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鍦ㄧ瀛﹀拰宸ョ▼鎶�鏈鍩燂紝妯″瀷鏄竴涓緢鏈夌敤閫旂殑姒傚康錛屽畠鍙互鐢ㄦ潵妯℃嫙涓�涓湡瀹炵殑緋葷粺銆傚湪杞歡寮�鍙戦鍩燂紝妯″瀷鐢ㄦ潵琛ㄧず鐪熷疄涓栫晫鐨勫疄浣撱�傚湪杞歡寮�鍙戠殑涓嶅悓闃舵錛?
闇�瑕佷負(fù)鐩爣緋葷粺鍒涘緩涓嶅悓綾誨瀷鐨勬ā鍨嬨�傚湪鍒嗘瀽闃舵錛岄渶瑕佸垱寤烘蹇墊ā鍨嬨�傚湪璁捐闃舵錛岄渶瑕佸垱寤哄煙妯″瀷鍜屾暟鎹ā鍨嬨�傚叾涓紝鍩熸ā鍨嬫槸闈㈠悜瀵硅薄鐨勶紝鏁版嵁妯″瀷鏄潰鍚戝叧
緋葷殑錛屽煙妯″瀷鍜屾暟鎹ā鍨嬩箣闂村瓨鍦ㄤ竴縐嶅璞?鍏崇郴鏄犲皠銆?br><br><b>姒傚康妯″瀷</b><br><br>&nbsp;
&nbsp;&nbsp;&nbsp;姒傚康妯″瀷娓呮鍦版樉紺轟簡(jiǎn)闂鍩熶腑鐨勫疄浣撱�備笉綆℃槸鎶�鏈漢鍛樿繕鏄潪鎶�鏈漢鍛橀兘鑳界湅寰楁噦鏀歸潰妯″瀷錛屼粬浠彲浠ュ緢瀹規(guī)槗鍦版彁鍑烘ā鍨?
涓瓨鍦ㄧ殑闂錛屽府鍔╁垎鏋愪漢鍛樺強(qiáng)鏃╁妯″瀷榪涜淇敼銆傚湪杞歡璁捐鍩熷紑鍙戝懆鏈熶腑錛屾ā鍨嬬殑鍙樻洿闇�姹傛彁鍑哄緱瓚婃櫄錛屾墍鑰楄垂寰楀紑鍙戞垚鏈氨瓚婂ぇ銆?br><br>&nbsp;
&nbsp;&nbsp;&nbsp;姒傚康妯″瀷鎻忚堪浜?jiǎn)姣忎釜瀹炰綋寰楁蹇靛拰灞炴�э紝浠ュ強(qiáng)瀹炰綋涔嬮棿鐨勫叧緋伙細(xì)涓�瀵逛竴銆佷竴瀵瑰鍜屽瀵瑰銆傚湪鐜板疄鐢熸椿涓兘鍙互鎵懼埌鐩稿簲鐨?
渚嬪瓙錛屼緥濡備竴鍙瘝楦℃湁寰堝灝忛浮鏄竴瀵瑰鍏崇郴錛屼竴浣嶅鎴烽�夎喘浜?jiǎn)寰堝鍟嗗搧锛岃�岃繖浜涘晢鍝佷篃鍙互琚澶氬鎴烽�夎喘錛岃繖鏄瀵瑰鍏崇郴銆?br><br><b>鍏崇郴鏁版嵁妯″瀷</b><br><br>&nbsp;&nbsp;&nbsp;&nbsp;鍒扮洰鍓嶄負(fù)姝紝鍏崇郴鏁版嵁搴撲粛鐒舵槸浣跨敤鏈�騫挎硾鐨勬暟鎹簱錛屽畠瀛樺偍鐨勬槸鍏崇郴鏁版嵁銆傚叧緋繪暟鎹ā鍨嬫槸鍦ㄦ蹇墊ā鍨嬬殑鍩虹涓婂緩绔嬭搗鏉ョ殑錛岀敤浜庢弿榪拌繖浜涘叧緋繪暟鎹殑闈?rùn)鎬佺粨鏋勶紝瀹冪敱浠ヤ笅鍐呭緇勬垚錛?br><br>&nbsp;&nbsp;&nbsp;&nbsp;涓�涓垨澶氫釜琛?br>&nbsp;&nbsp;&nbsp;&nbsp;琛ㄧ殑鎵�鏈夌儲(chǔ)寮?br>&nbsp;&nbsp;&nbsp;&nbsp;瑙嗗浘<br>&nbsp;&nbsp;&nbsp;&nbsp;瑙﹀彂鍣?br>&nbsp;&nbsp;&nbsp;&nbsp;琛ㄤ笌琛ㄤ箣闂寸殑鍙傜収瀹屾暣鎬?br><br>&nbsp;
&nbsp;&nbsp;&nbsp;鏁版嵁搴揝chema鏄鏁版嵁妯″瀷鐨勫疄鐜般�傚浜庢敮鎸丼QL鐨勫叧緋繪暟鎹簱錛屽彲浠ラ噰鐢⊿QL&nbsp;DDL璇█鏉ュ垱寤?
鏁版嵁搴揝chema銆係QL&nbsp;DDL&nbsp;鐢ㄤ簬鐢熸垚鏁版嵁搴撲腑鐨勭墿鐞嗗疄浣擄紝渚嬪涓嬮潰鐨勫垱寤篊USTOMERS琛ㄧ殑&nbsp;
SQL&nbsp;DDL錛?br><br>&nbsp;&nbsp;&nbsp;&nbsp;create&nbsp;table&nbsp;CUSTOMERS&nbsp;{<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;ID&nbsp;int&nbsp;not&nbsp;null,<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;NAME&nbsp;varchar(20),<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;AGE&nbsp;int,<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;primary&nbsp;key&nbsp;(ID)<br>&nbsp;&nbsp;&nbsp;&nbsp;};<br><br>&nbsp;&nbsp;&nbsp;&nbsp;
鍊煎緱娉ㄦ剰鐨勬槸錛屾暟鎹簱Schema鏈変袱縐嶅惈涔夛紝涓�縐嶆槸姒傚康涓婄殑Schema錛屾寚鐨勬槸涓�緇凞DL璇彞闆嗭紝璇ヨ鍙ラ泦瀹屾暣鍦版弿榪頒簡(jiǎn)鏁版嵁搴撶殑緇撴瀯銆傝繕鏈変竴縐嶆槸鐗╃悊
涓婄殑Schema錛屾寚鐨勬槸鏁版嵁搴撲腑鐨勪竴涓悕瀛楃┖闂達(dá)紝瀹冨寘鍚竴緇勮〃銆佽鍥懼拰瀛樺偍榪囩▼絳夊懡鍚嶅璞°�傜墿鐞哠chema鍙互閫氳繃鏍囧噯SQL璇彞鏉ュ垱寤恒�佹洿鏂板拰淇?
鏀廣�備緥濡備互涓婼QL璇彞鍒涘緩浜?jiǎn)涓や釜鐗╃悊Schema錛?br><br>&nbsp;&nbsp;&nbsp;&nbsp;create&nbsp;schema&nbsp;SCHEMA_A;<br>&nbsp;&nbsp;&nbsp;&nbsp;create&nbsp;table&nbsp;SCHEMA_A.CUSTOMERS(ID&nbsp;int&nbsp;not&nbsp;null,鈥︹�?;<br><br>&nbsp;&nbsp;&nbsp;&nbsp;create&nbsp;schema&nbsp;SCHEMA_B;<br>&nbsp;&nbsp;&nbsp;&nbsp;create&nbsp;table&nbsp;SCHEMA_B.CUSTOMERS(ID&nbsp;int&nbsp;not&nbsp;null,鈥︹�?;<br><br><b>鍩熸ā鍨?/b><br><br>&nbsp;&nbsp;&nbsp;&nbsp;鍩熸ā鍨嬬敱浠ヤ笅鍐呭緇勬垚錛氬叿鏈夌姸鎬佸拰琛屼負(fù)鐨勫煙瀵硅薄錛涘煙瀵硅薄涔嬮棿鐨勫叧緋匯�?br><br>鍩熷璞?br><br>1.瀹炰綋鍩熷璞★細(xì)浠ｈ〃浜恒�佸湴鐐廣�佷簨鐗╂垨姒傚康銆傞�氬父錛屽彲浠ユ妸涓氬姟棰嗗煙涓殑鍚嶈瘝錛屼緥濡傚鎴楓�佽鍗曘�佸晢鍝侊紝褰撶劧涔熷寘鎷墠闈㈡彁鍒拌繃鐨勬瘝楦★紝浣滀負(fù)瀹炰綋鍩熷璞★紱<br>2.榪囩▼鍩熷璞★細(xì)浠ｈ〃搴旂敤涓殑涓氬姟閫昏緫鎴栨祦紼嬨�傚畠閫氬父渚濊禆浜庡疄浣撳煙瀵硅薄銆?br>3.浜嬩歡鍩熷璞★細(xì)浠ｈ〃搴旂敤涓殑涓�浜涗簨浠訛紝渚嬪寮傚父銆佽鍛婃垨瓚呮椂絳夈�?br><br>鍩熷璞′箣闂寸殑鍏崇郴<br><br>&nbsp;&nbsp;&nbsp;&nbsp;鍦ㄥ煙妯″瀷涓紝綾諱箣闂村瓨鍦ㄥ洓縐嶅叧緋匯�?br><br>1.鍏寵仈(Association)<br>&nbsp;&nbsp;&nbsp;<br>&nbsp;&nbsp;&nbsp;&nbsp;鍏寵仈鎸囩殑鏄被涔嬮棿鐨勫紩鐢ㄥ叧緋伙紝榪欐槸瀹炰綋鍩熷璞′箣闂存渶鏅亶鐨勪竴縐嶅叧緋匯�傚叧鑱斿彲浠ュ垎涓轟竴瀵逛竴銆佷竴瀵瑰鍜屽瀵瑰鍏寵仈銆?br><br>2.渚濊禆(Dependency)<br><br>&nbsp;&nbsp;&nbsp;&nbsp;渚濊禆鎸囩殑鏄被涔嬮棿鐨勮闂叧緋匯�傚鏋滅被A璁塊棶綾籅鐨勫睘鎬ф垨鏂規(guī)硶錛屾垨鑰呰鏄疉璐熻矗瀹炰緥鍖朆錛岄偅涔堝彲浠ヨ綾籄渚濊禆綾籅銆?br><br>3.鑱氶泦(Aggregation)<br><br>&nbsp;&nbsp;&nbsp;&nbsp;鑱氶泦鎸囩殑鏄暣浣撲笌閮ㄥ垎涔嬮棿鐨勫叧緋伙紝鍦ㄥ疄浣撳煙瀵硅薄涔嬮棿涔熷緢甯歌銆備緥濡傦紝浜轟笌鎵嬪氨鏄仛闆嗗叧緋伙紝鍦≒erson綾諱腑鐢變竴涓猦ands闆嗗悎錛屽畠瀛樻斁琚仛闆嗙殑Hand瀵硅薄錛?br><br>&nbsp;&nbsp;&nbsp;&nbsp;public&nbsp;class&nbsp;Person&nbsp;{<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;private&nbsp;Set&nbsp;hands&nbsp;=&nbsp;new&nbsp;HashSet();<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;鈥︹�︹�︹�?br>&nbsp;&nbsp;&nbsp;&nbsp;}<br><br>4.涓�鑸寲(Generalization)<br><br>&nbsp;&nbsp;&nbsp;&nbsp;涓�鑸寲鎸囩殑鏄被涔嬮棿鐨勭戶鎵垮叧緋匯�?br><br>鍩熷璞＄殑鎸佷箙鍖栨蹇?br><br>&nbsp;
&nbsp;&nbsp;&nbsp;褰撳疄浣撳煙瀵硅薄鍦ㄥ唴瀛樹(shù)腑鍒涘緩鍚庯紝瀹冧滑涓嶅彲鑳芥案榪滃瓨鍦ㄣ�傛渶鍚庯紝浠栦滑瑕佷箞浠庡唴瀛樹(shù)腑娓呴櫎錛岃涔堣鎸佷箙鍖栧埌鏁版嵁瀛樺偍搴撲腑銆傚唴瀛?
鏃犳硶姘鎬箙鍦頒繚瀛樻暟鎹紝鍥犳蹇呴』瀵瑰疄浣撳煙瀵硅薄榪涜鎸佷箙鍖栥�傚惁鍒欙紝濡傛灉瀵硅薄娌℃湁琚寔涔呭寲錛岀敤鎴峰湪搴旂敤榪愯鏃跺垱寤哄湴璁㈠崟淇℃伅灝嗗湪搴旂敤緇撴潫榪愯鍚庨殢涔嬫秷澶便�?br><br>&nbsp;&nbsp;&nbsp;&nbsp;褰撶劧錛屽茍涓嶆槸鎵�鏈夊湴鍩熷璞￠兘闇�瑕佹寔涔呭寲錛岄�氬父鍙湁瀹炰綋鍩熷璞℃墠闇�瑕佹寔涔呭寲錛屽彟澶栵紝鏈変簺瀹炰綋鍩熷璞′篃涓嶉渶瑕佹寔涔呭寲銆?br><br>&nbsp;&nbsp;&nbsp;&nbsp;鐙箟鐨勭悊瑙ｏ紝鈥滄寔涔呭寲鈥濅粎浠呮寚鎶婂煙瀵硅薄姘鎬箙淇濆瓨鍒版暟鎹簱涓紱騫夸箟鐨勭悊瑙ｏ紝鈥滄寔涔呭寲鈥濆寘鎷拰鏁版嵁搴撶浉鍏崇殑鍚勭鎿嶄綔銆?/font><img src ="http://m.tkk7.com/shuimudaoliang/aggbug/28892.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://m.tkk7.com/shuimudaoliang/" target="_blank">shuimudaoliang</a> 2006-01-21 20:40 <a href="http://m.tkk7.com/shuimudaoliang/archive/2006/01/21/28892.html#Feedback" target="_blank" style="text-decoration:none;">鍙戣〃璇勮</a></div>]]></description></item></channel></rss>                                     <footer>
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