锘??xml version="1.0" encoding="utf-8" standalone="yes"?> 1.緙轟箯緇熶竴鐨勩佸叏闈㈢殑銆佺患鍚堢殑鍙樻洿綆$悊澶勭悊榪囩▼銆傝繖鏍峰彉鏇翠箣鍚庡彲鑳藉惉鍒拌繖鏍風殑鎶辨?#8220;鎴戠湡涓嶇煡閬撴偍鍋氫簡浠涔?#8221;錛屽鏋滄湁涓竴緇熶竴鐨勩佸叏闈㈢殑銆侀氱敤鐨勫彉鏇寸鐞嗘柟妗堟斁鍦ㄤ竴涓伐鍏蜂腑鎵ц錛屼綘浠皢浼氭秷闄よ繖縐嶆販涔?br />
2.緙轟箯瀵規瀯寤洪『搴忕殑鐞嗚В銆佺己涔忓浠g爜妯″潡鐨勬彁渚涜呭拰娑堣垂鑰呬箣闂寸殑鍚堝悓鐨勫畾涔夊拰寮哄埗銆佷互鍙婃瀯寤烘墍鍏鋒湁鐨勫畬鍏ㄧ殑鏁翠綋鎬э紝姝f槸涓涓嬭澶氶棶棰樺彂鐢熺殑鏍規簮錛氭棤娉曢噸鏂板惎鍔ㄦ瀯寤鴻繃紼嬨佹棤娉曞畬鎴愰儴鍒嗗彲闈犵殑鏋勫緩銆佹棤娉曡繘琛屾湁鏁堝湴嫻嬭瘯銆佹棤娉曞鍙樻洿(琛ヤ竵鍜屽崌綰?榪涜褰卞搷鍒嗘瀽錛岀瓑絳夈?br />
3.緙轟箯瀵規牴鏈殑緋葷粺瀵硅薄鐨勪緷璧栧叧緋葷殑鐞嗚В
As it can be manipulated on the server if
to send messages more than 512 byte.
]]>
鎬葷粨涓涓嬮棶棰橈紝甯屾湜鑳藉鏈夋墍甯姪錛?br />
1.JDK涓嬭澆錛歴un鎻愪緵linux涓嬬殑JDK鏈変袱縐嶏細涓縐嶇被浼紈indows鑷В鍘嬫枃浠?jdk-6u6-linux-i586.bin)錛屽彟涓縐嶉渶瑕佷互rpm鏂瑰紡瀹夎(jdk-6u5-linux-i586-rpm.bin)銆傛垜浣跨敤鐨勬槸鍓嶄竴縐嶏紝鎿嶄綔綆鍗曘?br />
2.涓嬭澆tomcat銆乪clipse
3.榪涘叆shell銆佹壘鍒頒笅杞絁DK鐨勫瓨鏀捐礬寰勶紝杈撳叆"./jdk-6u6-linux-i586.bin"錛岃繃紼嬩腑浼氭彁紺烘槸鍚﹀悓鎰忥紝杈撳叆"yes"錛岀瓑瀹夎瀹屾瘯浼氳嚜鍔ㄥ垱寤轟竴涓枃浠跺す錛屾垜榪欓噷鏄痡dk1.6.0_06錛屽畨瑁呯殑鏂囦歡閮芥斁鍦ㄨ繖涓洰褰曚笅錛宑d jdk1.6.0_06榪涘幓鐪嬩竴涓嬨傜劧鍚庝慨鏀?etc/environment錛岃緭鍏udo vi /etc/environment錛岄鍏堜慨鏀筆ATH錛屽湪鍓嶉潰澧炲姞"/home/鐢ㄦ埛鍚?jdk/jdk1.6.0_06/bin:.:"錛屽悗闈㈢殑"."琛ㄧず褰撳墠鐩綍銆傜劧鍚庡啀鏂囦歡鍚庨潰澧炲姞涓よ錛?br />
JAVA_HOME="/home/鐢ㄦ埛鍚?jdk/jdk1.6.0_06"
CLASSPATH="/home/鐢ㄦ埛鍚?jdk/jdk1.6.0_06/lib:."
export JAVA_HOME
export CLASSPATH
淇濆瓨閫鍑?br />
閲嶅惎Linux(Linux閲岄潰鍙互浣跨敤閲嶆柊鍔犺澆鐨勬柟娉曟潵鍔犺澆淇敼榪囩殑鏂囦歡錛屾湁鍏磋叮鍙互璇曡瘯)
榪涘叆Linux錛岃緭鍏ava -verison錛屾槸涓嶆槸鍑虹幇浜嗙啛鎮夌殑淇℃伅
榪欐椂鍙兘鍑虹幇鐨勪俊鎭拰浣犲畨瑁呯殑JDK鐗堟湰涓嶄竴鑷達紝鎴戜篃鏄榪欎釜闂鏁翠簡濂戒箙銆傚叾瀹炲湪浣犲畨瑁卽buntu榪囩▼涓紝鍙兘宸茬粡瑁呬簡涓涓狫RE浜嗭紝姝ゆ椂浣犲彲浠ラ氳繃鍛戒護"which java"錛屾煡鎵懼凡瀹夎鐨凧RE錛屽畠浼氭樉紺轟竴涓枃浠躲備嬌鐢?ls -l"鏌ョ湅榪欎釜鏂囦歡灞炴э紝浼氬彂鐜板畠鏄竴涓狶ink鏂囦歡錛岀劧鍚庝竴鐩?ls -l"鐩村埌鎵懼埌瀹冪殑鐪熷疄韜喚錛屾垜鍙戠幇瀹冩槸涓涓猵ackage錛歡ij1.4.2.浣跨敤sudo apt-get remove --purge gij1.4.2錛屽垹闄ゅ凡瀹夎鐨凧RE錛岃繃紼嬩細鍑虹幇涓涓彁紺猴紝杈撳叆"yes"鐒跺悗contitue銆傚畬鎴愪箣鍚庯紝閲嶅惎Linux錛岃緭鍏ava -version鏌ョ湅鏄惁瀹夎姝g‘銆?br />
tomcat瀹夎灝辯畝鍗曞緢澶氫簡錛岃緭鍏ar apache-tomcat-6.0.16.tar.gz灝辮В鍘嬩簡(鍦▁windows涓嬬洿鎺ヨВ鍘嬪氨鍙互浜?錛岃繘鍏pache-tomcat-6.0.16/bin錛屽惎鍔╯tartup.sh錛屽鏋滀嬌鐢╰erminal鍚姩錛屼細鍙戠幇鍚姩淇℃伅姣攚indows涓嬪皯寰堝錛岃繖涓嶄細褰卞搷浣跨敤錛屾墦寮firefox錛岃緭鍏?a >http://127.0.0.1:8080錛岀湅鍒版槸涓嶆槸鍑虹幇涓鍙尗鍜簡錛屽鏋滄槸閭e氨鎴愬姛浜嗐?br />
eclipse灝辨洿綆鍗曚簡錛岃В鍘嬪弻鍑誨氨ok浜嗐?/p>
]]>
4.鍦ㄦ暣涓紑鍙戝懆鏈熶腑閮芥櫘閬嶇己涔忓彲榪芥函鎬э紝娌℃湁涓縐嶆柟娉曞彲渚涚敤鏉ヨ拷韙鐞嗚繃紼嬪拰闇姹傝鐩栥傚叧浜庢祴璇曠殑鍙樻洿綆$悊澶勭悊榪囩▼鏄墜宸ョ殑鍜岃褰曚笉鑹殑銆傝繖浜涘彉鏇寸鐞嗗拰緇勪歡鐩稿叧鐨勭己鐐癸紝鎰忓懗鐫娌℃湁涓縐嶆柟娉曡兘澶熻繘琛屽彉鏇寸駭鍒殑褰卞搷鍒嗘瀽銆?br />
瀵逛簬浜у搧鍨嬬殑欏圭洰錛屽彉鏇存槸涓嶅彲閬垮厤鐨勶紝濡傛灉鍙樻洿鏄け璐ョ殑錛岄偅榪欎釜欏圭洰灝變細瓚婂仛瓚婇毦銆傚井杞殑xp緋葷粺鏄湁閭d箞澶氫漢寮鍙戠殑錛屽鏋滃xp鐨勬洿鏂板鐞嗘槸澶辮觸鐨勶紝閭e氨涓嶄細鏈塖P1銆丼P2鍜屽嵆灝嗘帹鍑虹殑SP3浜嗐?/p>
Exception |
Source |
Scope |
鑷畾涔夊紓甯稿悕縐?/span> |
浼氫駭鐢熻嚜瀹氫箟寮傚父鐨勬柟娉曟垨浜嬩歡 |
璋冪敤Source鐨勬柟娉曟垨瀵硅薄 |
鎴戣涓?/span>uncheckedException姣?/span>checkedException瑕佸ソ錛屽洜涓鴻繖鏍峰彲浠ュ噺灝戜唬鐮佷腑try/catch璇彞錛屽埄鐢ㄥ紓甯稿鐞嗘鏋?/span>(鎴?/span>filter)鏉ョ粺涓澶勭悊浜х敓鐨勫紓甯搞傞偅uncheckedException涓?/span>checkedException璇ュ浣曞垝鍒嗗憿錛?/span>checkedException鐢ㄦ潵澶勭悊鍙互棰勭煡鐨勬儏鍐碉紝渚嬪宸叉湁閽堝榪斿洖鍊肩殑涓嶅悓鎯呭喌錛岀敤If/else鍒ゆ柇銆傛鏃跺彲浠ョ敤checkedException鎻愰啋璋冪敤鑰呭涓嶅悓鐨勬儏鍐靛仛澶勭悊錛岃姣旇皟鐢ㄨ呰嚜宸辨煡婧愪唬鐮佺劧鍚庡仛鍑虹浉搴旂殑鍒ゆ柇瑕佸ソ銆?/span>uncheckedException鐢ㄤ簬鎶涘嚭鐨勫紓甯革紝涓鑸儏鍐典笅鏄笉鍙鐭ョ殑錛屼細瀵艱嚧緋葷粺閿欒鐨勩備緥濡備竴涓嚜瀹氫箟鐨勬柟娉曠敤鏉ユ牸寮忓寲鏃ユ湡錛屽畠闇瑕佷竴涓棩鏈熷瀷鐨勫瓧絎︿覆錛屽彲鏄亸鍋忕郴緇熶紶浜嗕竴涓┖鐨勫瓧孌典覆錛岃繖縐嶄簨寰堝皯鍙戠敓鐨勶紝鎵浠ヤ笉鑳芥姏鍑轟竴涓?/span>checkedException錛屼笉鐒朵細閫犳垚鍒板閮芥槸try/catch璇彞銆傛鏃?/span>uncheckedException灝卞彲浠ョ敤浜嗭紝鍦ㄦ柟娉曚笂鍔犱笂@throws uncheckedException錛岃皟鐢ㄨ呭湪涓嶈兘紜畾鑷繁浼犲叆鐨勫弬鏁版槸鍚﹀悎娉曟椂錛岀湅鍒版柟娉?/span>throw寮傚父錛屽氨闇瑕?/span>try/catch涓涓嬩簡銆?/span>(@throws鐢ㄦ潵璇存槑鐨勬槸uncheckedException)
鍦ㄩ」鐩紑鍙戣繃紼嬩腑錛岀敤XDoclet+Exception鏉ョ害鏉熻皟鐢ㄨ咃紝鏁堟灉浼氭洿濂戒竴浜涖?/span>
path:"涓嬮潰鏈変笁欏? 'Included'闇瑕佺紪璇戠殑(榛樿涓篈ll)錛?Excluded'涓嶉渶瑕佺紪璇戠殑(榛樿涓篘one)錛?Native library location'鏈湴搴撱備笅闈㈣繕鏈夎緗紪璇戝悗
鏂囦歡瀛樻斁鍦板潃銆傚嬀涓?Allow output folders for source folders"灝嗘樉紺虹殑瀹氫箟姣忎釜src緙栬瘧鍚庢枃浠跺瓨鏀懼湴鍧錛屼笉鍕句笂鍒欐瘡涓猻rc鐨勭紪璇戞枃浠墮兘瀛樻斁鍒板悓涓涓湴
鍧銆?/p>
Commons-Transaction: http://commons.apache.org/transaction/
涓嬮潰鏄祴璇曠殑浠g爜TestTransaction.java:
Log log = LogFactory.getLog(TestTransaction.class);
//榪欎釜鏄痗ommons-transaction鍖呬腑鐨勭被
LoggerFacade logger = new CommonsLoggingLogger(log);;
//瀛樺偍鐨勮礬寰?br />
String toDir = "d:/";
//涓存椂璺緞
String tempDir = "e:/";
//鏋勯犲嚱鏁扮殑絎笁涓弬鏁幫細false錛屾爣璇嗘槸鍚ncoding鏂囨。鐨剈rl錛岃繖涓竴鑸笉闇瑕佽緗負true
FileResourceManager frm = new FileResourceManager(toDir, tempDir, false, logger);
//榪欐爣璇唂rm鐨勭姸鎬佷負start
frm.start();
//涓嬮潰闇瑕乫rm鐨勭姸鎬佷負start
String txId = frm.generatedUniqueTxId();
try {
//寮鍚疶ransaction
frm.startTransaction(txId);
frm.deleteResource(txId, "RFID.rtf");
// throw new Exception("sdf");
} catch (Exception e) {
try {
//鍥炴粴浜嬪姟
frm.rollbackTransaction(txId);
} catch (ResourceManagerException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}
//鎻愪氦浜嬪姟
frm.commitTransaction(txId);
鍦ㄨ繖涓猘pplication榪愯榪囩▼涓紝浼氬湪tempDir浜х敓涓涓復鏃剁洰褰?鏄敱涓浜涢樋鎷変集鏁板瓧鍜屽瓧姣嶇粍鎴愮殑)錛岄噷闈㈡湁涓や釜鏂囦歡澶癸細change鍜宒elete錛岃繕鏈変竴涓棩蹇梩ransaction.log錛岃岃鎿嶄綔鐨勭洰褰曞氨浼氬湪delete鐩綍涓備簨鍔$殑榪囩▼涔熸槸榪欐牱鐨勶細鍏堝皢file瀛樻斁鐨則empDir錛岀劧鍚庣洃鎺ransaction鐨勭姸鎬侊紝濡傛灉commit錛屽畠灝變細灝唂ile鍐欏埌destination涓紝鐒跺悗鍒犻櫎tempDir銆備笉榪囷紝鏃㈢劧apache宸茬粡鏈変簡榪欎釜錛屽氨鍙互鐩存帴鎷挎潵鐢ㄤ簡.commons-transaction錛岃繕鏀寔jta鐨勪簨鍔★紝甯屾湜灝嗘潵浼氭洿鍔犲己澶?
1.緇濆鍊?br />
S:select abs(-1) value
O:select abs(-1) value from dual
2.鍙栨暣(澶?
S:select ceiling(-1.001) value
O:select ceil(-1.001) value from dual
3.鍙栨暣錛堝皬錛?br />
S:select floor(-1.001) value
O:select floor(-1.001) value from dual
4.鍙栨暣錛堟埅鍙栵級
S:select cast(-1.002 as int) value
O:select trunc(-1.002) value from dual
5.鍥涜垗浜斿叆
S:select round(1.23456,4) value 1.23460
O:select round(1.23456,4) value from dual 1.2346
6.e涓哄簳鐨勫箓
S:select Exp(1) value 2.7182818284590451
O:select Exp(1) value from dual 2.71828182
7.鍙杄涓哄簳鐨勫鏁?br />
S:select log(2.7182818284590451) value 1
O:select ln(2.7182818284590451) value from dual; 1
8.鍙?0涓哄簳瀵規暟
S:select log10(10) value 1
O:select log(10,10) value from dual; 1
9.鍙栧鉤鏂?br />
S:select SQUARE(4) value 16
O:select power(4,2) value from dual 16
10.鍙栧鉤鏂規牴
S:select SQRT(4) value 2
O:select SQRT(4) value from dual 2
11.姹備換鎰忔暟涓哄簳鐨勫箓
S:select power(3,4) value 81
O:select power(3,4) value from dual 81
12.鍙栭殢鏈烘暟
S:select rand() value
O:select sys.dbms_random.value(0,1) value from dual;
13.鍙栫鍙?br />
S:select sign(-8) value -1
O:select sign(-8) value from dual -1
----------涓夎鍑芥暟鐩稿叧
14.鍦嗗懆鐜?br />
S:SELECT PI() value 3.1415926535897931
O:涓嶇煡閬?/p>
15.sin,cos,tan 鍙傛暟閮戒互寮у害涓哄崟浣?br /> 渚嬪錛歴elect sin(PI()/2) value 寰楀埌1錛圫QLServer錛?/p>
16.Asin,Acos,Atan,Atan2 榪斿洖寮у害
17.寮у害瑙掑害浜掓崲(SQLServer錛孫racle涓嶇煡閬?
DEGREES錛氬姬搴?銆夎搴?br />
RADIANS錛氳搴?銆夊姬搴?/p>
---------鏁板奸棿姣旇緝
18. 姹傞泦鍚堟渶澶у?br />
S:select max(value) value from
(select 1 value
union
select -2 value
union
select 4 value
union
select 3 value)a
O:select greatest(1,-2,4,3) value from dual
19. 姹傞泦鍚堟渶灝忓?br />
S:select min(value) value from
(select 1 value
union
select -2 value
union
select 4 value
union
select 3 value)a
O:select least(1,-2,4,3) value from dual
20.濡備綍澶勭悊null鍊?F2涓殑null浠?0浠f浛)
S:select F1,IsNull(F2,10) value from Tbl
O:select F1,nvl(F2,10) value from Tbl
--------瀛楃涓插嚱鏁?/p>
21.姹傚瓧絎﹀簭鍙?br />
S:select ascii('a') value
O:select ascii('a') value from dual
22.浠庡簭鍙鋒眰瀛楃
S:select char(97) value
O:select chr(97) value from dual
23.榪炴帴
S:select '11'+'22'+'33' value
O:select CONCAT('11','22')||33 value from dual
23.瀛愪覆浣嶇疆 --榪斿洖3
S:select CHARINDEX('s','sdsq',2) value
O:select INSTR('sdsq','s',2) value from dual
23.妯$硦瀛愪覆鐨勪綅緗?--榪斿洖2,鍙傛暟鍘繪帀涓棿%鍒欒繑鍥?
// 鏈枃杞嚜 C++Builder 鐮旂┒ - http://www.ccrun.com/article.asp?i=996&d=dwn1rn
S:select patindex('%d%q%','sdsfasdqe') value
O:oracle娌″彂鐜幫紝浣嗘槸instr鍙互閫氳繃絎洓涓弬鏁版帶鍒跺嚭鐜版鏁?br />
select INSTR('sdsfasdqe','sd',1,2) value from dual 榪斿洖6
24.姹傚瓙涓?br />
S:select substring('abcd',2,2) value
O:select substr('abcd',2,2) value from dual
25.瀛愪覆浠f浛 榪斿洖aijklmnef
S:SELECT STUFF('abcdef', 2, 3, 'ijklmn') value
O:SELECT Replace('abcdef', 'bcd', 'ijklmn') value from dual
26.瀛愪覆鍏ㄩ儴鏇挎崲
S:Replace
O:select Translate('fasdbfasegas','fa','鎴? ) value from dual
27.闀垮害
S:len,datalength
O:length
28.澶у皬鍐欒漿鎹?lower,upper
29.鍗曡瘝棣栧瓧姣嶅ぇ鍐?br /> S:娌″彂鐜?br /> O:select INITCAP('abcd dsaf df') value from dual
30.宸﹁ˉ絀烘牸錛圠PAD鐨勭涓涓弬鏁頒負絀烘牸鍒欏悓space鍑芥暟錛?br />
S:select space(10)+'abcd' value
O:select LPAD('abcd',14) value from dual
31.鍙寵ˉ絀烘牸錛圧PAD鐨勭涓涓弬鏁頒負絀烘牸鍒欏悓space鍑芥暟錛?br />
S:select 'abcd'+space(10) value
O:select RPAD('abcd',14) value from dual
32.鍒犻櫎絀烘牸
S:ltrim,rtrim
O:ltrim,rtrim,trim
33. 閲嶅瀛楃涓?br />
S:select REPLICATE('abcd',2) value
O:娌″彂鐜?/p>
34.鍙戦煶鐩鎬技鎬ф瘮杈?榪欎袱涓崟璇嶈繑鍥炲間竴鏍鳳紝鍙戦煶鐩稿悓)
S:SELECT SOUNDEX ('Smith'), SOUNDEX ('Smythe')
O:SELECT SOUNDEX ('Smith'), SOUNDEX ('Smythe') from dual
SQLServer涓敤SELECT DIFFERENCE('Smithers', 'Smythers') 姣旇緝soundex鐨勫樊
榪斿洖0-4錛?涓哄悓闊籌紝1鏈楂?/p>
--------------鏃ユ湡鍑芥暟
35.緋葷粺鏃墮棿
S:select getdate() value
O:select sysdate value from dual
36.鍓嶅悗鍑犳棩
鐩存帴涓庢暣鏁扮浉鍔犲噺
37.姹傛棩鏈?br />
S:select convert(char(10),getdate(),20) value
O:select trunc(sysdate) value from dual
select to_char(sysdate,'yyyy-mm-dd') value from dual
38.姹傛椂闂?br />
S:select convert(char(8),getdate(),108) value
O:select to_char(sysdate,'hh24:mm:ss') value from dual
39.鍙栨棩鏈熸椂闂寸殑鍏朵粬閮ㄥ垎
S:DATEPART 鍜?DATENAME 鍑芥暟 錛堢涓涓弬鏁板喅瀹氾級
O:to_char鍑芥暟 絎簩涓弬鏁板喅瀹?/p>
鍙傛暟---------------------------------涓嬭〃闇瑕佽ˉ鍏?br />
year yy, yyyy
quarter qq, q (瀛e害)
month mm, m (m O鏃犳晥)
dayofyear dy, y (O琛ㄦ槦鏈?
day dd, d (d O鏃犳晥)
week wk, ww (wk O鏃犳晥)
weekday dw (O涓嶆竻妤?
Hour hh,hh12,hh24 (hh12,hh24 S鏃犳晥)
minute mi, n (n O鏃犳晥)
second ss, s (s O鏃犳晥)
millisecond ms (O鏃犳晥)
----------------------------------------------
40.褰撴湀鏈鍚庝竴澶?br /> S:涓嶇煡閬?br /> O:select LAST_DAY(sysdate) value from dual
41.鏈槦鏈熺殑鏌愪竴澶╋紙姣斿鏄熸湡鏃ワ級
S:涓嶇煡閬?br />
O:SELECT Next_day(sysdate,7) vaule FROM DUAL;
42.瀛楃涓茶漿鏃墮棿
S:鍙互鐩存帴杞垨鑰卻elect cast('2004-09-08'as datetime) value
O:SELECT To_date('2004-01-05 22:09:38','yyyy-mm-dd hh24-mi-ss') vaule FROM DUAL;
43.姹備袱鏃ユ湡鏌愪竴閮ㄥ垎鐨勫樊錛堟瘮濡傜錛?br />
S:select datediff(ss,getdate(),getdate()+12.3) value
O:鐩存帴鐢ㄤ袱涓棩鏈熺浉鍑忥紙姣斿d1-d2=12.3錛?br />
SELECT (d1-d2)*24*60*60 vaule FROM DUAL;
44.鏍規嵁宸兼眰鏂扮殑鏃ユ湡錛堟瘮濡傚垎閽燂級
S:select dateadd(mi,8,getdate()) value
O:SELECT sysdate+8/60/24 vaule FROM DUAL;
45.姹備笉鍚屾椂鍖烘椂闂?br /> S:涓嶇煡閬?br /> O:SELECT New_time(sysdate,'ydt','gmt' ) vaule FROM DUAL;
-----鏃跺尯鍙傛暟,鍖椾含鍦ㄤ笢8鍖哄簲璇ユ槸Ydt-------
AST ADT 澶цタ媧嬫爣鍑嗘椂闂?br />
BST BDT 鐧戒護嫻鋒爣鍑嗘椂闂?br />
CST CDT 涓儴鏍囧噯鏃墮棿
EST EDT 涓滈儴鏍囧噯鏃墮棿
GMT 鏍兼灄灝兼不鏍囧噯鏃墮棿
HST HDT 闃挎媺鏂姞鈥斿濞佸し鏍囧噯鏃墮棿
MST MDT 灞卞尯鏍囧噯鏃墮棿
NST 綰借姮鍏版爣鍑嗘椂闂?br />
PST PDT 澶鉤媧嬫爣鍑嗘椂闂?br />
YST YDT YUKON鏍囧噯鏃墮棿
Oracle鏀寔鐨勫瓧絎﹀嚱鏁板拰瀹冧滑鐨凪icrosoft SQL Server絳変環鍑芥暟:
鍑芥暟 Oracle Microsoft SQL銆Server
鎶婂瓧絎﹁漿鎹負ASCII ASCII ASCII
瀛椾覆榪炴帴 CONCAT (expression + expression)
鎶夾SCII杞崲涓哄瓧絎?CHR CHAR
榪斿洖瀛楃涓蹭腑鐨勫紑濮嬪瓧絎︼紙宸﹁搗錛?INSTR CHARINDEX
鎶婂瓧絎﹁漿鎹負灝忓啓 LOWER LOWER
鎶婂瓧絎﹁漿鎹負澶у啓 UPPER UPPER
濉厖瀛楃涓茬殑宸﹁竟 LPAD N/A
娓呴櫎寮濮嬬殑絀虹櫧 LTRIM LTRIM
娓呴櫎灝鵑儴鐨勭┖鐧?RTRIM RTRIM
瀛楃涓蹭腑鐨勮搗濮嬫ā寮忥紙pattern錛?INSTR PATINDEX
澶氭閲嶅瀛楃涓?RPAD REPLICATE
瀛楃涓茬殑璇煶琛ㄧず SOUNDEX SOUNDEX
閲嶅絀烘牸鐨勫瓧涓?RPAD SPACE
浠庢暟瀛楁暟鎹漿鎹負瀛楃鏁版嵁 TO_CHAR STR
瀛愪覆 SUBSTR SUBSTRING
鏇挎崲瀛楃 REPLACE STUFF
灝嗗瓧涓蹭腑鐨勬瘡涓瘝棣栧瓧姣嶅ぇ鍐?INITCAP N/A
緲昏瘧瀛楃涓?TRANSLATE N/A
瀛楃涓查暱搴?LENGTH DATELENGTH or LEN
鍒楄〃涓渶澶х殑瀛楃涓?GREATEST N/A
鍒楄〃涓渶灝忕殑瀛楃涓?LEAST N/A
濡傛灉涓篘ULL鍒欒漿鎹㈠瓧涓?NVL ISNULL
鏃ユ湡鍑芥暟
鍑芥暟 Oracle Microsoft SQL銆Server
鏃ユ湡鐩稿姞 (date column +/- value) or
ADD_MONTHS DATEADD
涓や釜鏃ユ湡鐨勫樊 (date column +/- value) or
MONTHS_BETWEEN DATEDIFF
褰撳墠鏃ユ湡鍜屾椂闂?SYSDATE GETDATE()
涓涓湀鐨勬渶鍚庝竴澶?LAST_DAY N/A
鏃跺尯杞崲 NEW_TIME N/A
鏃ユ湡鍚庣殑絎竴涓懆鏃?NEXT_DAY N/A
浠h〃鏃ユ湡鐨勫瓧絎︿覆 TO_CHAR DATENAME
浠h〃鏃ユ湡鐨勬暣鏁?TO_NUMBER
(TO_CHAR)) DATEPART
鏃ユ湡鑸嶅叆 ROUND CONVERT
鏃ユ湡鎴柇 TRUNC CONVERT
瀛楃涓茶漿鎹負鏃ユ湡 TO_DATE CONVERT
濡傛灉涓篘ULL鍒欒漿鎹㈡棩鏈?NVL ISNULL
杞崲鍑芥暟
鍑芥暟 Oracle Microsoft SQL銆Server
鏁板瓧杞崲涓哄瓧絎?TO_CHAR CONVERT
瀛楃杞崲涓烘暟瀛?TO_NUMBER CONVERT
鏃ユ湡杞崲涓哄瓧絎?TO_CHAR CONVERT
瀛楃杞崲涓烘棩鏈?TO_DATE CONVERT
16榪涘埗杞崲涓?榪涘埗 HEX_TO_RAW CONVERT
2榪涘埗杞崲涓?6榪涘埗 RAW_TO_HEX CONVERT
鍏跺畠琛岀駭鍒殑鍑芥暟
鍑芥暟 Oracle Microsoft SQL銆Server
榪斿洖絎竴涓潪絀鴻〃杈懼紡 DECODE COALESCE
褰撳墠搴忓垪鍊?CURRVAL N/A
涓嬩竴涓簭鍒楀?NEXTVAL N/A
濡傛灉exp1 = exp2, 榪斿洖null DECODE NULLIF
鐢ㄦ埛鐧誨綍璐﹀彿ID鏁板瓧 UID SUSER_ID
鐢ㄦ埛鐧誨綍鍚?USER SUSER_NAME
鐢ㄦ埛鏁版嵁搴揑D鏁板瓧 UID USER_ID
鐢ㄦ埛鏁版嵁搴撳悕 USER USER_NAME
褰撳墠鐢ㄦ埛 CURRENT_USER CURRENT_USER
鐢ㄦ埛鐜(audit trail) USERENV N/A
鍦–ONNECT BY瀛愬彞涓殑綰у埆 LEVEL N/A
鍚堣鍑芥暟
鍑芥暟 Oracle Microsoft SQL銆Server
Average AVG AVG
Count COUNT COUNT
Maximum MAX MAX
Minimum MIN MIN
Standard deviation STDDEV STDEV or STDEVP
Summation SUM SUM
Variance VARIANCE VAR or VARP
Oracle榪樻湁涓涓湁鐢ㄧ殑鍑芥暟EXTRACT,鎻愬彇騫朵笖榪斿洖鏃ユ湡鏃墮棿鎴栨椂闂撮棿闅旇〃杈懼紡涓壒瀹氱殑鏃墮棿鍩?
EXTRACT(YEAR FROM 鏃ユ湡)