Labo ukudala amasayithi abo ngesandla, ngaphandle kosizo abaklami, noma yakha isicelo ezokwenza uxhumane isevisi eku-inthanethi abhekene nenkinga isitoreji. Somewhere kuzodingeka ukugcina wonke ama-akhawunti womsebenzisi nedatha zabo. Esebenzisa yini lokhu imayelana nani? MySQL - ukuthi kuyini nokuthi kungani lubalulekile kakhulu isihloko? Iqiniso lokuthi lokhu mshini ukufinyelela idatha egcinwe kumawebhusayithi noma izinhlelo ukufinyelela kwenethiwekhi ahlukahlukene. Ngakho-ke, kubalulekile ukwazi, MySQL - okungukuthi, iziphi izici isebenza uhlelo.
Ulimi Lokusebenza Oluhlelekile
Kodwa ekuqaleni kufanele zifunde ukuthi zonke izingcingo zenziwa ngokuthile. Kukhona ngempela nabaningi izindlela ukuhlela ukusesha idatha ethile atholakala ohlelweni ulwazi. Esinye sezizathu - a nombuzo ulimi ehlelekile (isiNgisi isifinyezo SQL). It ikuvumela ukudala imibuzo emifushane ukukhethwa imininingwane edingekayo. Kodwa ungasebenza kuphela izibhebhe ezimbili zamatshe-ntathu, okuyinto ukubeka phambili eziningi izimfuno okwamanje. Uma usebenzisa nakanjani ibe naso ukuze ucacise nombuzo ulimi Imininingwane olwakhiwe edingekayo futhi lapho sidinga ukuthathwa. Ungaveza ngisho nabaningana izimfuneko, hlunga, esekelwe isimo esithile, noma umane iqembu. Ukuze uthole amanani elincane idatha ezidingekayo esifanelana kahle impela.
Kungani udinga MySQL?
Futhi nale MySQL? Kuyini imayelana nani? Kanjani ukuqonda kungase abafundi inethiwekhi Yesikhashana eziningi, isandiso okhethekile olwakhiwe nombuzo ulimi. Kodwa kusetshenziswa kuphi? Iqiniso lokuthi lena inguqulo okhethekile ukuze isetshenziswe web izinhlelo ingxenye. ulimi oluvamile Oluhlelekile eside yakhelwe ukusebenza kwi-computer, kuyilapho MySQL - kuwebhu segment.
Uyini umehluko phakathi MySQL futhi SQL
Yilokho umehluko kumasegmenti isicelo futhi umehluko oyinhloko kuyinto. Kodwa kunomehluko ezithile zenqubo. Ngakho, ngaphambi kokuba ukusebenza database usebenzisa imibuzo MySQL, udinga ukufinyelela. Yebo, futhi MySQL ukusebenza ngokwalo, uma sikubeka kahle, akunakwenzeka. Ngakho-ke, ngokuvamile kusetshenziswa eyodwa ulimi lokwakha izinhlelo ezengeziwe (ikakhulukazi PHP, nakuba ungakwazi ukuhlangabezana Abaklami udale uxhumano owawubizwa MySQL iseva).
Kuyini isicelo?
Manje, lapho siphendula umbuzo «MySQL - okungukuthi," ngaphambi kokuqhubeka amaphutha kungenzeka ukuthi singenzeka ngenkathi kubhalwa izinhlelo, kufanele ucabangele izinto eziningi: ukuthi lezo zicelo, amatafula egciniwe kanye namarekhodi. Masiqale ngombuzo: zingabantu emfushane okuqukethwe umyalezo code ku nokuhlinzekwa idatha, futhi kufanele siphathe ulwazi mayelana kuphi uyozifuna, kanye angukhiye lapho usesho oyokwenziwa. Ukuze, ukubheka lapho, kufanele kube yinkinga. Futhi yilokho angukhiye? Noma kangaki ungathola ukhiye? Ukuhlukanisa idatha ezidingekayo ukusebenzisa esiyingqayizivele ulwazi isimiso. Abakwazi ukwenza njenge inombolo siqu noma enye idatha. Kodwa okuhle nakakhulu wukuthi usebenzise recognizers ilayisensi.
Kuyini database?
Uphi idatha egcinwe by MySQL ukufinyelela? Yiqiniso, kule yolwazi! Ngo MySQL, zingabantu mgudumbili ithebula equkethe ulwazi olufanele. Kulokhu idatha elibonakala ukubaluleka okungase kube ngenxa amakholomu egciniwe. Futhi ulwazi kuncike omusha ngamunye sengezwe ukudala umugqa omusha. inani elikhulu amatafula kungenzeka eziqukethwe yolwazi (kuqhathaniswa angenamkhawulo), kodwa database kuthinta ubukhulu nesivinini idatha impendulo. Kodwa ngaphambi kokuthi asebenze database, kumelwe uqiniseke ukuthi kukhona usekelo isofthiwe ezidingekayo kanye MySQL Server bazokwazi ukuqala. Nakuba konke lapha incike izimo kokuqala - uma asebenza ukusingathwa esikhokhelwayo, konke cishe njalo ezitholakele. Kodwa uma babeqashe iseva, phezu okuyinto kudingeka usebenzele ukuba uhambe kusuka ekuqaleni, MySQL egciniwe, futhi ayikwazi ukusebenza kahle ngenxa yokuthi akukho isofthiwe evumela ukuba ahumushe idatha.
Kuyini ithebula?
Ithebula, njengoba sekushiwo, leli thuluzi, okuyinto igcina idatha ezidingekayo. Babe they isici? Lapho edala itafula, qiniseka ukhombise egciniwe + kepha uyoba ngowompristi. Isimo lapho amatafula aziphilele ngawodwa abe yizinto, kunalokho eziyinkinga - ngenxa yokuthi amathuluzi kakhulu isofthiwe zenzelwe kangangokuthi bayophihlizwa basebenzisane izinhlelo ezithile.
Indlela bheka ngokuvamile itafula MySQL? Sinenkosi Imininingwane namakholomu (othile uhlobo idatha) kanye uchungechunge lapho ulwazi olugcinwe kwi ngesihloko ngasinye. Nge uchungechunge namanje kuphela - kukhona isihloko esisha - ingeza umugqa omusha (ngokususa isuswe). Nge namakholomu kancane nzima. Iqiniso lokuthi ikholomu eyodwa ungaba uhlobo olulodwa kuphela idatha. Ngakho, uma umsebenzi wenziwa nge ikholomu ezinombolo, ubhala umbhalo akukwazi kuwo. Uhlobo oluthile izinhlobo ezahlukene, kukhona abaningana (mayelana 30, wayeseyitholile akhangwa sihloko ehlukile).
Kuyini irekhodi?
Futhi asanda ngaphambi kokudlulela amaphutha ezingase ezenzeka phakathi ukusetshenziswa MySQL, - ukuqopha. Amarekhodi ngalinye (noma umugqa) Kufanele ube esehlukile evumela ukubheka ke ethebuleni noma amatafula amaningi. Izindawo ezingaba nokukhawulela nobude bawo, kodwa ukuze ubuke kalula kule "manual" Imodi yakhetha ngokuletha ifomu "okuvamile." Ingqikithi ukuncipha okukhulu kangaka ukuthi rekhodi kuphihlizwe eziningana futhi ibekwe lamatafula ahlukahlukene. Naphezu kwakho konke lokhu division, kungenzeka ukubeka ndawonye sibonga esehlukile. Sense actuation ifomu evamile ukuba iqembu ulwazi izinto ngesisekelo kunokuthile abafana ngakho. Ngokwesibonelo, umtapo kungadalwa ithebula "Indoda", "Izincwadi 'futhi' izingodo". Nakuba practice lingasuswa ukusebenza futhi omunye etafuleni nge kokukodwa, ezokwenza aqukethe lonke ulwazi oludingekayo.
amaphutha kungenzeka uma usebenzisa
manje Ungaya isihloko №2. Yingakho kukhona amaphutha? Ezimweni eziningi, zonke ugxeka isici womuntu. Lokhu kungaba iphutha aphansi ukuthi sekungene ikhodi ngenkathi isethiwe, noma ngendlela engafanele ihlanganiswe nombuzo:
- Uma kukhona nenkinga yokuxhuma database, kumele uhlole ubuqiniso balo, kanye ifayela sicelo: inganikelwa sinegama elingalungile, noma iphasiwedi database kuso. Mhlawumbe, MySQL umyalezo wephutha kwenzeka ngenxa yokushoda sokubaluleka kokubeka ithuluzi software, okuyinto kumele ixhunywe ku-database bese ukunikeza ufunda ulwazi.
- Lapho zicela idatha ku-amatafula kudingeka anakekele eliphezulu emagama idatha, kanye ukuhlanekezela ukudluliswa kolwazi kusuka kuseva MySQL kuwe. Njengoba sekushiwo ngenhla, njengoba umthetho, MySQL isetshenziswa ukusekelwa yibo "abaxhumanisi", ngakho yilutho ihlolwe ngamathuluzi ukulungisa iphutha ukuthi idatha edingekayo uze nhlobo. Uma they sondela, kodwa awukwazi ukuzisebenzisa - kusho ibhizinisi kulungiswa idatha etholakele. Kulokhu, kuyinto efiselekayo uzame ngemigudu lwezisebenzi, uthome kulencane amavolumu zokusebenza. Kufanele kukhunjulwe, ikakhulukazi labo ukuthi usanda kuqala baqonde izinhlelo ukuthi lokhu endaweni lapho konke isixazululekile umkhuba nesiphambeko MySQL, ungakwazi ukuzikhipha, kokuthi wazama zonke izindlela ezingakhona.