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MySQL鏁版嵁搴撳熀紜錛氭暟鎹被鍨嬪強鍒楃被鍨?/title><link>http://m.shnenglu.com/PeakGao/archive/2007/04/24/22759.html</link><dc:creator>PeakGao</dc:creator><author>PeakGao</author><pubDate>Tue, 24 Apr 2007 13:03:00 GMT</pubDate><guid>http://m.shnenglu.com/PeakGao/archive/2007/04/24/22759.html</guid><wfw:comment>http://m.shnenglu.com/PeakGao/comments/22759.html</wfw:comment><comments>http://m.shnenglu.com/PeakGao/archive/2007/04/24/22759.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://m.shnenglu.com/PeakGao/comments/commentRss/22759.html</wfw:commentRss><trackback:ping>http://m.shnenglu.com/PeakGao/services/trackbacks/22759.html</trackback:ping><description><![CDATA[<p style="TEXT-INDENT: 2em"><strong>銆?鏈嶅姟鍣ㄥ闄€?/strong>鎴戜滑瑕佹妸鐜板疄涓栫晫涓殑鍚勭淇℃伅杞崲鎴愯綆楁満鑳界悊瑙g殑涓滆タ錛岃繖浜涜漿鎹㈠悗鐨勪俊鎭氨褰㈡垚浜嗘暟鎹備緥濡傦紝鏌愪漢鐨勫嚭鐢熸棩鏈熸槸“1987騫?鏈?3鏃?#8221;錛屼粬鐨勮韓楂樻槸170鍘樼背錛岀瓑絳夈傛暟鎹笉浠呭寘鎷暟瀛椼佸瓧姣嶃佹枃瀛楀拰鍏朵粬鐗規(guī)畩瀛楃緇勬垚鐨勬枃鏈艦寮忕殑鏁版嵁錛岃屼笖榪樺寘鎷浘褰€佸浘鍍忋佸姩鐢匯佸獎鍍忋佸0闊崇瓑澶氬獟浣撴暟鎹備絾浣跨敤鏈澶氥佹渶鍩烘湰鐨勪粛鐒舵槸鏂囨湰鏁版嵁銆?br><br><strong>    1. MySQL鐨勬暟鎹被鍨?nbsp;<br></strong><br>    鍦∕ySQL涓湁濡備笅鍑犵鏁版嵁綾誨瀷錛?nbsp;<br><br>    錛?錛夋暟鍊煎瀷 <br><br>    鏁板兼槸璇稿32 鎴?53.4 榪欐牱鐨勫箋侻ySQL 鏀寔縐戝琛ㄧず娉曪紝縐戝琛ㄧず娉曠敱鏁存暟鎴栨誕鐐規(guī)暟鍚庤窡“e”鎴?#8220;E”銆佷竴涓鍙鳳紙“+”鎴?#8220;-”錛夊拰涓涓暣鏁版寚鏁版潵琛ㄧず銆?.24E+12 鍜?3.47e-1 閮芥槸鍚堟硶鐨勭瀛﹁〃紺烘硶琛ㄧず鐨勬暟銆傝?.24E12 涓嶆槸鍚堟硶鐨勶紝鍥犱負(fù)鎸囨暟鍓嶇殑絎﹀彿鏈粰鍑恒?nbsp;<br><br>    嫻偣鏁扮敱鏁存暟閮ㄥ垎銆佷竴涓皬鏁扮偣鍜屽皬鏁伴儴鍒嗙粍鎴愩傛暣鏁伴儴鍒嗗拰灝忔暟閮ㄥ垎鍙互鍒嗗埆涓虹┖錛屼絾涓嶈兘鍚屾椂涓虹┖銆?nbsp;<br><br>    鏁板煎墠鍙斁涓涓礋鍙?#8220;-”浠ヨ〃紺鴻礋鍊箋?nbsp;<br><br>    錛?錛夊瓧絎︼紙涓詫級鍨?nbsp;<br><br>    瀛楃鍨嬶紙涔熷彨瀛楃涓插瀷錛岀畝縐頒覆錛夋槸璇稿“Hello, world!”鎴?#8220;涓涓澶村紩璧風(fēng)殑琛妗?#8221;榪欐牱鐨勫鹼紝鎴栬呮槸鐢?shù)璇濆忥L(fēng)爜87398413榪欐牱鐨勫箋傛棦鍙敤鍗曞紩鍙蜂篃鍙敤鍙屽紩鍙峰皢涓插兼嫭璧鋒潵銆?br> <br>    鍒濆鑰呭線寰鍒嗕笉娓呮暟鍊?7398143鍜屽瓧絎︿覆87398143鐨勫尯鍒傞兘鏄暟瀛楀晩錛屾庝箞涓涓鐢ㄦ暟鍊煎瀷錛屼竴涓鐢ㄥ瓧絎﹀瀷鍛紵鍏抽敭灝卞湪浜庯細(xì)鏁板煎瀷鐨?7398143鏄鍙備笌璁$畻鐨勶紝姣斿瀹冩槸閲戣瀺涓殑涓涓揣嬈炬婚錛涜屽瓧絎﹀瀷鐨?7398143鏄笉鍙備笌璁$畻鐨勶紝鍙槸琛ㄧず鐢?shù)璇濆忥L(fēng)爜錛岃繖鏍風(fēng)殑榪樻湁琛楅亾鍙風(fēng)爜銆侀棬鐗屽彿鐮佺瓑絳夛紝瀹冧滑閮戒笉鍙備笌璁$畻銆?nbsp;<br><br>    錛?錛夋棩鏈熷拰鏃墮棿鍨?nbsp;<br><br>    鏃ユ湡鍜屾椂闂存槸涓浜涜濡?#8220;2006-07-12”鎴?#8220;12:30:43”榪欐牱鐨勫箋侻ySQL榪樻敮鎸佹棩鏈?鏃墮棿鐨勭粍鍚堬紝濡?#8220;2006-07-12 12:30:43”銆?nbsp;<br><br>    錛?錛塏ULL鍊?nbsp;<br><br>    NULL琛ㄧず鏈煡鍊箋傛瘮濡傚~鍐欒〃鏍間腑閫氳鍦板潃涓嶆竻妤氱暀絀轟笉濉啓錛岃繖灝辨槸NULL鍊箋?nbsp;<br><br>    鎴戜滑鐢–reate Table璇彞鍒涘緩涓涓〃錛堝弬鐪嬪墠闈㈢殑绔犺妭錛夛紝榪欎釜琛ㄤ腑鍖呭惈鍒楃殑瀹氫箟銆備緥濡傛垜浠湪鍓嶉潰鍒涘緩浜嗕竴涓猨oke琛紝榪欎釜琛ㄤ腑鏈塩ontent鍜寃riter涓や釜鍒楋細(xì)<br> <p>   <center><ccid_nobr> <pre><ccid_code>CREATE TABLE 錛? content varchar(20) NOT NULL, writer varchar(10) NULL 錛?/ccid_code></pre> </ccid_nobr></center>  <p> </p> <p>   瀹氫箟涓涓垪鐨勮娉曞涓嬶細(xì)<br></p> <p> <center><ccid_nobr> <pre><ccid_code>col_name col_typy [col_attributes] <br>[general_attributes]</ccid_code></pre> </ccid_nobr></center>  <p> </p> <p>   鍏朵腑鍒楀悕鐢眂ol_name 緇欏嚭銆傚垪鍚嶅彲鏈澶氬寘鍚?4涓瓧絎︼紝瀛楃鍖呮嫭瀛楁瘝銆佹暟瀛椼佷笅鍒掔嚎鍙婄編鍏冪鍙楓傚垪鍚嶅彲浠ュ悕瀛椾腑鍚堟硶鐨勪換浣曠鍙鳳紙鍖呮嫭鏁板瓧錛夊紑澶淬備絾鍒楀悕涓嶈兘瀹屽叏鐢辨暟瀛楃粍鎴愶紝鍥犱負(fù)閭f牱鍙兘浣垮叾涓庢暟鎹垎涓嶅紑銆侻ySQL淇濈暀璇稿SELECT銆丏ELETE鍜孋REATE榪欐牱鐨勮瘝錛岃繖浜涜瘝涓嶈兘鐢ㄥ仛鍒楀悕錛屼絾鏄嚱鏁板悕錛堝POS 鍜孧IN錛夋槸鍙互浣跨敤鐨勩?nbsp;<br><br>    鍒楃被鍨媍ol_type琛ㄧず鍒楀彲瀛樺偍鐨勭壒瀹氬箋傚垪綾誨瀷璇存槑絎﹁繕鑳借〃紺哄瓨鏀懼湪鍒椾腑鐨勫肩殑鏈澶ч暱搴︺傚浜庢煇浜涚被鍨嬶紝鍙敤涓涓暟鍊兼槑紜湴璇存槑鍏墮暱搴︺傝屽彟澶栦竴浜涘鹼紝鍏墮暱搴︾敱綾誨瀷鍚嶈暣鍚備緥濡傦紝CHAR(10) 鏄庣‘鎸囧畾浜?0涓瓧絎︾殑闀垮害錛岃孴INYBLOB鍊奸殣鍚渶澶ч暱搴︿負(fù)255涓瓧絎︺傛湁鐨勭被鍨嬭鏄庣鍏佽鎸囧畾鏈澶х殑鏄劇ず瀹藉害錛堝嵆鏄劇ず鍊兼椂浣跨敤澶氬皯涓瓧絎︼級銆傛誕鐐圭被鍨嬪厑璁告寚瀹氬皬鏁頒綅鏁幫紝鎵浠ヨ兘鎺у埗嫻偣鏁扮殑綺懼害鍊間負(fù)澶氬皯銆?nbsp;<br><br>    鍙互鍦ㄥ垪綾誨瀷涔嬪悗鎸囧畾鍙夌殑綾誨瀷璇存槑灞炴э紝浠ュ強鎸囧畾鏇村鐨勫父瑙佸睘鎬с傚睘鎬ц搗淇グ綾誨瀷鐨勪綔鐢紝騫舵洿鏀瑰叾澶勭悊鍒楀肩殑鏂瑰紡錛屽睘鎬ф湁浠ヤ笅綾誨瀷錛?nbsp;<br><br>    錛?錛変笓鐢ㄥ睘鎬х敤浜庢寚瀹氬垪銆備緥濡傦紝UNSIGNED 灞炴у彧閽堝鏁村瀷錛岃孊INARY灞炴у彧鐢ㄤ簬CHAR 鍜孷ARCHAR銆?nbsp;<br><br>    錛?錛夐氱敤灞炴ч櫎灝戞暟鍒椾箣澶栧彲鐢ㄤ簬浠繪剰鍒椼傚彲浠ユ寚瀹歂ULL 鎴朜OT NULL 浠ヨ〃紺烘煇涓垪鏄惁鑳藉瀛樻斁NULL銆傝繕鍙互鐢―EFAULT錛宒ef_value 鏉ヨ〃紺哄湪鍒涘緩涓涓柊琛屼絾鏈槑紜粰鍑鴻鍒楃殑鍊兼椂錛岃鍒楀彲璧嬩簣鍊糳ef_value銆俤ef_value 蹇呴』涓轟竴涓父閲忥紱瀹冧笉鑳芥槸琛ㄨ揪寮忥紝涔熶笉鑳藉紩鐢ㄥ叾浠栧垪銆備笉鑳藉BLOB 鎴朤EXT 鍒楁寚瀹氱己鐪佸箋?nbsp;<br><br>    濡傛灉鎯崇粰鍑哄涓垪鐨勪笓鐢ㄥ睘鎬э紝鍙寜浠繪剰欏哄簭鎸囧畾瀹冧滑錛屽彧瑕佸畠浠窡鍦ㄥ垪綾誨瀷涔嬪悗銆侀氱敤灞炴т箣鍓嶅嵆鍙傜被浼煎湴錛屽鏋滈渶瑕佺粰鍑哄涓氱敤灞炴э紝涔熷彲鎸変換鎰忛『搴忕粰鍑哄畠浠紝鍙灝嗗畠浠斁鍦ㄥ垪綾誨瀷鍜屽彲鑳界粰鍑虹殑鍒椾笓鐢ㄥ睘鎬т箣鍚庡嵆鍙?nbsp;</p> [NextPage]   <strong> </strong>    <strong>2. MySQL鐨勫垪錛堝瓧孌碉級綾誨瀷 <br><br></strong>    鏁版嵁搴撲腑鐨勬瘡涓〃閮芥槸鐢變竴涓垨澶氫釜鍒楋紙瀛楁錛夋瀯鎴愮殑銆傚湪鐢–REATE TABLE璇彞鍒涘緩涓涓〃鏃訛紝瑕佷負(fù)姣忓垪錛堝瓧孌碉級鎸囧畾涓涓被鍨嬨傚垪錛堝瓧孌碉級鐨勭被鍨嬫瘮鏁版嵁綾誨瀷鏇翠負(fù)緇嗗寲錛屽畠綺劇‘鍦版弿榪頒簡緇欏畾琛ㄥ垪錛堝瓧孌碉級鍙兘鍖呭惈鐨勫肩殑縐嶇被錛屽鏄惁甯﹀皬鏁般佹槸鍚︽枃瀛楀緢澶氥?<br><br><strong>    2.1鏁板煎垪綾誨瀷 <br></strong><br>    MySQL鏈夋暣鏁板拰嫻偣鏁板肩殑鍒楃被鍨嬶紝濡傝〃1鎵紺恒傛暣鏁板垪綾誨瀷鍙互鏈夌鍙蜂篃鍙棤絎﹀彿銆傛湁涓縐嶇壒孌婄殑灞炴у厑璁告暣鏁板垪鍊艱嚜鍔ㄧ敓鎴愶紝榪欏闇瑕佸敮涓搴忓垪鎴栨爣璇嗗彿鐨勫簲鐢ㄧ郴緇熸潵璇存槸闈炲父鏈夌敤鐨勩?br> <p> <p align=center><strong>綾誨瀷</strong></p> <p align=center><strong>璇存槑</strong></p> TINYINT 闈炲父灝忕殑鏁存暟 SMALLINT 杈冨皬鏁存暟 MEDIUMINT 涓瓑澶у皬鏁存暟 INT 鏍囧噯鏁存暟 BIGINT 杈冨ぇ鏁存暟 FLOAT 鍗曠簿搴︽誕鐐規(guī)暟 DOUBLE 鍙岀簿搴︽誕鐐規(guī)暟 DECIMAL 涓涓覆鐨勬誕鐐規(guī)暟 <p> </p> <p align=center>琛?錛氭暟鍊煎垪綾誨瀷</p> <p align=left>    姣忕鏁板肩被鍨嬬殑鍚嶇О鍜屽彇鍊艱寖鍥村琛?鎵紺恒?br></p> <p align=left> <p align=center><strong>綾誨瀷璇存槑</strong></p> <p align=center><strong>鍙栧艱寖鍥?/strong></p> TINYINT[(M)] 鏈夌鍙峰鹼細(xì)-128 鍒?27錛? 27 鍒?7 - 1錛?<br>鏃犵鍙峰鹼細(xì)0鍒?55錛? 鍒?8 - 1錛?<br>SMALLINT[(M)] 鏈夌鍙峰鹼細(xì)-32768 鍒?2767錛? 215 鍒?15 - 1錛?<br>鏃犵鍙峰鹼細(xì)0鍒?5535錛? 鍒?1 6 - 1錛?<br>MEDIUMINT[(M)] 鏈夌鍙峰鹼細(xì)-8388608 鍒?388607錛? 22 3 鍒?2 3 - 1 錛?<br>鏃犵鍙峰鹼細(xì)0鍒?6777215錛? 鍒?2 4 - 1錛?<br>INT[(M)] 鏈夌鍙峰鹼細(xì)-2147683648 鍒?147683647錛? 231 鍒?31- 1錛?<br>鏃犵鍙峰鹼細(xì)0鍒?294967295錛? 鍒?32 - 1錛?<br>BIGINT[(M)] 鏈夌鍙峰鹼細(xì)-9223372036854775808 鍒?223373036854775807錛? 263鍒?63-1錛?<br><br>鏃犵鍙峰鹼細(xì)0鍒?8446744073709551615錛?鍒?64 – 1錛?<br>FLOAT[(M, D)] 鏈灝忛潪闆跺鹼細(xì)±1.175494351E - 38 DOUBLE[(M,D)] 鏈灝忛潪闆跺鹼細(xì)±2.2250738585072014E - 308 DECIMAL (M, D) 鍙彉錛涘叾鍊肩殑鑼冨洿渚濊禆浜嶮 鍜孌 <p> </p> <p align=center><br>琛?錛氭暟鍊煎垪綾誨瀷鐨勫彇鍊艱寖鍥?/p> <p align=left>    鍚勭綾誨瀷鍊兼墍闇鐨勫瓨鍌ㄩ噺濡傝〃3鎵紺恒?br></p> <p align=left> <p align=center><strong>綾誨瀷璇存槑</strong></p> <p align=center><strong>瀛樺偍闇姹?/strong></p> TINYINT[(M)] 1瀛楄妭 SMALLINT[(M)] 2瀛楄妭 MEDIUMINT[(M)] 3瀛楄妭 INT[(M)] 4瀛楄妭 BIGINT[(M)] 8瀛楄妭 FLOAT[(M, D)] 4瀛楄妭 DOUBLE[(M, D)] 8瀛楄妭 DECIMAL (M, D) M瀛楄妭錛圡ySQL < 3.23錛夛紝M+2瀛楄妭錛圡ySQL > 3.23 錛? <p> </p> <p align=center>琛?錛氭暟鍊煎垪綾誨瀷鐨勫瓨鍌ㄩ渶姹?/p> [NextPage]   <p style="TEXT-INDENT: 2em">MySQL鎻愪緵浜嗕簲縐嶆暣鍨嬶細(xì) TINYINT銆丼MALLINT銆丮EDIUMINT銆両NT鍜孊IGINT銆侷NT涓篒NTEGER鐨勭緝鍐欍傝繖浜涚被鍨嬪湪鍙〃紺虹殑鍙栧艱寖鍥翠笂鏄笉鍚岀殑銆傛暣鏁板垪鍙畾涔変負(fù)UNSIGNED浠庤岀鐢ㄨ礋鍊鹼紱榪欎嬌鍒楃殑鍙栧艱寖鍥翠負(fù)0浠ヤ笂銆傚悇縐嶇被鍨嬬殑瀛樺偍閲忛渶姹備篃鏄笉鍚岀殑銆傚彇鍊艱寖鍥磋緝澶х殑綾誨瀷鎵闇鐨勫瓨鍌ㄩ噺杈冨ぇ銆?<br><br>    MySQL 鎻愪緵涓夌嫻偣綾誨瀷錛?FLOAT銆丏OUBLE鍜孌ECIMAL銆備笌鏁村瀷涓嶅悓錛屾誕鐐圭被鍨嬩笉鑳芥槸UNSIGNED鐨勶紝鍏跺彇鍊艱寖鍥翠篃涓庢暣鍨嬩笉鍚岋紝榪欑涓嶅悓涓嶄粎鍦ㄤ簬榪欎簺綾誨瀷鏈夋渶澶у鹼紝鑰屼笖榪樻湁鏈灝忛潪闆跺箋傛渶灝忓兼彁渚涗簡鐩稿簲綾誨瀷綺懼害鐨勪竴縐嶅害閲忥紝榪欏浜庤褰曠瀛︽暟鎹潵璇存槸闈炲父閲嶈鐨勶紙褰撶劧錛屼篃鏈夎礋鐨勬渶澶у拰鏈灝忓鹼級銆?nbsp;<br><br>    鍦ㄩ夋嫨浜嗘煇縐嶆暟鍊肩被鍨嬫椂錛屽簲璇ヨ冭檻鎵瑕佽〃紺虹殑鍊肩殑鑼冨洿錛屽彧闇閫夋嫨鑳借鐩栬鍙栧肩殑鑼冨洿鐨勬渶灝忕被鍨嬪嵆鍙傞夋嫨杈冨ぇ綾誨瀷浼?xì)瀵菇I洪棿閫犳垚嫻垂錛屼嬌琛ㄤ笉蹇呰鍦板澶э紝澶勭悊璧鋒潵娌℃湁閫夋嫨杈冨皬綾誨瀷閭f牱鏈夋晥銆傚浜庢暣鍨嬪鹼紝濡傛灉鏁版嵁鍙栧艱寖鍥磋緝?yōu)畯锛屽錆h鍛樺勾榫勬垨鍏勫紵濮愬鏁幫紝鍒橳INYINT鏈鍚堥傘侻EDIUMINT鑳藉琛ㄧず鏁扮櫨涓囩殑鍊煎茍涓斿彲鐢ㄤ簬鏇村綾誨瀷鐨勫鹼紝浣嗗瓨鍌ㄤ唬浠瘋緝澶с侭IGINT鍦ㄥ叏閮ㄦ暣鍨嬩腑鍙栧艱寖鍥存渶澶э紝鑰屼笖闇瑕佺殑瀛樺偍絀洪棿鏄〃紺鴻寖鍥存澶х殑鏁村瀷INT綾誨瀷鐨勪袱鍊嶏紝鍥犳鍙湪紜疄闇瑕佹椂鎵嶇敤銆傚浜庢誕鐐瑰鹼紝DOUBLE鍗犵敤FLOAT鐨勪袱鍊嶇┖闂淬傞櫎闈炵壒鍒渶瑕侀珮綺懼害鎴栬寖鍥存瀬澶х殑鍊鹼紝涓鑸簲浣跨敤鍙敤涓鍗婂瓨鍌ㄤ唬浠風(fēng)殑FLOAT鍨嬫潵琛ㄧず鏁版嵁銆?nbsp;<br><br>    鍦ㄥ畾涔夋暣鍨嬪垪鏃訛紝鍙互鎸囧畾鍙夌殑鏄劇ず灝哄M銆傚鏋滆繖鏍鳳紝M搴旇鏄竴涓? 鍒?55鐨勬暣鏁般傚畠琛ㄧず鐢ㄦ潵鏄劇ず鍒椾腑鍊肩殑瀛楃鏁般備緥濡傦紝MEDIUMINT(4)鎸囧畾浜嗕竴涓叿鏈?涓瓧絎︽樉紺哄搴︾殑MEDIUMINT鍒椼傚鏋滃畾涔変簡涓涓病鏈夋槑紜搴︾殑鏁存暟鍒楋紝灝嗕細(xì)鑷姩鍒嗛厤緇欏畠涓涓己鐪佺殑瀹藉害銆傜己鐪佸間負(fù)姣忕綾誨瀷鐨?#8220;鏈闀?#8221;鍊肩殑闀垮害銆傚鏋滄煇涓壒瀹氬肩殑鍙墦鍗拌〃紺洪渶瑕佷笉姝涓瓧絎︼紝鍒欐樉紺哄畬鍏ㄧ殑鍊鹼紱涓嶄細(xì)灝嗗兼埅鏂互閫傚悎M涓瓧絎︺?nbsp;<br><br>    瀵規(guī)瘡縐嶆誕鐐圭被鍨嬶紝鍙寚瀹氫竴涓渶澶х殑鏄劇ず灝哄M 鍜屽皬鏁頒綅鏁癉銆侻 鐨勫煎簲璇ュ彇1 鍒?55銆侱鐨勫煎彲涓? 鍒? 0錛屼絾鏄笉搴斿ぇ浜嶮 - 2錛堝鏋滅啛鎮(zhèn)塐DBC 鏈錛屽氨浼?xì)鐭ラ亾M 鍜孌 瀵瑰簲浜嶰DBC 姒傚康鐨?#8220;綺懼害”鍜?#8220;灝忔暟鐐逛綅鏁?#8221;錛夈侻鍜孌瀵笷LOAT鍜孌OUBLE 閮芥槸鍙夌殑錛屼絾瀵逛簬DECIMAL鏄繀欏葷殑銆傚湪閫夐」M 鍜孌鏃訛紝濡傛灉鐪佺暐浜嗗畠浠紝鍒欎嬌鐢ㄧ己鐪佸箋?</p> <p><br><strong>    2.2瀛楃涓插垪綾誨瀷</strong> <br><br>    MySQL鎻愪緵浜嗗嚑縐嶅瓨鏀懼瓧絎︽暟鎹殑涓茬被鍨嬶紝鍏剁被鍨嬪涓嬶細(xì)<br></p> <p> <p align=center><strong>綾誨瀷鍚?/strong></p> <p align=center><strong>璇存槑</strong></p> CHAR 瀹氶暱瀛楃涓?VARCHAR 鍙彉闀垮瓧絎︿覆 TINYBLOB 闈炲父灝忕殑BLOB錛堜簩榪涘埗澶у璞★級 BLOB 灝廈LOB MEDIUMBLOB 涓瓑鐨凚LOB LONGBLOB 澶LOB TINYTEXT 闈炲父灝忕殑鏂囨湰涓?TEXT 灝忔枃鏈覆 MEDIUMTEXT 涓瓑鏂囨湰涓?LONGTEXT 澶ф枃鏈覆 ENUM 鏋氫婦錛涘垪鍙祴浜堟煇涓灇涓炬垚鍛?SET 闆嗗悎錛涘垪鍙祴浜堝涓泦鍚堟垚鍛? <p> </p> <p align=center>琛?錛氬瓧絎︿覆鍒楃被鍨?/p> <p align=left>    涓嬭〃緇欏嚭浜哅ySQL 瀹氫箟涓插煎垪鐨勭被鍨嬶紝浠ュ強姣忕綾誨瀷鐨勬渶澶у昂瀵稿拰瀛樺偍闇姹傘傚浜庡彲鍙橀暱鐨勫垪綾誨瀷錛屽悇琛岀殑鍊兼墍鍗犵殑瀛樺偍閲忔槸涓嶅悓鐨勶紝榪欏彇鍐充簬瀹為檯瀛樻斁鍦ㄥ垪涓殑鍊肩殑闀垮害銆傝繖涓暱搴﹀湪琛ㄤ腑鐢↙ 琛ㄧず銆?br></p> <p align=left> <p align=center><strong>綾誨瀷璇存槑</strong></p> <p align=center><strong>鏈澶у昂瀵?/strong></p> <p align=center><strong>瀛樺偍闇姹?/strong></p> CHAR( M) M 瀛楄妭 M 瀛楄妭 VARCHAR(M) M 瀛楄妭 L + 1瀛楄妭 TINYBLOB, TINYTEXT 2<sup>8</sup>- 1瀛楄妭 L + 1瀛楄妭 BLOB, TEXT 2<sup>16</sup> - 1 瀛楄妭 L + 2瀛楄妭 MEDIUMBLOB, MEDIUMTEXT 2<sup>24</sup>- 1瀛楄妭 L + 3瀛楄妭 LONGBLOB, LONGTEXT 2<sup>32</sup>- 1瀛楄妭 L + 4瀛楄妭 ENUM(“value1”, “value2”, ...) 65535 涓垚鍛?1 鎴?瀛楄妭 SET (“value1”, “value2”, ...) 64涓垚鍛?1銆?銆?銆? 鎴?瀛楄妭 <p> </p> <p align=center>琛?錛氫覆鍒楃被鍨嬫渶澶у昂瀵稿強瀛樺偍闇姹?/p> <p align=left>    L 浠ュ鎵闇鐨勯澶栧瓧鑺備負(fù)瀛樻斁璇ュ肩殑闀垮害鎵闇鐨勫瓧鑺傛暟銆侻ySQL 閫氳繃瀛樺偍鍊肩殑鍐呭鍙婂叾闀垮害鏉ュ鐞嗗彲鍙橀暱搴︾殑鍊箋傝繖浜涢澶栫殑瀛楄妭鏄棤絎﹀彿鏁存暟銆傝娉ㄦ剰錛屽彲鍙橀暱綾誨瀷鐨勬渶澶ч暱搴︺佹綾誨瀷鎵闇鐨勯澶栧瓧鑺傛暟浠ュ強鍗犵敤鐩稿悓瀛楄妭鏁扮殑鏃犵鍙鋒暣鏁頒箣闂寸殑瀵瑰簲鍏崇郴銆備緥濡傦紝MEDIUMBLOB 鍊煎彲鑳芥渶澶?24 - 1瀛楄妭闀垮茍闇瑕? 涓瓧鑺傝褰曞叾緇撴灉銆? 涓瓧鑺傜殑鏁存暟綾誨瀷MEDIUMINT 鐨勬渶澶ф棤絎﹀彿鍊間負(fù)224 - 1銆傝繖騫墮潪鍋剁劧銆?/p> [NextPage]   <strong> </strong>    <strong>2.3鏃ユ湡鏃墮棿鍒楃被鍨?<br><br></strong>    MySQL 鎻愪緵浜嗗嚑縐嶆椂闂村肩殑鍒楃被鍨嬶紝瀹冧滑鍒嗗埆鏄細(xì) DATE銆丏ATETIME銆乀IME銆乀IMESTAMP鍜孻EAR銆備笅琛ㄧ粰鍑轟簡MySQL 涓哄畾涔夊瓨鍌ㄦ棩鏈熷拰鏃墮棿鍊兼墍鎻愪緵鐨勮繖浜涚被鍨嬶紝騫剁粰鍑轟簡姣忕綾誨瀷鐨勫悎娉曞彇鍊艱寖鍥淬?br><br> <p> <p align=center><strong>綾誨瀷鍚?/strong></p> <p align=center><strong>璇存槑</strong></p> DATE “YYYY-MM-DD”鏍煎紡琛ㄧず鐨勬棩鏈熷?TIME “hh:mm:ss”鏍煎紡琛ㄧず鐨勬椂闂村?DATETIME “YYYY-MM-DD hh:mm:ss”鏍煎紡 TIMESTAMP “YYYYMMDDhhmmss”鏍煎紡琛ㄧず鐨勬椂闂存埑鍊?YEAR “YYYY”鏍煎紡鐨勫勾浠藉? <p> </p> <p align=center>琛?錛氭棩鏈熸椂闂村垪綾誨瀷</p> <p align=left> <p align=center><strong>綾誨瀷鍚?/strong></p> <p align=center><strong>鍙栧艱寖鍥?/strong></p> <p align=center><strong>瀛樺偍闇姹?/strong></p> DATE “1000-01-01”鍒?#8220;9999-12-31” 3瀛楄妭 TIME “-838:59:59”鍒?#8220;838:59:59” 3瀛楄妭 DATETIME “1000-01-01 00:00:00” 鍒?#8220;9999-12-31 23:59:59” 8瀛楄妭 TIMESTAMP 19700101000000 鍒?037 騫寸殑鏌愪釜鏃跺埢 4瀛楄妭 YEAR 1901 鍒?155 1瀛楄妭 <p> </p> <p align=center>琛?錛?鏃ュ墠鏃墮棿鍒楃被鍨嬬殑鍙栧艱寖鍥村拰瀛樺偍闇姹?/p> <p align=left>    涓嬮潰涓句釜渚嬪瓙錛?br></p> <p align=left> <center><ccid_nobr> <pre><ccid_code>CREATE TABLE student ( Name varchar(20) NOT NULL錛? Chinese TINYINT(3)錛? Maths TINYINT(3)錛? English TINYINT(3)錛? Birthday DATE )</ccid_code></pre> </ccid_nobr></center> <p> </p> <p align=left>    榪欎釜渚嬪瓙鍒涘緩涓涓猻tudent琛紝榪欎釜琛ㄤ腑鏈塶ame瀛楁錛屽瓧絎︾被鍨嬪垪錛屼笉鍏佽NULL錛堢┖鍊鹼級銆傛湁Chinese銆丮aths鍜孍nglish涓変釜鏁存暟綾誨瀷鍒椼傝繕鏈変釜Birthday鏃ユ湡綾誨瀷鍒椼?br></p> <img src ="http://m.shnenglu.com/PeakGao/aggbug/22759.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://m.shnenglu.com/PeakGao/" target="_blank">PeakGao</a> 2007-04-24 21:03 <a href="http://m.shnenglu.com/PeakGao/archive/2007/04/24/22759.html#Feedback" target="_blank" style="text-decoration:none;">鍙戣〃璇勮</a></div>]]></description></item><item><title>鑰佸鐢╬hp鍐欑殑涓涓狹ySQL綾?/title><link>http://m.shnenglu.com/PeakGao/archive/2007/04/03/21187.html</link><dc:creator>PeakGao</dc:creator><author>PeakGao</author><pubDate>Tue, 03 Apr 2007 10:43:00 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