Video: Vim li cas cov lus nug parameterized muaj kev nyab xeeb?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Parameterized queries ua kom raug hloov ntawm kev sib cav ua ntej khiav SQL nug . Nws tshem tawm tag nrho qhov muaj peev xwm ntawm "kev qias neeg" cov tswv yim hloov lub ntsiab lus ntawm koj nug . Ntawd yog, yog tias cov tswv yim muaj SQL, nws tsis tuaj yeem dhau los ua ib feem ntawm qhov ua tiav vim tias SQL yeej tsis raug txhaj rau hauv cov lus qhia.
Ntxiv rau qhov no, cov lus nug parameterized txhais li cas?
A parameterized lus nug (tseem hu ua ib nqe lus npaj) yog a txhais tau tias ntawm pre-compiling a SQL ntawv nqe lus kom txhua yam koj xav tau muab yog cov "parameters" (xav tias "variables") uas yuav tsum tau muab tso rau hauv nqe lus rau nws yuav tsum tau ua. Nws yog feem ntau siv raws li ib tug txhais tau tias ntawm kev tiv thaiv SQL ntawv txhaj tshuaj tiv thaiv.
Qhov thib ob, yuav ua li cas raws nraim cov lus nug parameterized pab tiv thaiv los ntawm SQL txhaj? Parameterized queries ua kom raug hloov ntawm cov lus sib cav ua ntej khiav qhov SQL lus nug . Nws tshem tawm tag nrho qhov muaj peev xwm ntawm "qhuav" cov tswv yim hloov lub ntsiab lus ntawm koj nug . Uas yog, yog hais tias cov tswv yim muaj SQL ntawv , nws tsis tuaj yeem dhau los ua ib feem ntawm qhov raug tua vim qhov SQL ntawv yeej tsis txhaj rau hauv nqe lus uas tshwm sim.
Tom qab ntawd, cov lus nug parameterized puas muaj kev nyab xeeb los ntawm SQL txhaj?
Tej yam dynamic SQL lus nug tsim siv invalidated neeg siv inputs yog yooj yim rau SQL txhaj . Qee txoj hauv kev tsim tawm siv los txhawm rau tiv thaiv SQL txhaj yog parameterized cov lus nug lossis cov txheej txheem khaws cia. A parameterized lus nug yog feem ntau ruaj ntseg tawm tsam SQL Txhaj kev tawm tsam.
Lub hom phiaj ntawm cov lus nug parameter yog dab tsi?
A parameter lus nug yog ib qho ntawm qhov yooj yim tshaj plaws thiab muaj txiaj ntsig zoo tshaj plaws lus nug koj tuaj yeem tsim. Nws tso cai rau koj los tsim ib qho nug uas tuaj yeem hloov kho yooj yim los cuam tshuam cov lus tshawb nrhiav tshiab. Thaum koj qhib a parameter lus nug , Kev nkag mus yuav ceeb toom koj rau lub sijhawm tshawb nrhiav thiab tom qab ntawd qhia koj nug cov txiaj ntsig uas cuam tshuam koj qhov kev tshawb nrhiav.
Pom zoo:
Yuav ua li cas koj tuaj yeem txav qhov taw tes nrawm nrawm mus rau qhov pib ntawm cov lus nug cov lus nug?
T lossis F: Nias Ctrl + txoj cai xub yuam sij kom txav qhov taw tes rau qhov pib ntawm lo lus tom ntej
Vim li cas huab cia muaj kev nyab xeeb?
Kev pheej hmoo ntawm huab cia Huab kev ruaj ntseg yog nruj, tab sis nws tsis yog infallible. Cybercriminals tuaj yeem nkag mus rau hauv cov ntaub ntawv no, txawm tias los ntawm kev twv cov lus nug txog kev nyab xeeb lossis hla tus password. Tsoom fwv tuaj yeem thov cov ntaub ntawv raug cai khaws cia hauv huab, thiab nws yog nyob ntawm huab cua muab kev pabcuam tsis kam nkag
Cov kev pabcuam lossis cov txheej txheem twg uas Secure Copy Protocol vam khom kom ntseeg tau tias kev hloov pauv kev nyab xeeb yog los ntawm cov neeg siv tau tso cai?
Cov kev pabcuam lossis cov txheej txheem twg uas Secure Copy Protocol vam khom kom ntseeg tau tias kev hloov pauv kev nyab xeeb yog los ntawm cov neeg siv tau tso cai? Secure Copy Protocol (SCP) yog siv los luam cov duab IOS kom ruaj ntseg thiab teeb tsa cov ntaub ntawv mus rau SCP server. Txhawm rau ua qhov no, SCP yuav siv SSH kev sib txuas los ntawm cov neeg siv uas tau lees paub los ntawm AAA
Kev tswj kev nyab xeeb thiab kev nyab xeeb yog dab tsi?
Cov txheej txheem kev nyab xeeb thiab kev cob qhia neeg ua haujlwm: Kev Tswj Xyuas Kev Nyab Xeeb hauv Chaw Ua Haujlwm. Kev tswj hwm kev ruaj ntseg tuaj yeem txhais tau tias yog kev txheeb xyuas thiab, tom qab ntawd, kev tiv thaiv ntawm lub koom haum cov cuab tam thiab cov phooj ywg txaus ntshai. Kev tswj hwm kev ruaj ntseg yog qhov kawg ntawm kev tiv thaiv lub koom haum - tag nrho thiab txhua yam hauv nws
Yuav ua li cas koj sau cov lus nug hauv lub zog lus nug?
Thawj kauj ruam hauv kev tsim koj tus kheej Power Query tsab ntawv yog ntxiv cov lus nug dawb paug rau Power BI Desktop. Txhawm rau ntxiv cov lus nug, nyem Tau Cov Ntaub Ntawv ntawm Lub Tsev ribbon nyob rau hauv lub qhov rai tseem ceeb, mus rau Lwm ntu, thiab nyem ob npaug rau Blank Query. Qhov no tso tawm Query Editor nrog cov lus nug tshiab uas teev nyob rau hauv Queries pane