Video: Cov pob twg tuaj yeem siv los tsim SQL dynamic?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
PL/ SQL ntawv muab DBMS_SQL pob uas tso cai rau koj los ua haujlwm nrog dynamic SQL . Cov txheej txheem ntawm kev tsim thiab ua tiav cov dynamic SQL muaj cov txheej txheem hauv qab no. OPEN CURSOR: Lub dynamic SQL yuav ua tib yam li tus cursor. Yog li thiaj li yuav ua tau lub SQL ntawv nqe lus, peb yuav tsum qhib tus cursor.
Xav txog qhov no, dab tsi yog dynamic SQL hauv Oracle nrog piv txwv?
Rau piv txwv , dynamic SQL cia koj tsim cov txheej txheem uas ua haujlwm ntawm lub rooj uas nws lub npe tsis paub txog thaum lub sijhawm ua haujlwm. Oracle suav nrog ob txoj hauv kev los siv dynamic SQL hauv PL/ SQL ntawv application: Native dynamic SQL , koj qhov chaw dynamic SQL nqe lus ncaj qha rau PL/ SQL ntawv thaiv.
Tsis tas li ntawd, peb txoj hauv kev uas SQL dynamic tuaj yeem ua tiav yog dab tsi? Sau cov lus nug nrog cov ntsuas. Kev siv EXEC. Siv sp_executesql.
Tom qab ntawd, lo lus nug yog, koj puas tuaj yeem tsim lub luag haujlwm thiab muaj SQL dynamic hauv nws?
3 Teb. Koj ua tau 'tsis hu cov txheej txheem khaws cia los ntawm ib muaj nuj nqi , suav nrog cov txheej txheem khaws cia EXECUTE lossis SP_EXECUTESQL. Qhov no txhais tau tias koj ua tau 't muaj dynamic sql embedded nyob rau hauv ib muaj nuj nqi.
Dab tsi yog dynamic query hauv SQL?
Dynamic SQL hais txog SQL ntawv cov lus uas tau tsim thaum lub sijhawm ua haujlwm. Piv txwv li, tus neeg siv yuav nkag mus rau qhov kev tshawb nrhiav parameter, thiab cov nug yuav khiav nrog tus nqi ntawd. Dynamic SQL muaj txiaj ntsig thaum peb tsis paub lub rooj lossis cov khoom uas peb nug.
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