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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″瀷鎻忚堪浜嗘瘡涓疄浣撳緱姒傚康鍜屽睘鎬э紝浠ュ強瀹炰綋涔嬮棿鐨勫叧緋伙細涓�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�夎喘浜嗗緢澶氬晢鍝侊紝鑰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殑闈欐�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彞鍒涘緩浜嗕袱涓墿鐞哠chema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★紝浣滀負瀹炰綋鍩熷璞★紱<br>2.榪囩▼鍩熷璞★細浠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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