Cov txheej txheem:
Video: Qhov twg zoo dua HQL lossis cov qauv?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Cov txheej txheem , nyob rau hauv txoj kev xav yuav tsum muaj tsawg dua nyiaj siv ua haujlwm tshaj ib HQL cov lus nug (tshwj tsis yog cov lus nug muaj npe, uas kuv yuav tau txais). Qhov no yog vim Cov txheej txheem tsis tas yuav parse dab tsi. HQL Cov lus nug tau txheeb xyuas nrog ANTLR-raws li parser thiab tom qab ntawd cov txiaj ntsig AST tau hloov mus rau SQL. Cov txheej txheem - Tsis tas yuav parse ua ntej tsim.
Tsuas yog li ntawd, qhov txawv ntawm HQL thiab cov txheej txheem yog dab tsi?
HQL tuaj yeem ua ob qho kev xaiv thiab tsis xaiv cov haujlwm. Cov txheej txheem tuaj yeem xaiv cov ntaub ntawv nkaus xwb, koj tsis tuaj yeem ua cov haujlwm tsis xaiv siv yam lus nug. HQL tsis txhawb pagination, tab sis pagination tuaj yeem ua tiav nrog Cov txheej txheem . Cov txheej txheem muaj kev nyab xeeb los ntawm SQL txhaj.
Qhov thib ob, qhov txiaj ntsig ntawm Hibernate Criteria API yog dab tsi? Hauv Hibernate , cov API Cov Cai pab peb tsim yam nug cov khoom dynamically. Cov txheej txheem yog lwm cov txheej txheem ntawm kev muab cov ntaub ntawv sib nrug ntawm HQL thiab cov lus nug SQL haiv neeg. Qhov tseem ceeb qhov zoo ntawm API Cov Cai yog tias nws yog intuitively tsim los manipulate cov ntaub ntawv tsis siv tej hard-coded SQL nqe lus.
Ib yam li ntawd, koj tuaj yeem nug, qhov twg zoo dua HQL lossis SQL?
Haiv neeg SQL ntawv tsis tas yuav nrawm dua HQL . HQL thaum kawg kuj muab txhais ua SQL ntawv (koj tuaj yeem pom cov lus tsim tawm thaum khiav daim ntawv thov nrog cov cuab yeej show_sql teeb rau qhov tseeb). Hauv kev nkag mus rau hauv cov ntaub ntawv lub sij hawm poob thaum tshawb nrhiav kab, thiab tsis yog thaum hloov cov ntaub ntawv rau hauv koj daim ntawv thov.
Yuav ua li cas koj ua tus txheej txheem?
Siv cov txheej txheem rau kev nug
- Qhib koj cov lus nug hauv Design view.
- Nyob rau hauv cov lus nug tsim daim phiaj, nyem qhov Kev Cai kab ntawm daim teb uas koj xav ntxiv cov txheej txheem.
- Ntxiv cov txheej txheem thiab nias ENTER.
- Nyem Khiav kom pom cov txiaj ntsig hauv Datasheet saib.
Pom zoo:
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