Dab tsi yog Native SQL hauv hibernate?
Dab tsi yog Native SQL hauv hibernate?

Video: Dab tsi yog Native SQL hauv hibernate?

Video: Dab tsi yog Native SQL hauv hibernate?
Video: Tsis Yog Hmoo (cover by: Adeline Moua) 2024, Kaum ib hlis
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Kev tshaj tawm. Koj siv tau haiv SQL los qhia cov lus nug database yog tias koj xav siv cov ntaub ntawv tshwj xeeb xws li cov lus nug cov lus qhia lossis CONNECT lo lus tseem ceeb hauv Oracle. Hibernate 3. x tso cai rau koj teev tus sau ntawv SQL ntawv , suav nrog cov txheej txheem khaws cia, rau txhua qhov tsim, hloov kho, tshem tawm, thiab thauj khoom ua haujlwm.

Cov lus nug tseem yog, dab tsi yog addScalar hauv hibernate?

Piav addScalar txoj hauv kev Hibernate . addScalar txoj kev qhia qhov tshwm sim ntawm cov lus nug kom rov qab cov khoom rau ib tus neeg npe kab, tsis yog cov koom haum. Sau tawm cov qauv tsim siv hauv Hibernate lub moj khaum.

Tsis tas li ntawd, kev siv cov lus nug ib txwm nyob hauv hibernate yog dab tsi? Hibernate tso cai rau peb mus tua cov haiv neeg SQL ntawv cov lus nug rau txhua qhov tsim, hloov kho, rho tawm thiab rov ua haujlwm. Qhov no muaj txiaj ntsig yog tias koj xav txhim kho kev ua haujlwm ntawm koj daim ntawv thov siv cov lus nug tshwj xeeb. Hauv hibernate, koj tuaj yeem tua koj haiv neeg SQL ntawv cov lus nug uas siv Session. createNativeQuery() txoj kev.

Kuj nug, dab tsi yog haiv neeg SQL lus nug?

Txog Native SQL Queries . JPA tso cai SQL ntawv siv rau nug cov khoom, lossis cov ntaub ntawv. SQL lus nug tsis tau txhais, thiab kis ncaj qha mus rau lub database. SQL lus nug tuaj yeem siv rau qib siab lus nug uas yuav tsum tau database tshwj xeeb syntax , los yog los ntawm cov neeg siv uas yooj yim dua nyob rau hauv lub SQL ntawv hom lus tshaj JPQL lossis Java.

Dab tsi yog qhov txawv ntawm HQL thiab haiv neeg SQL?

HQL yog ib hom lus nug-oriented lus, zoo ib yam li SQL ntawv , tab sis es tsis txhob ua haujlwm ntawm cov ntxhuav thiab kab, HQL ua haujlwm nrog cov khoom tsis tu ncua thiab lawv cov khoom. Qhov no yog qhov tseem ceeb qhov sib txawv ntawm hql vs sql ua . HQL yog lub superset ntawm JPQL, Java Persistence Query Language.

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