锘??xml version="1.0" encoding="utf-8" standalone="yes"?> 榪樻湁浠涔堝叾瀹冪殑鎻愬崌鎬ц兘鐨勬柟寮忓笇鏈涘拰澶у涓璧瘋璁恒?/FONT>
璁稿杞歡璁捐鐨勬濈淮閮芥簮浜庣敓媧葷殑鏂規(guī)柟闈㈤潰錛屽彲鑳藉瓨鍦ㄦ煇浜涜璁℃濇兂騫墮潪鍙楀鉤鏃剁敓媧繪墍鍚開錛屼絾瀹冧滑闈復鐨勬儏鍐靛嵈濡傛鐩歌薄銆傝蔣浠惰璁″師鏈氨鏄敓媧葷殑涓閮ㄥ垎錛岃蔣浠惰璁$殑鈥滅伒媧燴濅笌鈥滄柟渚庫?鎴栤滅畝渚庫?鍗蟲槸涓栫晫涓囩墿鐨勪竴涓叡鍚岀偣銆?BR>
Hibernate浣滀負嫻佽鐨勪紒涓氬簲鐢ㄥ拰鍏崇郴鏁版嵁搴撲箣闂寸殑鎸佷箙鍖栦腑闂翠歡錛屽彈鍒拌秺鏉ヨ秺澶氱殑鍏蟲敞銆傝櫧鐒朵嬌鐢℉ibernate鍙互浣垮緱欏圭洰鏄撲簬緇存姢錛屽府鍔╁紑鍙戜漢鍛樻洿濂藉湴澶勭悊澶嶆潅鍏崇郴妯″瀷錛屾彁渚涗簡寰堝己鐨勬柟渚挎э紝浣嗗嵈澶卞幓浜咼DBC鍘熸湁鐨勭伒媧繪с傚浣曞湪鈥滅伒媧燴濅笌鈥滄柟渚庫濅箣闂村彇鑸嶃佸鉤琛℃樉寰楅噸瑕佽搗鏉ャ?BR>
涓嶄箙鍓?A href="/calvin/">姹熷崡鐧借。鐨勪竴綃囨枃绔?A id=viewpost1_TitleUrl href="/calvin/archive/2006/01/05/26791.html">ORM閫忔槑鎸佷箙鍖栨柟妗堥潰瀵圭殑鍏卞悓鍥板閬撳嚭浜嗙幇鍦∣RM涓嶅敖濡備漢鎰忕殑鍦版柟錛岄櫎浜嗙綉涓婏紝榪樻湁涔︽湰鐨勫墠璦絳夊Hibernate鐨勪紬澶氳禐緹庝箣璇嶅錛岀幇鍦ㄨ璁哄畠鍛嗘澘銆侀厤緗箒鐞愮殑澹伴煶涔熼愭笎澶氫簡璧鋒潵錛屾渶鐑椆鐨勫氨鏄墠孌墊椂闂?A >Ruby on Rails寮曡搗J2EE闃佃惀鐨勯獨鍔ㄣ備釜浜哄Java鐮旂┒灝氭祬錛屽Hibernate鏈変竴浜涗嬌鐢ㄥ績寰楋紝涓嬮潰鎵鍒楀嚭鐨勪笉涓瀹氭槸Hibernate鏈韓鐨勭己闄鳳紝涓嶈凍涔嬪甯屾湜澶у鎷嶇爾鎸囧嚭銆?BR>
1. 鎻愬彇琛ㄥ崟涓瓧鍏竀alue鐨勪笉渚褲?BR> 瀛楀吀涓鑸敱ID鍜孨AME涓や釜瀛楁緇勬垚錛屽叾ID鍙峰瓨鍌ㄤ簬鏁版嵁搴撳叾浠栬〃涓紝褰撴煡璇㈣繖浜涜〃淇℃伅鏃訛紝Hibernate浠ist鎴朣et褰㈠紡榪斿洖鐨勭粨鏋滐紝娌℃湁鍔炴硶灝咺D鍙鋒樉紺轟負瀵瑰簲鐨凬AME銆傚湪JDBC涓紝鍙互鐩存帴閫氳繃Map鏉ュ瓨鍌ㄥ瓧鍏革紝閫氳繃map.getValue()鏉ヨ繑鍥炲瓧鍏哥殑鍊箋?BR>
2. Hibernate鍐呯疆鏄犲皠綾誨瀷澶嶆潅鍖?BR> 鍦ㄥ紑鍙戣繃紼嬩腑錛屾椂甯鎬細鏌ユ壘Hibernate鏄犲皠綾誨瀷--Java綾誨瀷--鏍囧噯SQL綾誨瀷涔嬮棿鐨勫叧緋匯傜箒鏉備箣澶勪綋鐜板湪涓ゆ柟闈紝涓鏄悇縐嶆暟鎹簱鐨勬暟鎹被鍨嬪拰鏍囧噯SQL涔嬮棿浼氭湁涓瀹氱殑鍑哄叆錛屼簩鏄疕ibernate鏄犲皠綾誨瀷铏界劧澶ч儴鍒嗗拰Java綾誨瀷鐩稿悓錛屼絾涔熷瓨鍦ㄦ瘮杈冩櫐娑╃殑鍦版柟錛屼緥濡俢haracter綾誨瀷瀵瑰簲Java鐨刢har / java.lang.Character / java.lang.String錛宼ext瀵瑰簲鐫Java鐨刯ava.lang.String銆?BR>
3. ID瑙勫畾鍖栫敓鎴?BR> Hibernate涓唴緗爣璇嗙鐢熸垚鍣ㄧ粰琛ㄥ崟ID鑷姩鐢熸垚鎻愪緵浜嗘柟渚匡紝浣嗗嵈涓嶈兘鑷畾涔夊悇縐岻D褰㈠紡銆傚紑鍙戣繃紼嬩腑錛屾湁鏃墮渶瑕佺壒瀹氱殑ID鍙鋒潵鍖哄垎鍚勭瀛楀吀錛屼緥濡傚瓧鍏?鐨処D鍙蜂負1A錛?A鈥︹︼紝瀛楀吀2鐨処D鍙蜂負1B錛?B鈥︹︼紝褰撹繖浜汭D鍙峰瓨鍌ㄥ湪琛ㄥ崟涓椂錛屽彲浠ユ柟渚垮紑鍙戜漢鍛樺湪鏁版嵁搴撲腑鏌ユ壘鍚勮〃鍗曞瓨鍌ㄥ悇綾誨瓧鍏告暟鎹殑鎯呭喌錛屾柟渚胯皟璇曪紝浣嗕嬌鐢℉ibernate鐢熸垚鍣ㄥ氨澶卞幓浜嗚繖縐嶇伒媧繪с?BR>
Hibernate鐨勪笉瓚?/FONT>緗戜笂宸叉湁寰堝璁ㄨ錛屼互涓婂彧鏄釜浜哄鍔犵殑鍑犵偣浣撲細銆傚嵆浣胯繖鏍鳳紝Hibernate浠嶆槸涓嬈句紭縐鐨勬寔涔呭眰鎻掍歡錛屽彧鏄滅伒媧燴濈殑鑳屽悗闅愯棌鐫鈥滃鏉傗濓紝鈥滄柟渚庫濈殑鑳屽悗闅愯棌鐫鈥滀笉渚庫濓紝濡備綍鍙栬垗涓庡鉤琛★紝榪樻槸鐪嬪疄闄呴渶瑕佸惂銆?/FONT>
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鍦ㄤ嬌鐢℉ibernate榪涜鏌ヨ鐨勬椂鍊欏ぇ瀹墮兘浼氱敤鍒癏ibernate緙撳瓨錛屽叾涓璖ession緙撳瓨鍗充竴鍧楀唴瀛樼┖闂達紝瀛樻斁浜嗙浉浜掑叧鑱旂殑Java瀵硅薄錛岃繖浜涗綅浜嶴ession緙撳瓨涓殑瀵硅薄灝辨槸鎸佷箙鍖栧璞★紝Session鏍規(guī)嵁鎸佷箙鍖栧璞$殑鐘舵佸彉鍖栨潵鍚屾鏇存柊鏁版嵁搴撱傝繖涓猄ession緙撳瓨鏄疕ibernate鐨勪竴綰х紦瀛樸傛澶栵紝SessionFactory鏈変竴涓唴緗紦瀛樺拰涓涓緗紦瀛橈紝鍗矵ibernate鐨勭浜岀駭緙撳瓨銆傝孒ibernate姝f槸鐢變簬榪欎簺緙撳瓨鐨勫瓨鍦紝鎵嶄嬌寰楀叾鏁版嵁搴撴搷浣滄晥鐜囨彁楂橈紝灝辨槸璇達紝鍦ㄦ彁渚涗簡鏂逛究鏄撴搷浣滅殑鎿嶄綔鏁版嵁搴撴暟鎹殑鏂瑰紡鐨勫悓鏃朵繚璇佷簡宸ヤ綔鏁堢巼錛屼絾鏄笉鑳藉洜姝よ屽厤鍘誨悗欏句箣蹇э紝闇瑕佸湪璁捐涓氬姟閫昏緫灞傜殑鏃跺欒冭檻浣跨敤鏈浼樼殑鏋舵瀯錛岃妭鐪佹湁鏁堢殑緋葷粺璧勬簮銆傚湪鏌ヨ鏂歸潰錛孒ibernate涓昏浠庝互涓嬪嚑涓柟闈㈡潵浼樺寲鏌ヨ鎬ц兘錛?BR>
1.闄嶄綆璁塊棶鏁版嵁搴撶殑棰戠巼錛屽噺灝憇elect璇彞鐨勬暟鐩傚疄鐜版墜孌靛寘鎷細
浣跨敤榪垏宸﹀榪炴帴鎴栬揩鍒囧唴榪炴帴媯绱㈢瓥鐣ャ?BR> 瀵瑰歡榪熸绱㈡垨绔嬪嵆媯绱㈢瓥鐣ヨ緗壒閲忔绱㈡暟鐩?BR> 浣跨敤鏌ヨ緙撳瓨銆?BR>
2.閬垮厤澶氫綑鍔犺澆紼嬪簭涓嶉渶瑕佽闂殑鏁版嵁銆傚疄鐜版墜孌靛寘鎷細
浣跨敤寤惰繜媯绱㈢瓥鐣ャ?BR> 浣跨敤闆嗗悎榪囨護銆?BR>
3.閬垮厤鎶ヨ〃鏌ヨ鏁版嵁鍗犵敤緙撳瓨銆傚疄鐜版墜孌典負鍒╃敤鎶曞獎鏌ヨ鍔熻兘錛屾煡璇㈠嚭瀹炰綋鐨勯儴鍒嗗睘鎬с?BR>
4.鍑忓皯select璇彞涓殑瀛楁錛屼粠鑰岄檷浣庤闂暟鎹簱鐨勬暟鎹噺銆傚疄鐜版墜孌典負鍒╃敤Query鐨刬terate()鏂規(guī)硶銆?BR>
鍦ㄦ彃鍏ュ拰鏇存柊鏁版嵁鏃訛紝瑕佹帶鍒秈nsert鍜寀pdate璇彞錛屽悎鐞嗚緗槧灝勫睘鎬ф潵淇濊瘉鎻掑叆鏇存柊鐨勬ц兘錛屼緥濡傦紝褰撹〃涓寘鍚澶氬瓧孌墊椂錛屽緩璁妸dynamic-update灞炴у拰dynamic-update灞炴ч兘璁句負true錛岃繖鏍峰湪insert鍜寀pdate璇彞涓氨鍙寘鍚渶瑕佹彃鍏ユ垨鏇存柊鐨勫瓧孌碉紝榪欏彲浠ヨ妭鐪佹暟鎹簱鎵цSQL璇彞鐨勬椂闂達紝浠庤屾彁楂樺簲鐢ㄧ殑榪愯鎬ц兘銆?/FONT>
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鍦ㄥ叧緋繪暟鎹簱涓殑涓婚敭鍙垎涓鴻嚜鐒朵富閿?鍏鋒湁涓氬姟鍚箟)鍜屼唬鐞嗕富閿?涓嶅叿鏈変笟鍔″惈涔?錛屽叾涓唬鐞嗕富閿彲浠ラ傚簲涓嶆柇鍙樺寲鐨勪笟鍔¢渶姹傦紝鍥犳鏇村姞嫻佽銆備唬鐞嗕富閿氬父涓烘暣鏁扮被鍨嬶紝涓庢瀵瑰簲錛屽湪鎸佷箙鍖栫被涓噹搴旇鎶奜ID瀹氫箟涓烘暣鏁扮被鍨嬶紝Hibernate鍏佽鎶奜ID瀹氫箟涓簊hort銆乮nt鍜宭ong綾誨瀷錛屼互鍙婂畠浠殑鍖呰綾誨瀷銆?BR>
Hibernate鎻愪緵浜嗗嚑縐嶅唴緗爣璇嗙鐢熸垚鍣紝姣忎竴縐嶆爣璇嗙鐢熸垚鍣ㄩ兘鏈夊畠鐨勪嬌鐢ㄨ寖鍥達紝搴旇鏍規(guī)嵁鎵浣跨敤鐨勬暟鎹簱鍜孒ibernate搴旂敤鐨勮蔣浠舵灦鏋勬潵閫夋嫨鍚堥傜殑鏍囪瘑絎︾敓鎴愬櫒銆備笅闈㈡槸鍑犵甯哥敤鏁版嵁搴撶郴緇熷彲浣跨敤鐨勬爣璇嗙鐢熸垚鍣細
MYSQL: identity increment hilo native
MS SQL Server: identity increment hilo native
Oracle: sequence seqhilo hilo increment native
澶稿鉤鍙板紑鍙? native
OID鏄負鎸佷箙鍖栧眰鏈嶅姟鐨勶紝瀹冧笉鍏峰涓氬姟鍚箟錛岃屽煙瀵硅薄浣嶄簬涓氬姟閫昏緫灞傦紝鐢ㄦ潵鎻忚堪涓氬姟妯″瀷銆傚洜姝わ紝鍦ㄥ煙瀵硅薄涓己琛屽姞鍏ヤ笉鍏峰涓氬姟鍚箟鐨凮ID錛屽彲浠ョ湅浣滄槸鎸佷箙鍖栧眰瀵逛笟鍔¢昏緫灞傜殑涓縐嶆笚閫忥紝浣嗚繖縐嶆笚閫忔槸涓嶅彲閬垮厤鐨勶紝鍚﹀垯Hibernate灝辨棤娉曞緩绔嬬紦瀛樹腑鐨勫璞′笌鏁版嵁搴撲腑璁板綍鐨勫搴斿叧緋匯?BR>
褰撶劧錛屾槧灝勪腑榪樺寘鎷嚜鐒朵富閿殑鏄犲皠鏂規(guī)銆傚浜庝粠澶磋璁$殑鍏崇郴鏁版嵁搴撴ā鍨嬶紝搴旇浼樺厛鑰冭檻浣跨敤浠g悊涓婚敭銆?/FONT>
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鍦ㄧ綉涓婂緢澶氭枃绔犲拰璁哄潧閮藉湪璁ㄨHibernate錛屽垵嬈℃帴瑙ibernate錛屽綋鐒墮渶瑕佺煡閬撳畠鏄粈涔堬紝鍙互鐢ㄦ潵鍋氫粈涔堛傜敤綆鍗曠殑璇█鏉ユ弿榪幫紝鍙互璁や負Hibernate鏄細
瀹冩槸榪炴帴Java搴旂敤紼嬪簭鍜屽叧緋繪暟鎹簱鐨勪腑闂翠歡銆?BR> 瀹冨JDBC API榪涜浜嗗皝瑁咃紝璐熻矗Java瀵硅薄鐨勬寔涔呭寲銆?BR> 鍦ㄥ垎灞傜殑杞歡鏋舵瀯涓畠浣嶄簬鎸佷箙鑺卞眰錛屽皝瑁呬簡鎵鏈夋暟鎹闂粏鑺傦紝浣夸笟鍔¢昏緫灞傚彲浠ヤ笓娉ㄤ簬瀹炵幇涓氬姟閫昏緫銆?BR> 瀹冩槸涓縐峅RM(Object-Relation Mapping)鏄犲皠宸ュ叿錛岃兘澶熷緩绔嬮潰鍚戝璞$殑鍩熸ā鍨嬪拰鍏崇郴鏁版嵁搴撴ā鍨嬩箣闂寸殑鏄犲皠銆?BR>
鍦↗ava搴旂敤涓嬌鐢℉ibernate鍖呭惈浠ヤ笅姝ラ錛?BR>
1.鍒涘緩Hibernate鐨勯厤緗枃浠躲?BR>2.鍒涘緩鎸佷箙鍖栫被銆?BR>3.鍒涘緩瀵硅薄-鍏崇郴鏄犲皠鏂囦歡銆?BR>4.閫氳繃Hibernate API緙栧啓璁塊棶鏁版嵁搴撶殑浠g爜銆?/FONT>
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1.棣栧厛灝唄ibernate2.jar鏇挎崲涓篽ibernate3.jar(hibernate-3.0.5)
hibernate-tools.jar涔熸浛鎹㈡垚鏂扮殑(浠巋ibernate-tools-3.0.0.alpha4a鎵懼嚭鏉ョ殑)
2.灝嗘墍鏈夌▼搴忎腑鐨刵et.sf.hibernate鏇挎崲涓簅rg.hibernate.
3.浣嗘槸鏈変緥澶?BR> net.sf.hibernate.expression.Expression鎹負org.hibernate.criterion.Expression
濡傛灉鐢╡clipse,鐢╟trl+shift+o蹇嵎閿彲浠ュ姞蹇熷害
4.鍦ㄤ嬌鐢╤ql鏌ヨ鏃跺皢
createSQLQuery(hql,"c",EZCampaignDTO.class);鏀逛負createSQLQuery(hql).addEntity("c",EZCampaignDTO.class);
5.鍦ㄦ壒閲忔彃鍏ユ椂
灝嗗師鏉ョ殑int size = ((SessionFactoryImpl)(session.getSessionFactory())).getJdbcBatchSize()
鏀逛負int size = ((SessionFactoryImpl)(session.getSessionFactory())).getSettings().getJdbcBatchSize();
6.鍦ㄨ綆梒ount鏃?BR> 灝嗗師鏉ョ殑int size = ((Integer) session.iterate(hql).next()).intValue();
鏀逛負int size = ((Integer) session.createQuery(hql).iterate().next()).intValue();
鍏朵腑h(huán)ql="select count(*) from " + DAOVar.contactClass;
7.榪樻湁灝辨槸鎶?hbm涓殑hibernate-mapping-2.0.dtd鏇挎崲涓篽ibernate-mapping-3.0.dtd
Hibernate Mapping DTD 2.0鏇挎崲涓篐ibernate Mapping DTD 3.0
8.hibernate.cfg.xml涓?BR> Hibernate Mapping DTD 2.0鏇挎崲涓篐ibernate Mapping DTD 3.0
<property name="hibernate.dialect">org.hibernate.dialect.SQLServerDialect</property>
9.hibernate.properties涓被浼?BR>
10.cache-config.xml涓?BR> <provider className="net.sf.hibernate.cache.OSCacheProvider"/>鏇挎崲涓?BR> <provider className="org.hibernate.cache.OSCacheProvider"/>
11.classeshibernate.properties涓?BR> hibernate.cache.provider_class=org.hibernate.cache.EhCacheProvider
hibernate.dialect=org.hibernate.dialect.SQLServerDialect
12.鍦ㄨ嚜鍔ㄥ閮ㄦā鍧楅儴鍒嗘湁涓涓姛鑳芥槸鏍規(guī)嵁妯$増鑷姩鐢熸垚.hbm鏂囦歡鍦╨oad,緇撴灉鍑烘潵鐨?hbm涓湁闂:
鐢熸垚鐨?nbsp;<composite-id unsaved-value="any" mapped="false">鍏朵腑mapped="false" 鍑洪敊銆傛壘浜嗗崐澶╂墠鍙戠幇鍦ㄧ綉涓婄殑hibernate-mapping-3.0.dtd鏂囦歡鏈夋敮鎸乵apped="false"榪欎釜灞炴с傝屾湰鍦扮殑hebernate3.0.5涓殑hibernate-mapping-3.0.dtd鏂囦歡娌℃湁榪欎釜灞炴с傛檿錛宧ibernate涔熷お涓嶈礋璐d簡鍚с傝В鍐沖姙娉曟妸hibernate-mapping-3.0.dtd copy鍒癹boss\bin鐩綍涓嬬劧鍚庯紝鍦╰emplate鏂囦歡涓?lt;!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD//EN" "hibernate-mapping-3.0.dtd">錛岀劧鍚庝粬浼氬湪jboss\bin鐩綍涓嬭鍙栬鏂囦歡銆?BR>
13.閲嶆柊嫻嬭瘯,榪樻槸鍜i摏錛屽彂鐜板瓙綾昏鐖剁被鏁版嵁鏃舵姏鍑哄紓甯革細
"org.hibernate.LazyInitializationException: could not initialize proxy"
寤惰繜鎶撳彇鍑虹殑閿欙紝hb3瀵筸any-to-one鐨勯粯璁ゅ鐞嗘槸lazy = "proxy"錛屾病鏈夋悶鎳傚埌搴曟庝箞鍥炰簨錛屾妸鎵鏈塵any-to-one,one-to-one閮藉姞涓妉azy="false"錛屽啀嫻嬭瘯緇堜簬澶у姛鍛婃垚銆?BR>
鏂囩珷鍘熶綔鑰匓log錛?/FONT>http://blog.csdn.net/chinaewolf/
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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岄渶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>
姒傚康妯″瀷
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鍨嬩腑瀛樺湪鐨勯棶棰橈紝甯姪鍒嗘瀽浜哄憳鍙婃棭瀵規(guī)ā鍨嬭繘琛屼慨鏀廣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>
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勪緥瀛愶紝渚嬪涓鍙瘝楦℃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>
鍏崇郴鏁版嵁妯″瀷
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>
涓涓垨澶氫釜琛?BR> 琛ㄧ殑鎵鏈夌儲寮?BR> 瑙嗗浘
瑙﹀彂鍣?BR> 琛ㄤ笌琛ㄤ箣闂寸殑鍙傜収瀹屾暣鎬?BR>
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 DDL璇█鏉ュ垱寤烘暟鎹簱Schema銆係QL DDL 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 SQL DDL錛?BR>
create table CUSTOMERS {
ID int not null,
NAME varchar(20),
AGE int,
primary key (ID)
};
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敼銆備緥濡備互涓婼QL璇彞鍒涘緩浜嗕袱涓墿鐞哠chema錛?BR>
create schema SCHEMA_A;
create table SCHEMA_A.CUSTOMERS(ID int not null,鈥︹?;
create schema SCHEMA_B;
create table SCHEMA_B.CUSTOMERS(ID int not null,鈥︹?;
鍩熸ā鍨?/B>
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>
鍩熷璞?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
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>
鍩熷璞′箣闂寸殑鍏崇郴
鍦ㄥ煙妯″瀷涓紝綾諱箣闂村瓨鍦ㄥ洓縐嶅叧緋匯?BR>
1.鍏寵仈(Association)
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>
2.渚濊禆(Dependency)
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>
3.鑱氶泦(Aggregation)
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>
public class Person {
private Set hands = new HashSet();
鈥︹︹︹?BR> }
4.涓鑸寲(Generalization)
涓鑸寲鎸囩殑鏄被涔嬮棿鐨勭戶鎵垮叧緋匯?BR>
鍩熷璞$殑鎸佷箙鍖栨蹇?BR>
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樻棤娉曟案涔呭湴淇濆瓨鏁版嵁錛屽洜姝ゅ繀欏誨瀹炰綋鍩熷璞¤繘琛屾寔涔呭寲銆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>
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>
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>
鍙傝冧功綾嶏細瀛欏崼鐞?綺鵑欻ibernate Java瀵硅薄鎸佷箙鍖栨妧鏈瑙?/FONT>