Cov txheej txheem:

Koj tuaj yeem siv cov txheej txheem khaws cia thiab lossis ua rau cov ntaub ntawv no li cas?
Koj tuaj yeem siv cov txheej txheem khaws cia thiab lossis ua rau cov ntaub ntawv no li cas?

Video: Koj tuaj yeem siv cov txheej txheem khaws cia thiab lossis ua rau cov ntaub ntawv no li cas?

Video: Koj tuaj yeem siv cov txheej txheem khaws cia thiab lossis ua rau cov ntaub ntawv no li cas?
Video: Saib Mis paub Poj niam (hluas nkauj) tus yam ntxwv lub siab 2024, Kaum ib hlis
Anonim

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

  1. Qhib qhov project database hauv Solution Explorer.
  2. Nyem rau ntawm Database Schema Saib los ntawm Saib cov ntawv qhia zaub mov.
  3. Qhib qhov project folder los ntawm Schema View menu, uas muaj cov khoom uas yuav tsum tau sim.
  4. Txoj cai nyem rau ntawm qhov khoom uas yuav tsum tau sim, thiab Tsim Chav Tests yuav tsum tau nyem.

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