I zingubudlelwane imodeli idatha, egciniwe, imodeli kanye nomklamo busebenze

Ingqikithi futhi isisekelo sanoma ibuphi database model yayo. It is waqoqa uhlu isakhiwo idatha kanye imisebenzi eyenziwa kuwo. I uthenge kabanzi kunazo phezulu, inethiwekhi kanye zingubudlelwane imodeli idatha. Zonke umuntu angasebenzisa inhloso yazo, njengoba obutholakala inkumbulo sekhompyutha: egcinwe isikhala idiski njengoba kudingeka, futhi afakwa uhlelo inkumbulo. Lapha ukucubungula yabo iqala. Ngamanye amazwi, i-database - okungukuthi, ulwazi jikelele zangaphandle, abalingisa ngendlela ekhethekile, futhi ehlanganisa ezithile endaweni isihloko. Ngokuvamile, lokhu nezakhi ezihlukene, izakhiwo, kanye into efanayo. Njengoba konke kuhlobene emhlabeni, kuba DB kubonakala.

Ngokwengxenye enkulu, ukuze belingisa yimuphi isizinda kuphela zingubudlelwane imodeli idatha eyanele. Kodwa nje umklamo walo, ngokomthetho kule scheme of the ubuhlobo kungabangela ubunzima. Yilapho-ke singanikezwanga ngesikhathi kudalwa izincazelo semantic izindlela, okuyizinto njalo ekhona izifundo kunoma yimuphi umkhakha.

Lokhu izinga kuye kwaholela kulokho okuye kwabizwa wadala umfuziselo nekutfutfuka kwelizinga database. Kuvumela ezingaphezu kuka enembile, kodwa ngesikhathi esifanayo futhi ngempela ngokusemthethweni ukuchaza indawo eqondile izifundo. Kaningi, isikimu ukumodeliswa enjalo sisetshenziswa kuphela lapho besanda kuqala yokudala database. Ukuze base kuthathwe ukhonkolo imodeli semantic. Kususelwa ke, thina eyenzelwe idayagramu lomqondo, bese konke lokhu is iguqulwe futhi livela okubizwa ngokuthi zingubudlelwane imodeli egciniwe.

Ezweni design, ngoba lokhu kukhona amasu athile. Ziyakwazi obucacile nobuqondakalayo uchaza zonke izigaba senzo practice. Ulwazi lwabo aqede isidingo ukuhlola izinhlelo ezengeziwe abathintekayo ukudalwa onobuhle semantic. UMdali kwanele ukwazi izinto eziyisisekelo isikimu ngayingcwelisa ukwazi imithetho translation main. Kulokhu, konke kuhamba kahle, futhi kusukela lomqondo uthole zingubudlelwane imodeli idatha ngaphandle kokuphazanyiswa.

Kufanele kuqashelwe ukuthi eminye imfundamakhwela semininingwane Abadali benza iphutha underestimating ukubaluleka semantic ukumodeliswa schema ngesandla. Yiqiniso, in the world of intuthuko kwezobuchwepheshe ke ubhekwa sadlala isikhathi nomzamo. Kodwa lo mbono kuyinto ngokuphelele. Futhi lokhu kanje:

1. Modeling ngesandla ukudala uhlelo enamandla ezibukwayo futhi semantic we DB esizayo. Futhi lokhu esikhathini esizayo, kwathatha isinyathelo imodeli zingubudlelwane ukugwema amaphutha angathí sina futhi ukuhlola ngokugcwele kakhulu ubunjalo kanye nobuntu isihloko sendawo ethile.

2. Isinyathelo ukumodeliswa semantic sihlinzekela imibhalo ebalulekile ngingakhetha angafakwa ngesandla. Ngokwesibonelo, amashadi, amatafula, namazwana. Zingaba usizo hhayi kuphela edala, kodwa futhi ukuxhashazwa okwengeziwe yemininingo egciniwe seludaliwe.

Kodwa uma inkulumo kuyiqiniso, kungase kuqashelwe ukuthi ukudalwa kohlelo lwetibalo inguqulelo kwalo okwalandela kulokho okubizwa ngokuthi "zingubudlelwane imodeli idatha" ngesandla - nenqubo enzima futhi eziyinkinga. Cabanga database lapho kumathebula imidvwebo ezingaphezu kwenkulungwane. Okulandelayo, ngicabanga akunandaba mqondo ukukhuluma.

inqubo yokugunyazwa ngokudala database iqala umdwebo lezi amatafula esifanayo, nokudala ingobo yomlando kwemibhalo imisebenzi phrojekthi. Isisiza kakhulu umsebenzi umklami, kuyasiza e ukusetshenziswa isizinda. Kodwa lesi simiso like sombhalo evamile esekela eyisisekelo kuphela umyalo uvo, kuhlela bunjalo bembhalo kanye kuqinisekiswa. Kungokwemvelo ukunweba ngayo ezengeziwe izici yesakhi. Futhi lena ngempela umqondo elula ayizange usehambile. Ngakho, inqubo ezishintshayo we lomqondo semininingwane schema ibe zingubudlelwane iqala.