锘??xml version="1.0" encoding="utf-8" standalone="yes"?>
]]>
聽
MS SQLSERVER
SQL Server 鏀寔涓存椂琛ㄣ備復鏃惰〃灝辨槸閭d簺鍚嶇О浠ヤ簳鍙?(#) 寮澶寸殑琛ㄣ傚鏋滃綋鐢ㄦ埛鏂紑榪炴帴鏃舵病鏈夐櫎鍘諱復鏃惰〃錛孲QL Server 灝嗚嚜鍔ㄩ櫎鍘諱復鏃惰〃銆備復鏃惰〃涓嶅瓨鍌ㄥ湪褰撳墠鏁版嵁搴撳唴錛岃屾槸瀛樺偍鍦ㄧ郴緇熸暟鎹簱 tempdb 鍐呫?
涓存椂琛ㄦ湁涓ょ綾誨瀷錛?
鏈湴涓存椂琛?/b>錛氭湰鍦頒復鏃惰〃鐨勫悕縐頒互鍗曚釜鏁板瓧絎﹀彿 (#) 鎵撳ご錛涘畠浠粎瀵瑰綋鍓嶇殑鐢ㄦ埛榪炴帴鏄彲瑙佺殑錛涘綋鐢ㄦ埛浠?Microsoft SQL Server 2000 瀹炰緥鏂紑榪炴帴鏃惰鍒犻櫎銆?
鍏ㄥ眬涓存椂琛?/b>錛氬叏灞涓存椂琛ㄧ殑鍚嶇О浠ユ暟瀛︾鍙?(##) 鎵撳ご錛屽垱寤哄悗瀵逛換浣曠敤鎴烽兘鏄彲瑙佺殑銆傚鏋滃湪鍒涘緩鍏ㄥ眬涓存椂琛ㄧ殑榪炴帴鏂紑鍓嶆病鏈夋樉寮忓湴闄ゅ幓榪欎簺琛紝閭d箞鍙鎵鏈夊叾瀹冧換鍔″仠姝㈠紩鐢ㄥ畠浠紝榪欎簺琛ㄥ嵆琚櫎鍘匯傚綋鍒涘緩鍏ㄥ眬涓存椂琛ㄧ殑榪炴帴鏂紑鍚庯紝鏂扮殑浠誨姟涓嶈兘鍐嶅紩鐢ㄥ畠浠傚綋鍓嶇殑璇彞涓鎵ц瀹岋紝浠誨姟涓庤〃涔嬮棿鐨勫叧鑱斿嵆琚櫎鍘伙紱鍥犳閫氬父鎯呭喌涓嬶紝鍙鍒涘緩鍏ㄥ眬涓存椂琛ㄧ殑榪炴帴鏂紑錛屽叏灞涓存椂琛ㄥ嵆琚櫎鍘匯?
渚嬪錛屽鏋滃垱寤哄悕涓?employees 鐨勮〃錛屽垯浠諱綍浜哄彧瑕佸湪鏁版嵁搴撲腑鏈変嬌鐢ㄨ琛ㄧ殑瀹夊叏鏉冮檺灝卞彲浠ヤ嬌鐢ㄨ琛紝闄ら潪瀹冨凡鍒犻櫎銆傚鏋滃垱寤哄悕涓?#employees 鐨勬湰鍦頒復鏃惰〃錛屽彧鏈夋?zhèn)ㄨ兘瀵硅琛ㄦ墽琛屾搷浣滀笖鍦ㄦ柇寮榪炴帴鏃惰琛ㄥ垹闄ゃ傚鏋滃垱寤哄悕涓?##employees 鐨勫叏灞涓存椂琛紝鏁版嵁琛ㄤ腑鐨勪換浣曠敤鎴峰潎鍙璇ヨ〃鎵ц鎿嶄綔銆傚鏋滆琛ㄥ湪鎮(zhèn)ㄥ垱寤哄悗娌℃湁鍏朵粬鐢ㄦ埛浣跨敤錛屽垯褰撴?zhèn)ㄦ柇寮榪炴帴鏃惰琛ㄥ垹闄ゃ傚鏋滆琛ㄥ湪鎮(zhèn)ㄥ垱寤哄悗鏈夊叾浠栫敤鎴蜂嬌鐢紝鍒?SQL Server鍦ㄦ墍鏈夌敤鎴鋒柇寮榪炴帴鍚庡垹闄よ琛ㄣ?
鐜板湪錛屼復鏃惰〃鐨勮澶氫紶緇熺敤閫斿彲鐢卞叿鏈?table 鏁版嵁綾誨瀷鐨勫彉閲忔浛鎹€?
聽
ORACLE
Oracle鏀寔涓存椂琛ㄣ備復鏃惰〃鐢ㄦ潵淇濆瓨浜嬪姟鎴栦細璇濇湡闂寸殑涓棿緇撴灉銆傚湪涓存椂琛ㄤ腑淇濆瓨鐨勬暟鎹彧鏈夊褰撳墠浼氳瘽鏄彲瑙佺殑錛屼換浣曚細璇濋兘涓嶈兘鐪嬪埌鍏朵粬浼氳瘽鐨勬暟鎹紝鍗充嬌鍦ㄥ綋鍓嶄細璇滳OMMIT鏁版嵁浠ュ悗涔熸槸涓嶅彲瑙佺殑銆傚鐢ㄦ埛騫惰涓嶆槸闂錛屼竴涓細璇濅粠鏉ヤ笉闃誨鍙︿竴涓細璇濅嬌鐢ㄤ復鏃惰〃銆傚嵆浣塊攣瀹氫復鏃惰〃錛屼竴涓細璇濅篃涓嶄細闃誨鍏朵粬浼氳瘽浣跨敤涓存椂琛ㄣ備復鏃惰〃姣旀甯歌〃浜х敓鐨凴EDO灝戝緱澶氾紝鐒惰岋紝鐢變簬涓存椂琛ㄥ繀欏諱駭鐢熷寘鍚暟鎹殑UNDO淇℃伅錛屾墍浠ヤ細浜х敓涓瀹氭暟閲忕殑REDO鏃ュ織銆?
涓存椂琛ㄥ皢浠庣敤鎴蜂復鏃惰〃絀洪棿鐨勭殑鐩墠鏃ュ織涓垎閰嶇┖闂達紝鎴栬呭鏋滀粠鏈夊畾涔夋潈鐨勭▼搴忎腑璁塊棶錛屽皢浣跨敤紼嬪簭鎵鏈夎呯殑涓存椂琛ㄧ┖闂淬傚叏灞涓存椂琛ㄥ疄闄呬笂鍙槸琛ㄦ湰韜殑妯℃澘銆傚垱寤轟復鏃惰〃鐨勮涓轟笉鍖呮嫭瀛樺偍絀洪棿鐨勫垎閰嶏紝涔熶笉鍖呮嫭INITIAL鐨勫垎閰嶃傚洜姝わ紝鍦ㄨ繍琛屾椂褰撲竴涓細璇濋鍏堝皢鏁版嵁鏀懼埌涓存椂琛ㄤ腑鏃訛紝榪欐椂灝嗗垱寤鴻繖涓細璇濈殑涓存椂孌點傜敱浜庢瘡涓細璇濊幏鍙栬嚜宸辯殑涓存椂孌碉紝姣忎釜鐢ㄦ埛鍙兘鍦ㄤ笉鍚岀殑琛ㄧ┖闂翠腑涓轟復鏃惰〃鍒嗛厤絀洪棿銆俇SER1鐨刣efault涓存椂琛ㄧ┖闂翠負TEMP1錛屼粬鐨勪復鏃惰〃灝嗕粠TEMP1涓垎閰嶇┖闂達紝USER2鐨刣efault涓存椂琛ㄧ┖闂翠負TEMP2錛屼粬鐨勪復鏃惰〃灝嗕粠TEMP2涓垎閰嶇┖闂淬?
涓存椂琛ㄥ湪姣忎釜鏁版嵁搴撲腑鍙渶鍒涘緩涓嬈★紝涓嶅繀鍦ㄦ瘡涓瓨鍌ㄨ繃紼嬩腑鍒涘緩銆備復鏃惰〃鎬繪槸瀛樺湪鐨勶紝闄ら潪鎵嬪姩鐨勫垹闄や粬銆備復鏃惰〃浣滀負瀵硅薄瀛樺湪鏁版嵁瀛楀吀涓紝騫朵笖鎬繪槸淇濇寔涓虹┖錛岀洿鍒版湁浼氳瘽鍦ㄥ叾涓斁鍏ユ暟鎹侽racle鍏佽鍒涘緩鍩轟簬涓存椂琛ㄧ殑瑙嗗浘鍜屽瓨鍌ㄨ繃紼嬨?
涓存椂琛ㄥ彲浠ユ槸浠ヤ細璇濅負鍩虹鐨勶紝涔熷彲浠ユ槸浠ヤ簨鍔′負鍩虹鐨勩侽N COMMIT PRESERVE ROWS瀛愬彞浣夸復鏃惰〃鎴愪負鍩轟簬浼氳瘽鐨勬ā寮忋傝灝嗙暀鍦ㄦ琛ㄤ腑錛岀洿鍒頒細璇濇柇寮鎴栭氳繃DELETE鎴朤RUNCATE浠庣墿鐞嗕笂鍒犻櫎榪欎簺琛屻侽N COMMIT DELETE ROWS瀛愬彞浣夸復鏃惰〃鎴愪負鍩轟簬浜嬪姟鐨勬ā寮忋傚綋浼氳瘽鎻愪氦鍚庯紝琛屾秷澶便傝繖涓復鏃惰〃鐨勮嚜鍔ㄦ竻闄よ繃紼嬩笉浼氭湁棰濆鐨勫紑閿銆?
鍦╫racle涓紝搴旂敤紼嬪簭闇瑕佺殑涓存椂琛ㄥ簲璇ュ湪紼嬪簭瀹夎鏃跺垱寤猴紝鑰屼笉鏄湪紼嬪簭榪愯鏃跺垱寤恒傦紙榪欐槸涓巑s sqlserver鎴杝ybase鐨勪嬌鐢ㄧ殑涓嶅悓錛?
鍦ㄤ換浣曟暟鎹簱涓紝涓存椂琛ㄧ殑涓涓己鐐規(guī)槸錛氫簨瀹炰笂浼樺寲鍣ㄥ湪涓存椂琛ㄤ腑娌℃湁鐪熸鐨勭粺璁″姛鑳姐傜劧鑰岋紝鍦╫racle涓紝涓緋誨垪杈冨ソ鐨勭粺璁$寽嫻嬪彲浠ラ氳繃DBMS_STATS鍖呭湪涓存椂琛ㄤ腑璁劇疆銆?
聽
DB2
鍙嬌鐢?DECLARE GLOBAL TEMPORARY TABLE 璇彞鏉ュ畾涔変復鏃惰〃銆侱B2鐨勪復鏃惰〃鏄熀浜庝細璇濈殑錛屼笖鍦ㄤ細璇濅箣闂存槸闅旂鐨勩傚綋浼氳瘽緇撴潫鏃訛紝涓存椂琛ㄧ殑鏁版嵁琚垹闄わ紝涓存椂琛ㄨ闅愬紡鍗鎬笅銆傚涓存椂琛ㄧ殑瀹氫箟涓嶄細鍦⊿YSCAT.TABLES涓嚭鐜?
涓嬮潰鏄畾涔変復鏃惰〃鐨勪竴涓ず渚嬶細
聽聽 DECLARE GLOBAL TEMPORARY TABLE gbl_temp
聽聽聽聽聽 LIKE empltabl
聽聽聽聽聽 ON COMMIT DELETE ROWS
聽聽聽聽聽 NOT LOGGED
聽聽聽聽聽 IN usr_tbsp
姝よ鍙ュ垱寤轟竴涓悕涓?gbl_temp 鐨勭敤鎴蜂復鏃惰〃銆傚畾涔夋鐢ㄦ埛涓存椂琛?鎵浣跨敤鐨勫垪鐨勫悕縐板拰璇存槑涓?empltabl 鐨勫垪鐨勫悕縐板拰璇存槑瀹屽叏鐩稿悓銆傞殣寮忓畾涔?鍙寘鎷垪鍚嶃佹暟鎹被鍨嬨佸彲涓虹┖鐗規(guī)у拰鍒楃己鐪佸煎睘鎬с傛湭瀹氫箟鎵鏈夊叾浠栧垪灞炴э紝鍖呮嫭鍞竴綰︽潫銆佸閮ㄥ叧閿瓧綰︽潫銆佽Е鍙戝櫒鍜岀儲寮曘傛墽琛?COMMIT 鎿嶄綔鏃訛紝 鑻ユ湭瀵硅琛ㄦ墦寮 WITH HOLD 娓告爣錛屽垯璇ヨ〃涓殑鎵鏈夋暟鎹兘琚垹闄ゃ備笉璁板綍 瀵圭敤鎴蜂復鏃惰〃鎵浣滅殑鏇存敼銆傜敤鎴蜂復鏃惰〃琚斁鍦ㄦ寚瀹氱殑鐢ㄦ埛涓存椂琛ㄧ┖闂翠腑銆傛琛ㄧ┖闂村繀欏誨瓨鍦紝鍚﹀垯姝よ〃鐨勫0鏄庡皢澶辮觸銆?
鎴峰畾涔変復鏃惰〃涓嶆敮鎸侊細
DATALINK 鍒?/font>
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涓夈佸鏁版嵁搴撶殑鑰冭檻
1.聽聽聽聽聽聽聽 瀛楃涓茶繛鎺ュ繀欏葷敤鈥?/span>||鈥濈鍙鳳紝涓嶄嬌鐢ㄢ?/span>+鈥濄傛敞鎰忥細鍦?/span>Oracle涓竴涓?/span>null鍊間笌闈?/span>null鍊艱繛鎺ワ紝緇撴灉涓洪潪null鍊鹼紝鍦?/span>DB2鍜?/span>SqlServer涓浉鍙嶃備嬌鐢?/span>nvl瀵?/span>null杞崲涓?/span>鈥欌欍?br />
2.聽聽聽聽聽聽聽 閫氶厤絎︿笉鑳戒嬌鐢ㄢ?/span>[a-c]%鈥?/font>榪欑褰㈠紡錛屽簲鍐欐垚濡傦細select * from table_name where col1 like 鈥榌a]%鈥?OR col1 like 鈥榌b]%鈥?OR col1 like 鈥榌c]%鈥?銆?br />
3.聽聽聽聽聽聽聽 鍦ㄥchar綾誨瀷姣旇緝鏃?/span>,瑕佸鍒楀姞涓?/span>rtrim()鍑芥暟,鍚﹀垯鍦?/span>Oracle涓笉浼氬緱鍒版紜粨鏋溿備緥濡傝嫢test琛ㄤ腑鐨勫瓧孌?/span>f1鐨勯暱搴︿負10錛屽唴鏈変竴涓間負鈥?/span>aa鈥?/font>錛岀殑綰綍錛屽垯璇彞select len(f1) from test;鍦?/span>SqlServer鐨勬墽琛岀粨鏋滀負2錛屽湪Oracle鐨勬墽琛岀粨鏋滀負10銆?br />
4.聽聽聽聽聽聽聽聽 鍦?/span>Case when璇彞涓彧鑳藉嚭鐜?/span> =銆?/span>>=銆?/span><= 浠ュ強is null榪愮畻絎︼紝涓嶈兘鍑虹幇 <銆?/span>>銆?/span><>銆?/span>!=銆佷互鍙?/span>is not null榪愮畻絎︺?/span>鍚﹀垯鍦?/span>Oracle鐨?/span>decode鍑芥暟鏃犳硶琛ㄨ揪銆?br />聽聽聽褰撳繀欏諱嬌鐢?/font> <, >, != 錛?/span>is not null鏃訛紝寤鴻閲囩敤濡備笅鍙橀氭柟娉曪細
聽聽聽聽聽聽聽聽聽 1錛変嬌鐢?/span> !=鏃訛細渚嬪聽聽 case聽 when聽 A!=B聽 then聽 e,
聽聽聽聽聽聽聽 鍙敼涓?/span>錛?/span>聽 case聽 A=b聽 then聽 e1聽 else聽 e聽聽 (闂存帴瀹炵幇 A!=B)
聽聽聽聽聽聽聽聽聽 2錛変嬌鐢?/span> < 鏃訛細渚嬪聽聽 case聽 when聽 A<B聽 then聽 e,
聽聽聽聽聽聽聽 鍙敼涓?/span>錛?/span>聽 case聽 A<=b聽 then聽 case A=B聽 then聽 e1聽 else聽 e聽 (闂存帴瀹炵幇 A<B)
聽聽聽聽聽聽聽 鎴?/span>聽聽聽 case聽 A>=b聽 then聽 e1聽 else聽 e聽聽聽 (闂存帴瀹炵幇 A<B)
聽聽聽聽聽聽聽聽聽 3錛変嬌鐢?/span> > 鏃訛細渚嬪聽聽 case聽 when聽 A>B聽 then聽 e,聽
聽聽聽聽聽聽聽 鍙敼涓?/span>錛?/span>聽 case聽 A>=b聽 then聽 case A=B聽 then 聽e1聽 else聽 e聽聽 (闂存帴瀹炵幇 A>B)
聽聽聽聽聽聽聽聽鎴?/span>聽聽聽 case聽 A<=b聽 then聽 e1聽 else聽 e聽聽聽 (闂存帴瀹炵幇 A>B)
聽聽聽聽聽聽聽聽聽聽4錛変嬌鐢?/span>is聽 not聽 null聽 鏃訛細渚嬪聽 case聽 when聽 A聽 is聽 not聽 null聽 then聽 e,
聽聽聽聽聽聽聽 鍙敼涓猴細聽 case聽 A聽聽 is聽 null聽 then聽 e1聽聽 else聽聽 e聽 (闂存帴瀹炵幇 A聽 is聽 not聽 null)
鐗瑰埆璇存槑錛氬綋鎵ц澶ф暟鎹噺鐨勬搷浣滄椂錛?/span>sql聽 Server聽 瀵?/span> case when 鐨勬墽琛屾晥鐜囨瀬浣庯紝鐢氳嚦鍙兘浼氭鏈猴紝鍥犳甯屾湜澶у灝介噺涓嶈浣跨敤case when銆?br />
5.聽聽聽聽聽聽聽 鍙備笌宸﹁繛鎺ョ殑鍒椾笉鑳戒負甯擱噺銆備緥濡傦紝涓嶅厑璁稿涓嬭鍙ワ細 select * from t1 left outer join t2 on t1.f1='A'銆?br />
6.聽聽聽聽聽聽聽 宸﹁繛鎺ョ殑鍐欐硶蹇呴』甯︹?/span>outer鈥濆叧閿瓧銆備緥濡傦細 select f1 from t1 left outer t2 on t1.f1 = t2.f1錛涜屼笉鏄細 select f1 from t1 left t2 on t1.f1 = t2.f1銆?br />
7.聽聽聽聽聽聽聽 鍙兘浣跨敤浠ヤ笅鍑芥暟錛屽瑕佷嬌鐢ㄦ柊鐨勫嚱鏁板繀欏葷敵鎶ワ紝瀹℃壒鍚庢墠鑳戒嬌鐢ㄣ傚嚱鏁幫細coalesce, cast, len, left, replace, right, substring, lower, upper, ltrim, rtrim, abs, acos, asin, atan, cos, ceiling, exp, floor, log, power, round, sign,sin, square, sqrt, tan, count, max, min, sum, avg銆?br />
8.聽聽聽聽聽聽聽 substring鍑芥暟涓搗濮嬩綅緗負1錛岃〃紺轟粠澶村紑濮嬨?br />
9.聽聽聽聽聽聽聽 Like 鐨勪竴杈瑰繀欏繪槸瀛楃涓詫紝鍙兘鍦ㄤ竴杈瑰嚭鐜拌〃鍒椼?br />
10.聽聽聽 鍦?/span>SQL璇彞涓笉鑳界洿鎺ヤ嬌鐢?/span>null,蹇呴』瀵?/span>null鎸囨槑綾誨瀷,鍦ㄥ垽鏂煇鍊間負null鏃墮櫎澶栥?br />
11.聽聽聽 瀵逛簬涓浜?/span>char/varchar鐨勫瓧孌電殑鍊鹼紝鍗充嬌鏄?/span>0,1錛?/span>2鈥?/font>絳夊鹼紝涔熷繀欏昏〃杈句負鈥?chmetcnv tcsc="0" numbertype="1" negative="False" hasspace="False" sourcevalue="0" unitname="鈥? w:st="on">0鈥?鈥?chmetcnv tcsc="0" numbertype="1" negative="False" hasspace="False" sourcevalue="1" unitname="鈥? w:st="on">1鈥?鈥?chmetcnv tcsc="0" numbertype="1" negative="False" hasspace="False" sourcevalue="2" unitname="鈥? w:st="on">2鈥欌β?br />
12.聽聽聽 鍦?/span>cast鍜?/span>convert璇彞涓彧鏀寔鍒板瓧絎﹀瀷銆佹棩鏈熷瀷鍜屾暟瀛楀瀷鐨勮漿鎹紝涓旀棩鏈熷瀷鍙敮鎸?/span>UFDate鐨勬牸寮忥紝鍗?/span>鈥橸YYY鈥?鈥楳M鈥?鈥楧D鈥櫬?br />
13.聽聽聽 insert 璇彞涓嶉氳繃SQL緲昏瘧鍣紝鍦?/span>insert涓笉鍏佽浣跨敤select銆?br />
14.聽聽聽 涓嶈兘閫氳繃鏉?/span>percent聽 n 闄愬埗鏌ヨ緇撴灉闆嗙殑璁板綍鏁幫紝涔熶笉鑳戒嬌鐢?/span> select聽 top n 鐨勮鍙?br />
15.聽聽聽聽 outer join 鍓嶅悗鐨勮〃涓嶈兘浜掔浉榪炴帴,涓嶈兘閲嶅榪炴帴錛屽嵆涓嶈兘鍑虹幇浠ヤ笅褰㈠紡鐨勮鍙ワ細
聽聽聽聽聽聽聽聽聽聽 a聽 left outer join c on a.fda=c.fdsf聽 left outer join b on b.fdsa=c.fsdff聽 (璇ヨ鍙ヤ腑琛?/span>a銆?/span>b鍚屾椂榪炴帴鍒頒簡琛?/span>c涓?/span>)
聽聽聽聽聽聽聽聽聽聽聽聽 a聽 left outer join b on a.fda=b.fdsf聽 left outer join a on b.fdsa=a.fsdff聽 (璇ヨ鍙ヤ腑琛?/span>a銆?/span>b浜掕仈)
16.聽聽聽 join 涓?/span>on 蹇呴』涓ユ牸鍖歸厤錛屼笉鍏佽鍑虹幇娌℃湁on鐨?/span>join銆?br />
17.聽聽聽 join鈥n 鍚庨潰鎱庣敤 or,濡傛灉鐢ㄥ埌錛岃鎶?/span>or鐨勮寖鍥寸敤( )鎷搗鏉?br />
18.聽聽聽 濡傛灉鏌愪釜琛ㄦ湁鍒悕錛屽垯蹇呴』寮曠敤瀹冪殑鍒悕錛屼笉璁稿紩鐢ㄥ畠鍘熸潵鐨勮〃鍚?br />
19.聽聽聽聽鍦ㄥ瓙鏌ヨ涓墠鍚庡繀欏誨姞涓婃嫭鍙?br />
20.聽聽 order by 鍚庣殑鍒楀悕鍦?/span>select鍚庢湁澶氫釜鐩稿悓鐨勫垪錛屼緥濡備笉鑳藉啓涓猴細
聽聽聽聽聽select a, b, a, a聽 from fdsf聽 order by a聽 (a 鍦?span lang="EN-US">select鍚庡嚭鐜頒簡澶氭)鍙互緇?span lang="EN-US">a 鍔犲埆鍚?br />
21.聽聽聽 涓嶈兘浣跨敤select into 鐨勬牸寮?br />
22.聽聽聽 緇欐煇涓瓧絎﹀瀷鐨勫垪璧嬪兼椂錛屽鏋滃叾鍊煎惈鏈夊崟寮曞彿錛屼緥濡傦細set聽 col=鈥檉sdf鈥檉dsfdsf鈥檚df鈥欌? 鏈変袱縐嶈В鍐蟲柟妗?
聽聽聽聽聽聽1錛夊皢鍗曞紩鍙峰啓鎴?span lang="EN-US">鈥欌?鍗?/font>聽 set聽 col=鈥檉sdf鈥欌檉dsfdsf鈥欌檚df鈥?br />聽聽聽聽聽聽聽 2錛夐氳繃set鐨勬柟寮忚祴鍊鹼紝鍗籌細set聽 col= 錛?鈥?br />聽聽聽聽聽聽聽聽聽聽 鐒跺悗錛?/font>setString(8,鈥?鈥檉sdf鈥檉dsfdsf鈥檚df鈥欌?
]]>
涓銆佹榪?br />
鏈墜鍐屼晶閲嶄簬
SQL
寮鍙戜功鍐欒繃紼嬩腑鐨勮鑼冮棶棰樸傚敖鍙兘鐨勫湪鎬葷粨浠ュ線寮鍙戣繃紼嬩腑褰㈡垚鐨?/span>
SQL
寮鍙戞柟娉曪紝騫墮拡瀵瑰湪杞歡緇存姢銆?/span>
SQL
璇彞璺ㄥ鏁版嵁搴撱佹搷浣滅郴緇熼傞厤涓嚭鐜伴棶棰樼殑瑙e喅鍔炴硶鐨勫熀紜涓婏紝鎻愬嚭鐨勪竴涓?/span>
SQL
寮鍙戣鑼冦?br />
浜屻佷功鍐欓鏍?br />
1.
SQL
璇彞鍏ㄩ儴浣跨敤灝忓啓錛岄櫎鍦?/span>
SQL
涓敤寮曞彿鎷搗鏉ョ殑甯擱噺澶栵紝璇蜂嬌鐢ㄥ崟瀛楄妭銆?br />
2.聽
寮曠敤瀛楃鏃剁敤鍗曞紩鍙楓傚錛?/span>
update testable set idcol=鈥檃bcd鈥?/font>
銆?/span>
3.聽
灝介噺浣跨敤
prepareStatement
錛屽埄鐢ㄩ澶勭悊鍔熻兘銆傚皯鐢?/span>
createStatement
銆?br />
4.聽鍦?/font>
鎷艱
SQL
鐨勬椂鍊欙紝浣跨敤
StringBuffer,
涓嶈鐢?/span>
String+String
鐨勬柟寮忋?br />
5.聽
涓ョ浣跨敤
select * 鈥︹?
褰㈠紡鐨勮鍙ワ紝瑕佹寚鍑?/span>
select
鐨勫叿浣撳瓧孌點?br />
6.聽
涓ョ浣跨敤
insert into table value(?????)
錛岃鎸囧嚭鍏蜂綋瑕佽祴鍊肩殑瀛楁銆?/span>
7.聽
SQL
璇彞鍖呭惈澶氳〃榪炴帴鏃訛紝蹇呴』瀵規(guī)瘡涓〃鍛藉悕鍒悕錛屽姣忎釜瀛楁鐨勪嬌鐢ㄩ兘瑕佸甫涓婂埆鍚嶃?br />
8.
褰?/span>
SQL
璇彞鍚湁榪愮畻絎︽椂錛岃繍綆楃闇涓庡叾浠栧瓧絎︿覆鐢ㄧ┖鏍煎尯鍒?/span>
(
鎴栬呯敤鎷彿鍒嗗紑
)
銆傚惁鍒欏鏄撳鑷翠互涓嬬被浼奸棶棰樸傚湪璇彞
select a鈥揵 from table
涓紝
a
錛?/span>
b
鍧囦負鍙橀噺銆傛嫾鍐欒璇彞鏃訛紝濡傛灉
a=6
錛?/span>
b= -3
錛屽垯璇彞鍙樹負
select 6--3 from table
銆?/span>
--
鍙樹負
Sql
鐨勬敞閲婏紝璇彞鎶ラ敊銆?br />
9.
閬垮厤闅愬惈鐨勭被鍨嬭漿鎹€備緥濡傚湪
where
瀛愬彞涓?/span>
numeric
鍨嬪拰
int
鍨嬬殑鍒楃殑姣旇緝鎴栫浉鍔犮?br />
10.聽
璇誨彇鏄寚閫氳繃
JDBC
璇誨埌鐨勬暟鎹牸寮忥紝淇濆瓨鏄寚淇濆瓨鍦?/span>
VO
涓殑鏁版嵁鏍煎紡錛屾彃鍏ユ垨鑰呮洿鏂版槸鎸?/span>
insert
鎴栬?/span>
update
璇彞涓殑鏁版嵁鏍煎紡銆?br />
聽聽聽 a)聽聽
鏁村瀷瀛楁錛氳鍙栨椂鏍規(guī)嵁瀛楁璁劇疆淇濆瓨涓?/span>
Integer
鎴栬?/span>
Long
銆?br />
聽聽聽 b)聽聽
鏁板瓧鍨嬪瓧孌碉細璇誨彇涓?/span>
BigDecimal
錛屽茍淇濆瓨涓?/span>
UFDouble
錛屾彃鍏ユ垨鑰呮洿鏂版椂涓?/span>
BigDecimal
銆?br />
聽聽聽 c)聽聽
瀛楃鍨嬪瓧孌碉細璇誨彇涓?/span>
String
錛屽茍淇濆瓨涓?/span>
String
錛屾彃鍏ユ垨鑰呮洿鏂頒負
String
銆?br />
聽聽聽 d)聽聽
甯冨皵鍨嬪瓧孌碉細璇誨彇涓?/span>
String(鈥榊鈥?OR 鈥楴鈥?
錛屽茍淇濆瓨涓?/span>
UFBoolean
錛屾彃鍏ユ垨鑰呮洿鏂版椂涓?/span>
String(鈥榊鈥?OR 鈥楴鈥?
銆?br />
聽聽聽 e)聽聽
鏃墮棿瀛楁錛氳鍙栦負
String
錛屽茍淇濆瓨涓?/span>
UFDateTime
錛屾彃鍏ユ垨鑰呮洿鏂版椂鐨勬椂闂存牸寮忕敱涓棿浠剁粺涓澶勭悊錛屾湁鍗曠嫭闇姹傜殑瑕佺敵璇峰悗鎵嶈兘鍐沖畾銆?br />
聽聽
11.聽
灝介噺涓嶄嬌鐢ㄥ彸榪炴帴銆?br />
12.聽
鍦ㄤ嬌鐢?/span>
UNION
鎴?/span>
UNION聽 ALL
鐨勫墠鍚庣殑涓や釜
SQL
闇瑕佸姞
( )
銆?/font>