锘??xml version="1.0" encoding="utf-8" standalone="yes"?><rss version="2.0" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:trackback="http://madskills.com/public/xml/rss/module/trackback/" xmlns:wfw="http://wellformedweb.org/CommentAPI/" xmlns:slash="http://purl.org/rss/1.0/modules/slash/"><channel><title>&#20122;&#27954;&#20154;&#25104;&#24433;&#38498;&#55;&#55;&#55;&#55;&#55;&#44;&#22269;&#20135;&#31934;&#21697;&#20122;&#27954;&#32508;&#21512;&#20116;&#26376;&#22825;&#44;&#20122;&#27954;&#22269;&#20135;&#20081;&#30721;&#26368;&#26032;&#35270;&#39057;</title><link>http://www.tkk7.com/kangdy/archive/2011/11/30/365223.html</link><dc:creator>AK47</dc:creator><author>AK47</author><pubDate>Wed, 30 Nov 2011 09:24:00 GMT</pubDate><guid>http://www.tkk7.com/kangdy/archive/2011/11/30/365223.html</guid><wfw:comment>http://www.tkk7.com/kangdy/comments/365223.html</wfw:comment><comments>http://www.tkk7.com/kangdy/archive/2011/11/30/365223.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.tkk7.com/kangdy/comments/commentRss/365223.html</wfw:commentRss><trackback:ping>http://www.tkk7.com/kangdy/services/trackbacks/365223.html</trackback:ping><description><![CDATA[鏁版嵁搴撹繛鎺ュ垎涓猴細鍐呰繛鎺ワ紝澶栬繛鎺?宸︺�佸彸榪炴帴錛屽叏榪炴帴)錛屼氦鍙夎繛鎺?br />鏂囩珷鍦板潃 錛?nbsp;<a >http://www.zxbc.cn/html/20080527/51189.html</a><fieldset><legend>杞澆&nbsp;</legend><div><div>鍐呰繛鎺ワ細鎶婁袱涓〃涓暟鎹搴旂殑鏁版嵁鏌ュ嚭鏉?nbsp;</div><div>澶栬繛鎺ワ細浠ユ煇涓〃涓哄熀紜�鎶婂搴旀暟鎹煡鍑烘潵錛堝叏榪炴帴鏄互澶氫釜琛ㄤ負鍩虹錛?nbsp;</div><div></div><div>student琛?nbsp;</div><div>no name&nbsp;</div><div>1 &nbsp;&nbsp;&nbsp;&nbsp;a&nbsp;</div><div>2 &nbsp;&nbsp;&nbsp;&nbsp;b&nbsp;</div><div>3 &nbsp;&nbsp;&nbsp;&nbsp;c&nbsp;</div><div>4 &nbsp;&nbsp;&nbsp;&nbsp;d&nbsp;</div><div></div><div>grade琛?nbsp;</div><div>no grade&nbsp;</div><div>1 &nbsp;&nbsp;&nbsp;&nbsp;90&nbsp;</div><div>2&nbsp;&nbsp;&nbsp;&nbsp; 98&nbsp;</div><div>3 &nbsp;&nbsp;&nbsp;&nbsp;95&nbsp;</div><div></div><div>鍐呰繛鎺?inner join錛堟煡鎵炬潯浠朵腑瀵瑰簲鐨勬暟鎹紝no4娌℃湁鏁版嵁涓嶅垪鍑烘潵錛?nbsp;</div><div>璇硶錛歴elect * from student inner join grade on student.no = grade.no&nbsp;</div><div>緇撴灉&nbsp;</div><div>student.no name grade.no grade&nbsp;</div><div>1 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;a &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;90&nbsp;</div><div>2 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;b &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;98&nbsp;</div><div>3 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;c &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;95&nbsp;</div><div></div><div>宸﹁繛鎺ワ紙宸﹁〃涓墍鏈夋暟鎹紝鍙寵〃涓搴旀暟鎹級&nbsp;</div><div>璇硶錛歴elect * from student left join grade on student.no = grade.no&nbsp;</div><div>緇撴灉錛?nbsp;</div><div>student.no name grade.no grade&nbsp;</div><div>1 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;a &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;90&nbsp;</div><div>2 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;b &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;98&nbsp;</div><div>3 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;c &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3 &nbsp; &nbsp; &nbsp; &nbsp; 95&nbsp;</div><div>4 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;d&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</div><div></div><div>鍙寵繛鎺ワ紙鍙寵〃涓墍鏈夋暟鎹紝宸﹁〃涓搴旀暟鎹級&nbsp;</div><div>璇硶錛歴elect * from student right join grade on student.no = grade.no&nbsp;</div><div>緇撴灉錛?nbsp;</div><div>student.no name grade.no grade&nbsp;</div><div>1 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;a &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;90&nbsp;</div><div>2 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;b &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;98&nbsp;</div><div>3 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;c &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;95&nbsp;</div><div></div><div>鍏ㄨ繛鎺?nbsp;</div><div>璇硶錛歴elect * from student full join grade on student.no = grade.no&nbsp;</div><div>緇撴灉錛?nbsp;</div><div>no name grade&nbsp;</div><div>1 &nbsp;&nbsp;&nbsp;&nbsp;a &nbsp;&nbsp;&nbsp;&nbsp;90&nbsp;</div><div>2 &nbsp;&nbsp;&nbsp;&nbsp;b &nbsp;&nbsp;&nbsp;&nbsp;98&nbsp;</div><div>3 &nbsp;&nbsp;&nbsp;&nbsp;c &nbsp;&nbsp;&nbsp;&nbsp;95&nbsp;</div><div>4 &nbsp;&nbsp;&nbsp;&nbsp;d&nbsp;</div><div>1 &nbsp;&nbsp;&nbsp;&nbsp;a &nbsp;&nbsp;&nbsp;&nbsp;90&nbsp;</div><div>2 &nbsp;&nbsp;&nbsp;&nbsp;b &nbsp;&nbsp;&nbsp;&nbsp;98&nbsp;</div><div>3 &nbsp;&nbsp;&nbsp;&nbsp;c &nbsp;&nbsp;&nbsp;&nbsp;95&nbsp;</div><div></div><div>娉細access 涓笉鑳界洿鎺ヤ嬌鐢╢ull join 錛岄渶瑕佷嬌鐢╱nion all 灝嗗乏榪炴帴鍜屽彸榪炴帴鍚堝茍鍚庢墠鍙互</div></div></fieldset><br />浜ゅ弶榪炴帴<br />灝嗕袱涓〃鎵�鏈夎緇勫悎錛岃繛鎺ュ悗鐨勮鏁頒負涓や釜琛ㄨ鏁扮殑涔樼Н錛堢瑳鍗″皵縐級<br />璇硶錛屽�熺敤涓婇潰鐨勪緥瀛愬簲璇ユ槸<br /><div>select * from student cross join grade<br /><br />琛屾暟搴旇涓?2琛?錛?br /><div><div>no name grade&nbsp;</div><div>1 &nbsp; &nbsp; a &nbsp; &nbsp; 90&nbsp;</div><div>2 &nbsp; &nbsp; b &nbsp; &nbsp; 98&nbsp;</div><div>3 &nbsp;&nbsp;&nbsp;&nbsp;c &nbsp;&nbsp;&nbsp;&nbsp;95&nbsp;</div><div>4 &nbsp;&nbsp;&nbsp;&nbsp;d&nbsp;&nbsp;</div></div><div><div>1 &nbsp;&nbsp;&nbsp;&nbsp;a &nbsp;&nbsp;&nbsp;&nbsp;90&nbsp;</div><div>2 &nbsp;&nbsp;&nbsp;&nbsp;b &nbsp;&nbsp;&nbsp;&nbsp;98&nbsp;</div><div>3 &nbsp;&nbsp;&nbsp;&nbsp;c &nbsp;&nbsp;&nbsp;&nbsp;95&nbsp;</div><div>4 &nbsp;&nbsp;&nbsp;&nbsp;d&nbsp;</div></div><div><div>1 &nbsp;&nbsp;&nbsp;&nbsp;a &nbsp;&nbsp;&nbsp;&nbsp;90&nbsp;</div><div>2 &nbsp;&nbsp;&nbsp;&nbsp;b &nbsp;&nbsp;&nbsp;&nbsp;98&nbsp;</div><div>3 &nbsp;&nbsp;&nbsp;&nbsp;c &nbsp;&nbsp;&nbsp;&nbsp;95&nbsp;</div><div>4 &nbsp;&nbsp;&nbsp;&nbsp;d&nbsp;</div></div></div><img src ="http://www.tkk7.com/kangdy/aggbug/365223.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.tkk7.com/kangdy/" target="_blank">AK47</a> 2011-11-30 17:24 <a href="http://www.tkk7.com/kangdy/archive/2011/11/30/365223.html#Feedback" target="_blank" style="text-decoration:none;">鍙戣〃璇勮</a></div>]]></description></item><item><title>(杞創)鏁版嵁搴撲笁鑼冨紡緇忓吀瀹炰緥瑙ｆ瀽</title><link>http://www.tkk7.com/kangdy/archive/2011/02/21/344760.html</link><dc:creator>AK47</dc:creator><author>AK47</author><pubDate>Mon, 21 Feb 2011 06:45:00 GMT</pubDate><guid>http://www.tkk7.com/kangdy/archive/2011/02/21/344760.html</guid><wfw:comment>http://www.tkk7.com/kangdy/comments/344760.html</wfw:comment><comments>http://www.tkk7.com/kangdy/archive/2011/02/21/344760.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.tkk7.com/kangdy/comments/commentRss/344760.html</wfw:commentRss><trackback:ping>http://www.tkk7.com/kangdy/services/trackbacks/344760.html</trackback:ping><description><![CDATA[<p>鏁版嵁搴撶殑璁捐鑼冨紡鏄暟鎹簱璁捐鎵�闇�瑕佹弧瓚崇殑瑙勮寖錛屾弧瓚寵繖浜涜鑼冪殑鏁版嵁搴撴槸綆�媧佺殑銆佺粨鏋勬槑鏅扮殑錛屽悓鏃訛紝涓嶄細鍙戠敓鎻掑叆錛坕nsert錛夈�佸垹闄わ紙delete錛夊拰鏇存柊錛坲pdate錛夋搷浣滃紓甯搞�傚弽涔嬪垯鏄貢涓冨叓緋燂紝涓嶄粎緇欐暟鎹簱鐨勭紪紼嬩漢鍛樺埗閫犻夯鐑︼紝鑰屼笖闈㈢洰鍙啂錛屽彲鑳藉瓨鍌ㄤ簡澶ч噺涓嶉渶瑕佺殑鍐椾綑淇℃伅銆?br />
&nbsp;&nbsp;&nbsp;&nbsp; 璁捐鑼冨紡鏄笉鏄緢闅炬噦鍛紵闈炰篃錛屽ぇ瀛︽暀鏉愪笂緇欐垜浠竴鍫嗘暟瀛﹀叕寮忔垜浠綋鐒剁湅涓嶆噦錛屼篃璁頒笉浣忋�傛墍浠ユ垜浠緢澶氫漢灝辨牴鏈笉鎸夌収鑼冨紡鏉ヨ璁℃暟鎹簱銆?br />
&nbsp;&nbsp;&nbsp;&nbsp; 瀹炶川涓婏紝璁捐鑼冨紡鐢ㄥ緢褰㈣薄銆佸緢綆�媧佺殑璇濊灝辮兘璇存竻妤氾紝閬撴槑鐧姐�傛湰鏂囧皢瀵硅寖寮忚繘琛岄�氫織鍦拌鏄庯紝騫朵互絎旇�呮浘緇忚璁＄殑涓�涓畝鍗曡鍧涚殑鏁版嵁搴撲負渚嬫潵璁茶В鎬庢牱灝嗚繖浜涜寖寮忓簲鐢ㄤ簬瀹為檯宸ョ▼銆?br />
<strong></strong></p>
<p><strong>鑼冨紡璇存槑</strong><br />
&nbsp;&nbsp;&nbsp;&nbsp; 絎竴鑼冨紡錛?NF錛夛細鏁版嵁搴撹〃涓殑瀛楁閮芥槸鍗曚竴灞炴�х殑錛屼笉鍙啀鍒嗐�傝繖涓崟涓�灞炴�х敱鍩烘湰綾誨瀷鏋勬垚錛屽寘鎷暣鍨嬨�佸疄鏁般�佸瓧絎﹀瀷銆侀�昏緫鍨嬨�佹棩鏈熷瀷絳夈�?br />
&nbsp;&nbsp;&nbsp;&nbsp; 渚嬪錛屽涓嬬殑鏁版嵁搴撹〃鏄鍚堢涓�鑼冨紡錛?</p>
<p>
<table align="center" border="1" cellpadding="2" cellspacing="0" width="90%">
    <tbody>
        <tr>
            <td>瀛楁1 </td>
            <td>瀛楁2 </td>
            <td>瀛楁3 </td>
            <td>瀛楁4 </td>
        </tr>
        <tr>
            <td>? </td>
            <td>? </td>
            <td>? </td>
            <td>?</td>
        </tr>
    </tbody>
</table>
&nbsp;鑰岃繖鏍風殑鏁版嵁搴撹〃鏄笉絎﹀悎絎竴鑼冨紡鐨勶細
<table align="center" border="1" cellpadding="2" cellspacing="0" width="90%">
    <tbody>
        <tr>
            <td>瀛楁1 </td>
            <td>瀛楁2 </td>
            <td colspan="2">瀛楁3 </td>
            <td>瀛楁4 </td>
        </tr>
        <tr>
            <td>? </td>
            <td>? </td>
            <td>瀛楁3.1 </td>
            <td>瀛楁3.2 </td>
            <td>?</td>
        </tr>
    </tbody>
</table>
</p>
<p>&nbsp;</p>
<p>&nbsp;&nbsp;&nbsp; &nbsp;寰堟樉鐒訛紝鍦ㄥ綋鍓嶇殑浠諱綍鍏崇郴鏁版嵁搴撶鐞嗙郴緇燂紙DBMS錛変腑錛屽偦鐡滀篃涓嶅彲鑳藉仛鍑轟笉絎﹀悎絎竴鑼冨紡鐨勬暟鎹簱錛屽洜涓鴻繖浜汥BMS涓嶅厑璁鎬綘鎶婃暟鎹簱琛ㄧ殑涓�鍒楀啀鍒嗘垚浜屽垪鎴栧鍒椼�傚洜姝わ紝浣犳兂鍦ㄧ幇鏈夌殑DBMS涓璁″嚭涓嶇鍚堢涓�鑼冨紡鐨勬暟鎹簱閮芥槸涓嶅彲鑳界殑銆?br />
&nbsp;&nbsp;&nbsp;&nbsp; 絎簩鑼冨紡錛?NF錛夛細鏁版嵁搴撹〃涓笉瀛樺湪闈炲叧閿瓧孌靛浠諱竴鍊欓�夊叧閿瓧孌電殑閮ㄥ垎鍑芥暟渚濊禆錛堥儴鍒嗗嚱鏁頒緷璧栨寚鐨勬槸瀛樺湪緇勫悎鍏抽敭瀛椾腑鐨勬煇浜涘瓧孌靛喅瀹氶潪鍏抽敭瀛楁鐨勬儏鍐碉級錛屼篃鍗蟲墍鏈夐潪鍏抽敭瀛楁閮藉畬鍏ㄤ緷璧栦簬浠繪剰涓�緇勫�欓�夊叧閿瓧銆?br />
&nbsp;&nbsp;&nbsp;&nbsp; 鍋囧畾閫夎鍏崇郴琛ㄤ負SelectCourse(瀛﹀彿, 濮撳悕, 騫撮緞, 璇劇▼鍚嶇О, 鎴愮嘩, 瀛﹀垎)錛屽叧閿瓧涓虹粍鍚堝叧閿瓧(瀛﹀彿, 璇劇▼鍚嶇О)錛屽洜涓哄瓨鍦ㄥ涓嬪喅瀹氬叧緋伙細<br />
&nbsp;&nbsp;&nbsp;&nbsp; (瀛﹀彿, 璇劇▼鍚嶇О) &#8594; (濮撳悕, 騫撮緞, 鎴愮嘩, 瀛﹀垎)<br />
&nbsp;&nbsp;&nbsp;&nbsp; 榪欎釜鏁版嵁搴撹〃涓嶆弧瓚崇浜岃寖寮忥紝鍥犱負瀛樺湪濡備笅鍐沖畾鍏崇郴錛?br />
&nbsp;&nbsp;&nbsp;&nbsp; (璇劇▼鍚嶇О) &#8594; (瀛﹀垎)<br />
&nbsp;&nbsp;&nbsp;&nbsp; (瀛﹀彿) &#8594; (濮撳悕, 騫撮緞)<br />
鍗沖瓨鍦ㄧ粍鍚堝叧閿瓧涓殑瀛楁鍐沖畾闈炲叧閿瓧鐨勬儏鍐點�?br />
&nbsp;&nbsp;&nbsp;&nbsp; 鐢變簬涓嶇鍚?NF錛岃繖涓�夎鍏崇郴琛ㄤ細瀛樺湪濡備笅闂錛?br />
&nbsp;&nbsp;&nbsp;&nbsp; (1) 鏁版嵁鍐椾綑錛?br />
&nbsp;&nbsp;&nbsp;&nbsp; 鍚屼竴闂ㄨ紼嬬敱n涓鐢熼�変慨錛?瀛﹀垎"灝遍噸澶峮-1嬈★紱鍚屼竴涓鐢熼�変慨浜唌闂ㄨ紼嬶紝濮撳悕鍜屽勾榫勫氨閲嶅浜唌-1嬈°�?br />
&nbsp;&nbsp;&nbsp;&nbsp; (2) 鏇存柊寮傚父錛?br />
&nbsp;&nbsp;&nbsp;&nbsp; 鑻ヨ皟鏁翠簡鏌愰棬璇劇▼鐨勫鍒嗭紝鏁版嵁琛ㄤ腑鎵�鏈夎鐨?瀛﹀垎"鍊奸兘瑕佹洿鏂幫紝鍚﹀垯浼氬嚭鐜板悓涓�闂ㄨ紼嬪鍒嗕笉鍚岀殑鎯呭喌銆?br />
&nbsp;&nbsp;&nbsp;&nbsp; (3) 鎻掑叆寮傚父錛?br />
&nbsp;&nbsp;&nbsp;&nbsp; 鍋囪瑕佸紑璁句竴闂ㄦ柊鐨勮紼嬶紝鏆傛椂榪樻病鏈変漢閫変慨銆傝繖鏍鳳紝鐢變簬榪樻病鏈?瀛﹀彿"鍏抽敭瀛楋紝璇劇▼鍚嶇О鍜屽鍒嗕篃鏃犳硶璁板綍鍏ユ暟鎹簱銆?br />
&nbsp;&nbsp;&nbsp;&nbsp; (4) 鍒犻櫎寮傚父錛?br />
&nbsp;&nbsp;&nbsp;&nbsp; 鍋囪涓�鎵瑰鐢熷凡緇忓畬鎴愯紼嬬殑閫変慨錛岃繖浜涢�変慨璁板綍灝卞簲璇ヤ粠鏁版嵁搴撹〃涓垹闄ゃ�備絾鏄紝涓庢鍚屾椂錛岃紼嬪悕縐板拰瀛﹀垎淇℃伅涔熻鍒犻櫎浜嗐�傚緢鏄劇劧錛岃繖涔熶細瀵艱嚧鎻掑叆寮傚父銆?</p>
<p>&nbsp;&nbsp;&nbsp;&nbsp; 鎶婇�夎鍏崇郴琛⊿electCourse鏀逛負濡備笅涓変釜琛細<br />
&nbsp;&nbsp;&nbsp;&nbsp; 瀛︾敓錛歋tudent(瀛﹀彿, 濮撳悕, 騫撮緞)錛?br />
&nbsp;&nbsp;&nbsp;&nbsp; 璇劇▼錛欳ourse(璇劇▼鍚嶇О, 瀛﹀垎)錛?br />
&nbsp;&nbsp;&nbsp;&nbsp; 閫夎鍏崇郴錛歋electCourse(瀛﹀彿, 璇劇▼鍚嶇О, 鎴愮嘩)銆?br />
&nbsp;&nbsp;&nbsp;&nbsp; 榪欐牱鐨勬暟鎹簱琛ㄦ槸絎﹀悎絎簩鑼冨紡鐨勶紝娑堥櫎浜嗘暟鎹啑浣欍�佹洿鏂板紓甯搞�佹彃鍏ュ紓甯稿拰鍒犻櫎寮傚父銆?br />
&nbsp;&nbsp;&nbsp;&nbsp; 鍙﹀錛屾墍鏈夊崟鍏抽敭瀛楃殑鏁版嵁搴撹〃閮界鍚堢浜岃寖寮忥紝鍥犱負涓嶅彲鑳藉瓨鍦ㄧ粍鍚堝叧閿瓧銆?br />
&nbsp;&nbsp;&nbsp;&nbsp; 絎笁鑼冨紡錛?NF錛夛細鍦ㄧ浜岃寖寮忕殑鍩虹涓婏紝鏁版嵁琛ㄤ腑濡傛灉涓嶅瓨鍦ㄩ潪鍏抽敭瀛楁瀵逛換涓�鍊欓�夊叧閿瓧孌電殑浼犻�掑嚱鏁頒緷璧栧垯絎﹀悎絎笁鑼冨紡銆傛墍璋撲紶閫掑嚱鏁頒緷璧栵紝鎸囩殑鏄鏋滃瓨鍦?A &#8594; B &#8594; C"鐨勫喅瀹氬叧緋伙紝鍒機浼犻�掑嚱鏁頒緷璧栦簬A銆傚洜姝わ紝婊¤凍絎笁鑼冨紡鐨勬暟鎹簱琛ㄥ簲璇ヤ笉瀛樺湪濡備笅渚濊禆鍏崇郴錛?br />
&nbsp;&nbsp;&nbsp;&nbsp; 鍏抽敭瀛楁 &#8594; 闈炲叧閿瓧孌祒 &#8594; 闈炲叧閿瓧孌祔<br />
&nbsp;&nbsp;&nbsp;&nbsp; 鍋囧畾瀛︾敓鍏崇郴琛ㄤ負Student(瀛﹀彿, 濮撳悕, 騫撮緞, 鎵�鍦ㄥ闄? 瀛﹂櫌鍦扮偣, 瀛﹂櫌鐢佃瘽)錛屽叧閿瓧涓哄崟涓�鍏抽敭瀛?瀛﹀彿"錛屽洜涓哄瓨鍦ㄥ涓嬪喅瀹氬叧緋伙細<br />
&nbsp;&nbsp;&nbsp;&nbsp; (瀛﹀彿) &#8594; (濮撳悕, 騫撮緞, 鎵�鍦ㄥ闄? 瀛﹂櫌鍦扮偣, 瀛﹂櫌鐢佃瘽)<br />
榪欎釜鏁版嵁搴撴槸絎﹀悎2NF鐨勶紝浣嗘槸涓嶇鍚?NF錛屽洜涓哄瓨鍦ㄥ涓嬪喅瀹氬叧緋伙細<br />
&nbsp;&nbsp;&nbsp;&nbsp; (瀛﹀彿) &#8594; (鎵�鍦ㄥ闄? &#8594; (瀛﹂櫌鍦扮偣, 瀛﹂櫌鐢佃瘽)<br />
鍗沖瓨鍦ㄩ潪鍏抽敭瀛楁"瀛﹂櫌鍦扮偣"銆?瀛﹂櫌鐢佃瘽"瀵瑰叧閿瓧孌?瀛﹀彿"鐨勪紶閫掑嚱鏁頒緷璧栥�?br />
&nbsp;&nbsp;&nbsp;&nbsp; 瀹冧篃浼氬瓨鍦ㄦ暟鎹啑浣欍�佹洿鏂板紓甯搞�佹彃鍏ュ紓甯稿拰鍒犻櫎寮傚父鐨勬儏鍐碉紝璇昏�呭彲鑷鍒嗘瀽寰楃煡銆?br />
&nbsp;&nbsp;&nbsp;&nbsp; 鎶婂鐢熷叧緋昏〃鍒嗕負濡備笅涓や釜琛細<br />
&nbsp;&nbsp;&nbsp;&nbsp; 瀛︾敓錛?瀛﹀彿, 濮撳悕, 騫撮緞, 鎵�鍦ㄥ闄?錛?br />
&nbsp;&nbsp;&nbsp;&nbsp; 瀛﹂櫌錛?瀛﹂櫌, 鍦扮偣, 鐢佃瘽)銆?br />
榪欐牱鐨勬暟鎹簱琛ㄦ槸絎﹀悎絎笁鑼冨紡鐨勶紝娑堥櫎浜嗘暟鎹啑浣欍�佹洿鏂板紓甯搞�佹彃鍏ュ紓甯稿拰鍒犻櫎寮傚父銆?br />
&nbsp;&nbsp;&nbsp;&nbsp; 椴嶄緷鏂?縐戝緱鑼冨紡錛圔CNF錛夛細鍦ㄧ涓夎寖寮忕殑鍩虹涓婏紝鏁版嵁搴撹〃涓鏋滀笉瀛樺湪浠諱綍瀛楁瀵逛換涓�鍊欓�夊叧閿瓧孌電殑浼犻�掑嚱鏁頒緷璧栧垯絎﹀悎絎笁鑼冨紡銆?br />
&nbsp;&nbsp;&nbsp;&nbsp; 鍋囪浠撳簱綆＄悊鍏崇郴琛ㄤ負StorehouseManage(浠撳簱ID, 瀛樺偍鐗╁搧ID, 綆＄悊鍛業D, 鏁伴噺)錛屼笖鏈変竴涓鐞嗗憳鍙湪涓�涓粨搴撳伐浣滐紱涓�涓粨搴撳彲浠ュ瓨鍌ㄥ縐嶇墿鍝併�傝繖涓暟鎹簱琛ㄤ腑瀛樺湪濡備笅鍐沖畾鍏崇郴錛?br />
&nbsp;&nbsp;&nbsp; &nbsp;(浠撳簱ID, 瀛樺偍鐗╁搧ID) &#8594;(綆＄悊鍛業D, 鏁伴噺)<br />
&nbsp;&nbsp;&nbsp;&nbsp; (綆＄悊鍛業D, 瀛樺偍鐗╁搧ID) &#8594; (浠撳簱ID, 鏁伴噺)<br />
&nbsp;&nbsp;&nbsp;&nbsp; 鎵�浠ワ紝(浠撳簱ID, 瀛樺偍鐗╁搧ID)鍜?綆＄悊鍛業D, 瀛樺偍鐗╁搧ID)閮芥槸StorehouseManage鐨勫�欓�夊叧閿瓧錛岃〃涓殑鍞竴闈炲叧閿瓧孌典負鏁伴噺錛屽畠鏄鍚堢涓夎寖寮忕殑銆備絾鏄紝鐢變簬瀛樺湪濡備笅鍐沖畾鍏崇郴錛?br />
&nbsp;&nbsp;&nbsp;&nbsp; (浠撳簱ID) &#8594; (綆＄悊鍛業D)<br />
&nbsp;&nbsp;&nbsp;&nbsp; (綆＄悊鍛業D) &#8594; (浠撳簱ID)<br />
鍗沖瓨鍦ㄥ叧閿瓧孌靛喅瀹氬叧閿瓧孌電殑鎯呭喌錛屾墍浠ュ叾涓嶇鍚?BCNF鑼冨紡銆傚畠浼氬嚭鐜板涓嬪紓甯告儏鍐碉細<br />
&nbsp;&nbsp;&nbsp;&nbsp; (1) 鍒犻櫎寮傚父錛?br />
&nbsp;&nbsp;&nbsp;&nbsp; 褰撲粨搴撹娓呯┖鍚庯紝鎵�鏈?瀛樺偍鐗╁搧ID"鍜?鏁伴噺"淇℃伅琚垹闄ょ殑鍚屾椂錛?浠撳簱ID"鍜?綆＄悊鍛業D"淇℃伅涔熻鍒犻櫎浜嗐�?br />
&nbsp;&nbsp;&nbsp;&nbsp; (2) 鎻掑叆寮傚父錛?br />
&nbsp;&nbsp;&nbsp;&nbsp; 褰撲粨搴撴病鏈夊瓨鍌ㄤ換浣曠墿鍝佹椂錛屾棤娉曠粰浠撳簱鍒嗛厤綆＄悊鍛樸�?br />
&nbsp;&nbsp;&nbsp;&nbsp; (3) 鏇存柊寮傚父錛?br />
&nbsp;&nbsp;&nbsp;&nbsp; 濡傛灉浠撳簱鎹簡綆＄悊鍛橈紝鍒欒〃涓墍鏈夎鐨勭鐞嗗憳ID閮借淇敼銆?br />
&nbsp;&nbsp;&nbsp;&nbsp; 鎶婁粨搴撶鐞嗗叧緋昏〃鍒嗚В涓轟簩涓叧緋昏〃錛?br />
&nbsp;&nbsp;&nbsp;&nbsp; 浠撳簱綆＄悊錛歋torehouseManage(浠撳簱ID, 綆＄悊鍛業D)錛?br />
&nbsp;&nbsp;&nbsp;&nbsp; 浠撳簱錛歋torehouse(浠撳簱ID, 瀛樺偍鐗╁搧ID, 鏁伴噺)銆?br />
&nbsp;&nbsp;&nbsp;&nbsp; 榪欐牱鐨勬暟鎹簱琛ㄦ槸絎﹀悎BCNF鑼冨紡鐨勶紝娑堥櫎浜嗗垹闄ゅ紓甯搞�佹彃鍏ュ紓甯稿拰鏇存柊寮傚父銆?br />
<br />
<br />
鍘熷笘鍦板潃錛?<a >http://www.cublog.cn/u/23975/showart.php?id=391210</a></p><img src ="http://www.tkk7.com/kangdy/aggbug/344760.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.tkk7.com/kangdy/" target="_blank">AK47</a> 2011-02-21 14:45 <a href="http://www.tkk7.com/kangdy/archive/2011/02/21/344760.html#Feedback" target="_blank" style="text-decoration:none;">鍙戣〃璇勮</a></div>]]></description></item><item><title>鏁版嵁搴撲簨鍔＄畝浠?/title><link>http://www.tkk7.com/kangdy/archive/2009/11/11/301981.html</link><dc:creator>AK47</dc:creator><author>AK47</author><pubDate>Wed, 11 Nov 2009 09:23:00 GMT</pubDate><guid>http://www.tkk7.com/kangdy/archive/2009/11/11/301981.html</guid><wfw:comment>http://www.tkk7.com/kangdy/comments/301981.html</wfw:comment><comments>http://www.tkk7.com/kangdy/archive/2009/11/11/301981.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.tkk7.com/kangdy/comments/commentRss/301981.html</wfw:commentRss><trackback:ping>http://www.tkk7.com/kangdy/services/trackbacks/301981.html</trackback:ping><description><![CDATA[<p>浜嬪姟灝辨槸涓�緋誨垪鐨勬搷浣?榪欎簺鎿嶄綔瀹屾垚涓�欏逛換鍔?鍙榪欎簺鎿嶄綔閲屾湁涓�涓搷浣滄病鏈夋垚鍔?浜嬪姟灝辨搷浣滃け璐?鍙戠敓鍥炴粴浜嬩歡.鍗蟲挙娑堝墠闈㈢殑鎿嶄綔,榪欐牱鍙互淇濊瘉鏁版嵁鐨勪竴鑷存�?鑰屼笖鍙互鎶婃搷浣滄殏鏃舵斁鍦ㄧ紦瀛橀噷,絳夋墍鏈夋搷浣滈兘鎴愬姛鏈夋彁浜ゆ暟鎹簱,榪欐牱淇濊瘉璐規椂鐨勬搷浣滈兘鏄湁鏁堟搷浣? <br />
濡傛灉娌℃湁鐗規畩澹版槑錛屼簨鍔″氨鏄寚鏁版嵁搴撲簨鍔＄畝鍗曠殑璁插氨鏄鏁版嵁搴撹〃鐨勬坊鍔犮�佸垹闄ゃ�佷慨鏀瑰拰鏌ヨ鎿嶄綔銆?br />
浠庣紪紼嬬殑瑙掑害鏉ヨ浜嬪姟鍙敱紼嬪簭鍛樻潵璁劇疆,錛堜綍鏃跺紑鍚紝浣曟椂鎻愪氦錛屼綍鏃跺洖婊氾級濡傛灉娌℃湁璁劇疆鍒欐寜鏁版嵁搴撻粯璁よ嚜鍔ㄥ垝鍒嗕簨鍔°�傝�屼簨鍔℃渶緇堝湪鏁版嵁搴撲笂鎵ц.鎵�浠ヨ姹傛暟鎹簱鏀寔浜嬪姟銆?/p>
<p>浜嬪姟鍏鋒湁鍥涗釜鐗瑰緛錛氬師瀛愭�э紙 Atomicity 錛夈�佷竴鑷存�э紙 Consistency 錛夈�侀殧紱繪�э紙 Isolation 錛夊拰鎸佺畫鎬э紙 Durability 錛夈�傝繖鍥涗釜鐗規�х畝縐頒負 ACID 鐗規�с�?br />
1 銆佸師瀛愭�?br />
&nbsp;&nbsp;&nbsp; 浜嬪姟鏄暟鎹簱鐨勯�昏緫宸ヤ綔鍗曚綅錛屼簨鍔′腑鍖呭惈鐨勫悇鎿嶄綔瑕佷箞閮藉仛錛岃涔堥兘涓嶅仛<br />
2 銆佷竴鑷存�?nbsp; <br />
&nbsp;&nbsp;&nbsp; 浜嬪姟鎵ц鐨勭粨鏋滃繀欏繪槸浣挎暟鎹簱浠庝竴涓竴鑷存�х姸鎬佸彉鍒板彟涓�涓竴鑷存�х姸鎬併�傚洜姝ゅ綋鏁版嵁搴撳彧鍖呭惈鎴愬姛浜嬪姟鎻愪氦鐨勭粨鏋滄椂錛屽氨璇存暟鎹簱澶勪簬涓�鑷存�х姸鎬併�傚鏋滄暟鎹簱緋葷粺 榪愯涓彂鐢熸晠闅滐紝鏈変簺浜嬪姟灝氭湭瀹屾垚灝辮榪腑鏂紝榪欎簺鏈畬鎴愪簨鍔″鏁版嵁搴撴墍鍋氱殑淇敼鏈変竴閮ㄥ垎宸插啓鍏ョ墿鐞嗘暟鎹簱錛岃繖鏃舵暟鎹簱灝卞浜庝竴縐嶄笉姝ｇ‘鐨勭姸鎬侊紝鎴栬�呰鏄?涓嶄竴鑷寸殑鐘舵�併�?nbsp; <br />
3 銆侀殧紱繪�?br />
&nbsp;&nbsp;&nbsp; 涓�涓簨鍔＄殑鎵ц涓嶈兘鍏跺畠浜嬪姟騫叉壈銆傚嵆涓�涓簨鍔″唴閮ㄧ殑鎿嶄綔鍙婁嬌鐢ㄧ殑鏁版嵁瀵瑰叾瀹冨茍鍙戜簨鍔℃槸闅旂鐨勶紝騫跺彂鎵ц鐨勫悇涓簨鍔′箣闂翠笉鑳戒簰鐩稿共鎵般�?br />
4 銆佹寔緇�?br />
&nbsp;&nbsp; 涔熺О姘鎬箙鎬э紝鎸囦竴涓簨鍔′竴鏃︽彁浜わ紝瀹冨鏁版嵁搴撲腑鐨勬暟鎹殑鏀瑰彉灝卞簲璇ユ槸姘鎬箙鎬х殑銆傛帴涓嬫潵鐨勫叾瀹冩搷浣滄垨鏁呴殰涓嶅簲璇ュ鍏舵墽琛岀粨鏋滄湁浠諱綍褰卞搷銆?br />
&nbsp;&nbsp; <br />
鏁版嵁搴撶郴緇熸槸鍏佽澶氫釜鐢ㄦ埛鍏變韓鏁版嵁搴撹祫婧愶紝灝ゅ叾鏄涓敤鎴峰彲浠ュ悓鏃跺瓨鍙栫浉鍚屾暟鎹�傦紙澶氱敤鎴峰悓鏃跺涓�涓〃鎿嶄綔涔熷氨鏄茍鍙戯級<br />
鎴戜滑涓昏涓婅櫧涓嶆兂榪欎箞鍋氾紝鍙槸榪欑鎯呭喌鏄瓨鍦ㄧ殑錛屾病鏈夊師鍥犮�傝�屽茍鍙戜細鐮村潖浜嬪姟ACID鐗規�?錛堥殧紱繪�э紝涓�鑷存�э級銆?/p>
<p>騫跺彂浼氬甫鏉ヤ笅鍒楅棶棰橈細<br />
&nbsp;鑴忚錛氫竴涓簨鍔¤鍙栦簡鏈彁浜ょ殑浜嬪姟<br />
&nbsp;涓嶅彲閲嶅璇伙細鍚屼竴涓簨鍔′腑澶氭璇誨彇鍚屼竴涓暟鎹繑鍥炵殑緇撴灉涓嶅悓<br />
&nbsp;騫昏錛氫竴涓簨鍔¤鍙栧埌浜嗗彟涓�涓簨鍔″凡鎻愪氦鐨刬nsert鏁版嵁銆?br />
&nbsp;<br />
濡傛灉搴旂敤紼嬪簭浣跨敤瀹屽叏闅旂鐨勪簨鍔★紝閭ｄ箞鍚屾椂鎵ц澶氫釜浜嬪姟鐨勬晥鏋滃皢涓庝覆琛屾墽琛岋紙涓�涓帴涓�涓殑欏哄簭鎵ц錛夊畬鍏ㄧ瓑鏁堛�備負瑙ｅ喅浜嬪姟涔嬮棿鐨勫茍鍙戝甫鏉ョ殑涓棶棰橈紝蹇呴』鍦ㄤ簨鍔′箣闂村緩绔嬮殧紱誨叧緋伙紙浣跨敤闅旂綰у埆錛夈�?/p>
<p>浜嬪姟鐨勯殧紱葷駭鍒細灝辨槸瀵逛簨鍔″茍鍙戞帶鍒剁殑絳夌駭錛孉NSI/ISO SQL灝嗗叾鍒嗕負涓茶鍖栵紙SERIALIZABLE錛夈�佸彲閲嶅璇伙紙REPEATABLE READ錛夈�佽宸叉彁浜わ紙READ COMMITED錛夈�佽鏈彁浜わ紙READ UNCOMMITED錛夊洓涓瓑綰?br />
&nbsp;&nbsp;&nbsp; 1 Serializable錛氭渶涓ユ牸鐨勭駭鍒紝浜嬪姟涓茶鎵ц錛岃祫婧愭秷鑰楁渶澶э紱<br />
&nbsp;&nbsp;&nbsp; 2 REPEATABLE READ錛氳鍙栨暟鎹殑浜嬪姟鍏佽鍏朵粬浜嬪姟緇х畫璁塊棶璇ヨ鏁版嵁錛屼絾鏄湭鎻愪氦鐨勫啓浜嬪姟灝嗕細紱佹鍏朵粬浜嬪姟璁塊棶璇ヨ銆傞伩鍏嶄簡&#8220;鑴忚鍙?#8221;鍜?#8220;涓嶅彲閲嶅璇誨彇&#8221;鐨勬儏鍐碉紝浣嗘槸甯︽潵浜嗘洿澶氱殑鎬ц兘鎹熷け銆?br />
&nbsp;&nbsp;&nbsp; 3 READ COMMITTED:澶у鏁頒富嫻佹暟鎹簱鐨勯粯璁や簨鍔＄瓑綰э紝淇濊瘉浜嗕竴涓簨鍔′笉浼氳鍒板彟涓�涓茍琛屼簨鍔″凡淇敼浣嗘湭鎻愪氦鐨勬暟鎹紝閬垮厤浜?#8220;鑴忚鍙?#8221;銆傝綰у埆閫傜敤浜庡ぇ澶氭暟緋葷粺銆?br />
&nbsp;&nbsp;&nbsp; 4 Read Uncommitted錛氭渶浣庣殑浜嬪姟闅旂綰у埆,淇濊瘉浜嗚鍙栬繃紼嬩腑涓嶄細璇誨彇鍒伴潪娉曟暟鎹�?br />
<br />
<table width="500" border="0" cellpadding="2" cellspacing="2">
    <tbody>
        <tr>
            <td>&nbsp;&nbsp;&nbsp;&nbsp; 闅旂綰у埆</td>
            <td>&nbsp;&nbsp;&nbsp;&nbsp;鑴忚</td>
            <td>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 涓嶅彲閲嶅璇?/td>
            <td>&nbsp;&nbsp;&nbsp; 騫昏 </td>
        </tr>
        <tr>
            <td>&nbsp;&nbsp;&nbsp;&nbsp; Serializable</td>
            <td>&nbsp;&nbsp;&nbsp;&nbsp;涓嶄細</td>
            <td>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;涓嶄細</td>
            <td>&nbsp;&nbsp; &nbsp;涓嶄細</td>
        </tr>
        <tr>
            <td>&nbsp;&nbsp;&nbsp;&nbsp; REPEATABLE READ</td>
            <td>&nbsp;&nbsp;&nbsp;&nbsp;涓嶄細</td>
            <td>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;涓嶄細</td>
            <td>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 浼?/td>
        </tr>
        <tr>
            <td>&nbsp;&nbsp;&nbsp;&nbsp; READ COMMITTED</td>
            <td>&nbsp;&nbsp;&nbsp; 涓嶄細</td>
            <td>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 浼?/td>
            <td>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;浼?/td>
        </tr>
        <tr>
            <td>&nbsp;&nbsp;&nbsp;&nbsp; Read Uncommitted</td>
            <td>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 浼?/td>
            <td>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 浼?/td>
            <td>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;浼?/td>
        </tr>
    </tbody>
</table>
&nbsp;&nbsp; <br />
鏁版嵁搴撻噰鐢ㄩ攣鏈哄埗鏉ュ疄鐜頒簨鍔＄殑闅旂鎬с�?/p>
<p>&nbsp;鍏變韓閿侊細鍏變韓閿佺敤浜庤鍙栨暟鎹搷浣滐紝瀹冨厑璁稿叾浠栦簨鍔″悓鏃惰鍙栨煇閿佸畾鐨勮祫婧愶紝浣嗕笉鍏佽鍏朵粬浜嬪姟鏇存柊瀹冦�?br />
&nbsp;鎺掍粬閿侊細鎺掑畠閿佺敤浜庝慨鏀規暟鎹殑鍦哄悎銆傚畠閿佸畾鐨勮祫婧愶紝鍏朵粬浜嬪姟涓嶈兘璇誨彇涔熶笉鑳戒慨鏀廣�?br />
&nbsp;鏇存柊閿侊細鏇存柊閿佸湪鏇存柊鎿嶄綔鐨勫垵濮嬪寲闃舵鐢ㄦ潵閿佸畾鍙兘瑕佽淇敼鐨勮祫婧愶紝浠庤�岄伩鍏嶄嬌鐢ㄥ叡浜攣閫犳垚鐨勬閿佺幇璞?/p>
<p>甯歌鐨勫茍鍙戞帶鍒墮攣</p>
<p>http://hahalzb.blogbus.com/logs/19150842.html&nbsp;&nbsp; 蹇冩櫞鎬＄劧</p>
<fieldset><legend>寮曠敤錛?/legend>
<p><br />
涔愯閿?/p>
<p>澶勭悊騫跺彂鏇存柊鐨勪竴縐嶆柟寮忔槸浣跨敤涔愯閿侊紙optimistic locking錛夈�備箰瑙傞攣鐨勫伐浣滃師鐞嗘槸璁╁簲鐢ㄧ▼搴忔鏌ュ畠鍗沖皢鏇存柊鐨勬暟鎹槸鍚﹀凡琚彟涓�涓簨鍔′慨鏀癸紙鑷鏁版嵁涓婃璇誨彇浠ユ潵錛夈�傚疄鐜頒箰瑙傞攣鐨勪竴縐嶅父瑙佸仛娉曟槸鍦ㄦ瘡涓〃閲屾坊鍔犱竴涓増鏈瓧孌碉紝姣忔搴旂敤紼嬪簭鏇存柊鏁版嵁琛ㄨ褰曟椂灝卞鍔犺繖涓増鏈瓧孌點�傛瘡涓猆PDATE璇彞涓殑WHERE瀛愬彞浼氭牴鎹笂嬈¤鍙栫殑鍊兼潵鍒ゆ柇榪欎釜鐗堟湰鍙鋒槸鍚︽敼鍙樸�傞�氳繃鏌ョ湅PreparedStatement.executeUpdate()榪斿洖鐨勮褰曟暟錛屽簲鐢ㄧ▼搴忓彲浠ュ垽鏂璘PDATE璇彞鏄惁鎴愬姛銆傚鏋滆繖鏉¤褰曞凡琚彟涓�涓簨鍔℃洿鏂版垨鍒犻櫎錛屽簲鐢ㄧ▼搴忓彲浠ュ洖婊氳繖涓簨鍔★紝騫墮噸鏂板紑濮嬨�?br />
鍦ㄧ洿鎺ユ墽琛孲QL璇彞鐨勫簲鐢ㄧ▼搴忎腑錛屼箰瑙傞攣鏈哄埗鐨勫疄鐜伴潪甯稿鏄撱�備笉榪囷紝浣跨敤璇稿JDO鍜孒ibernate鐨勬寔涔呭眰鏋勬灦鏃訛紝瀹炵幇鏇翠負瀹規槗錛屽洜涓哄畠浠凡灝嗕箰瑙傞攣浣滀負閰嶇疆閫夐」鎻愪緵銆備竴鏃﹀惎鐢ㄨ閰嶇疆閫夐」錛屾寔涔呭眰妗嗘灦浼氳嚜鍔ㄧ敓鎴怱QL UPDATE璇彞錛屾墽琛岀増鏈鏌ャ�傜12绔犲皢鍒嗘瀽涔愯閿佺殑浣跨敤鏃舵満鍙婂叾緙虹偣錛屽茍鍚戜綘灞曠ず鎬庢牱鍦╥BATIS銆丣DO鍜孒ibernate涓嬌鐢ㄤ箰瑙傞攣銆?br />
涔愯閿佺殑鍚嶇О婧愯嚜濡備笅鍋囧畾鎯呭喌錛屽嵆騫跺彂鏇存柊鐨勫嚑鐜囨瀬灝忥紝姝ゅ搴旂敤紼嬪簭騫朵笉闃繪騫跺彂鏇存柊錛岃�屾槸媯�嫻嬪茍鍙戞洿鏂幫紝騫朵粠騫跺彂鏇存柊涓仮澶嶈繃鏉ャ�傚彟涓�縐嶆柟寮忔槸浣跨敤鎮茶閿侊紙pessimistic locking錛夛紝瀹冨亣瀹氬茍鍙戞洿鏂板皢浼氬彂鐢燂紝鍥犳蹇呴』棰勫厛闃繪銆?/p>
<p>鎮茶閿?/p>
<p>涓嶅悓浜庝箰瑙傞攣鐨勫彟涓�縐嶆柟寮忔槸浣跨敤鎮茶閿併�傚綋璇誨彇鏌愪簺璁板綍鏃訛紝浜嬪姟鍏堥攣浣忚繖浜涜褰曪紝榪欐牱鍙互闃叉鍏朵粬浜嬪姟璁塊棶榪欎簺鏁版嵁璁板綍銆傚叿浣撶粏鑺傝瑙嗘暟鎹簱鑰屽畾錛屼笉榪囩碂緋曠殑鏄紝騫墮潪鎵�鏈夋暟鎹簱閮芥敮鎸佹偛瑙傞攣銆傚鏋滄暟鎹簱鏀寔鎮茶閿侊紝鍦ㄧ洿鎺ユ墽琛孲QL璇彞鐨勫簲鐢ㄧ▼搴忎腑錛屽疄鐜版偛瑙傞攣闈炲父<br />
瀹規槗銆傜劧鑰岋紝姝ｅ浣犳墍棰勬枡鐨勶紝鍦↗DO鎴朒ibernate搴旂敤紼嬪簭涓嬌鐢ㄦ偛瑙傞攣鏇翠負瀹規槗銆侸DO浠ラ厤緗�夐」鐨勬柟寮忔彁渚涙偛瑙傞攣錛岃�孒ibernate鍒欐彁渚涗竴涓畝鍗曞疄鐢ㄧ殑API錛屾潵閿佸畾瀵硅薄銆傚悓鏍鳳紝鍦ㄧ12绔狅紝浣犲皢瀛︿範浣曟椂浣跨敤鎮茶閿侊紝鍒嗘瀽鍏剁己鐐癸紝騫剁湅鐪嬫�庢牱鍦╥BATIS銆丣DO鍜孒ibernate涓嬌鐢ㄦ偛瑙傞攣銆?br />
</p>
</fieldset>
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