锘??xml version="1.0" encoding="utf-8" standalone="yes"?>自拍偷自拍亚洲精品偷一,亚洲美女视频一区,亚洲系列国产精品制服丝袜第http://www.tkk7.com/bang/category/51164.htmlzh-cnTue, 25 Sep 2012 05:02:43 GMTTue, 25 Sep 2012 05:02:43 GMT60PowerDesigner瀵煎嚭琛ㄥ埌wordhttp://www.tkk7.com/bang/archive/2012/09/24/388452.html閭?/dc:creator>閭?/author>Mon, 24 Sep 2012 10:12:00 GMThttp://www.tkk7.com/bang/archive/2012/09/24/388452.htmlhttp://www.tkk7.com/bang/comments/388452.htmlhttp://www.tkk7.com/bang/archive/2012/09/24/388452.html#Feedback0http://www.tkk7.com/bang/comments/commentRss/388452.htmlhttp://www.tkk7.com/bang/services/trackbacks/388452.html

涓銆佹ā鐗堜慨鏀?/p>

鍦ㄥ鍑鴻〃鏃訛紝powerdesigner榛樿涓烘垜浠彁渚涗簡寰堝鐨勬ā鐗堬紝鍦ㄥ伐鍏鋒爮涓夋嫨銆怰eport--->Report Template銆戝嵆鍙湅鍒版墍鏈夌殑榛樿妯$増銆傚鍥句竴錛?/p>

鍥句竴 妯$増鍒楄〃

榪欓噷鎴戜滑涓轟簡瀵煎嚭powerdesigner涓垱寤虹殑琛紝鍦ㄥ伐鍏鋒爮涓夋嫨銆怰eport--->Reports銆?蹇嵎閿瓹trl+E),鐒跺悗鍒涘緩涓涓狽ew Report,濡備笅鍥句簩鎵浠ワ紝閫夋嫨Standard Physical Report錛岃繖閲岄夋嫨鐨勬爣鍑嗙殑妯$増錛岀偣鍑籓K紜畾銆?/p>

鍥句簩 鍒涘緩鏂扮殑Report

浠庡伐鍏鋒爮銆怰eport--->Print Preview銆戞垨鑰呯偣鍑誨浘鏍?img style="border-right-width: 0px; border-top-width: 0px; border-bottom-width: 0px; border-left-width: 0px" alt="" src="http://pic002.cnblogs.com/images/2011/28023/2011042411342378.png" />鍚屾牱鍙互棰勮瀵煎嚭鍒皐ord鐨勬晥鏋滀簡銆傛晥鏋滃鍥句笁鎵紺猴細

鍥句笁 瀵煎嚭鍒皐ord涓瑙堟晥鏋?/p>

浠庛愬浘涓夈戜腑鐨勫伐鍏鋒爮閲岄潰HTM鍜孯TF涓ょ瀵煎嚭鏍煎紡銆傚鏋滃鍑哄埌word閫夋嫨RTF鏍煎紡鍗沖彲錛屼絾鏄垜浠粠銆愬浘涓夈戜腑鐪嬪嚭綰㈣壊鏍囧嚭鐨勯儴鍒嗭紝1 鏄痺ord鐨勯〉鐪夛紝鍚屾牱榪樻湁欏佃剼淇℃伅 錛? 鏄竴浜涘垪鐨勫睘鎬ф竻鍗曘?/p>

銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆

鍥懼洓 璁劇疆欏電湁銆侀〉鑴?/p>

鍦ㄣ愬浘鍥涖戜腑錛岄夋嫨Header/Footer鍚庯紝鍒犳帀Header閲岄潰鐨?MODULE% %MODELNAME%錛屽垹鎺塅ooter閲岄潰鐨?APPNAME% %DATE% 欏墊暟 %PAGE%錛孶ser_defined footer灝變細鑷姩鍕句笂錛岃繖鏍峰氨鍘繪帀浜嗛〉鐪夈侀〉鑴氫簡

 

榪樻湁鍏朵粬鐨勬瘮濡傝〃鍓嶉潰鐨勮嚜澧炲簭鍙鳳紝絎竴欏典腑鐨勫垱寤鴻呫佺増鏈佹棩鏈熶俊鎭篃涓嶉渶瑕侊紝鎴戜滑鍙互榪涜閰嶇疆鍘繪帀錛屽涓嬨愬浘浜斻戙愬浘鍏?/p>

銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆

  銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆鍥懼洓 

銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆銆鍥句簲 Properties閰嶇疆

鍦ㄥ浘浜斾腑錛屽湪榛樿閰嶇疆涓?General)鍕句笂No paragraph numbering鍗沖彲鍙栨秷琛ㄥ墠闈㈢殑鑷搴忓彿錛屽湪Title Page涓夋嫨 No Title Page灝變笉浼氱敓鎴愮涓欏典腑鍏充簬鍒涘緩鑰呫佺増鏈佹棩鏈熺瓑淇℃伅銆?/p>

鍦ㄣ愬浘涓夈戜腑錛岄瑙堢湅鍒扮殑鍐呭澶錛屽氨蹇呴』鍒犻櫎涓浜涙垜浠笉闇瑕佺殑鍐呭錛岀粡榪囧垹鍑忎箣鍚庯紝濡備笅銆愬浘鍏戞墍紺?/p>

鍥懼叚 

鍦ㄣ愬浘鍏戜腑鍙抽敭鍗曞嚮銆怢ist of Table Columns - 琛?lt;%PARENT%>鍒楄鏄庛戯紝浠庤彍鍗曚腑閫夋嫨 Edit Title...錛屽氨鍙互緙栬緫鎴愮幇鍦ㄦ垜浠凡鐪嬪埌鐨勩傜劧鍚庯紝鍦ㄥ彸閿彍鍗曚腑閫夋嫨Layout...錛岄夋嫨鎴戜滑鎵闇瑕佹樉紺虹殑鍐呭,Code琛ㄧず鍒楀悕縐幫紝涓鑸敤鑻辨枃鍗曡瘝鎴栨嫾闊沖瓧姣嶈〃紺猴紝Name涓鑸敤涓枃鎻忚堪錛孌ata Type 琛ㄧず鏁版嵁綾誨瀷錛孋omment琛ㄧず瀛楁澶囨敞鎴栧瓧孌佃鏄庣瓑銆?/p>

鍒版鍩烘湰涓婂凡緇忓畬鎴愪簡powerdesigner妯$増鐨勪慨鏀?/p>

浜屻佸鍑鴻〃

鐒跺悗鐐瑰嚮[Report---->Generate RTF]瀵煎嚭鍒皐ord涓紝鏈鍚庢垜浠湅鐪嬪鍑哄埌word鐨勬晥鏋滐紝濡備笅鍥撅細

鍥句竷 瀵煎嚭鍒皐ord鏁堟灉

涓夈佷繚瀛樻ā鐗?/p>

      閫氳繃涓婃枃錛屾垜浠畬鎴愪簡鑷繁鎵闇鐨勬ā鐗堬紝鐒跺悗灝變繚瀛橈紝浠ュ悗鍙互鐩存帴浣跨敤鍗沖彲錛屽湪宸ュ叿鏍忎腑[Report--->Create Template From Section]錛岀劧鍚嶤trl+S灝變細瑕佹眰淇濆瓨錛屽彇鍚嶄繚瀛樺嵆鍙?/p>

]]>
MySQL鎬ц兘浼樺寲http://www.tkk7.com/bang/archive/2012/03/19/372193.html閭?/dc:creator>閭?/author>Mon, 19 Mar 2012 06:50:00 GMThttp://www.tkk7.com/bang/archive/2012/03/19/372193.htmlhttp://www.tkk7.com/bang/comments/372193.htmlhttp://www.tkk7.com/bang/archive/2012/03/19/372193.html#Feedback0http://www.tkk7.com/bang/comments/commentRss/372193.htmlhttp://www.tkk7.com/bang/services/trackbacks/372193.html1. 涓烘煡璇㈢紦瀛樹紭鍖栦綘鐨勬煡璇?/span>

澶у鏁扮殑MySQL鏈嶅姟鍣ㄩ兘寮鍚簡鏌ヨ緙撳瓨銆傝繖鏄彁楂樻ф渶鏈夋晥鐨勬柟娉曚箣涓錛岃屼笖榪欐槸琚?/span>MySQL鐨勬暟鎹簱寮曟搸澶勭悊鐨勩傚綋鏈夊緢澶氱浉鍚岀殑鏌ヨ琚墽琛屼簡澶氭鐨勬椂鍊欙紝榪欎簺鏌ヨ緇撴灉浼氳鏀懼埌涓涓紦瀛樹腑錛岃繖鏍鳳紝鍚庣畫鐨勭浉鍚岀殑鏌ヨ灝變笉鐢ㄦ搷浣滆〃鑰岀洿鎺ヨ闂紦瀛樼粨鏋滀簡銆?/span>

 

榪欓噷鏈涓昏鐨勯棶棰樻槸錛屽浜庣▼搴忓憳鏉ヨ錛岃繖涓簨鎯呮槸寰堝鏄撹蹇界暐鐨勩傚洜涓猴紝鎴戜滑鏌愪簺鏌ヨ璇彞浼氳MySQL涓嶄嬌鐢ㄧ紦瀛樸傝鐪嬩笅闈㈢殑紺轟緥錛?/span>

1 // 鏌ヨ緙撳瓨涓嶅紑鍚?/span>

2 $r = mysql_query("SELECT username FROM user WHERE signup_date >= CURDATE()");

3   

4 // 寮鍚煡璇㈢紦瀛?/span>

5 $today = date("Y-m-d");

6 $r = mysql_query("SELECT username FROM user WHERE signup_date >= '$today'");

涓婇潰涓ゆ潯SQL璇彞鐨勫樊鍒氨鏄?/span> CURDATE() 錛?/span>MySQL鐨勬煡璇㈢紦瀛樺榪欎釜鍑芥暟涓嶈搗浣滅敤銆傛墍浠ワ紝鍍?/span> NOW() 鍜?/span> RAND() 鎴栨槸鍏跺畠鐨勮濡傛綾葷殑SQL鍑芥暟閮戒笉浼氬紑鍚煡璇㈢紦瀛橈紝鍥犱負榪欎簺鍑芥暟鐨勮繑鍥炴槸浼氫笉瀹氱殑鏄撳彉鐨勩傛墍浠ワ紝浣犳墍闇瑕佺殑灝辨槸鐢ㄤ竴涓彉閲忔潵浠f浛MySQL鐨勫嚱鏁幫紝浠庤屽紑鍚紦瀛樸?/span>

2. 褰撳彧瑕佷竴琛屾暟鎹椂浣跨敤 LIMIT 1

褰撲綘鏌ヨ琛ㄧ殑鏈変簺鏃跺欙紝浣犲凡緇忕煡閬撶粨鏋滃彧浼氭湁涓鏉$粨鏋滐紝浣嗗洜涓轟綘鍙兘闇瑕佸幓fetch娓告爣錛屾垨鏄綘涔熻浼氬幓媯鏌ヨ繑鍥炵殑璁板綍鏁般?/span>

 

鍦ㄨ繖縐嶆儏鍐典笅錛屽姞涓?/span> LIMIT 1 鍙互澧炲姞鎬ц兘銆傝繖鏍蜂竴鏍鳳紝MySQL鏁版嵁搴撳紩鎿庝細鍦ㄦ壘鍒頒竴鏉℃暟鎹悗鍋滄鎼滅儲錛岃屼笉鏄戶緇線鍚庢煡灝戜笅涓鏉$鍚堣褰曠殑鏁版嵁銆?/span>

 

涓嬮潰鐨勭ず渚嬶紝鍙槸涓轟簡鎵句竴涓嬫槸鍚︽湁“涓浗”鐨勭敤鎴鳳紝寰堟槑鏄撅紝鍚庨潰鐨勪細姣斿墠闈㈢殑鏇存湁鏁堢巼銆傦紙璇鋒敞鎰忥紝絎竴鏉′腑鏄?/span>Select *錛岀浜屾潯鏄?/span>Select 1錛?/span>

01 // 娌℃湁鏁堢巼鐨勶細

02 $r = mysql_query("SELECT * FROM user WHERE country = 'China'");

03 if (mysql_num_rows($r) > 0) {

04     // ...

05 }

06   

07 // 鏈夋晥鐜囩殑錛?/span>

08 $r = mysql_query("SELECT 1 FROM user WHERE country = 'China' LIMIT 1");

09 if (mysql_num_rows($r) > 0) {

10     // ...

11 }

3. 鍗冧竾涓嶈 ORDER BY RAND()

鎯蟲墦涔辮繑鍥炵殑鏁版嵁琛岋紵闅忔満鎸戜竴涓暟鎹紵鐪熶笉鐭ラ亾璋佸彂鏄庝簡榪欑鐢ㄦ硶錛屼絾寰堝鏂版墜寰堝枩嬈㈣繖鏍風敤銆備絾浣犵‘涓嶄簡瑙h繖鏍峰仛鏈夊涔堝彲鎬曠殑鎬ц兘闂銆?/span>

 

濡傛灉浣犵湡鐨勬兂鎶婅繑鍥炵殑鏁版嵁琛屾墦涔變簡錛屼綘鏈?/span>N縐嶆柟娉曞彲浠ヨ揪鍒拌繖涓洰鐨勩傝繖鏍蜂嬌鐢ㄥ彧璁╀綘鐨勬暟鎹簱鐨勬ц兘鍛堟寚鏁扮駭鐨勪笅闄嶃傝繖閲岀殑闂鏄細MySQL浼氫笉寰椾笉鍘繪墽琛?/span>RAND()鍑芥暟錛堝緢鑰?/span>CPU鏃墮棿錛夛紝鑰屼笖榪欐槸涓轟簡姣忎竴琛岃褰曞幓璁拌錛岀劧鍚庡啀瀵瑰叾鎺掑簭銆傚氨綆楁槸浣犵敤浜?/span>Limit 1涔熸棤嫻庝簬浜嬶紙鍥犱負瑕佹帓搴忥級

 

涓嬮潰鐨勭ず渚嬫槸闅忔満鎸戜竴鏉¤褰?/span>

1 // 鍗冧竾涓嶈榪欐牱鍋氾細

2 $r = mysql_query("SELECT username FROM user ORDER BY RAND() LIMIT 1");

3   

4 // 榪欒浼氭洿濂斤細

5 $r = mysql_query("SELECT count(*) FROM user");

6 $d = mysql_fetch_row($r);

7 $rand = mt_rand(0,$d[0] - 1);

8   

9 $r = mysql_query("SELECT username FROM user LIMIT $rand, 1");

4. 閬垮厤 SELECT *

浠庢暟鎹簱閲岃鍑鴻秺澶氱殑鏁版嵁錛岄偅涔堟煡璇㈠氨浼氬彉寰楄秺鎱€傚茍涓旓紝濡傛灉浣犵殑鏁版嵁搴撴湇鍔″櫒鍜?/span>WEB鏈嶅姟鍣ㄦ槸涓ゅ彴鐙珛鐨勬湇鍔″櫒鐨勮瘽錛岃繖榪樹細澧炲姞緗戠粶浼犺緭鐨勮礋杞姐?/span>

 

鎵浠ワ紝浣犲簲璇ュ吇鎴愪竴涓渶瑕佷粈涔堝氨鍙栦粈涔堢殑濂界殑涔犳儻銆?/span>

1 // 涓嶆帹鑽?/span>

2 $r = mysql_query("SELECT * FROM user WHERE user_id = 1");

3 $d = mysql_fetch_assoc($r);

4 echo "Welcome {$d['username']}";

5   

6 // 鎺ㄨ崘

7 $r = mysql_query("SELECT username FROM user WHERE user_id = 1");

8 $d = mysql_fetch_assoc($r);

9 echo "Welcome {$d['username']}";

5. 姘歌繙涓烘瘡寮犺〃璁劇疆涓涓狪D

鎴戜滑搴旇涓烘暟鎹簱閲岀殑姣忓紶琛ㄩ兘璁劇疆涓涓?/span>ID鍋氫負鍏朵富閿紝鑰屼笖鏈濂界殑鏄竴涓?/span>INT鍨嬬殑錛堟帹鑽愪嬌鐢?/span>UNSIGNED錛夛紝騫惰緗笂鑷姩澧炲姞鐨?/span>AUTO_INCREMENT鏍囧織銆?/span>

 

灝辯畻鏄綘 users 琛ㄦ湁涓涓富閿彨 email”鐨勫瓧孌碉紝浣犱篃鍒瀹冩垚涓轟富閿備嬌鐢?/span> VARCHAR 綾誨瀷鏉ュ綋涓婚敭浼氫嬌鐢ㄥ緱鎬ц兘涓嬮檷銆傚彟澶栵紝鍦ㄤ綘鐨勭▼搴忎腑錛屼綘搴旇浣跨敤琛ㄧ殑ID鏉ユ瀯閫犱綘鐨勬暟鎹粨鏋勩?/span>

 

鑰屼笖錛屽湪MySQL鏁版嵁寮曟搸涓嬶紝榪樻湁涓浜涙搷浣滈渶瑕佷嬌鐢ㄤ富閿紝鍦ㄨ繖浜涙儏鍐典笅錛屼富閿殑鎬ц兘鍜岃緗彉寰楅潪甯擱噸瑕侊紝姣斿錛岄泦緹わ紝鍒嗗尯……

 

鍦ㄨ繖閲岋紝鍙湁涓涓儏鍐墊槸渚嬪錛岄偅灝辨槸“鍏寵仈琛?#8221;鐨?#8220;澶栭敭”錛屼篃灝辨槸璇達紝榪欎釜琛ㄧ殑涓婚敭錛岄氳繃鑻ュ共涓埆鐨勮〃鐨勪富閿瀯鎴愩傛垜浠妸榪欎釜鎯呭喌鍙仛“澶栭敭”銆傛瘮濡傦細鏈変竴涓?#8220;瀛︾敓琛?#8221;鏈夊鐢熺殑ID錛屾湁涓涓?#8220;璇劇▼琛?#8221;鏈夎紼?/span>ID錛岄偅涔堬紝“鎴愮嘩琛?#8221;灝辨槸“鍏寵仈琛?#8221;浜嗭紝鍏跺叧鑱斾簡瀛︾敓琛ㄥ拰璇劇▼琛紝鍦ㄦ垚緇╄〃涓紝瀛︾敓ID鍜岃紼?/span>ID鍙?#8220;澶栭敭”鍏跺叡鍚岀粍鎴愪富閿?/span>

 

6. 浣跨敤 ENUM 鑰屼笉鏄?VARCHAR

ENUM 綾誨瀷鏄潪甯稿揩鍜岀揣鍑戠殑銆傚湪瀹為檯涓婏紝鍏朵繚瀛樼殑鏄?/span> TINYINT錛屼絾鍏跺琛ㄤ笂鏄劇ず涓哄瓧絎︿覆銆傝繖鏍蜂竴鏉ワ紝鐢ㄨ繖涓瓧孌墊潵鍋氫竴浜涢夐」鍒楄〃鍙樺緱鐩稿綋鐨勫畬緹庛?/span>

 

濡傛灉浣犳湁涓涓瓧孌碉紝姣斿“鎬у埆”錛?#8220;鍥藉”錛?#8220;姘戞棌”錛?#8220;鐘舵?#8221;鎴?#8220;閮ㄩ棬”錛屼綘鐭ラ亾榪欎簺瀛楁鐨勫彇鍊兼槸鏈夐檺鑰屼笖鍥哄畾鐨勶紝閭d箞錛屼綘搴旇浣跨敤 ENUM 鑰屼笉鏄?/span> VARCHAR銆?/span>

 

MySQL涔熸湁涓涓?#8220;寤鴻”錛堣絎崄鏉★級鍛婅瘔浣犳庝箞鍘婚噸鏂扮粍緇囦綘鐨勮〃緇撴瀯銆傚綋浣犳湁涓涓?/span> VARCHAR 瀛楁鏃訛紝榪欎釜寤鴻浼氬憡璇変綘鎶婂叾鏀規垚 ENUM 綾誨瀷銆備嬌鐢?/span> PROCEDURE ANALYSE() 浣犲彲浠ュ緱鍒扮浉鍏崇殑寤鴻銆?/span>

7. 灝藉彲鑳界殑浣跨敤 NOT NULL

闄ら潪浣犳湁涓涓緢鐗瑰埆鐨勫師鍥犲幓浣跨敤 NULL 鍊鹼紝浣犲簲璇ユ繪槸璁╀綘鐨勫瓧孌典繚鎸?NOT NULL銆傝繖鐪嬭搗鏉ュソ鍍忔湁鐐逛簤璁紝璇峰線涓嬬湅銆?/span>

棣栧厛錛岄棶闂綘鑷繁“Empty”鍜?#8220;NULL”鏈夊澶х殑鍖哄埆錛堝鏋滄槸INT錛岄偅灝辨槸0鍜孨ULL錛夛紵濡傛灉浣犺寰楀畠浠箣闂存病鏈変粈涔堝尯鍒紝閭d箞浣犲氨涓嶈浣跨敤NULL銆傦紙浣犵煡閬撳悧錛熷湪 Oracle 閲岋紝NULL 鍜?Empty 鐨勫瓧絎︿覆鏄竴鏍風殑錛?

涓嶈浠ヤ負 NULL 涓嶉渶瑕佺┖闂達紝鍏墮渶瑕侀澶栫殑絀洪棿錛屽茍涓旓紝鍦ㄤ綘榪涜姣旇緝鐨勬椂鍊欙紝浣犵殑紼嬪簭浼氭洿澶嶆潅銆傚綋鐒訛紝榪欓噷騫朵笉鏄浣犲氨涓嶈兘浣跨敤NULL浜嗭紝鐜板疄鎯呭喌鏄緢澶嶆潅鐨勶紝渚濈劧浼氭湁浜涙儏鍐典笅錛屼綘闇瑕佷嬌鐢∟ULL鍊箋?/span>

8. 鎶奍P鍦板潃瀛樻垚 UNSIGNED INT

寰堝紼嬪簭鍛橀兘浼氬垱寤轟竴涓?VARCHAR(15) 瀛楁鏉ュ瓨鏀懼瓧絎︿覆褰㈠紡鐨処P鑰屼笉鏄暣褰㈢殑IP銆傚鏋滀綘鐢ㄦ暣褰㈡潵瀛樻斁錛屽彧闇瑕?涓瓧鑺傦紝騫朵笖浣犲彲浠ユ湁瀹氶暱鐨勫瓧孌點傝屼笖錛岃繖浼氫負浣犲甫鏉ユ煡璇笂鐨勪紭鍔匡紝灝ゅ叾鏄綋浣犻渶瑕佷嬌鐢ㄨ繖鏍風殑WHERE鏉′歡錛欼P between ip1 and ip2銆?/span>

鎴戜滑蹇呴渶瑕佷嬌鐢║NSIGNED INT錛屽洜涓?IP鍦板潃浼氫嬌鐢ㄦ暣涓?2浣嶇殑鏃犵鍙鋒暣褰€?/span>

鑰屼綘鐨勬煡璇紝浣犲彲浠ヤ嬌鐢?INET_ATON() 鏉ユ妸涓涓瓧絎︿覆IP杞垚涓涓暣褰紝騫朵嬌鐢?INET_NTOA() 鎶婁竴涓暣褰㈣漿鎴愪竴涓瓧絎︿覆IP

9. 鎷嗗垎澶х殑 DELETE 鎴?INSERT 璇彞

濡傛灉浣犻渶瑕佸湪涓涓湪綰跨殑緗戠珯涓婂幓鎵ц涓涓ぇ鐨?/span> DELETE 鎴?/span> INSERT 鏌ヨ錛屼綘闇瑕侀潪甯稿皬蹇冿紝瑕侀伩鍏嶄綘鐨勬搷浣滆浣犵殑鏁翠釜緗戠珯鍋滄鐩稿簲銆傚洜涓鴻繖涓や釜鎿嶄綔鏄細閿佽〃鐨勶紝琛ㄤ竴閿佷綇浜嗭紝鍒殑鎿嶄綔閮借繘涓嶆潵浜嗐?/span>

濡傛灉浣犳妸浣犵殑琛ㄩ攣涓婁竴孌墊椂闂達紝姣斿30縐掗挓錛岄偅涔堝浜庝竴涓湁寰堥珮璁塊棶閲忕殑绔欑偣鏉ヨ錛岃繖30縐掓墍縐瘡鐨勮闂繘紼?/span>/綰跨▼錛屾暟鎹簱閾炬帴錛屾墦寮鐨勬枃浠舵暟錛屽彲鑳戒笉浠呬粎浼氳浣犳硦WEB鏈嶅姟Crash錛岃繕鍙兘浼氳浣犵殑鏁村彴鏈嶅姟鍣ㄩ┈涓婂畷鏈恒?/span>

 

鎵浠ワ紝濡傛灉浣犳湁涓涓ぇ鐨勫鐞嗭紝浣犲畾浣犱竴瀹氭妸鍏舵媶鍒嗭紝浣跨敤 LIMIT 鏉′歡鏄竴涓ソ鐨勬柟娉曘備笅闈㈡槸涓涓ず渚嬶細

01 while (1) {

02     //姣忔鍙仛1000鏉?/span>

03     mysql_query("DELETE FROM logs WHERE log_date <= '2009-11-01' LIMIT 1000");

04     if (mysql_affected_rows() == 0) {

05         // 娌″緱鍙垹浜嗭紝閫鍑猴紒

06         break;

07     }

08     // 姣忔閮借浼戞伅涓浼氬効

09     usleep(50000);

10 }

10. 瓚婂皬鐨勫垪浼氳秺蹇?/h4>

瀵逛簬澶у鏁扮殑鏁版嵁搴撳紩鎿庢潵璇達紝紜洏鎿嶄綔鍙兘鏄渶閲嶅ぇ鐨勭摱棰堛傛墍浠ワ紝鎶婁綘鐨勬暟鎹彉寰楃揣鍑戜細瀵硅繖縐嶆儏鍐甸潪甯告湁甯姪錛屽洜涓鴻繖鍑忓皯浜嗗紜洏鐨勮闂?/span>

濡傛灉涓涓〃鍙細鏈夊嚑鍒楃艦浜嗭紙姣斿璇村瓧鍏歌〃錛岄厤緗〃錛夛紝閭d箞錛屾垜浠氨娌℃湁鐞嗙敱浣跨敤 INT 鏉ュ仛涓婚敭錛屼嬌鐢?MEDIUMINT, SMALLINT 鎴栨槸鏇村皬鐨?TINYINT 浼氭洿緇忔祹涓浜涖?/span>

 



]]>楂樻晥鐨凪ySQL鍒嗛〉http://www.tkk7.com/bang/archive/2012/03/19/372192.html閭?/dc:creator>閭?/author>Mon, 19 Mar 2012 06:46:00 GMThttp://www.tkk7.com/bang/archive/2012/03/19/372192.htmlhttp://www.tkk7.com/bang/comments/372192.htmlhttp://www.tkk7.com/bang/archive/2012/03/19/372192.html#Feedback0http://www.tkk7.com/bang/comments/commentRss/372192.htmlhttp://www.tkk7.com/bang/services/trackbacks/372192.html棣栧厛鐪嬩竴涓嬪垎欏電殑鍩烘湰鍘熺悊錛?/p>

mysql> explain SELECT * FROM message ORDER BY id DESC LIMIT 10000, 20\G
***************** 1. row **************
id: 1
select_type: SIMPLE
table: message
type: index
possible_keys: NULL
key: PRIMARY
key_len: 4
ref: NULL
rows: 10020
Extra:
1 row in set (0.00 sec)

limit 10000,20鐨勬剰鎬濇壂鎻忔弧瓚蟲潯浠剁殑10020琛岋紝鎵旀帀鍓嶉潰鐨?0000琛岋紝榪斿洖鏈鍚庣殑20琛岋紝闂灝卞湪榪欓噷錛屽鏋滄槸limit 100000,100錛岄渶瑕佹壂鎻?00100琛岋紝鍦ㄤ竴涓珮騫跺彂鐨勫簲鐢ㄩ噷錛屾瘡嬈℃煡璇㈤渶瑕佹壂鎻忚秴榪?0W琛岋紝鎬ц兘鑲畾澶ф墦鎶樻墸銆?/p>

涓縐?#8221;clue”鐨勫仛娉曪紝緇欑炕欏墊彁渚涗竴浜?#8221;綰跨儲”錛屾瘮濡傝繕鏄疭ELECT * FROM message ORDER BY id DESC錛屾寜id闄嶅簭鍒嗛〉錛屾瘡欏?0鏉★紝褰撳墠鏄10欏碉紝褰撳墠欏墊潯鐩甶d鏈澶х殑鏄?527錛屾渶灝忕殑鏄?500錛屽鏋滄垜浠彧鎻愪緵”涓婁竴欏?#8221;銆?#8221;涓嬩竴欏?#8221;榪欐牱鐨勮煩杞紙涓嶆彁渚涘埌絎琋欏電殑璺寵漿錛夛紝閭d箞鍦ㄥ鐞?#8221;涓婁竴欏?#8221;鐨勬椂鍊橲QL璇彞鍙互鏄細

SELECT * FROM message WHERE id > 9527 ORDER BY id ASC LIMIT 20;

澶勭悊”涓嬩竴欏?#8221;鐨勬椂鍊橲QL璇彞鍙互鏄細

SELECT * FROM message WHERE id < 9500 ORDER BY id DESC LIMIT 20;

涓嶇緲誨灝戦〉錛屾瘡嬈℃煡璇㈠彧鎵弿20琛屻?/p>

緙虹偣鏄彧鑳芥彁渚?#8221;涓婁竴欏?#8221;銆?#8221;涓嬩竴欏?#8221;鐨勯摼鎺ュ艦寮忥紝浣嗘槸鏈変簺浜洪潪甯稿枩嬈?#8221;<涓婁竴欏?1 2 3 4 5 6 7 8 9 涓嬩竴欏?gt;”榪欐牱鐨勯摼鎺ユ柟寮忥紝鎬庝箞鍔炲憿錛?/p>

濡傛灉LIMIT m,n涓嶅彲閬垮厤鐨勮瘽錛岃浼樺寲鏁堢巼錛屽彧鏈夊敖鍙兘鐨勮m灝忎竴涓嬶紝鎴戜滑鎵╁睍鍓嶉潰鐨?#8221;clue”鍋氭硶錛岃繕鏄疭ELECT * FROM message ORDER BY id DESC錛屾寜id闄嶅簭鍒嗛〉錛屾瘡欏?0鏉★紝褰撳墠鏄10欏碉紝褰撳墠欏墊潯鐩甶d鏈澶х殑鏄?527錛屾渶灝忕殑鏄?500錛屾瘮濡傝璺沖埌絎?欏碉紝鎴戠湅鐨凷QL璇彞鍙互榪欐牱鍐欙細

SELECT * FROM message WHERE id > 9527 ORDER BY id ASC LIMIT 20,20;

璺寵漿鍒扮13欏碉細

SELECT * FROM message WHERE id < 9500 ORDER BY id DESC LIMIT 40,20;

鍘熺悊榪樻槸涓鏍鳳紝璁板綍浣忓綋鍓嶉〉id鐨勬渶澶у煎拰鏈灝忓鹼紝璁$畻璺寵漿欏甸潰鍜屽綋鍓嶉〉鐩稿鍋忕Щ錛岀敱浜庨〉闈㈢浉榪戯紝榪欎釜鍋忕Щ閲忎笉浼氬緢澶э紝榪欐牱鐨勮瘽m鍊肩浉瀵硅緝灝忥紝澶уぇ鍑忓皯鎵弿鐨勮鏁般傚叾瀹炰紶緇熺殑limit m,n錛岀浉瀵圭殑鍋忕Щ涓鐩存槸絎竴欏碉紝榪欐牱鐨勮瘽瓚婄炕鍒板悗闈紝鏁堢巼瓚婂樊錛岃屼笂闈㈢粰鍑虹殑鏂規硶灝辨病鏈夎繖鏍風殑闂銆?/p>

 



]]>
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