Video: Dab tsi yog Native SQL hauv hibernate?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
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.
Pom zoo:
Dab tsi yog c3p0 hauv Hibernate?
Los ntawm lub neej ntawd, Hibernate siv JDBC kev sib txuas txhawm rau cuam tshuam nrog cov ntaub ntawv. Hauv kev tsim khoom, koj yuav siv lub pas dej sib txuas sab nraud los ntawm kev siv cov ntaub ntawv sib txuas los ntawm JNDI lossis lub pas dej sib txuas sab nraud uas tau teeb tsa los ntawm qhov tsis muaj thiab classpath. C3P0 yog ib qho piv txwv ntawm kev sib txuas sab nraud
Dab tsi yog qhov sib txawv ntawm dej ntws thiab cog lus hauv hibernate?
Qhov sib txawv tseem ceeb yog tias thaum FlushMode tau teeb tsa rau COMMIT, commit() yaug qhov kev sib kho thiab tseem xaus rau chav ua haujlwm thiab koj tsis tuaj yeem thim rov qab qhov kev hloov pauv qhov twg raws li flush() tsuas yog ib qho kev sib koom ua ke ntawm kev sib kho
SetFirstResult nyob rau hauv hibernate yog dab tsi?
Hibernate pagination muab koj teev cov ntaub ntawv hauv cov lus nug raws li tus kheej xav tau. Hibernate muab koj cov hauv qab no cov txheej txheem los teeb tsa cov lus nug hauv hibernate. setFirstResult(int startRecordsFrom): Nrog kev pab los ntawm txoj kev no peb tuaj yeem teeb tsa qhov tshwm sim hauv cov lus nug uas pib los ntawm cov ntaub ntawv
JTA yog dab tsi hauv hibernate?
Hibernate yog qhov kev siv ntawm Java Persistence API (JPA) specification. JTA (Java Transaction API) yog Java tus qauv / kev qhia tshwj xeeb rau kev faib khoom lag luam. Nws los rau hauv daim duab thaum koj muaj kev lag luam uas hla ntau qhov kev sib txuas / DBs / peev txheej. Atomikos yog ib qho kev siv ntawm JTA
Open SQL thiab Native SQL hauv ABAP yog dab tsi?
Qhib SQL tso cai rau koj nkag mus rau cov ntaub ntawv database tau tshaj tawm hauv ABAP phau ntawv txhais lus tsis hais txog ntawm lub platform database uas R/3 system siv. Native SQL tso cai rau koj siv cov lus qhia tshwj xeeb SQL hauv ABAP/4 program