絎?绔?騫跺彂闂鍙?qiáng)鎺у埗鎵媽D?/h1>
浠涔堟槸騫跺彂闂錛熷亣璁炬湁榪欎箞涓瀹朵功鍚э紝欏懼鍙互鍒伴偅閲屽枬鑼惰涔︺傞【瀹㈡嬁鐫閫夊ソ瑕佽鐨勫浘涔﹀埌鏌滃彴鐧昏錛岀劧鍚庢壘涓湴鏂瑰幓闃呰錛屼復(fù)璧版椂灝嗗浘涔﹀綊榪樺簵瀹躲傛湁涓澶╋紝涓涓【瀹㈢浉涓簡(jiǎn)涓鏈功鍚庢瑕佹嬁鍘葷?rùn)昏畮图屽彟涓涓【瀹㈢殑鎵嬩篃鎶撲綇浜?jiǎn)杩欎粎鏈夌殑涓鏈功錛屽茍鍙戦棶棰樺嚭鐜頒簡(jiǎn)銆備袱涓【瀹㈣璇誨悓涓鏈功錛屼簰涓嶇浉璁╋紝榪欒搴椾富浼ら忎簡(jiǎn)鑴戠瓔銆傝繖涓渚嬩粎浠呮槸浼楀騫跺彂闂涓殑涓涓井灝忛儴鍒嗭紝浣嗕粠涓垜浠彲浠ョ湅鍑哄茍鍙戦棶棰樹富瑕佸嚭鐜板湪澶氫釜鐢ㄦ埛瀵規(guī)湁闄愯祫婧愯繘琛岃闂殑鏃跺欙紝濡傛灉瑙ｅ喅涓嶅ソ浼?xì)鐩存帴濯?jiǎng)鍝嶇郴緇熺殑鏈夋晥銆佹甯歌繍琛屻傛暟鎹簱鏄竴涓叡浜殑璧勬簮錛屽茍鍙戦棶棰樼殑鍑虹幇鏄繀涓嶅彲鍏嶇殑錛屽浣曡瘑鍒茍鍙戠被鍨嬪茍鍔犱互鎺у埗鏄繖涓绔犻噸鐐硅璁茶堪鐨勫唴瀹廣?/p>
鏈珷灝嗗垎鎴愪袱澶ч儴鍒嗭紝涓閮ㄥ垎涓昏璁睼isual FoxPro涓茍鍙戞帶鍒舵満鍒躲俈FP涓茍鍙戞帶鍒剁浉瀵圭畝鍗曪紝鏁版嵁鍔犻攣鐨勫艦寮忔瘮杈冨崟涓錛岄潪甯擱傚悎浣滀負(fù)鍒濇浜?jiǎn)瑙ｒq跺彂闂鐨勫垏鍏ョ偣銆傜浜岄儴鍒嗕互SQL Server 2000銆丄DO.NET浠ュ強(qiáng)C#涓轟富瑕佸伐鍏鳳紝娣卞叆浜?jiǎn)瑙ｒq跺彂涓鑷存ч棶棰樸佸皝閿佸崗璁佷簨鍔￠殧紱葷瓑鍐呭錛岄毦搴︾浉瀵硅緝娣便傝薄涓浜涙洿涓烘繁鍏ョ殑騫跺彂鎺у埗鎵嬫錛屼緥濡傚綺掑害灝侀攣鍜屾剰璞￠攣絳夊唴瀹瑰湪鏈珷涓皢涓嶅仛娣卞叆璁ㄨ錛屾劅鍏磋叮鍙互鍙傝冪浉鍏充功綾嶃?/p>
聽
[瀹炲湪涓嶅ソ鎰忔滳OPY鍒漢鐨勬垚鏋滐紝涓嶈繃榪欑瘒鏂囩珷鍑哄鐨勭簿褰╋紝灝嗗茍鍙戞搷浣滅殑鏉ラ緳鍘昏剦璇寸殑娓呮竻妤氭錛屼篃鏄垜姝ｈ鎵劇殑錛屾瘮JAVAEYE涓婇潰鎵璋撶殑涓撳鍙毞鐫浠涔?鎮(zhèn)茶閿?銆?涔愯閿?鑰屼笉瑙ｆ槸鍘熷洜瑕佸己鐨勫錛佸煎緱鏀惰棌]
]]>
java浠ｇ爜:  |
|
1 Session session = ...; 2 Transaction tx = ...; 3 4 Parent parent = (Parent) session.load(Parent.class, id); 5 6 Child child = new Child(); 7 child.setParent(parent); 8 child.setName("sun"); 9 10 parent.addChild(child); 11 s.update(parent); 12 13 s.flush(); 14 tx.commit(); 15 s.close(); |
鍦ㄤ笂渚嬩腑錛岀▼搴忓茍娌℃湁鏄懼紡鐨剆ession.save(child); 閭ｄ箞Hibernate闇瑕佺煡閬揷hild絀剁珶鏄竴涓復(fù)鏃跺璞★紝榪樻槸宸茬粡鍦ㄦ暟鎹簱涓湁鐨勬寔涔呭璞°傚鏋渃hild鏄竴涓柊鍒涘緩鐨勪復(fù)鏃跺璞?鏈緥涓氨鏄繖縐嶆儏鍐?錛岄偅涔圚ibernate搴旇鑷姩浜х敓session.save(child)榪欐牱鐨勬搷浣滐紝濡傛灉child鏄凡緇忓湪鏁版嵁搴撲腑鏈夌殑鎸佷箙瀵硅薄錛岄偅涔圚ibernate搴旇鑷姩浜х敓session.update(child)榪欐牱鐨勬搷浣溿?
鍥犳鎴戜滑闇瑕佹殫紺轟竴涓婬ibernate錛岀┒绔焎hild瀵硅薄搴旇瀵瑰畠鑷姩save榪樻槸update銆傚湪涓婁緥涓紝鏄劇劧鎴戜滑搴旇鏆楃ずHibernate瀵筩hild鑷姩save錛岃屼笉鏄嚜鍔╱pdate銆傞偅涔圚ibernate濡備綍鍒ゆ柇絀剁珶瀵筩hild鏄痵ave榪樻槸update鍛紵瀹冧細(xì)鍙栦竴涓媍hild鐨勪富閿睘鎬?child.getId() 錛岃繖閲屽亣璁緄d鏄?java.lang.Integer綾誨瀷鐨勩傚鏋滃彇鍒扮殑Id鍊煎拰hbm鏄犲皠鏂囦歡涓寚瀹氱殑unsave-value鐩哥瓑錛岄偅涔圚ibernate璁や負(fù)child鏄柊鐨勫唴瀛樹復(fù)鏃跺璞★紝鍙戦乻ave錛屽鏋滀笉鐩哥瓑錛岄偅涔圚ibernate璁や負(fù)child鏄凡緇忔寔涔呰繃鐨勫璞★紝鍙戦乽pdate銆?
unsaved-value="null" (榛樿鎯呭喌錛岄傜敤浜庡ぇ澶氭暟瀵硅薄綾誨瀷涓婚敭 Integer/Long/String/...)
褰揌ibernate鍙栦竴涓媍hild鐨処d錛屽彇鍑烘潵鐨勬槸null(鍦ㄤ笂渚嬩腑鑲畾鍙栧嚭鏉ョ殑鏄痭ull)錛屽拰unsaved-value璁懼畾鍊肩浉絳夛紝鍙戦乻ave(child)
褰揌ibernate鍙栦竴涓媍hild鐨刬d錛屽彇鍑烘潵鐨勪笉鏄痭ull錛岄偅涔堝拰unsaved-value璁懼畾鍊間笉鐩哥瓑錛屽彂閫乽pdate(child)
渚嬪涓嬮潰鐨勬儏鍐碉細(xì)
| java浠ｇ爜: |
|
1 Session session = ...; 2 Transaction tx = ...; 3 4 Parent parent = (Parent) session.load(Parent.class, id); 5 Child child = (Child) session.load(Child.class, childId); 6 7 child.setParent(parent); 8 child.setName("sun"); 9 10 parent.addChild(child); 11 s.update(parent); 12 13 s.flush(); 14 tx.commit(); 15 s.close(); |
child宸茬粡鍦ㄦ暟鎹簱涓湁浜?jiǎn)锛屾槸涓涓寔涔呭寲鐨勫璞★紝涓嶆槸鏂板垱寤虹殑錛屽洜姝ゆ垜浠笇鏈汬ibernate鍙戦乽pdate(child)錛屽湪璇ヤ緥涓紝Hibernate鍙栦竴涓媍hild.getId()錛屽拰unsave-value鎸囧畾鐨刵ull姣斿涓涓嬶紝鍙戠幇涓嶇浉絳夛紝閭ｄ箞鍙戦乽pdate(child)銆?
BTW: parent瀵硅薄涓嶉渶瑕佹搷蹇?jī)锛屽洜湄?fù)紼嬪簭鏄懼紡鐨勫parent鏈塴oad鎿嶄綔鍜寀pdate鐨勬搷浣滐紝涓嶉渶瑕丠ibernate鑷繁鏉ュ垽鏂┒绔熸槸save榪樻槸update浜?jiǎn)銆傛垜浠娉ㄦ剰鐨勫彧鏄痗hild瀵硅薄鐨勬搷浣溿傚彟澶?SPAN style="COLOR: #ffa34f">unsaved-value鏄畾涔夊湪Child綾葷殑涓婚敭灞炴т腑鐨勩?
| java浠ｇ爜: |
|
1 <class name="Child" table="child"> 2 <id column="id" name="id" type="integer" unsaved-value="null"> 3 <generator class="identity"/> 4 </id> 5 ... 6 </class> |
濡傛灉涓婚敭灞炴т笉鏄璞″瀷錛岃屾槸鍩烘湰綾誨瀷錛屽int/long/double/...錛岄偅涔堜綘闇瑕佹寚瀹氫竴涓暟鍊煎瀷鐨?SPAN style="COLOR: #ffa34f">unsaved-value錛屼緥濡傦細(xì)
| java浠ｇ爜: |
|
1 unsaved-null="0" |
鍦ㄦ鎻愰啋澶у錛屽緢澶氫漢浠ヤ負(fù)瀵逛富閿睘鎬у畾涔変負(fù)int/long錛屾瘮瀹氫箟涓篒nteger/Long榪愯鏁堢巼鏉ュ緱楂橈紝璁や負(fù)鍩烘湰綾誨瀷涓嶉渶瑕佽繘琛屽璞＄殑灝佽鍜岃В鏋勬搷浣滐紝鍥犳鍠滄鎶婁富閿畾涔変負(fù)int/long鐨勩備絾瀹為檯涓婏紝Hibernate鍐呴儴鎬繪槸鎶婁富閿漿鎹負(fù)瀵硅薄鍨嬭繘琛屾搷浣滅殑錛屽氨綆椾綘瀹氫箟涓篿nt/long鍨嬬殑錛孒ibernate鍐呴儴涔熻榪涜涓嬈″璞℃瀯閫犳搷浣滐紝榪斿洖緇欎綘鐨勬椂鍊欙紝榪樿榪涜瑙ｆ瀯鎿嶄綔錛屾晥鐜囧彲鑳藉弽鑰屼綆涔熻涓嶅畾銆傚洜姝ゅぇ瀹朵竴瀹氳鎵漿涓涓鐐癸紝鍦℉ibernate涓紝涓婚敭灞炴у畾涔変負(fù)鍩烘湰綾誨瀷錛屽茍涓嶈兘澶熸瘮瀹氫箟涓哄璞″瀷鏁堢巼鏉ョ殑楂橈紝鑰屼笖涔熷浜?jiǎn)寰堝楹荤儲(chǔ)锛屽洜姝ゅ圾櫘ぇ瀹朵娇鐢ㄥ璞″瀷鐨処nteger/Long瀹氫箟涓婚敭銆?
unsaved-value="none"鍜?
unsaved-value="any"
涓諱富瑕佺敤鍦ㄤ富閿睘鎬т笉鏄氳繃Hibernate鐢熸垚錛岃屾槸紼嬪簭鑷繁setId()鐨勬椂鍊欍?
鍦ㄨ繖閲屽璇翠竴鍙ワ紝寮虹儓寤鴻浣跨敤Hibernate鐨刬d generator錛屾垨鑰呬綘鍙互鑷繁鎵╁睍Hibernate鐨刬d generator錛岀壒鍒敞鎰忎笉瑕佷嬌鐢ㄦ湁瀹為檯鍚箟鐨勫瓧孌靛綋鍋氫富閿潵鐢紒渚嬪鐢ㄦ埛綾籙ser錛屽緢澶氫漢鍠滄鐢ㄧ敤鎴風(fēng)櫥闄嗗悕縐板仛涓轟富閿紝榪欐槸涓涓緢涓嶅ソ鐨勪範(fàn)鎯紝褰撶敤鎴風(fēng)被鍜屽叾浠栧疄浣撶被鏈夊叧鑱斿叧緋葷殑鏃跺欙紝涓囦竴浣犻渶瑕佷慨鏀圭敤鎴風(fēng)櫥闄嗗悕縐幫紝涓鏀瑰氨闇瑕佹敼濂藉嚑寮犺〃涓殑鏁版嵁銆傚伓鍚堟уお楂橈紝鑰屽鏋滀綘浣跨敤鏃犱笟鍔℃剰涔夌殑id generator錛岄偅涔堜慨鏀圭敤鎴峰悕縐幫紝灝卞彧淇敼user琛ㄥ氨琛屼簡(jiǎn)銆?
鐢辮繖涓棶棰樺紩鐢沖嚭鏉ワ紝濡傛灉浣犱弗鏍兼寜鐓ц繖涓師鍒欐潵璁捐鏁版嵁搴擄紝閭ｄ箞浣犲熀鏈笂鏄敤涓嶅埌鎵嬪伐鏉etId()鐨勶紝浣犵敤Hibernate鐨刬d generator灝監(jiān)K浜?jiǎn)銆傚洜姝や綘涔熶笉闇瑕佷簡(jiǎn)瑙ｅ綋
unsaved-value="none"鍜?
unsaved-value="any"
絀剁珶鏈変粈涔堝惈涔変簡(jiǎn)銆傚鏋滀綘闈炶鐢╝ssigned涓嶅彲錛岄偅涔堢戶緇В閲婁竴涓嬶細(xì)
unsaved-value="none" 鐨勬椂鍊欙紝鐢變簬涓嶈涓婚敭灞炴т負(fù)浠諱綍鍊鹼紝閮戒笉鍙兘涓簄one錛屽洜姝ibernate鎬繪槸瀵筩hild瀵硅薄鍙戦乽pdate(child)
unsaved-value="any" 鐨勬椂鍊欙紝鐢變簬涓嶈涓婚敭灞炴т負(fù)浠諱綍鍊鹼紝閮借偗瀹氫負(fù)any錛屽洜姝ibernate鎬繪槸瀵筩hild瀵硅薄鍙戦乻ave(child)
澶у鏁版儏鍐典笅錛屼綘鍙互閬垮厤浣跨敤assigned錛屽彧鏈夊綋浣犱嬌鐢ㄥ鍚堜富閿殑鏃跺欎笉寰椾笉鎵嬪伐setId()錛岃繖鏃跺欓渶瑕佷綘鑷繁鑰冭檻絀剁珶鎬庝箞璁劇疆unsaved-value浜?jiǎn)锛屾犚?guī)嵁浣犺嚜宸辯殑闇瑕佹潵瀹氥?
BTW: Gavin King寮虹儓涓嶅緩璁嬌鐢╟omposite-id錛屽己鐑堝緩璁嬌鐢║serType銆?
鍥犳錛屽鏋滀綘鍦ㄧ郴緇熻璁＄殑鏃跺欙紝閬靛驚濡備笅鍘熷垯錛?
1銆佷嬌鐢℉ibernate鐨刬d generator鏉ョ敓鎴愭棤涓氬姟鎰忎箟鐨勪富閿紝涓嶄嬌鐢ㄦ湁涓氬姟鍚箟鐨勫瓧孌靛仛涓婚敭錛屼笉浣跨敤assigned銆?
2銆佷嬌鐢ㄥ璞＄被鍨?String/Integer/Long/...)鏉ュ仛涓婚敭錛岃屼笉浣跨敤鍩虹綾誨瀷(int/long/...)鍋氫富閿?
3銆佷笉浣跨敤composite-id鏉ュ鐞嗗鍚堜富閿殑鎯呭喌錛岃屼嬌鐢║serType鏉ュ鐞嗚縐嶆儏鍐點(diǎn)?/SPAN>
閭ｄ箞浣犳案榪滅敤鐨勬槸unsaved-value="null" 錛屼笉鍙兘鐢ㄥ埌any/none/..浜?jiǎn)銆?/SPAN>
]]>
鍦℉ibernate涓紝鏈鏍稿績(jī)鐨勬蹇靛氨鏄PO鐨勭姸鎬佺鐞嗐備竴涓狿O鏈変笁縐嶇姸鎬侊細(xì)
1銆佹湭琚寔涔呭寲鐨刅O
姝ゆ椂灝辨槸涓涓唴瀛樺璞O錛岀敱JVM綆＄悊鐢熷懡鍛ㄦ湡
2銆佸凡琚寔涔呭寲鐨凱O錛屽茍涓斿湪Session鐢熷懡鍛ㄦ湡鍐?
姝ゆ椂鏄犲皠鏁版嵁搴撴暟鎹紝鐢辨暟鎹簱綆＄悊鐢熷懡鍛ㄦ湡
3銆佹浘琚寔涔呭寲榪囷紝浣嗙幇鍦ㄥ拰Session宸茬粡detached浜?jiǎn)锛屼互VO鐨勮韓浠藉湪榪愯
榪欑鍜孲ession宸茬粡detached鐨凱O榪樿兘澶熻繘鍏ュ彟涓涓猄ession錛岀戶緇繘琛孭O鐘舵佺鐞嗭紝姝ゆ椂瀹冨氨鎴愪負(fù)PO鐨勭浜岀鐘舵佷簡(jiǎn)銆?SPAN style="COLOR: red">榪欑PO瀹為檯涓婃槸璺ㄤ簡(jiǎn)Session榪涜浜?jiǎn)鐘舵佺淮鎶ょ殑銆?/SPAN>
鍦ㄤ紶緇熺殑JDO1.x涓紝PO鍙湁鍓嶉潰涓ょ鐘舵侊紝涓涓狿O涓鏃﹁劚紱籔M錛屽氨涓уけ浜?jiǎn)鐘舵佷簡(jiǎn)錛屼笉鍐嶅拰鏁版嵁搴撴暟鎹叧鑱旓紝鎴愪負(fù)涓涓函綺圭殑鍐呭瓨VO錛屽畠鍗充嬌榪涘叆涓涓柊鐨凱M錛屼篃涓嶈兘鎭㈠瀹冪殑鐘舵佷簡(jiǎn)銆?
Hibernate寮虹殑鍦版柟灝卞湪浜庯紝涓涓狿O鑴辯Session涔嬪悗錛岃繕鑳戒繚鎸佺姸鎬侊紝鍐嶈繘鍏ヤ竴涓柊鐨凷ession涔嬪悗錛屽氨鎭㈠鐘舵佺鐞嗙殑鑳藉姏錛屼絾姝ゆ椂鐘舵佺鐞嗛渶瑕佷嬌鐢╯ession.update鎴栬卻ession.saveOrUpdate錛岃繖灝辨槸Hibernate Reference涓彁鍒扮殑鈥渞equires a slightly different programming model 鈥?
鐜板湪姝ｅ紡榪涘叆鏈瘽棰橈細(xì)
綆鍗曠殑鏉ヨ錛寀pdate鍜?SPAN style="COLOR: #ffa34f">saveOrUpdate鏄敤鏉ュ璺⊿ession鐨凱O榪涜鐘舵佺鐞嗙殑銆?/SPAN>
鍋囪浣犵殑PO涓嶉渶瑕佽法Session鐨勮瘽錛岄偅涔堝氨涓嶉渶瑕佺敤鍒幫紝渚嬪浣犳墦寮涓涓猄ession錛屽PO榪涜鎿嶄綔錛岀劧鍚庡叧闂紝涔嬪悗榪欎釜PO浣犱篃涓嶄細(xì)鍐嶇敤鍒頒簡(jiǎn)錛岄偅涔堝氨涓嶉渶瑕佺敤update銆?
鍥犳錛屾垜浠潵鐪嬬湅涓婁緥錛?
| java浠ｇ爜: |
|
1 Foo foo=sess.load(Foo.class,id); 2 foo.setXXX(xxx); 3 sess.flush(); 4 sess.commit(); |
PO瀵硅薄foo鐨勬搷浣滈兘鍦ㄤ竴涓猄ession鐢熷懡鍛ㄦ湡鍐呭畬鎴愶紝鍥犳涓嶉渶瑕佹樉寮忕殑榪涜sess.update(foo)榪欐牱鐨勬搷浣溿侶ibernate浼?xì)鑷姩鐩憢箣鍒癴oo瀵硅薄宸茬粡琚慨鏀硅繃錛屽洜姝ゅ氨鍚戞暟鎹簱鍙戦佷竴涓猽pdate鐨剆ql銆傚綋鐒跺鏋滀綘闈炶鍔犱笂sess.update(foo)涔熶笉浼?xì)閿欏Q屽彧涓嶈繃榪欐牱鍋氭病鏈変換浣曞繀瑕併?
鑰岃法Session鐨勬剰鎬濆氨鏄榪欎釜PO瀵硅薄鍦⊿ession鍏抽棴涔嬪悗錛屼綘榪樻妸瀹冨綋鍋氫竴涓猇O鏉ョ敤錛屽悗鏉ヤ綘鍦⊿ession澶栭潰鍙堜慨鏀逛簡(jiǎn)瀹冪殑灞炴э紝鐒跺悗浣犲張鎯蟲墦寮涓涓猄ession錛屾妸VO鐨勫睘鎬т慨鏀逛繚瀛樺埌鏁版嵁搴撻噷闈紝閭ｄ箞浣犲氨闇瑕佺敤update浜?jiǎn)銆?
| java浠ｇ爜: |
|
1 // in the first session 2 Cat cat = (Cat) firstSession.load(Cat.class, catId); 3 Cat potentialMate = new Cat(); 4 firstSession.save(potentialMate); 5 6 // in a higher tier of the application 7 cat.setMate(potentialMate); 8 9 // later, in a new session 10 secondSession.update(cat); // update cat 11 secondSession.update(mate); // update mate 12 |
cat鍜宮ate瀵硅薄鏄湪絎竴涓猻ession涓彇寰楃殑錛屽湪絎竴涓猻ession鍏抽棴涔嬪悗錛屼粬浠氨鎴愪簡(jiǎn)PO鐨勭涓夌鐘舵侊紝鍜孲ession宸茬粡detached鐨凱O錛屾鏃朵粬浠殑鐘舵佷俊鎭粛鐒惰淇濈暀涓嬫潵浜?jiǎn)銆傚綋浠栦滑榪涘叆絎簩涓猻ession涔嬪悗錛岀珛鍒誨氨鍙互榪涜鐘舵佺殑鏇存柊銆備絾鏄敱浜庡cat鐨勪慨鏀規(guī)搷浣滐細(xì)cat.setMate(potentialMate); 鏄湪Session澶栭潰榪涜鐨勶紝Hibernate涓嶅彲鑳界煡閬揷at瀵硅薄宸茬粡琚敼榪囦簡(jiǎn)錛岀浜屼釜Session騫朵笉鐭ラ亾榪欑淇敼錛屽洜姝や竴瀹氳鏄懼紡鐨勮皟鐢╯econdSession.update(cat); 閫氱煡Hibernate錛宑at瀵硅薄宸茬粡淇敼浜?jiǎn)锛屼綘蹇厵逭d彂閫乽pdate鐨剆ql浜?jiǎn)銆?
鎵浠pdate鐨勪綔鐢ㄥ氨鍦ㄤ簬姝わ紝瀹冨彧浼?xì)琚敤浜庡綋涓涓狿O瀵硅薄璺⊿ession榪涜鐘舵佸悓姝ョ殑鏃跺欐墠闇瑕佸啓銆傝屼竴涓狿O瀵硅薄褰撳畠涓嶉渶瑕佽法Session榪涜鐘舵佺鐞嗙殑鏃跺欙紝鏄笉闇瑕佸啓update鐨勩?
鍐嶈皥璋?SPAN style="COLOR: #ffa34f">saveOrUpdate鐨勭敤鍦猴細(xì)
saveOrUpdate鍜寀pdate鐨勫尯鍒氨鍦ㄤ簬鍦ㄨ法Session鐨凱O鐘舵佺鐞嗕腑錛孒ibernate瀵筆O閲囧彇浣曠絳栫暐銆?
渚嬪褰撲綘鍐欎竴涓狣AOImpl鐨勬椂鍊欙紝璁ヽat瀵硅薄澧炲姞涓涓猰ate錛屽涓嬪畾涔夛細(xì)
| java浠ｇ爜: |
 1 public void addMate(Cat cat, Mate mate) {
...}
2 Session session = ...; 3 Transacton tx = ...; 4 session.update(cat); 5 cat.addMate(mate); 6 tx.commit(); 7 session.close(); 8 }; |
鏄劇劧浣犳槸闇瑕佹妸Hibernate鐨勬搷浣滃皝瑁呭湪DAO閲岄潰鐨勶紝璁╀笟鍔″眰鐨勭▼搴忓憳鍜學(xué)eb灞傜殑紼嬪簭鍛樹笉闇瑕佷簡(jiǎn)瑙ibernate錛岀洿鎺ュDAO榪涜璋冪敤銆?
姝ゆ椂闂灝辨潵浜?jiǎn)锛?xì)涓婇潰鐨勪唬鐮佽繍琛屾紜湁涓涓繀瑕佺殑鍓嶆彁錛岄偅灝辨槸鏂規(guī)硶璋冪敤鍙傛暟cat瀵硅薄蹇呴』鏄竴涓凡緇忚鎸佷箙鍖栬繃鐨凱O錛屼篃灝辨槸鏉ヨ錛屽畠搴旇棣栧厛浠庢暟鎹簱鏌ヨ鍑烘潵錛岀劧鍚庢墠鑳借繖鏍風(fēng)敤銆備絾鏄笟鍔″眰鐨勭▼搴忓憳鏄劇劧涓嶇煡閬撹繖縐嶅唴閮ㄧ殑鐜勫錛屽鏋滀粬鐨勪笟鍔℃槸鐜板湪澧炲姞涓涓猚at錛岀劧鍚庡啀澧炲姞瀹冪殑mate錛屼粬鏄劇劧浼?xì)杩欐牤偘冪敤锛宯ew涓涓猚at瀵硅薄鍑烘潵錛岀劧鍚庡氨addMate錛?
| java浠ｇ爜: |
|
1 Cat cat = new Cat(); 2 cat.setXXX(); 3 daoimpl.addMate(cat,mate); |
浣嗘槸璇鋒敞鎰忕湅錛岃繖涓猚at瀵硅薄鍙槸涓涓猇O錛屽畠娌℃湁琚寔涔呭寲榪囷紝瀹冭繕涓嶆槸PO錛屽畠娌℃湁璧勬牸璋冪敤addMate鏂規(guī)硶錛屽洜姝よ皟鐢╝ddMate鏂規(guī)硶涓嶄細(xì)鐪熸寰鏁版嵁搴撻噷闈㈠彂閫乽pdate鐨剆ql錛岃繖涓猚at瀵硅薄蹇呴』鍏堣save鍒版暟鎹簱錛屽湪鐪熸鎴愪負(fù)涓涓狿O涔嬪悗錛屾墠鍏峰addMate鐨勮祫鏍箋?
浣犲繀欏昏繖鏍鋒潵鎿嶄綔錛?
| java浠ｇ爜: |
|
1 Cat cat = new Cat(); 2 cat.setXXX(); 3 daoimpl.addCat(cat); 4 daoimpl.addMate(cat, mate); |
鍏堟寔涔呭寲cat錛岀劧鍚庢墠鑳藉cat榪涜鍏朵粬鐨勬寔涔呭寲鎿嶄綔銆傚洜姝よ姹備笟鍔″眰鐨勭▼搴忓憳蹇呴』娓呮cat瀵硅薄澶勪簬浣曠鐘舵侊紝鍒板簳鏄涓縐嶏紝榪樻槸絎笁縐嶃傚鏋滄槸絎竴縐嶏紝灝辮鍏坰ave錛屽啀addMate錛涘鏋滄槸絎笁縐嶏紝灝辯洿鎺ddMate銆?
浣嗘槸鏈鑷村懡鐨勬槸錛屽鏋滄暣涓蔣浠跺垎灞傚緢澶氾紝涓氬姟灞傜殑紼嬪簭鍛樹粬鎷垮埌榪欎釜cat瀵硅薄涔熷彲鑳芥槸涓婂眰Web搴旂敤灞備紶閫掕繃鏉ョ殑cat錛屼粬鑷繁涔熶笉鐭ラ亾榪欎釜cat絀剁珶鏄疺O錛屾病鏈夎鎸佷箙鍖栬繃錛岃繕鏄凡緇忚鎸佷箙鍖栬繃錛岄偅涔堜粬鏍規(guī)湰灝辨病鏈夊姙娉曞啓紼嬪簭浜?jiǎn)銆?
鎵浠ヨ繖鏍風(fēng)殑DAOImpl鏄劇劧鏄湁闂鐨勶紝瀹冧細(xì)瀵逛笟鍔″眰鐨勭▼搴忓憳閫犳垚寰堝緙栫▼涓婄殑闄烽槺錛屼笟鍔″眰鐨勭▼搴忓憳蹇呴』娣卞埢鐨勪簡(jiǎn)瑙ｄ粬璋冪敤鐨勬瘡涓狣AO瀵筆O瀵硅薄榪涜浜?jiǎn)浣暱U嶇姸鎬佺鐞嗭紝蹇呴』娣卞埢鐨勪簡(jiǎn)瑙ｄ粬鐨凱O瀵硅薄鍦ㄤ換浣曟椂鍊欏浜庝粈涔堢‘鍒囩殑鐘舵侊紝鎵嶈兘淇濊瘉緙栫▼鐨勬紜э紝鏄劇劧榪欐槸鍋氫笉鍒扮殑錛屼絾鏄湁浜?SPAN style="COLOR: #ffa34f">saveOrUpdate錛岃繖浜涢棶棰樺氨榪庡垉鑰岃В浜?jiǎn)銆?
鐜板湪浣犻渶瑕佷慨鏀筧ddMate鏂規(guī)硶錛?
| java浠ｇ爜: |
|
1 public void addMate(Cat cat, Mate mate) {
...}
2 Session session = ...; 3 Transacton tx = ...; 4 session.saveOrUpdate(cat); 5 cat.addMate(mate); 6 tx.commit(); 7 session.close(); 8 }; |
濡備笂錛屽鏋滀笟鍔″眰鐨勭▼搴忓憳浼犺繘鏉ョ殑鏄竴涓凡緇忔寔涔呭寲榪囩殑PO瀵硅薄錛岄偅涔圚ibernate浼?xì)鏇存柊cat瀵硅薄(鍋囪涓氬姟灞傜殑紼嬪簭鍛樺湪Session澶栭潰淇敼榪嘽at鐨勫睘鎬?錛屽鏋滀紶榪涙潵鐨勬槸涓涓柊new鍑烘潵鐨勫璞★紝閭ｄ箞鍚戞暟鎹簱save榪欎釜PO瀵硅薄銆?
BTW: Hibernate姝ゆ椂絀剁珶閲囧彇鏇存柊cat瀵硅薄錛岃繕鏄痵ave cat瀵硅薄錛屽彇鍐充簬unsave-value鐨勮瀹氥?
榪欐牱錛屼笟鍔″眰鐨勭▼搴忓憳灝變笉蹇呭啀鎿嶅績(jī)PO鐨勭姸鎬侀棶棰樹簡(jiǎn)錛屽浜庝粬浠潵璇達(dá)紝涓嶇cat鏄痭ew鍑烘潵鐨勫璞★紝鍙槸涓涓猇O涔熷ソ錛涜繕鏄粠鏁版嵁搴撴煡璇㈠嚭鏉ョ殑鐨凱O瀵硅薄涔熷ソ錛屽叏閮ㄩ兘鏄洿鎺ddMate灝監(jiān)K浜?jiǎn)锛?xì)
]]>
StrutsFileUpload
File Upload - Simple Example
HTML
This isn't specific to Struts, but gives a simple example of the HTML required to upload a single file.
Two things are needed in the html page. Firstly, the form needs to specify an enctype of multipart/form-data and secondly an form control of type file.
JSP
The above HTML can be generated using the Struts tags in the following way
<html:form action="/uploadMyFile.do" enctype="multipart/form-data">
Select File: <html:file property="myFile">
<html:submit value="Upload File"/>
</html:form>
ActionForm
The ActionForm needs a property of type FormFile.
Regular ActionForms
import org.apache.struts.upload.FormFile;
public class MyActionForm extends ActionForm {
private FormFile myFile;
public void setMyFile(FormFile myFile) {
this.myFile = myfile;
}
public FormFile getMyFile() {
return myFile;
}
}
Dyna ActionForms
In the struts-config.xml
<form-bean name="myForm" type="org.apache.struts.action.DynaActionForm">
<form-property name="myFile" type="org.apache.struts.upload.FormFile"/>
</form-bean>
Whats Needed in the Action
Nothing special really, just retrieve the FormFile from the ActionForm, as you would any other property, and process it as you like. You can get the file name, size and file contents from the FormFile.
public ActionForward execute(ActionMapping mapping,
ActionForm form,
HttpServletRequest request,
HttpServletResponse response) throws Exception {
MyActionForm myForm = (MyActionForm)form;
// Process the FormFile
FormFile myFile = myForm.getMyFile();
String contentType = myFile.getContentType();
String fileName = myFile.getFileName();
int fileSize = myFile.getFileSize();
byte[] fileData = myFile.getFileData();
...
}
File Upload Configuration
The following parameters can be set in the <controller> element of the struts-config.xml to configure file upload:
bufferSize - The size (in bytes) of the input buffer used when processing file uploads. Default is 4096.
maxFileSize - The maximum size (in bytes) of a file to be accepted as a file upload. Can be expressed as a number followed by a "K", "M", or "G", which are interpreted to mean kilobytes, megabytes, or gigabytes, respectively. Default is 250M.
multipartClass - The fully qualified Java class name of the multipart request handler class to be used with this module. Defaults is org.apache.struts.upload.CommonsMultipartRequestHandler.
tempDir - Temporary working directory to use when processing file uploads.
Above taken from the Configuration section in the User Guide.
Plugging in an Alternative File Upload Mechanism
By default Struts uses Commons File Upload.
Alternative implementations can be plugged as long as they implement the org.apache.struts.upload.MultipartRequestHandler interface and Struts configured to use that implementation by specifying it in the multipartClass parameter in the <controller> element of the struts-config.xml
Fair Warning: The MultipartRequestHandler interface is almost certain to change in a Struts 1.3 or higher release.
]]>