (lossis ntau dua) servers khiav Hyper-V uas: Txhawb nqa hardware virtualization. Siv cov processors los ntawm tib lub chaw tsim khoom
Dab tsi yog qhov kev txwv kev ncaj ncees piav qhia txog kev ncaj ncees lossis kev txwv txawv teb chaws?
Kev lees paub ncaj ncees xav kom tus yuam sij txawv teb chaws yuav tsum muaj tus yuam sij tseem ceeb sib xws lossis nws yuav tsum yog null. Qhov kev txwv no tau teev tseg ntawm ob lub rooj (niam txiv thiab menyuam); nws tuav cov ntawv xov xwm ntawm kab hauv cov rooj no. Nws txhais tau hais tias kev siv los ntawm kab hauv ib lub rooj mus rau lwm lub rooj yuav tsum siv tau