Tsim tus database: cov tswv yim thiab cov tswv yim daws teeb meem

Tsab xov xwm no piav qhia txog cov txheej txheem uas cov neeg tsim kev kawm hu ua "tsim kom muaj ib lub database". Peb yuav piav qhia tias nws yog qhov tseem ceeb heev. Zoo dua, ntawm chav kawm, cov neeg uas tsis muaj lub sij hawm pub dawb, tsis txhob mus rau cov "cov tsiaj qus". Nws yooj yim dua rau kev tso siab rau txoj haujlwm no rau ib tug kws tshaj lij. Nws zoo heev uas niaj hnub nim no hauv Internet muaj kev tshaj tawm zoo ib yam. Piv txwv, muaj ib lub network ntawm kev sib txuas ua haujlwm pub dawb lossis ib tus kws kho mob zoo ib yam li koj tuaj yeem yooj yim nrhiav tau ntawm cov khoom pauv. Ua li no, koj yuav tsum tau thov rau kev tsim cov kev pab cuam xws li ib tsab xov xwm tsis tu ncua, piav txog txoj hauj lwm tsim nyog.

Dab tsi yog qhov kev tsim ntawm database? Muaj ob hom database: desktop thiab tus thov kev pab neeg rau zaub mov. Yuav kom tsim tau ib lub desktop databases koj xav tau ib qho kev pab xws li Access. Koj tuaj yeem nrhiav tau nws hauv txhua qhov office suite. Tam sim no Access yog tso tawm los ntawm Infra Office, Microsoft thiab ntau lwm tus tsim ntawm chaw ua hauj lwm tej pob khoom. Raws li tus qauv ntawm tus neeg siv khoom, tus qauv unpretentious ua tau los ntawm qhov kev kawm "kev kawm" Delphi. Cov mob loj databases yog tam sim no sau rau ntawm Oracle thiab Visual Fox Pro. Cov software platforms yog nruab nrog cov cuab yeej graphical rau tsim cov lus nug rau databases ntawm 500,000 thiab 1,000,000 los yog kaum tawm lab ntawm cov kab.

Xav txog qhov kev cog lus tshaj plaws rau lub cajmeem xyoo dhau los Delphi 6.0. Peb hais ib zaug tias lub creation ntawm ib tug database nyob rau hauv Delphi - nws tsis yog cia li tau txais cov ntaub ntawv * .db los yog * bdb, thiab txhim kho nws rau PC, nyob thiab automation. Yog li, Delphi 6.0 tsim database ntaub ntawv nyob rau hauv subroutine, nyob rau hauv cov ntawv qhia zaub mov loj ntawm qhov chaw loj hlob, Hnub Base Desktop 6.0.

Ntawm no koj yuav pom tag nrho cov cuab yeej tsim nyog rau tsim database ntaub ntawv, muab nws yam thiab ua ntej populating. Nco ntsoov tias koj yuav muaj peev xwm tsim thiab ua haujlwm nkaus xwb cov ntaub ntawv uas tus tsav tsheb tau nruab rau hauv lub tshuab. Piv txwv, ua hauj lwm nrog hom Visual Fox Pro 9.0, koj yuav tsum nruab ib tus neeg tsav tsheb sab nraud mus rau lub operating system.

Raws li rau kev khiav hauj lwm ntawm qhov kev zov me nyuam nrog lub database tsim rau Delphi 6.0, tsis muaj nws cov hav zoov nrog lub platform nws tus kheej, qhov teeb meem no yog daws los ntawm kev txhim kho thiab sib koom ntawm Cov Ntaub Ntawv Laj Cav 6.0 (BDE).

Yog li, yog tias koj tau txiav txim siab ua haujlwm nrog Paradox cov ntaub ntawv, ces los ntawm kev sau cov kev pab cuam hauv cov ntawv nyuaj, koj yuav tsum sau qhov chaw nyob rau hauv Data Base Engine 6.0 pob, uas muaj xws li cov ntaub ntawv cov paths, lawv cov khoom thiab lub npe database. Lub tswv yim no ua haujlwm thaum koj tsiv mus rau cov kev pabcuam koj tsim rau lwm lub computer.

Pob cov ntaub ntawv Base Cav 6.0 yuav tsum muab ntsia rau hauv lub computer uas koj nruab Delphi 6.0 tsim los tshuab code.

Tsim cov ntaub ntawv ntawm Delphi 6.0 yog qhov cuab tam heev. Ib qho kev kawm theem pib rau kev khaws cov ntaub ntawv nrog rau ib qho ntaub ntawv database yog tau los ntawm ob peb keystrokes. Ntawm no lub ntsiab nyuaj lies nyob rau hauv kev siv ntawm relational cov ntaub ntawv ntawm lub database. Yog li SDNF 3 tuaj yeem pom tau hais los ntawm qhov teev ob DBGRID cov rooj. Thiab tau txais ntau hom kev tshaj tawm hauv QReport yog ib zaj dab neeg tag nrho uas koj tsis txawm xav kov txog. Peb tsuas yog hais tias nws zoo dua tsis txhob cuam tshuam cov cai ntawm tsim cov kev pab cuam rau hauv lub thoob khib nyiab, txij li txhua tus neeg siv ntawv qhia rau cov neeg uas tsis paub SQL yuav tsum tau programmed anew ...

Kev siv database creation nyob rau hauv qhov chaw ua hauj lwm suite tsis yooj yim. Nkag mus rau qhov program, koj mus saib tau cov cuab yeej tsim nyog rau kev tsim kho lossis kho kom raug cov ntaub ntawv database. Ntawm no koj tsis tas yuav ua tshwj xeeb los tsim ib daim ntawv tshaj qhia lossis ib daim ntawv tshiab ntawm txoj haujlwm no. Txhua yam yog daws tau intuitively. Yog li ntawd, tsim kom muaj kev sib txuas ntawm cov ntxhuav, siv cov cuab yeej graphical, uas, yuav luag ib tus kov, tuaj yeem txuas ob qho tseem ceeb rau tus yuam sij.

Hauv tsab ntawv no, tsuas yog qhov kev tsim ntawm cov ntaub ntawv ntawm kev cob qhia thiab cov pob khoom siv. Raws li txoj haujlwm loj, tsis paub txog lub neej ntawm cov platforms no, koj yuav tsis daws qhov teeb meem kev khiav hauj lwm loj databases.