Hierarchical data model

Zvinhu zvinowanzotarisana muhukama hwakadaro, hunonzi huchizvarwa. Kazhinji pane kutaura pamusoro pehukama hwakadaro se "chikamu-chose", ukama hwokugadzirisa kana hukama hwehupenyu. Zvimwe zviri muhukama hwakadaro zvinoumba muti, unonzi girafu yakarongeka, ndiko kuti, kuva ne vertex imwe chete isiri pasi peimwe imwe miti. Iyi vertex inonzi midzi yemuti. Kukurukurirana pakati pezviso zvakasara zvinowanikwa sezvinotevera: chero imwe yemiti inogadziriswa chete kune vertex imwe iri pamusoro payo. Kunyengedza, chirevo chemashoko ehurumende chinonzwisiswa sekusanganiswa kwezvinyorwa zvinyorwa zvinobatanidzwa nehutano hwemhando kuva imwechete kana miti yakawanda. Mumuenzaniso uyu, marudzi ose ehukama hunoumbwa nemhando "imwe kusvika kune dzakawanda", uye pane grafu izvi zvinomiririrwa nemiseve. Icho chinotarisa kuti chirevo chemashoko ehurumende chakakosha chine rudzi rwakadaro rwekubatana pakati pezvinhu, semumhuri, asi pane chimwe chinhu chakasiyana: pamusoro wega wega kune chinhu chimwechete chikuru. Izvi zvinoreva, mumhando yakadaro yedhayamato, mhando mbiri chete yekukurukurirana pakati pezvinyorwa zvezvinhu zvakabvumirwa: imwe-kune-imwe kana imwe-kune-zhinji. Dhiyabhorosi dhiyabhorosi ndiyo inonyanya kushandisa nheyo dzemhepo, kureva kuti, kuwanika kunogona chete kuburikidza nehutano hwehutano hwakatsanangurwa kare.

Kana iwe uri kuenzanisa zviitiko, iwe unowanzoda hukama-kune-hukama hwakawanda. Kuti ubvise chigadziro chakadaro, iwe unogona kuratidza zvakabuda zvakadai sekudzoka kwezvinhu. Zvisinei, kudzokorora kwezvinhu kunokanganisa: kunogona kunge kusina kufanana kwemashoko. Izwi rakakurumbira remhando rine maitiro akadaro sekupa hurumende kupinda kune humwe hutano hwakagara hwakagadzwa nekuda kwehupenyu hwahwo. Zvisinei, iyewo ane utera. Izvo zvakabatana nekushaikwa kwekushandura kune zvakadai mumutambo wemhando, kunyanya, kusakwanisa kwekuvapo kwevabereki vakawanda pane chimwe chinhu, pamwe nekushaya kukwanisa kuwana zvakananga kune data. Izvi zvinoita kuti zvirege kushandiswa mumamiriro ekugara nguva dzose kwekukumbira kwezvikumbiro zvisati zvagadzirirwa mberi. Nzira yepamusoro yepamusoro yepamusoro yevashandisi ine imwezve yeruzhinji. Iyo inowanikwa muchokwadi chokuti ruzivo rwekudzoka kubva kumaodzanyemba kwemazuva ekupedzisira harukwanise kutungamirirwa kune node dziri pamusoro apa.

Sezvo nheyo dzehutano hwemashoko muhutungamiri hwemagariro ndeye chikamu uye munda. Pasi pemunharaunda yedhadharo, tsika yekutsanangura chiduku chiduku chisingaoneki chechidimbu chinowanikwa kumunhu. Nezvikamu, zvakajairika kutsanangura chimiro uye muenzaniso wechikamu. Rudzi rwechikamu nderimwe mazita ezvinyorwa zvemashamba eminda izvo zvinosanganisira. Chiitiko chechikamu chinoumbwa kubva kune mamwe maitiro emunda. Izwi rakakurumbira remhando, sezvatotaurwa pamusoro apa, rinoumbwa pamagiramu emagadziro ezvinyorwa. Kana tikazvifungisisa pamwero weiyo pfungwa, saka inongova nyaya chaiyo ye network network. Muchimiro chemazuva ano, rudzi rwechikamu runoenderana nemirairo, uye kune ma-arcs rudzi rwehukama huri mu "mababa-mbeu". Pane mutemo wakaoma pano, mbeu yemadzinza inogona kuva nemadzitateguru mumwe chete. Muzhinji, iyi muenzaniso inoratidzika semunhu asingatauri akabatanidzwa girafu, ane musimboti wemuti, unobatanidza zvikamu zvose. Inzvimbo yakadzama yemhando yakasiyana- siyana inosanganisira yakagadzirwa nemiti yemiti. Muenzaniso wacho pachawo muti, pamusoro wepamusoro pane chimwe chinhu chakakosha, pachikamu chechipiri akaiswa zvinhu zvechikamu chechipiri, chechitatu - chechitatu, nezvimwe zvakadaro.

Kubva mune zvinyorwa izvi, unogona kuwana imwe pfungwa yekuti chidimbu chekuita dhigirii ndechei.