Impela, sicela uthole indatshana echazwe ngezansi:
Ukushintsha iphasiwedi yomsebenzisi ku-SQL kuwumsebenzi ovamile wabalawuli besistimu nabathuthukisi ngokufanayo. Kubalulekile ukuvuselela njalo nokuqinisa izinyathelo zokuphepha ezivikela idatha yomsebenzisi, enye yazo ehlanganisa ukubuyekezwa njalo kwamaphasiwedi. Izikripthi ze-SQL zinikeza ikhono lokusingatha le misebenzi ngempumelelo.
Ake sihlole isixazululo esichaza ukuthi ungenza kanjani ngakho.
Ikhambi
Indlela yokubuyekeza iphasiwedi yomsebenzisi incike kakhulu ohlelweni oluthile lwe-SQL olusetshenziswayo. Kungakhathaliseki ukuthi, umqondo oyisisekelo uyafana futhi udinga ukusebenzisa umyalo WOKUBUYISA ngesigatshana esithi 'SET'.
-- here is a general sample of changing a password on a hypothetical user table UPDATE users_table SET password = 'new_password' WHERE username = 'target_user';
Kodwa-ke, ukugcina amaphasiwedi embhalweni ongenalutho akukhuthazwa ngenxa yezinkinga zokuphepha. Kungaba okuvikeleke kakhulu ukugcina amanani asheshayo amaphasiwedi esikhundleni salokho.
Ikhodi Incazelo
Nansi indlela elula, eqondile, isinyathelo ngesinyathelo sekhodi:
1. Okokuqala, shayela isitatimende 'SOBUYISA' esisetshenziselwa ukuguqula amarekhodi akhona kuthebula.
2. Bese, cacisa ithebula ofuna ukushintsha idatha kulo, esimweni sethu, leli lithi โusers_tableโ.
3. Okulandelayo, sebenzisa isigatshana esithi 'SET' ukuze ucacise amakholomu ukuze ashintshwe nokuthi kufanele athuthukiswe ngani.
4. Okokugcina, cacisa umbandela okhomba ukuthi yimaphi amarekhodi okumele avuselelwe kusetshenziswa isigatshana esithi 'LAPHO'.
UPDATE users_table SET password = SHA2('new_password', 256) WHERE username = 'target_user';
Esibonelweni esibuyekeziwe, amaphasiwedi agcinwa njengamavelu asheshi kusetshenziswa umsebenzi we-SHA2. Uma igama eliyimfihlo lishintshwa, liyasheshiswa kusetshenziswa umsebenzi ofanayo, ukuqinisekisa inani eligciniwe kanye nokufana kokufaka.
Imitapo yolwazi ye-SQL kanye Nemisebenzi Ehilelekile
Ku-SQL, lolu hlobo lwezibuyekezo ngokuvamile lwenziwa nge- QAPHELA umyalo, njengoba kukhonjisiwe ezibonelweni ezingenhla. Lona umyalo we-SQL ojwayelekile otholakala cishe kuzo zonke isizindalwazi se-SQL.
Nakuba imininingwane egciniwe ethuthuke kakhudlwana ingase ibe nemiyalo ethile noma imisebenzi yokuphatha amagama ayimfihlo abasebenzisi, umyalo othi UPDATE unikeza isisombululo esiyisisekelo esingasetshenziswa kabanzi.
Ukuze kukhuliswe ukuvikeleka kwedatha, imisebenzi efana ne-SHA2 ingasetshenziselwa i-hashing yephasiwedi. Lo msebenzi uguqula okokufaka okunikeziwe kube okokukhiphayo kobude obugxilile okumelela 'izigxivizo zeminwe' kokokufaka, okunikeza ileveli yokuvikela ekuhlaselweni okulula.
Sengiphetha, kubalulekile ukuqaphela ukuthi ukuphatha ukuqinisekisa komsebenzisi kudinga intshisekelo ejulile ekuvikelekeni kolwazi. Khumbula, sebenzisa izindlela ezingcono kakhulu zokuphatha amagama ayimfihlo futhi ubuyekeze izindlela zakho ukuze uhambisane nezindinganiso zakamuva zokuphepha.