锘??xml version="1.0" encoding="utf-8" standalone="yes"?> 銆銆闈㈠緗戠粶緙栫▼涓紬澶氱殑鍦板潃鍑芥暟錛屼綘hold浣忎簡涔堬紝tiger鍝ユ病hold浣忥紝鎵浠ュ氨鍐欎簡姝ょ瘒鏂囩珷錛屽笇鏈涘ぇ瀹惰兘hold浣忕綉緇滅紪紼嬨?/p> 銆銆鍓嶈█錛氱粨鏋勪綋struct in_addr緇撴瀯struct in_addr 鍦ㄦ枃浠朵腑瀹氫箟錛岀粨鏋刬n_addr 鏈変竴涓猽nsigned long int 綾誨瀷鐨勬垚鍛樺彉閲弒_addr.閫氬父鎵璇寸殑IP鍦板潃鐨勪簩榪涘埗褰㈠紡灝變繚瀛樺湪鎴愬憳鍙橀噺s_addr涓?/p> 銆銆緇撴瀯struct in_addr鐨勫師鍨嬪涓嬶細structin_addr{ unsigned long int s_addr;/*IP鍦板潃*/ }涓銆傚瓧絎︿覆IP鍦板潃杞崲涓轟簩榪涘埗褰㈠紡鐨処P鍦板潃鍑芥暟1.inet緋誨垪鍑芥暟鐨勫師鍨嬶細#include #include #include int inet_aton(const char *cp錛宻truct in_addr *inp);int addr_t inet_addr(const char *cp);int addr_t inet_network(const char *cp);char * inet_ntoa(struct in_addr in);struct in_addr inet_makeaddr(int net錛宨nt host);in_addr_t inet_lnaof(struct in_addr in);in_addr_t inet_netof(struct in_addr in);2.inet_aton()鍑芥暟int inet_aton(const char*cp錛宻truct in_addr *inp) 銆銆1>鍑芥暟浣滅敤錛歩net_ation()鍑芥暟灝嗗湪cp涓瓨鍌ㄧ殑鐐瑰垎鍗佽繘鍒跺瓧絎︿覆綾誨瀷鐨処P鍦板潃錛岃漿鎹負浜岃繘鍒剁殑IP鍦板潃錛岃漿鎹㈠悗鐨勫間繚瀛樺湪鎸囬拡inp鎸囧悜鐨勭粨鏋剆truct in_addr涓?/p> 銆銆2>褰㈠弬錛?const char *cp錛氭寚鍚戝瓧絎︾被鍨嬬殑IP鍦板潃銆備緥濡?#8220;192.168.1.11”錛?struct in_addr *inp錛氭寚鍚戜簩榪涘埗鐨勭綉緇滃瓧鑺傞『搴忕殑IP鍦板潃structin_addr{ unsignedlong s_addr } 3>鍑芥暟鎵ц鎴愬姛鍒欒繑鍥為潪0鍊鹼紝鍙傛暟鏃犳晥鍒欒繑鍥?. 4>瀹炰緥錛?include #include #include 銆銆#include #include #include int main() 銆銆{ char buffer[32];structin_addr in;in.s_addr =0;/*杈撳叆涓涓瓧絎︿覆褰㈠紡鐨処P鍦板潃*/ printf(“pleaseinput the ip addrss\n”);scanf(“%s”錛宐uffer);buffer[31]=‘\0’;printf(“original IP鍦板潃錛?s\n”錛宐uffer);if( 0 == inet_aton(buffer錛?amp;in)){ perror(“inet_aton”);exit(1);} else { printf(“after transfer錛?x%0x\n”錛宨n.s_addr);} 5> inet_aton鍑芥暟鏈鍚庤綆楀嚭鏉ョ殑鏄綉緇滃瓧鑺傚簭鐨勪簩榪涘埗IP 3.inet_addr()鍑芥暟in_addr_t inet_addr(const char *cp) 銆銆1>鍑芥暟浣滅敤錛氬畠灝嗗弬鏁癱p鎵鎸囧悜鐨勫瓧絎︿覆褰㈠紡鐨処P鍦板潃(“192.168.1.11”)杞崲涓轟簩榪涘埗鐨勭綉緇滃瓧鑺傚簭鐨処P鍦板潃褰㈠紡璇ュ嚱鏁扮殑緙虹偣鏄細濡傛灉IP鍦板潃鏄?55.255.255.255.閭d箞璋冪敤inet_addr()鍑芥暟鍚庡皢榪斿洖-1(鍥犱負-1鐨勮ˉ鐮佸艦寮忔槸0xFFFFFFFF)銆傛墍浠ヤ笉寤鴻浣跨敤inet_addr()鍑芥暟錛岃屾槸浣跨敤inet_aton()鍑芥暟銆?/p> 銆銆2>鍑芥暟褰㈠弬錛歝onst char*cp錛歝p鎸囧悜瀛楃涓插艦寮忕殑IP鍦板潃銆?/p> 銆銆3>鍑芥暟榪斿洖鍊鹼細鍑芥暟鎴愬姛鍚庤繑鍥炰簩榪涘埗鐨勭綉緇滃瓧鑺傚簭鐨処P鍦板潃(struct in_add)錛屽惁鍒欒繑鍥?1. 4>inet_addr璁$畻鍑烘潵鐨勬槸緗戠粶瀛楄妭搴忕殑浜岃繘鍒禝P 5>鍑芥暟瀹炰緥錛?include #include #include 銆銆#include #include #include int main() 銆銆{ char buffer[32];structin_addr in;in.s_addr =0;/*杈撳叆涓涓瓧絎︿覆褰㈠紡鐨処P鍦板潃*/ printf(“pleaseinput the ip addrss\n”);scanf(“%s”錛宐uffer);buffer[31]=‘\0’;printf(“original IPaddress錛?s\n”錛宐uffer);if((in.s_addr = inet_addr(buffer))==INADDR_NONE){ perror(“inet_addr”);exit(1);} else { printf(“after transfer錛?x%0x\n”錛宨n.s_addr);} 4.inet_network in_addr_t inet_network(constchar *cp) 銆銆1>鍑芥暟浣滅敤錛氬皢鍙傛暟cp鎸囧悜鐨勫瓧絎︿覆褰㈠紡鐨勭綉緇滃湴鍧杞崲涓轟富鏈哄瓧鑺傞『搴忓艦寮忕殑浜岃繘鍒禝P鍦板潃銆?/p> 銆銆2>鍑芥暟褰㈠弬錛?const char *cp錛?cp鎸囧悜瀛楃涓插艦寮忕殑IP鍦板潃銆?/p> 銆銆3>鍑芥暟榪斿洖鍊鹼細鎵ц鎴愬姛鍚庤繑鍥炶漿鎹㈠悗鐨勭粨鏋滐紝鍙傛暟鏃犳晥鍚庤繑鍥?1. 4>inet_network榪斿洖鐨勬槸涓繪満瀛楄妭搴?>鍑芥暟瀹炰緥錛?include #include #include 銆銆#include #include #include int main() 銆銆{ char buffer[32];structin_addr in;in.s_addr =0;/*杈撳叆涓涓瓧絎︿覆褰㈠紡鐨処P鍦板潃*/ printf(“pleaseinput the ip addrss\n”);scanf(“%s”錛宐uffer);buffer[31]=‘\0’;printf(“original IPaddress錛?s\n”錛宐uffer);if((in.s_addr = inet_addr(buffer))==INADDR_NONE){ perror(“inet_addr”);exit(1);} else { printf(“after transfer錛?x%0x\n”錛宨n.s_addr);}鎬葷粨錛?.inet_addr鍜宨net_network鍑芥暟閮芥槸鐢ㄤ簬灝嗗瓧絎︿覆褰㈠紡杞崲涓烘暣鏁板艦寮忕敤鐨?2.inet_addr榪斿洖鐨勬暣鏁板艦寮忔槸緗戠粶瀛楄妭搴忥紝鑰宨net_network榪斿洖鐨勬暣鏁板艦寮忔槸涓繪満瀛楄妭搴忋?/p> 銆銆3.inet_addr 鍜宨net_network鏈変竴涓皬緙洪櫡錛岄偅灝辨槸褰揑P鏄?55.255.255.255鏃訛紝榪欎袱涓嚱鏁頒細璁や負榪欐槸涓棤鏁堢殑IP鍦板潃錛岃繖鏄巻鍙查仐鐣欓棶棰橈紝鍏跺疄鍦ㄧ洰鍓嶅ぇ閮ㄥ垎鐨勮礬鐢卞櫒涓婏紝榪欎釜 255.255.255.255鐨処P閮芥槸鏈夋晥鐨勩?/p> 銆銆4.inet_aton璁や負255.255.255.255鏄湁鏁堢殑錛屾墍浠ュ緩璁嬌鐢╥net_aton.騫朵笖inet_aton鍑芥暟榪斿洖鐨勬槸緗戠粶瀛楄妭搴忕殑IP鍦板潃銆?/p> 銆銆浜屻傝繘鍒禝P鍦板潃杞崲涓哄瓧絎︿覆褰㈠紡鐨処P鍦板潃1.char * inet_ntoa(struct in_addr in);1>鍑芥暟浣滅敤錛氬皢鏁板間負in鐨勭綉緇滃瓧鑺傚簭褰㈠紡鐨勪簩榪涘埗IP鍦板潃杞崲涓哄瓧絎︿覆褰㈠紡鐨処P鍦板潃銆?/p> 銆銆2>褰㈠弬錛歴truct in_addr in錛氭寚鍚戜簩榪涘埗鐨処P鍦板潃3>鍑芥暟榪斿洖鍊鹼細鎵ц鎴愬姛榪斿洖緇撴灉瀛楃涓茬殑鎸囬拡錛屽弬鏁版棤鏁堣繑鍥濶ULL. 4>鍑芥暟瀹炰緥錛?include #include #include 銆銆#include #include #include int main() 銆銆{ char buffer[32];char *str;structin_addr in;in.s_addr =0;/*杈撳叆涓涓瓧絎︿覆褰㈠紡鐨処P鍦板潃*/ printf(“pleaseinput the ip addrss\n”);scanf(“%s”錛宐uffer);buffer[31]=‘\0’;printf(“original IP鍦板潃錛?s\n”錛宐uffer);if( 0 == inet_aton(buffer錛?amp;in)){ perror(“inet_aton”);exit(1);} else { printf(“the first transfer錛?x%0x\n”錛宨n.s_addr);} printf(“begin two process錛歕n”);if( (str =inet_ntoa(in) == NULL ){ printf(“inet_ntoa錛歛rgumentinvalid\n”);} else { printf(“thesecond transfer錛?s\n”錛宻tr);}璇存槑錛?.鍑芥暟inet_ntoa()鐨勮繑鍥炲間負涓涓寚鍚戝瓧絎︿覆鐨勬寚閽堬紝璇ュ唴瀛樺嚱鏁癷net_ntoa()姣忔璋冪敤閮戒細閲嶆柊瑕嗙洊錛屽洜姝ゅ嚱鏁頒笉瀹夊叏錛屽彲鑳藉瓨鍦ㄦ煇縐嶉殣鎮?.瀹炰緥錛?include #include #include 銆銆#include #include #include int main() 銆銆{ structin_addr ip1錛宨p2;char *str1 ;char *str2;ip1.s_addr = 192<<24| 168 <<16 |1 <<8 | 1;ip2.s_addr =255<<24 | 255 <<16 |255<<8|255;str1 = inet_ntoa(ip1);str2 = inet_ntoa(ip2);printf(“ip1錛?x%xà%s\n”錛宨p1.s_addr錛宻tr1);printf(“ip2錛?x%xà%s\n”錛宨p2.s_addr錛宻tr2);}杈撳嚭緇撴灉涓猴細ip1錛?0xc0a80101à255.255.255.255;ip2錛?xffffffffà255.255.255.255;琛ㄦ槑鍑芥暟inet_ntoa鍦ㄨ繘琛屼簩榪涘埗IP鍦板潃鍒板瓧絎︿覆IP鍦板潃鐨勮漿鎹㈣繃紼嬩腑鏄笉鍙噸鍏ョ殑錛岃繖涓嚱鏁拌漿鎹袱涓笉鍚岀殑IP鍦板潃寰楀埌浜嗗悓涓涓粨鏋溿傛綾誨嚱鏁板湪璋冪敤涔嬪悗錛岄渶瑕佺珛鍗沖皢緇撴灉鍙栧嚭錛屾病鏈夊彇鍑虹粨鏋滀箣鍓嶄笉鑳借繘琛屽悓鏍峰嚱鏁扮殑璋冪敤銆?/p> 銆銆涓夈傛渶鏂扮殑鍦板潃杞崲鍑芥暟inet_pton()鍜宨net_ntop()鍑芥暟inet_pton鍜宨net_ntop榪?涓嚱鏁拌兘澶熷鐞唅pv4鍜宨pv6.綆楁槸姣旇緝鏂扮殑鍑芥暟浜嗐俰net_pton鍑芥暟鍘熷瀷濡備笅[灝?#8220;鐐瑰垎鍗佽繘鍒?#8221; -> “鏁存暟”]錛屽茍涓旇繖涓や釜鍑芥暟鏄竴濂楀畨鍏ㄧ殑鍗忚鏃犲叧鐨勫湴鍧杞崲鍑芥暟銆傛墍璋撳畨鍏ㄥ嵆榪欎袱涓嚱鏁版槸鍙噸鍏ョ殑錛屽茍涓旇繖浜涘嚱鏁版敮鎸佸縐嶅湴鍧綾誨瀷錛屽寘鎷琁Pv4鍜孖Pv6. 1.inet_pton()鍑芥暟1>鍑芥暟鍔熻兘inet_pton()鍑芥暟灝嗗瓧絎︿覆綾誨瀷鐨処P鍦板潃杞崲涓轟簩榪涘埗綾誨瀷銆?/p> 銆銆2>鍑芥暟鍘熷瀷#include #include #include intinet_pton(int af錛?const char *src錛?void *dst);3>鍑芥暟褰㈠弬錛氾紵 int af錛歛f琛ㄧず緗戠粶綾誨瀷鐨勫崗璁棌錛屽湪IPv4涓嬬殑鍊間負AF_INET;錛?src錛氬瓨鏀鵑渶瑕佽漿鎹㈢殑瀛楃涓詫紵 dst 錛氬瓨鏀捐漿鎹㈠悗鐨勭粨鏋滐紝鍦↖Pv4涓嬶紝dst鎸囧悜緇撴瀯struct in_addr鐨勬寚閽堛?/p> 銆銆4>鍑芥暟榪斿洖鍊煎綋鍑芥暟inet_pton()鐨勮繑鍥炲間負-1鐨勬椂鍊欙紝閫氬父鏄敤浜巃f鎵鎸囧畾鐨勫崗璁棌涓嶆敮鎸侀犳垚錛屾鏃秂rrno鐨勮繑鍥炲間負EAFNOSUPPORT;褰撳嚱鏁扮殑榪斿洖鍊間負0鏃訛紝琛ㄧずsrc鎸囧悜鐨勫間笉鏄悎娉曠殑IP鍦板潃;褰撳嚱鏁扮殑榪斿洖鍊間負姝e兼椂錛岃〃紺鴻漿鎹㈡垚鍔熴?/p> 銆銆2.inet_ntop()鍑芥暟1>鍑芥暟鍔熻兘inet_pton()鍑芥暟灝嗕簩榪涘埗鐨勭綉緇淚P鍦板潃杞崲涓哄瓧絎︿覆銆?/p> 銆銆2>鍑芥暟鍘熷瀷錛?include #include #include intinet_nton(int af錛?const void *src錛?char *dst錛宻ocklen_t cnt);3>鍑芥暟褰㈠弬錛氾紵 int af錛歛f琛ㄧず緗戠粶綾誨瀷鐨勫崗璁棌錛屽湪IPv4涓嬬殑鍊間負AF_INET;錛?src 錛氫負闇瑕佽漿鎹㈢殑浜岃繘鍒禝P鍦板潃錛屽湪IPv4涓嬶紝src鎸囧悜涓涓猻tructin_addr緇撴瀯綾誨瀷鐨勬寚閽堛傦紵 dst鎸囧悜淇濆瓨緇撴灉緙撳啿鍖虹殑鎸囬拡錛?cnt鐨勫兼槸dst緙撳啿鍖虹殑澶у皬4>鍑芥暟榪斿洖鍊糏net_ntop()鍑芥暟榪斿洖涓涓寚鍚慸st鐨勬寚閽堛傚綋鍙戠敓閿欒鏃訛紝榪斿洖NULL.褰揳f璁懼畾鐨勫崗璁棌涓嶆敮鎸佹椂錛宔rrno璁劇疆涓篍AFNOSUPPORT;褰揹st緙撳啿鍖哄ぇ灝忚繃灝忕殑鏃跺檈rrno鐨勫間負ENOSPC. 3.鍑芥暟瀹炰緥錛?include #include #include 銆銆#include #include #include int main(int argc錛宑har *argv[]) 銆銆{ struct in_addr ip;char ipstr[] = “192.168.1.1”;char addr[ADDRLEN];const char * str = NULL;int err = 0;if(err > 0){ printf(“inet_pton錛歩p %s value is 錛?x%x\n”錛宨pstr錛宨p.s_addr);} //鎶?92.168.12.255杞崲涓虹綉緇滃瓧鑺傚簭ip.s_addr = htonl(192 << 24 | 168<<16 | 12<<8 | 255);str = (const char *)inet_ntop(AF_INET錛?void*)&ip錛?char *)&addr[0]錛孉DDRLEN);if(str){ printf(“inet_ntop 錛歩p 0x%x is%s\n”錛宨p.s_addr錛宻tr);}鍥涖俰net_makeaddr()鍑芥暟錛宨net_lnaof()鍑芥暟鍜宨net_netof()鍑芥暟1.struct in_addr inet_makeaddr(int net錛宨nt host) 銆銆1>鍑芥暟鍔熻兘錛氫竴涓富鏈虹殑IP鍦板潃鍒嗕負緗戠粶鍦板潃鍜屼富鏈哄湴鍧錛宨net_makeaddr()鍑芥暟灝嗕富鏈哄瓧鑺傚簭鐨勭綉緇滃湴鍧net鍜屼富鏈哄湴鍧host鍚堝茍鎴愪竴涓綉緇滃瓧鑺傚簭鐨処P鍦板潃銆?/p> 銆銆2>鍑芥暟褰㈠弬錛氾紵 int net錛氬瓨鏀劇綉緇滃彿鍙傛暟(浜岃繘鍒跺艦寮忕殑涓繪満瀛楄妭搴?錛?int host錛氬瓨鏀句富鏈哄彿鍦板潃(浜岃繘鍒跺艦寮忕殑涓繪満瀛楄妭搴? 銆銆3>鍑芥暟榪斿洖鍊鹼細榪斿洖涓涓綉緇滃瓧鑺傚簭鐨処P鍦板潃4>鍑芥暟瀹炰緥錛歶nsigned long net錛宧ost;net = 0x0000007F;host = 0x00000001;struct in_addr ip = inet_makeaddr(net錛宧st);2.in_addr_t inet_lnaof(struct in_addr in) 褰撶劧姣忎釜浜洪兘甯屾湜鏈変竴浠借柂姘翠赴鍘氱殑宸ヤ綔錛屾瘯绔熼渶瑕佸吇瀹剁硦鍙o紝鐢熷効鑲插コ銆傛墍浠ユ垜浠湪鎬ヤ簬瀹炵幇鐞嗘兂鐨勫悓鏃朵篃涓嶈兘涓嶉【鍙婃潵鑷簬鐜板疄鐨勮冮獙銆傛垜鎯籌紝鑳藉瀹屽叏鏀懼緱涓嬪幓孌婃涓鎼忓茍鏈緇堝彇寰楁垚鍔熺殑浜哄簲璇ユ槸鏋佸皯鏁幫紝鏇村鐨勪漢娌℃湁榪欐牱鐨勫媷姘斿拰榪愭皵銆傛垜浣滀負涓鍚嶈丳rogrammer錛屽湪蹇冩佷笂鐩告瘮浜庝互鍓嶆洿涓哄鉤鍜屼簡錛屾瘯绔熺Н钃勫拰鏀跺叆閮借繕綆楄鐨勮繃鍘匯傜劧鑰屽笇鏈涜耽寰楀皧閲嶇殑蹇冨嵈鏇翠負嫻撶儓浜嗭紝姣斿璇達紝鍦ㄦ渶榪戣繖涓騫村鐨勬椂闂撮噷錛屽潥鎸佸啓鍗氬鍜屾妧鏈垎浜紱涔嬪墠鐙珛寮鍙戠殑鏈嶅姟鍣ㄥ鉤鍙板凡緇忎負澶氬灝忓瀷鍏徃浣跨敤騫舵垚鍔熼儴緗蹭笂綰匡紱闅忕潃鏋舵瀯璁捐緇忛獙鐨勪笉鏂彁鍗囷紝璁捐鏈熼棿鑰冭檻鐨勮瑙掍篃鏇翠負澶氭牱銆傚敖綆″姝わ紝蹇冮噷濮嬬粓榪樻槸鍩嬭棌鐫閭d釜宸ㄥぇ鐨勭己鎲撅紝涓轟粈涔堜粛鐒舵病鏈変竴涓湡姝e睘浜庤嚜宸辯殑浜у搧鍛紵涓轟粈涔堜笉鑳藉儚涓涓緩絳戝笀閭f牱鍛婅瘔鍛ㄥ洿浜猴紝榪欎釜寤虹瓚鏄垜鐨勪綔鍝併?/p>
]]>
涔嬪墠涔熸湁榪囧嚑嬈¤緸鑱岀殑緇忓巻錛屽彧鏄繖嬈$殑鎰熻姣旇緝濂囨紝鍙兘鏄勾榫勭殑鍘熷洜鍚э紝紜疄涓嶈兘鍋氬埌騫磋交鏃墮偅鏍鋒鏃犻【蹇屼簡銆傚嵆渚胯繖嬈′粛鐒惰兘欏哄埄鎵懼埌鏂扮殑宸ヤ綔錛屼絾鏄笅涓嬈″憿錛熻繖縐嶆兂娉曞湪涔嬪墠鐨勭鑱屼腑鏄粠鏈冭檻鐨勩傛湁閴翠簬姝わ紝灝辯敤浜嗗皢榪戜竴鍛ㄧ殑鏃墮棿榪涜浜嗘繁鍏ョ殑鎬濊冦傜鑱岀殑鐪熷疄鍘熷洜絀剁珶鏄粈涔堬紝鍗充究鏄湁澶氫釜鐞嗙敱錛屽埌搴曞摢涓涓墠鏄渶鏈閲嶈鐨勫憿錛熺劧鍚庡張鎯籌紝紱昏亴鐨勭洰鐨勫張鏄粈涔堬紝涔熷氨鏄涓轟簡浠涔堬紝鑰岃繖涓洰鐨勪竴鏃﹁揪鍒頒箣鍚庡張鑳界粰浣犲甫鏉ヤ粈涔堬紝鎵甯︽潵鐨勮繖浜涘張鑳藉浠婂悗鐨勫彂灞曟湁浠涔堟牱鐨勫府鍔╋紝褰掓牴緇撳簳涓鍙ヨ瘽錛屼富鍥犲拰闀胯繙鐨勮鍒掓槸鍚︽槸鍖歸厤鐨勩傚甫鐫榪欐牱涓榪炰覆鐨勭枒闂紑濮嬩簡鑷垜鍙嶇渷鐨勮繃紼嬨?/span>
榪樻槸鍏堣璇村師鍥犲惂銆?/span>
絎竴錛屽搴殑璐熸媴銆備富瑕佹潵鑷埗姣嶇殑韜綋錛屽啀鏈夊氨鏄瀛愯繕灝忥紝榪欐牱渚挎棤娉曚繚鎸佽繖縐嶆瘡鍛ㄥ嚭宸殑鐜扮姸浜嗐?/span>
絎簩錛屽伐浣滄劅瑙変笉濂姐傛瘡鍛ㄥ湪澶╂觸宸ヤ綔鐨勬椂鍊欙紝鍛ㄥ洿娌℃湁涓涓猅eam Member錛岃繛娌熼氬拰寮寮鐜╃瑧鐨勪漢閮芥病鏈夛紝鍛ㄥ洿閮芥槸鍏朵粬欏圭洰緇勭殑鎴愬憳錛屾病鏈変竴涓璇嗙殑銆?/span>
絎笁錛屾矡閫氭晥鐜囧亸浣庯紝鏈夌殑鏃跺欏洜涓轟竴涓緢綆鍗曠殑Bug鎴栨柊闇姹傦紝涓嶅緱涓嶅弽澶嶅緢澶氭錛岃繖縐嶅紓鍦扮殑宸ヤ綔鏂瑰紡鍦ㄦ矡閫氫笂紜疄瀛樺湪鏋佸ぇ鐨勯殰紕嶃?/span>
絎洓錛岀幇鏈夌殑宸ヤ綔鍜屾垜鏈潵鐨勬妧鏈柟鍚戜笉鏄潪甯稿尮閰嶃傚嵆渚垮姝わ紝姣曠珶鏄丳rogrammer浜嗭紝搴斾粯璧鋒潵闂涓嶅ぇ銆?/span>
絎簲錛屽縐誨姩璁懼鐨勫紑鍙戜粛鐒朵繚鎸佺潃鏋佸ぇ鐨勭儹鎯咃紝甯屾湜鑳藉緇х畫浠庝簨榪欎竴鏂歸潰鐨勬妧鏈爺鍙戝伐浣溿?/span>
絎叚銆佸湪浜嗚В涔嬪悗錛屾劅瑙夊鍖呭叕鍙哥殑鏂囧寲鍜屾墍瑕佹眰鐨勬妧鑳藉鎴戞潵璇達紝紜疄闈炲父涓嶅悎閫傘備笉榪囪繖閲岀殑欏圭洰榪愪綔鏂瑰紡紜疄緇欎簡鎴戜竴縐嶈崇洰涓鏂扮殑鎰熻銆?/span>
宸笉澶氬氨鏄繖浜涗簡鍚с備粠涓婇潰鐨勫嚑鏉′腑榪涜鍒嗘瀽錛岀涓鏉℃槸鍒氭х殑闇姹傦紝娌℃湁浠涔堝彲璇寸殑錛岃繖鏄厖鍒嗗繀瑕佹潯浠躲傝屽湪鍏朵粬鍘熷洜涔嬩腑錛岀浜旀潯鏄渶鏈閲嶈鐨勶紝灝界宸茬粡Coding寰堝寰堝騫達紝浣嗙戶緇瑿oding涓嬪幓鐨勭儹鎯呬粛鐒跺拰褰撳垵涓鏍風偨鐑堬紝涔熺湡鐨勫笇鏈涜兘澶熷厬鐜板叆琛屼箣鍒濈殑瑾撹█錛孋oding鍒伴浼戙傜劧鑰屾墍涓嶅悓鐨勬槸錛岄殢鐫騫撮緞鐨勬敼鍙樺拰緇忛獙鐨勫澶氾紝涓嶅彲鑳藉啀鍍忎互鍓嶉偅鏍鋒祽嫻戝櫓鍣╃殑鍘籆oding浜嗐傝嚜宸變竴鐩撮潪甯告復鏈涜兘澶熸壘鍒頒竴涓潪甯擱潪甯擱傚悎鑷繁錛屽悓鏃跺張闈炲父闈炲父鏈夊叴瓚g殑鏂瑰悜錛屽湪榪欐潯璺笂錛屾渶澶у寲鑷繁鐨勭粡楠屽鹼紝鐢ㄥ嚑騫寸殑鏃墮棿鍋氬嚭涓涓湡姝e睘浜庤嚜宸憋紝鍚屾椂鍙堣兘璇佹槑鑷繁浠峰肩殑杞歡浜у搧鏉ャ?/span>
鍘熷洜錛氭煡璧勬枡鐭ラ亾IE6/IE7鏀寔鐨凱3P(Platform for Privacy Preferences Project (P3P) specification)鍗忚榛樿闃繪絎笁鏂規棤闅愮瀹夊叏澹版槑鐨刢ookie錛岀伀鐙愬拰璋鋒瓕鐩墠榪樹笉鏀寔P3P瀹夊叏鐗規э紝鎵浠ュ畠浠笉瀛樺湪姝ら棶棰樹簡銆?/span>
瑙e喅鏂規硶錛氬湪絎竴嬈¤幏鍙杔oginTicket鏃跺湪response涓緗畃3p澹版槑錛屽涓嬶細
浣跨敤root鐢ㄦ埛鐧誨綍錛屾垨鑰呯敤鏅氱敤鎴風櫥褰曚箣鍚庝嬌鐢╯u root鍒囨崲錛岀浉淇℃甯鎬漢閮戒細閫夋嫨鍓嶈呫?/p>
1銆佸垏鎹㈢洰褰曪細
cd /etc/sysconfig/network-scripts
2銆佷嬌鐢╲i緙栬緫鍣ㄦ墦寮ifcfg-eth0
vi ifcfg-eth0
淇敼鍏朵腑鍐呭錛?/p>
DEVICE=eth0
BOOTPROTO=static
IPADDR=192.168.1.3
NETMASK=255.255.255.0
GATEWAY=192.168.1.1
HWADDR=鍘熸潵鏄粈涔堝氨鏄粈涔?/p>
ONBOOT=yes
鐒跺悗閲嶅惎緗戝崱鏈嶅姟錛?/p>
service network restart
濡傛灉鏃犳硶浣跨敤service,閭d箞灝?sbin鍔犲叆鐜鍙橀噺錛屽鏋滃彲浠ヤ嬌鐢ㄥ垯涓嶉渶瑕佹墽琛屼笅闈㈠懡浠わ細
export PATH=$PATH:/sbin
榪欑淇敼鏂規硶鏄案涔呯殑錛屽嵆浣夸綘閲嶅惎鍚庝粛鐒舵湁鏁堬紝榪樻湁涓縐嶆瘮杈冨揩鎹風殑鏂規硶濡備笅錛?/p>
ifconfig eth0 192.168.1.3 netmask=255.255.255.0 up
绔嬮┈鐢熸晥銆?/p>
1 銆佸垏鎹㈢洰褰?/p>
cd
鍒?tmp 鐩綍錛歝d /tmp
鍒頒笂灞傜洰褰曪細cd ..
2 銆佹煡鐪嬪綋鍓嶇洰褰?/p>
pwd
3銆?鍒涘緩涓涓柊鐨勬枃浠跺す錛?/p>
mkdir
鍒涘緩涓灞傜洰褰曪細
鍒涘緩澶氬眰鐩綍錛?/p>
4 銆佸垹闄ょ洰褰曪細
rmdir [-p] 濡傛灉闇瑕佸眰綰у垹闄ょ洰褰曪紝灝遍渶瑕佸甫涓妏錛堝彧鑳藉垹闄ょ┖鐩綍錛?/p>
5銆佹煡璇㈢幆澧冨彉閲?/p>
echo $PATH 鎴栬?PATH
6銆佸垏鎹㈢敤鎴鳳細
su 鐢ㄦ埛鍚?/p>
7銆佺Щ鍔ㄦ枃浠?/p>
浠旂粏闃呰涓婇潰鐨勫懡浠わ紝浣犱細鍙戠幇mv榪樺彲浠ュ鏂囦歡榪涜浠庡懡鍚嶏紝涓婇潰鐨勫懡浠ゅ皢hellot.txt浠巃涓Щ鍔ㄥ埌浜哹涓紝騫舵敼鍚嶄負hello1.txt
8銆佹煡鐪嬫枃浠朵笌鐩綍
ls
ls -a 鐩綍鍚嶇О錛氬垪鍑虹洰褰曚腑鎵鏈夌殑鏂囦歡
ls -al 鐩綍鍚嶏細鍒楀嚭闀垮瓧絎︿覆錛屽寘鍚枃浠剁殑涓浜涜緇嗕俊鎭?/p>
濡傛灉娌℃湁緇欏畾鐩綍鍚嶏紝閭d箞灝辨槸褰撳墠鐩綍
9銆佹枃浠剁殑澶嶅埗錛?/p>
cp [-adfilprsu] 婧愭枃浠?nbsp; 鐩爣鏂囦歡 //灝嗘簮鏂囦歡鎷瘋礉鍒扮洰鏍囨枃浠?/p>
cp src1,src2,... des //灝嗗涓簮鏂囦歡鎷瘋礉鍒扮洰鐨勬枃浠跺す
cp榪欎釜鍛戒護闈炲父閲嶈錛屼笉鍚岀殑韜喚鎵ц瀵瑰懡浠や駭鐢熶笉鍚岀殑鏁堟灉錛屽挨鍏舵槸-a,-p鍙傛暟錛屽涓嶅悓鐨勮韓浠芥潵璇達紝鍖哄埆闈炲父澶с?/p>
渚?錛?/p>
浣跨敤root鎵ц錛?/p>
濡傛灉鎴戜滑瑕佸皢鏂囦歡鐨勬墍鏈夌殑灞炴у鍒惰繃鏉ワ紝鍒欒鍔犱笂鍙傛暟-a
澶嶅埗涓涓洰褰曞埌鍙﹀涓涓洰褰?cp -r /src /desc
10 銆佺Щ闄ゆ枃浠舵垨鐩綍
rm [-fir] 鏂囦歡鎴栫洰褰?/p>
-f 寮哄埗鐨勬剰鎬濓紝蹇界暐涓嶅瓨鍦ㄧ殑鏂囦歡錛屼笉浼氬嚭鐜拌鍛婁俊鎭?/p>
-i浜掑姩妯″紡錛氬垹闄ゅ墠錛屼細璇㈤棶鏄惁鍒犻櫎
-r 錛氶掑綊鍒犻櫎
榪欓噷涓嶅啀婕旂ず錛岃寰椾箣鍓嶇殑rmdir鍚楋紝鍙兘鍒犻櫎絀虹洰褰曪紝鎵浠ュ垹闄ら潪絀虹洰褰曞彧鑳戒嬌鐢╮m -r
11銆佹枃浠剁被瀹規煡璇?/p>
cat
-b:鍒楀嚭琛屽彿
-n:鍒楀嚭琛屽彿錛屽寘鎷┖鐧借
cat 鏄竴嬈℃у皢鏁版嵁鏄劇ず鍒板睆騫曚笂錛屽鏋滄兂涓欏典竴欏電殑鐪嬫庝箞鍔烇紵
浣跨敤more鍛戒護
more鍦ㄨ繍琛岀殑榪囩▼涓紝浣犳湁鍑犱釜鎸夐敭鍙互鎸夛細
絀烘牸閿細浠h〃鍚戜笅緲諱竴欏?/p>
Enter:浠h〃鍚戜笅婊氬姩涓琛?/p>
q:紱誨紑more
b錛氬線鍥炵炕欏?/p>
12 銆佸垱寤烘枃浠?/p>
touch
touch a.txt 灝變細鍦ㄥ綋鍓嶇洰褰曚笅鍒涘緩a.txt
13銆佹煡鎵炬枃浠剁殑鍛戒護
whereis ,find
whereis [-bmsu] 鏂囦歡鎴栫洰褰曞悕
-b:浜岃繘鍒舵枃浠?/p>
-m:鍙壘鍦ㄨ鏄庢枃浠秏anual璺緞涓嬬殑闂觸
-s:鍙壘source婧愭枃浠?/p>
-u:鏌ユ壘涓嶅湪涓婅堪涓変釜閫夐」涓殑鍏朵粬鐗規畩鏂囦歡
whereis ifconfig
涓嬮潰鐪嬬湅find鍛戒護
find [path] [option] [actioin]
鏌ユ壘/home涓嬮潰灞炰簬gavin鐨勬枃浠?/p>
find /home -user gavin
鏌ユ壘緋葷粺涓笉灞炰簬浠諱綍浜虹殑鏂囦歡
find / -nouser
鏌ユ壘鏂囦歡鍚嶄負passwd鐨勮繖涓枃浠?/p>
find / -name passwd
鏌ユ壘鏂囦歡綾誨瀷涓簊ocket鐨勬枃浠?/p>
find / -type s
14銆佺鐩樺拰鐩綍鐨勫閲?/p>
df:鍒楀嚭鏂囦歡緋葷粺鐨勬暣浣撶鐩樹嬌鐢ㄩ噺
du:璇勪及鏂囦歡緋葷粺鐨勭鐩樹嬌鐢ㄩ噺
15 鍒涘緩閾炬帴鏂囦歡
ln [-sf] 婧愭枃浠?nbsp; 鐩爣鏂囦歡
-s :鍒涘緩杞繛鎺ワ紝濡傛灉涓嶅姞鍒欐槸紜繛鎺?/p>
-f:濡傛灉鐩爣鏂囦歡瀛樺湪錛屽垯鍒犻櫎鍚庡啀寤?/p>
[root@localhost test2]# echo 'good'>a.txt
[root@localhost test2]# ls
a.txt
[root@localhost test2]# ln -s a.txt b
[root@localhost test2]# ls
a.txt b
[root@localhost test2]# ll
total 12
-rw-r--r-- 1 root root 5 Aug 8 01:09 a.txt
lrwxrwxrwx 1 root root 5 Aug 8 01:09 b -> a.txt
[root@localhost test2]# echo 'hello'>>b
[root@localhost test2]# cat b
good
hello
[root@localhost test2]# cat a.txt
good
hello
[root@localhost test2]# ln a.txt c
[root@localhost test2]# ll
total 20
-rw-r--r-- 2 root root 11 Aug 8 01:09 a.txt
lrwxrwxrwx 1 root root 5 Aug 8 01:09 b -> a.txt
-rw-r--r-- 2 root root 11 Aug 8 01:09 c
[root@localhost test2]# echo 'bad'>>c
[root@localhost test2]# cat c
good
hello
bad
[root@localhost test2]# cat a.txt
good
hello
bad
[root@localhost test2]# cat b
good
hello
bad
[root@localhost test2]# rm a.txt
rm: remove regular file `a.txt'? y
[root@localhost test2]# cat b
cat: b: No such file or directory
[root@localhost test2]# cat c
good
hello
bad
[root@localhost test2]#
榪愯涓婇潰鐨勫懡浠よ錛岀浉淇′綘瀵筶n鐨勪嬌鐢ㄤ細闈炲父娓呮鐨勩?/p>
15銆佹寕杞紺D
16銆佹枃浠跺帇緙?/p>
tar
-c:鍒涘緩涓涓帇緙╂枃浠?/p>
-v:鏄劇ず鍘嬬緝榪囩▼
-f:緇欏嚭鍘嬬緝鏂囦歡鍚?/p>
-x:瑙e帇鏂囦歡
-t::鏌ョ湅鍘嬬緝鍖呬腑鍙堝摢浜涙枃浠?/p>
涓斿彧鍏佽浣跨敤涓や釜闄勫姞鍙橀噺銆?br />鏂規硶涓錛?br />姣忔灝嗘暟緇勪腑鐨勫厓绱犲彸縐諱竴浣嶏紝寰幆K嬈★紝鍒欏疄鐜頒簡鍙崇ЩK浣嶃?br />渚嬪錛?br />鍘熷瀛楃涓詫細abcd1234
鍙崇Щ涓浣嶏細4abcd123
鍙崇Щ涓浣嶏細34abcd12
鍙崇Щ涓浣嶏細234abcd1
鍙崇Щ涓浣嶏細1234abcd
寰幆4嬈★紝鍒欏疄鐜頒簡鍙崇Щ4嬈?/p>
瀹炵幇鍑芥暟濡備笅錛?br />
浠庝笂闈㈢殑瀹炵幇浠g爜鍙互鐪嬪嚭錛?br />鐢變簬K %= N錛?鎵浠hile寰幆鐨凨鍊兼槸灝忎簬N鐨勩傛墍浠ユ椂闂村鏉傚害鏈澶т負O(N^2), 絀洪棿澶嶆潅搴︿負O(1)錛屼笉絎﹀悎棰樼洰瑕佹眰銆?/p>
鏂規硶浜岋細
瀵逛簬鍘熷瀛楃涓瞐bcd1234錛屽彸縐?浣嶅悗涓猴細34abcd12銆?br />閫氳繃姣旇緝鍙互鐪嬪嚭錛屾湁涓ゆ瀛愬瓧絎︿覆鐨勯『搴忔槸涓嶅彉鐨勩俛bcd12鍜?4銆?br />鍒欏彲鍙戠幇錛屽彸縐籏浣嶇殑榪囩▼灝辨槸鎶婃暟緇勭殑涓ら儴鍒嗕氦鎹㈢殑榪囩▼銆?/p>
渚嬪錛歛bcd12|34.
瀵筧bcd12閫嗗簭鎺掑垪錛?1dcba
瀵?4閫嗗簭鎺掑垪錛?nbsp; 43
瀵瑰叏閮ㄧ殑21dcba|43榪涜閫嗗簭鎺掑垪錛?4abcd21.
寰楀嚭濡備笅緇撹錛?br />灝嗗瓧絎︿覆S="abcd1234"鍒嗕負涓ら儴鍒哫="abcd12"鍜孻="34"銆傞偅涔圫=(X, Y)
X閫嗗簭璁頒負X'="21dcba"
Y閫嗗簭璁頒負Y'="43"
鍒?X', Y')="21dcba43"鏁翠綋鍐嶉嗗簭涓?34abcd12" = (Y, X)
鍗?X', Y')' = (Y, X)
浠g爜瀹炵幇濡備笅錛?/p>
璇ョ畻娉曞垯瀹炵幇浜嗗湪綰挎ф椂闂村唴瀹炵幇鍙崇Щ鎿嶄綔浜嗐?/p>
緙栧啓涓誨嚱鏁版祴璇曞涓嬶細
錛?span style="font-family: Calibri; ">1錛夋父鏍囩殑姒傚康
娓告爣鏄寚鍚戞煡璇㈢粨鏋滈泦鐨勪竴涓寚閽堬紝瀹冩槸涓涓氳繃瀹氫箟璇彞涓庝竴鏉?span style="font-family: Calibri; ">Select璇彞鐩稿叧鑱旂殑涓緇?span style="font-family: Calibri; ">SQL璇彞錛屽嵆浠庣粨鏋滈泦涓愪竴鐨勮鍙栦竴鏉¤褰曘傛父鏍囧寘鍚袱鏂歸潰鐨勫唴瀹癸細
●娓告爣緇撴灉闆嗭細鎵ц鍏朵腑鐨?span style="font-family: Calibri; ">Select璇彞鎵寰楀埌鐨勭粨鏋滈泦錛?/span>
●娓告爣浣嶇疆錛氫竴涓寚鍚戞父鏍囩粨鏋滈泦鍐呯殑鏌愪竴鏉¤褰曠殑鎸囬拡
鍒╃敤娓告爣鍙互鍗曠嫭鎿嶇旱緇撴灉闆嗕腑鐨勬瘡涓琛屻傛父鏍囧湪瀹氫箟浠ュ悗瀛樺湪涓ょ鐘舵侊細鍏抽棴鍜屾墦寮銆傚綋娓告爣鍏抽棴鏃訛紝鍏舵煡璇㈢粨鏋滈泦涓嶅瓨鍦紱鍙湁褰撴父鏍囨墦寮鏃訛紝鎵嶈兘鎸夎璇誨彇鎴栦慨鏀圭粨鏋滈泦涓殑鏁版嵁銆?/span>
錛?span style="font-family: Calibri; ">2錛夋祬璋堟父鏍?/span>
娓告爣鎴戜滑鍙互閫氫織鐨勮В閲婁負鍙樺姩鐨勬爣紺恒傛濡傚畠鐨勮В閲婁竴鏍鳳紝鏁版嵁搴撲腑鐨勬父鏍囧叾瀹炰篃鏄竴縐嶈鍙栨暟鎹殑鏂瑰紡銆備婦涓畝鍗曠殑渚嬪瓙鏉ヨ錛氭垜鏈変竴涓數璇濇湰錛岀數璇濇湰涓婄殑鍙風爜棣栧厛鏄寜鍦板煙鍒掑垎鐨勶紝鐜板湪鎴戞兂鎵句釜瀹朵綇寤婂潑鐨勬潕鍥涖傞鍏堟垜浠鍋氱殑鏄厛鎵懼埌寤婂潑鍦板尯鐨勭數璇濊〃錛屾壘鍒板悗鐨勮〃涔熷嵆鏄垜浠笂闈㈡墍璇寸殑娓告爣緇撴灉闆嗭紱鑰屼負浜嗘壘鍒版潕鍥涙垜浠彲鑳戒細鐢ㄦ墜涓鏉′竴鏉¢愯鐨勬壂榪囷紝浠ュ府鍔╂垜浠壘鍒版墍闇鐨勯偅鏉¤褰曘傚搴斾簬鏁版嵁搴撴潵璇達紝榪欏氨鏄父鏍囩殑妯″瀷銆傛墍浠ワ紝浣犲彲浠ヨ繖鏍鋒兂璞★細琛ㄦ牸鏄暟鎹簱涓殑琛紝鑰屾垜浠殑鎵嬪ソ姣旀槸娓告爣銆?/span>
鎬葷粨鏉ヨ娓告爣灝卞ソ姣旀槸鍦ㄧ數璇濇湰涓婇愪竴鎵弿鍙風爜鐨勬墜鎸囥?/span>
錛堜簩錛変嬌鐢ㄦ父鏍?/span>
涓涓簲鐢ㄧ▼搴忎腑鍙互浣跨敤涓ょ綾誨瀷鐨勬父鏍囷細鍓嶇錛堝鎴鳳級娓告爣鍜屽悗绔紙鏈嶅姟鍣級娓告爣錛屽畠浠槸涓や釜涓嶅悓鐨勬蹇點?/span>
浣嗘棤璁轟嬌鐢ㄥ摢縐嶆父鏍囷紝閮藉繀欏葷粡榪囧涓嬬殑姝ラ錛?/span>
●澹版槑娓告爣
●鎵撳紑娓告爣
●浠庢父鏍囦腑鎿嶄綔鏁版嵁
●鍏抽棴娓告爣
涓嬮潰鎴戜滑涓昏璁茶堪涓嬫湇鍔″櫒娓告爣錛?/span>
錛?span style="font-family: Calibri; ">1錛夊畾涔夋父鏍?/span>
浣跨敤娓告爣涔嬪墠蹇呴』鍏堝0鏄庡畠銆傚0鏄庢寚瀹氬畾涔夋父鏍囩粨鏋滈泦鐨勬煡璇€傞氳繃浣跨敤for update鎴?span style="font-family: Calibri; ">for read only鍏抽敭璇嶅皢娓告爣鏄懼紡瀹氫箟鎴愬彲鏇存柊鐨勬垨鍙鐨勩?/span>
Declare cursor_name cursor
For select_statement
[for{read only|update[of colum_name_list]}]
涓句緥錛?/span>
Declare company_crsr cursor
For select name,salary from company where salary>2000
For update of name,salary
涓婇潰鎴戜滑澹版槑浜嗕竴涓悕涓?span style="font-family: Calibri; ">company_crsr鐨勬父鏍囥?/span>
錛?span style="font-family: Calibri; ">2錛夋墦寮娓告爣
open鐨勮娉曚負錛?/span>
open 娓告爣鍚?/span>
鍦ㄥ0鏄庢父鏍囧悗錛屽繀欏繪墦寮瀹冧互渚跨敤fetch,update,delete璇誨彇銆佷慨鏀廣佸垹闄よ銆傚湪鎵撳紑涓涓父鏍囧悗錛屽畠灝嗚鏀懼湪娓告爣緇撴灉闆嗙殑棣栬鍓嶏紝蹇呴』鐢?span style="font-family: Calibri; ">fetch璇彞璁塊棶璇ラ琛屻?/span>
錛?span style="font-family: Calibri; ">3錛夎鍙栨父鏍囨暟鎹?/span>
鍦ㄥ0鏄庡茍鎵撳紑涓涓父鏍囧悗錛屽彲鐢?span style="font-family: Calibri; ">fetch鍛戒護浠庢父鏍囩粨鏋滈泦涓幏鍙栨暟鎹銆?/span>
Fetch鐨勮娉曚負錛?/span>
Fetch [[Next | Prior | First | Last | Absolute{n|@nvar} |Relative {n|@nvar}]
From] 娓告爣鍚?span style="font-family: Calibri; "> [into 鍙橀噺鍒楄〃]
鍙傛暟璇存槑錛?/span>
Next錛氳繑鍥炵粨鏋滈泦涓綋鍓嶈鐨勪笅涓琛岋紝濡傛灉璇ヨ鍙ユ槸絎竴嬈¤鍙栫粨鏋滈泦涓暟鎹垯榪斿洖鐨勬槸絎竴琛?/span>
Prior錛氳繑鍥炵粨鏋滈泦涓綋鍓嶈鐨勪笂涓琛岋紝濡傛灉璇ヨ鍙ユ槸絎竴嬈¤鍙栫粨鏋滈泦涓殑鏁版嵁鍒欐棤璁板綍緇撴灉榪斿洖騫舵妸娓告爣浣嶇疆璁劇疆涓虹涓琛屻?/span>
First錛氳繑鍥炴父鏍囩涓琛岋紱Last錛氳繑鍥炴父鏍囦腑鐨勬渶鍚庝竴琛岋紱
Absolute{n|@nvar}錛氬鏋?span style="font-family: Calibri; "> n 鎴?span style="font-family: Calibri; "> @nvar 涓烘鏁幫紝榪斿洖浠庢父鏍囧ご寮濮嬬殑絎?span style="font-family: Calibri; "> n 琛屽茍灝嗚繑鍥炵殑琛屽彉鎴愭柊鐨勫綋鍓嶈銆傚鏋?span style="font-family: Calibri; "> n 鎴?span style="font-family: Calibri; "> @nvar 涓鴻礋鏁幫紝榪斿洖娓告爣灝句箣鍓嶇殑絎?span style="font-family: Calibri; "> n 琛屽茍灝嗚繑鍥炵殑琛屽彉鎴愭柊鐨勫綋鍓嶈銆傚鏋?span style="font-family: Calibri; "> n 鎴?span style="font-family: Calibri; "> @nvar 涓?span style="font-family: Calibri; "> 0錛屽垯娌℃湁琛岃繑鍥炪?span style="font-family: Calibri; ">n 蹇呴』涓烘暣鍨嬪父閲忎笖 @nvar 蹇呴』涓?span style="font-family: Calibri; ">smallint銆?span style="font-family: Calibri; ">tinyint 鎴?span style="font-family: Calibri; "> int銆?/span>
RELATIVE {n | @nvar}錛氬鏋?span style="font-family: Calibri; "> n 鎴?span style="font-family: Calibri; "> @nvar 涓烘鏁幫紝榪斿洖褰撳墠琛屼箣鍚庣殑絎?span style="font-family: Calibri; "> n 琛屽茍灝嗚繑鍥炵殑琛屽彉鎴愭柊鐨勫綋鍓嶈銆傚鏋?span style="font-family: Calibri; "> n 鎴?span style="font-family: Calibri; "> @nvar 涓鴻礋鏁幫紝榪斿洖褰撳墠琛屼箣鍓嶇殑絎?span style="font-family: Calibri; "> n 琛屽茍灝嗚繑鍥炵殑琛屽彉鎴愭柊鐨勫綋鍓嶈銆傚鏋?span style="font-family: Calibri; "> n 鎴?span style="font-family: Calibri; "> @nvar 涓?span style="font-family: Calibri; "> 0錛岃繑鍥炲綋鍓嶈銆傚鏋滃娓告爣鐨勭涓嬈℃彁鍙栨搷浣滄椂灝?span style="font-family: Calibri; ">FETCH RELATIVE 鐨?span style="font-family: Calibri; "> n 鎴?span style="font-family: Calibri; "> @nvar 鎸囧畾涓鴻礋鏁版垨 0錛屽垯娌℃湁琛岃繑鍥炪?span style="font-family: Calibri; ">n 蹇呴』涓烘暣鍨嬪父閲忎笖@nvar 蹇呴』涓?span style="font-family: Calibri; "> smallint銆?span style="font-family: Calibri; ">tinyint 鎴?span style="font-family: Calibri; "> int銆?/span>
涓句緥錛?/span>
Fetch next
company_crsr into @name,@salary
SQL Server鍦ㄦ瘡嬈¤鍙栧悗榪斿洖涓涓姸鎬佸箋傚彲鐢?span style="font-family: Calibri; ">@@sql_status璁塊棶璇ュ鹼紝涓嬭〃緇欏嚭浜嗗彲鑳界殑@@sql_status鍊煎強鍏舵剰涔夈?/span>
鍊兼剰涔夛細
0——Fetch璇彞鎴愬姛
1——Fetch璇彞瀵艱嚧涓閿欒
2——緇撴灉闆嗘病鏈夋洿澶氱殑鏁版嵁錛屽綋鍓嶄綅緗綅浜庣粨鏋滈泦鏈鍚庝竴琛岋紝鑰屽鎴峰璇ユ父鏍囦粛鍙戝嚭Fetch璇彞鏃躲?/span>
鑻ユ父鏍囨槸鍙洿鏂扮殑錛屽彲鐢?span style="font-family: Calibri; ">update鍜?span style="font-family: Calibri; ">delete璇彞鏉ユ洿鏂板拰鍒犻櫎琛屻?/span>
鍒犻櫎娓告爣褰撳墠琛岀殑璇硶涓猴細
Delete [from] 琛ㄥ悕
where current of 娓告爣鍚?/span>
涓句緥錛?span style="font-family: Calibri; ">delete from authors where current of authors_crsr
褰撴父鏍囧垹闄や竴琛屽悗錛?span style="font-family: Calibri; ">SQL Server灝嗘父鏍囩疆浜庤鍒犻櫎琛岀殑鍓嶄竴琛屼笂銆?/span>
鏇存柊娓告爣褰撳墠琛岀殑璇硶涓猴細
update 琛ㄥ悕
set column_name1={expression1|NULL|(select_statement)}
[,column_name2={expression2|NULL|(select_statement)}
[……]
where current of 娓告爣鍚?/span>
涓句緥錛?/span>
update company
set name=”寮犱笁”,salary=”5000”
where current of company_crsr
錛?span style="font-family: Calibri; ">4錛夊叧闂父鏍?/span>
褰撶粨鏉熶竴涓父鏍囩粨鏋滈泦鏃訛紝鍙敤close鍏抽棴銆傝璇硶涓猴細
close 娓告爣鍚?/span>
鍏抽棴娓告爣騫朵笉鏀瑰彉鍏跺畾涔夛紝鍙敤open鍐嶆鎵撳紑銆傝嫢鎯蟲斁寮冩父鏍囷紝蹇呴』浣跨敤deallocate閲婃斁瀹冿紝deallocater鐨勮娉曚負錛?/span>
deallocater cursor 娓告爣鍚?/span>
deallocater璇彞閫氱煡SQL Server閲婃斁Declare璇彞浣跨敤鐨勫叡浜唴瀛橈紝涓嶅啀鍏佽鍙︿竴榪涚▼鍦ㄥ叾涓婃墽琛?span style="font-family: Calibri; ">Open鎿嶄綔銆?/span>
1錛塩ase琛ㄨ揪寮?nbsp; 鎴栬?/span>
2錛塪ecode鍑芥暟
鏉ュ疄鐜伴昏緫鍒ゆ柇銆?span style="font-family: 瀹嬩綋; ">Oracle鐨凞ECODE鍑芥暟鍔熻兘寰堝己錛岀伒媧昏繍鐢ㄧ殑璇濆彲浠ラ伩鍏嶅嬈℃壂鎻忥紝浠庤屾彁楂樻煡璇㈢殑鎬ц兘銆傝孋ASE鏄?i浠ュ悗鎻愪緵鐨勮娉曪紝榪欎釜璇硶鏇村姞鐨勭伒媧伙紝鎻愪緵浜咺F THEN ELSE鐨勫姛鑳姐?/span>
case琛ㄨ揪寮?/span>
case琛ㄨ揪寮忥紝鍙垎涓ょ錛岀畝鍗曞拰鎼滅儲錛岀畝鍗昪ase鍚庢帴琛ㄨ揪寮忥紝濡傦細
瀵逛簬綆鍗曠殑case闇瑕佸嚑鐐規敞鎰忥細
1錛夊鎵緒hen鐨勪紭鍏堢駭錛氫粠涓婂埌涓?/span>
2錛夊啀澶氱殑when錛屼篃鍙湁涓涓嚭鍙o紝鍗沖叾涓湁涓涓弧瓚充簡expr灝遍┈涓婇鍑篶ase
3錛変笉鑳芥妸return_expr鍜宔lse_expr鎸囧畾涓簄ull錛岃屼笖錛宔xpr銆乧omparison_expr鍜宺eturn_expr鐨勬暟鎹被鍨嬪繀欏葷浉鍚屻?/span>
鎼滅儲case錛?/span>
CASE WHEN condition THEN return_expr
[WHEN condition THEN return_expr]
...
ELSE else_expr
END
渚嬪瓙錛?/span>
鐢╠ecode鍙互榪濆弽絎?NF錛堣涓嶅彲鍐嶅垎錛屽垪涓嶅彲鍐嶅垎錛屽垪涓嶅彲閲嶅錛夛細鍒楅噸澶?/p>
涓涓瓧孌碉紝decode鍑芥暟鍙互瀹屽叏鏀瑰啓綆鍗昪ase錛?/span>
澶氫釜瀛楁錛岄渶瑕佸鏉傜殑case錛屾柟鍙?/span>
璇硶錛?br /> DECODE(value,if1,then1,if2,then2,if3,then3,...,else)錛岃〃紺哄鏋渧alue絳変簬if1鏃訛紝DECODE鍑芥暟鐨?/span>緇撴灉榪攖hen1,...,濡傛灉涓嶇瓑浜庝換浣曚竴涓猧f鍊鹼紝鍒欒繑鍥瀍lse銆傚彲浠ョ敤鍑芥暟鎴栬〃杈懼紡鏉ユ浛浠alue錛宨f錛?/span>then錛宔lse浠庤屼綔鍑轟竴浜涙洿鏈夌敤鐨勬瘮杈冦?/span>
鏉ョ湅鐪嬪叿浣撶殑榪愮敤錛?br /> 1 鍋囪鎴戜滑鎯崇粰鐧懼害鑱屽憳鍔犲伐璧勶紝鍏舵爣鍑嗘槸錛氬伐璧勫湪8000鍏冧互涓嬬殑灝嗗姞20錛咃紱宸ヨ祫鍦?000鍏冧互涓婄殑鍔?/span>15錛?br /> 鍒欙細
select decode(sign(salary - 8000),1,salary*1.15,-1,salary*1.2,salary) "revised_salary" from employee
2 琛╰able_subject錛屾湁subject_name鍒椼傝姹傛寜鐓э細璇佹暟銆佸鐨勯『搴忚繘琛屾帓搴?br /> 鍒欙細
select * from table_subject order by decode(subject_name, '璇枃', 1, '鏁板', 2, , '澶栬',3)
decode鍜岀畝鍗昪ase鐨勬ц兘姣旇緝
Oracle鐨凞ECODE鍑芥暟鍔熻兘寰堝己錛岀伒媧昏繍鐢ㄧ殑璇濆彲浠ラ伩鍏嶅嬈℃壂鎻忥紝浠庤屾彁楂樻煡璇㈢殑鎬ц兘銆傝孋ASE鏄?i浠ュ悗鎻愪緵鐨勮娉曪紝榪欎釜璇硶鏇村姞鐨勭伒媧伙紝鎻愪緵浜咺F THEN ELSE鐨勫姛鑳姐?/span>
瀵逛簬寰堝鎯呭喌錛孌ECODE鍜孋ASE閮借兘瑙e喅闂錛屼釜浜烘洿鍊懼悜浜庝嬌鐢―ECODE錛屼竴鏂歸潰鏄粠8i淇濈暀涓嬫潵鐨勪範鎯紝鍙︿竴鏂歸潰鏄疍ECODE鐨勮娉曟洿鍔犵殑綆媧侊紝浠g爜閲忚灝忎竴浜涖?/span>
涓嶈繃浠婂ぉ鍦ㄧ湅Oracle9i鐨勬暟鎹粨搴撴墜鍐屾椂鍙戠幇錛孫racle鍦ㄦ枃妗d腑鎻愬埌CASE璇彞鐨勬晥鐜囦細鏇撮珮涓浜涳紝灝ゅ叾鏄疌ASE琛ㄨ揪寮?nbsp;WHEN 甯擱噺 THEN鐨勮娉曪紝鏁堢巼瑕佹瘮CASE WHEN琛ㄨ揪寮?nbsp;THEN鐨勮娉曟洿楂樹竴浜涖傚浜庡悗闈㈣繖縐嶈娉曞掓槸娌℃湁澶鐨勭枒闂紝瀵逛簬CASE姣擠ECODE鏁堢巼楂樿繖縐嶈娉曞掓槸絎竴嬈$湅鍒幫紝鍗拌薄涓璂ECODE鏁堢巼寰堥珮錛屽簲璇ヤ笉浼氭瘮CASE鐨勬晥鐜囧樊銆?/span>
鍒板簳鏁堢巼濡備綍錛岃繕鏄鍏蜂綋鐨勫疄渚嬫潵璇達細
SQL> CREATE TABLE T AS
2 SELECT A.*
3 FROM DBA_OBJECTS A, DBA_MVIEWS;
Table created.
SQL> SELECT COUNT(*) FROM T;
COUNT(*)
----------
6075760
涓嬮潰媯鏌ECODE鍜屼袱縐岰ASE璇彞鐨勬晥鐜囷細
SQL> SET ARRAY 1000
SQL> SET TIMING ON
SQL> SET AUTOT TRACE
SQL> SELECT DECODE(OWNER, 'SYSTEM', 'SYSTEM', 'SYS', 'SYSTEM', 'USER')
2 FROM T;
6075760 rows selected.
Elapsed: 00:00:07.24
Execution Plan
----------------------------------------------------------
Plan hash value: 1601196873
--------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
--------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 4245K| 68M| 13828 (1)| 00:03:14 |
| 1 | TABLE ACCESS FULL| T | 4245K| 68M| 13828 (1)| 00:03:14 |
--------------------------------------------------------------------------
Note
-----
- dynamic sampling used for this statement
Statistics
----------------------------------------------------------
0 recursive calls
0 db block gets
47551 consistent gets
0 physical reads
0 redo size
46288564 bytes sent via SQL*Net to client
67317 bytes received via SQL*Net from client
6077 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
6075760 rows processed
SQL> SELECT CASE OWNER WHEN 'SYSTEM' THEN 'SYSTEM'
2 WHEN 'SYS' THEN 'SYSTEM'
3 ELSE 'USER' END
4 FROM T;
6075760 rows selected.
Elapsed: 00:00:07.22
Execution Plan
----------------------------------------------------------
Plan hash value: 1601196873
--------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
--------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 4245K| 68M| 13828 (1)| 00:03:14 |
| 1 | TABLE ACCESS FULL| T | 4245K| 68M| 13828 (1)| 00:03:14 |
--------------------------------------------------------------------------
Note
-----
- dynamic sampling used for this statement
Statistics
----------------------------------------------------------
0 recursive calls
0 db block gets
47551 consistent gets
0 physical reads
0 redo size
46288578 bytes sent via SQL*Net to client
67317 bytes received via SQL*Net from client
6077 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
6075760 rows processed
SQL> SELECT CASE WHEN OWNER = 'SYSTEM' THEN 'SYSTEM'
2 WHEN OWNER = 'SYS' THEN 'SYSTEM'
3 ELSE 'USER' END
4 FROM T;
6075760 rows selected.
Elapsed: 00:00:07.23
Execution Plan
----------------------------------------------------------
Plan hash value: 1601196873
--------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
--------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 4245K| 68M| 13828 (1)| 00:03:14 |
| 1 | TABLE ACCESS FULL| T | 4245K| 68M| 13828 (1)| 00:03:14 |
--------------------------------------------------------------------------
Note
-----
- dynamic sampling used for this statement
Statistics
----------------------------------------------------------
0 recursive calls
0 db block gets
47551 consistent gets
0 physical reads
0 redo size
46288585 bytes sent via SQL*Net to client
67317 bytes received via SQL*Net from client
6077 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
6075760 rows processed
select * from student_Info 榪欏彞鏄煡璇㈣〃
student_Info where student_ID = '" & Trim(txtSID.Text) & "'" 榪欏彞鏄瓫閫夋潯浠?鍏朵腑Trim錛堬級鏄幓鍓嶅悗絀烘牸錛宼xtSID.Text榪欎釜鎺т歡涓婅緭鍏ョ殑鍊箋?/span>
student_ID絳変簬浣犳帶浠朵笂杈撳叆鐨勫箋?/span>
ExecuteSQL(txtSQL, MsgText) 寰堟槑鏄炬槸鎵цSQL銆?nbsp;
ExecuteSQL鏄嚜瀹氫箟鍑芥暟銆?/span>
浼犻掑弬鏁癝QL浼犻掓煡璇㈣鍙ワ紝MsgString浼犻掓煡璇俊鎭傝嚜韜互涓涓暟鎹泦瀵硅薄鐨勫艦寮忚繑鍥?銆?/span>
涓瀹氭槸鎵цSQL璇彞錛岄噷闈㈢殑涓や釜鍙傛暟 txtSQL 鏄寚 鐢ㄦ潵鎵ц鐨凷QL璇彞 姣斿錛歟lect * from 琛?/span>
MsgText鍙傛暟 鎸囩殑鏄疄琛屽畬SQL璇彞鍚庣殑寮瑰嚭妗?鏄垚鍔熶簡榪樻槸澶辮觸浜嗕箣綾葷殑
絎竴鍙ョ殑鎰忔濆氨鏄細鏌ヨ瀛︾敓淇℃伅琛紝絳涢夊嚭瀛︾敓ID鍙蜂負txtSID.Text鐨勫鐢熴?/span>
絎簩鍙ョ殑鎰忔濇槸錛氭墽琛?span style="font-family: Calibri; ">sql璇彞錛屽茍鎶?span style="font-family: Calibri; ">MsgText
浣滀負鍙傛暟浼犻掕繘鍘伙紝榪斿洖涓涓?span style="font-family: Calibri; ">set綾誨瀷鐨勬暟鎹?/span>
涓懼垪錛?/span>
鍋囧鎴戞妸鎴戜滑鐝殑鎵鏈夌殑鍚屽鎺掓垚涓鍒楋紝绔欏湪絎竴浣嶇殑鍙風爜鏄?span style="font-family: Calibri; ">1錛屾帓鍦?span style="font-family: Calibri; ">1鍚庨潰鐨勫彿鐮佷負2錛屼互姝ょ被鎺ㄣ?/span>
絎竴鍙?span style="font-family: Calibri; ">sql鐨勬剰鎬濆氨鏄細鎴戠幇鍦ㄦ壘鍒頒竴涓悓瀛︽潕鍥涳紝鐒跺悗鍛婅瘔浠栬浠栨妸鍙風爜鏄?span style="font-family: Calibri; ">5鐨勫悓瀛︾粰鎵懼嚭鏉ャ?/span>
閭d箞榪欎釜鍚屽灝變細浠?span style="font-family: Calibri; ">1鏁板埌5錛屽氨鎶婂彿鐮佹槸5鐨勫悓瀛︾粰鎵句簡鍑烘潵銆?span style="font-family: Calibri; ">txtSQL灝辯浉褰撲簬鏉庡洓銆?/span>
浣嗘槸鏁版嵁搴撶殑sql鏌ヨ鏃墮氳繃绱㈠紩鏌ヨ鐨勶紝鍦ㄦ暟鎹簱涓笉鏄氳繃1,2,3,4,5鏁板埌5鎵嶆壘鍒扮殑銆傝屾槸閫氳繃绱㈠紩鐩存帴鎵懼埌鐨勩?/span>
涓句緥錛?/span>
鎴戞壘鐨勮繖涓悓瀛︽墜閲屼細鏈変竴涓悕鍗曪紝姣忎釜鍚嶅瓧鍓嶉兘鏈夊鍙楓傜洿鎺ュ彨瀛﹀彿瀵瑰簲鐨勫悕瀛楋紝榪欎釜浜哄氨琚壘鍒頒簡銆?/span>
榪欎釜瀛﹀彿灝辯浉褰撲簬绱㈠紩銆?/span>
鎴戣浠?span style="font-family: Calibri; ">student_info閲岄潰鎵句漢錛屼絾鏄紝榪欎釜浜虹殑ID蹇呴』鏄?span style="font-family: Calibri; ">txtSID.Text
渚嬪錛氭垜浠?span style="font-family: Calibri; ">5騫寸駭1鐝殑86涓漢涓壘浜猴紝鎴戝彧鎵句竴涓紝榪欎釜浜虹殑鍚嶅瓧鍙紶涓夛紙txtSID.Text錛?/span>
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