Cov txheej txheem:
Video: Koj tuaj yeem siv cov txheej txheem khaws cia thiab lossis ua rau cov ntaub ntawv no li cas?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Peb tuaj yeem ua tiav a khaws cov txheej txheem thaum twg peb xav nrog kev pab los ntawm exec hais kom ua, tab sis a ua rau tsuas tuaj yeem raug tua thaum twg ib qho kev tshwm sim (ntxig, rho tawm, thiab hloov tshiab) raug rho tawm haujlwm ntawm lub rooj uas ua rau yog txhais. Cov txheej txheem khaws cia ua tau coj input parameters, tab sis peb tsis tuaj yeem hla tsis tau raws li kev nkag mus rau a ua rau.
Kuj tseem paub yog, peb puas tuaj yeem siv cov txiaj ntsig hauv cov txheej txheem khaws cia?
Koj hu tsis tau Ua rau los ntawm Cov txheej txheem khaws cia , as Ua rau yog tsim rau ntawm rooj thiab raug rho tawm implicitly. Tab sis koj ua tau hu khaws cov txheej txheem mus los ntawm ua rau , mas ua nco ntsoov nws yuav tsum tsis txhob recursive.
Tsis tas li ntawd, qhov sib txawv ntawm cov txheej txheem thiab qhov tshwm sim yog dab tsi? Ua rau thiab Txheej txheem yog Cheebtsam ntawm Advanced SQL. Ua rau thiab Txheej txheem ob leeg ua ib txoj haujlwm tshwj xeeb ntawm lawv qhov kev ua tiav. Qhov tseem ceeb qhov sib txawv ntawm Trigger thiab Txheej txheem yog tus Ua rau executes cia li tshwm sim ntawm ib qho kev tshwm sim whereas, lub Txheej txheem raug tua thaum nws tau hais meej meej.
Nyob rau hauv txoj kev no, dab tsi yog qhov zoo ntawm cov txheej txheem khaws cia tshaj cov ntaub ntawv tsim tawm?
Qhov zoo ntawm a khaws cov txheej txheem dhau a database triggers tsis tuaj yeem lees txais qhov ntsuas lossis rov qab qhov txiaj ntsig. A Ua rau yog nyob ntawm lub rooj thiab daim ntawv thov tsis muaj kev tswj kom tsis txhob tua a ua rau thaum tsis xav tau. Ntawm qhov tod tes, a khaws cov txheej txheem tuaj yeem hu tau raws li xav tau.
Koj sim cov txheej txheem database thiab ua li cas?
Piav qhia yuav ua li cas kuaj cov txheej txheem database thiab ua rau
- Qhib qhov project database hauv Solution Explorer.
- Nyem rau ntawm Database Schema Saib los ntawm Saib cov ntawv qhia zaub mov.
- Qhib qhov project folder los ntawm Schema View menu, uas muaj cov khoom uas yuav tsum tau sim.
- Txoj cai nyem rau ntawm qhov khoom uas yuav tsum tau sim, thiab Tsim Chav Tests yuav tsum tau nyem.
Pom zoo:
Ntev npaum li cas cov ntaub ntawv tuaj yeem khaws cia hauv cov ntaub ntawv warehouse?
10 xyoo Yog li ntawd, cov ntaub ntawv khaws cia hauv lub tsev khaws ntaub ntawv li cas? Cov ntaub ntawv yog feem ntau khaws cia rau hauv ib lub tsev khaws ntaub ntawv los ntawm cov txheej txheem rho tawm, hloov pauv thiab thauj khoom (ETL), qhov twg cov ntaub ntawv tau muab rho tawm los ntawm qhov chaw, hloov mus rau qhov zoo cov ntaub ntawv thiab ces loaded rau hauv ib lub tsev khaws khoom .
Vim li cas kem taw qhia cov ntaub ntawv khaws cia ua cov ntaub ntawv nkag ntawm disks sai dua li kab qhia cov ntaub ntawv khaws cia?
Kem oriented databases (aka columnar databases) yog qhov tsim nyog rau kev ntsuas kev ua haujlwm ntau dua vim tias cov ntaub ntawv hom ntawv (kem hom) qiv nws tus kheej kom nrawm dua cov lus nug ua - scans, aggregation thiab lwm yam. Ntawm qhov tod tes, kab oriented databases khaws ib kab (thiab tag nrho nws. kab) contiguously
Yuav ua li cas ntxig cov ntaub ntawv hauv DataBase siv cov txheej txheem khaws cia hauv MVC?
Ntxig Cov Ntaub Ntawv Los Ntawm Cov txheej txheem khaws cia hauv MVC 5.0 Nrog Cov Ntaub Ntawv Ua Ntej Ua Haujlwm Tsim cov ntaub ntawv thiab tsim lub rooj. Hauv cov kauj ruam no, peb tam sim no yuav tsim Cov Txheej Txheem Khaws Cia. Hauv cov kauj ruam tom ntej, peb txuas database rau peb daim ntawv thov los ntawm Data First Approach. Tom qab ntawd, xaiv ADO.NET Entity Data Model thiab nyem rau ntawm Ntxiv khawm
Peb puas tuaj yeem siv cov txiaj ntsig hauv cov txheej txheem khaws cia?
Trigger: Cov txiaj ntsig tuaj yeem ua tiav ntawm qhov kev txiav txim siab ntawm lub rooj nyiam, hloov tshiab, rho tawm, lossis hloov kho. Cov txheej txheem khaws cia: Cov txheej txheem khaws cia tsis tuaj yeem raug hu los ntawm lub luag haujlwm vim tias cov haujlwm tuaj yeem raug hu los ntawm cov lus xaiv thiab Cov Txheej Txheem Khaws tsis tuaj yeem hu los ntawm
Kuv yuav luam cov txheej txheem khaws cia ntawm cov ntaub ntawv li cas?
2 Cov lus teb Siv tswj studio. Txoj nyem rau ntawm lub npe ntawm koj lub database. Xaiv txhua txoj haujlwm. Xaiv tsim cov ntawv sau. Ua raws li tus wizard, xaiv rau cov txheej txheem sau ntawv nkaus xwb. Siv cov ntawv nws tsim thiab khiav nws ntawm koj cov ntaub ntawv tshiab