濡傛灉杞澆錛岃鏍囨槑鍑哄錛岃阿璋?/font>
寤惰繜鍒濆鍖栭敊璇槸榪愮敤Hibernate寮鍙戦」鐩椂鏈甯歌鐨勯敊璇傚鏋滃涓涓被鎴栬呴泦鍚堥厤緗簡寤惰繜媯(gè)绱㈢瓥鐣ワ紝閭ｄ箞蹇呴』褰撲唬鐞嗙被瀹炰緥鎴栦唬鐞嗛泦鍚堝浜庢寔涔呭寲鐘舵侊紙鍗沖浜嶴ession鑼冨洿鍐咃級鏃訛紝鎵嶈兘鍒濆鍖栧畠銆傚鏋滃湪娓哥鐘舵佹椂鎵嶅垵濮嬪寲瀹冿紝灝變細(xì)浜х敓寤惰繜鍒濆鍖栭敊璇?/p>
涓嬮潰鎶奀ustomer.hbm.xml鏂囦歡鐨?lt;class>鍏冪礌鐨刲azy灞炴ц涓簍rue錛岃〃紺轟嬌鐢ㄥ歡榪熸绱㈢瓥鐣ワ細(xì)
<class name="mypack.Customer" table="CUSTOMERS" lazy="true">
褰撴墽琛孲ession鐨刲oad()鏂規(guī)硶鏃訛紝Hibernate涓嶄細(xì)绔嬪嵆鎵ц鏌ヨCUSTOMERS琛ㄧ殑select璇彞錛屼粎浠呰繑鍥濩ustomer綾葷殑浠ｇ悊綾葷殑瀹炰緥錛岃繖涓唬鐞嗙被鍏風(fēng)敱浠ヤ笅鐗瑰緛錛?/p>
錛?錛?鐢盚ibernate鍦ㄨ繍琛屾椂鍔ㄦ佺敓鎴愶紝瀹冩墿灞曚簡Customer綾伙紝鍥犳瀹冪戶鎵夸簡Customer綾葷殑鎵鏈夊睘鎬у拰鏂規(guī)硶錛屼絾瀹冪殑瀹炵幇瀵逛簬搴旂敤紼嬪簭鏄忔槑鐨勩?br />錛?錛?褰揌ibernate鍒涘緩Customer浠ｇ悊綾誨疄渚嬫椂錛屼粎浠呭垵濮嬪寲浜嗗畠鐨凮ID灞炴э紝鍏朵粬灞炴ч兘涓簄ull錛屽洜姝よ繖涓唬鐞嗙被瀹炰緥鍗犵敤鐨勫唴瀛樺緢灝戙?br />錛?錛?褰撳簲鐢ㄧ▼搴忕涓嬈¤闂瓹ustomer浠ｇ悊綾誨疄渚嬫椂錛堜緥濡傝皟鐢╟ustomer.getXXX()鎴朿ustomer.setXXX()鏂規(guī)硶錛夛紝 Hibernate浼?xì)鍒濆鍖栦唬鐞喚c誨疄渚嬶紝鍦ㄥ垵濮嬪寲榪囩▼涓墽琛宻elect璇彞錛岀湡姝ｄ粠鏁版嵁搴撲腑鍔犺澆Customer瀵硅薄鐨勬墍鏈夋暟鎹備絾鏈変釜渚嬪錛岄偅灝辨槸褰?搴旂敤紼嬪簭璁塊棶Customer浠ｇ悊綾誨疄渚嬬殑getId()鏂規(guī)硶鏃訛紝Hibernate涓嶄細(xì)鍒濆鍖栦唬鐞嗙被瀹炰緥錛屽洜涓哄湪鍒涘緩浠ｇ悊綾誨疄渚嬫椂OID灝卞瓨鍦ㄤ簡錛屼笉蹇?鍒版暟鎹簱涓幓鏌ヨ銆?br />
鎻?紺猴細(xì)Hibernate閲囩敤CGLIB宸ュ叿鏉ョ敓鎴愭寔涔呭寲綾葷殑浠ｇ悊綾匯侰GLIB鏄竴涓姛鑳藉己澶х殑Java瀛楄妭鐮佺敓鎴愬伐鍏鳳紝瀹冭兘澶熷湪紼嬪簭榪愯鏃跺姩鎬佺敓鎴愭墿灞?Java綾繪垨鑰呭疄鐜癑ava鎺ュ彛鐨勪唬鐞嗙被銆傚叧浜嶤GLIB鐨勬洿澶氱煡璇嗭紝璇峰弬鑰冿細(xì)http://cglib.sourceforge.net/銆?/em>
浠ヤ笅浠ｇ爜鍏堥氳繃Session鐨刲oad()鏂規(guī)硶鍔犺澆Customer瀵硅薄錛岀劧鍚庤闂畠鐨刵ame灞炴э細(xì)
tx = session.beginTransaction();
Customer customer=(Customer)session.load(Customer.class,new Long(1));
customer.getName();
tx.commit();
鍦?榪愯session.load()鏂規(guī)硶鏃禜ibernate涓嶆墽琛屼換浣晄elect璇彞錛屼粎浠呰繑鍥濩ustomer綾葷殑浠ｇ悊綾葷殑瀹炰緥錛屽畠鐨凮ID涓?錛岃繖 鏄敱load()鏂規(guī)硶鐨勭浜屼釜鍙傛暟鎸囧畾鐨勩傚綋搴旂敤紼嬪簭璋冪敤customer.getName()鏂規(guī)硶鏃訛紝Hibernate浼?xì)鍒濆鍖朇ustomer浠ｇ悊 綾誨疄渚嬶紝浠庢暟鎹簱涓姞杞紺ustomer瀵硅薄鐨勬暟鎹紝鎵ц浠ヤ笅select璇彞錛?/p>
select * from CUSTOMERS where ID=1;
select * from ORDERS where CUSTOMER_ID=1;
褰?lt;class>鍏冪礌鐨刲azy灞炴т負(fù)true錛屼細(xì)褰卞搷Session鐨刲oad()鏂規(guī)硶鐨勫悇縐嶈繍琛屾椂琛屼負(fù)錛屼笅闈婦渚嬭鏄庛?/p>
1錛庡鏋滃姞杞界殑Customer瀵硅薄鍦ㄦ暟鎹簱涓笉瀛樺湪錛孲ession鐨刲oad()鏂規(guī)硶涓嶄細(xì)鎶涘嚭寮傚父錛屽彧鏈夊綋榪愯customer.getName()鏂規(guī)硶鏃舵墠浼?xì)鎶涘囖Z互涓嬪紓甯革細(xì)
ERROR LazyInitializer:63 - Exception initializing proxy
net.sf.hibernate.ObjectNotFoundException: No row with the given identifier exists: 1, of class:
mypack.Customer
2錛庡鏋滃湪鏁翠釜Session鑼冨洿鍐咃紝搴旂敤紼嬪簭娌℃湁璁塊棶榪嘋ustomer瀵硅薄錛岄偅涔圕ustomer浠ｇ悊綾葷殑瀹炰緥涓鐩翠笉浼?xì)琚垵濮嬪寲锛孒ibernate涓嶄細(xì)鎵ц浠諱綍select璇彞銆備互涓嬩唬鐮佽瘯鍥懼湪鍏抽棴Session鍚庤闂瓹ustomer娓哥瀵硅薄錛?/p>
tx = session.beginTransaction();
Customer customer=(Customer)session.load(Customer.class,new Long(1));
tx.commit();
session.close();
customer.getName();
鐢變簬寮曠敤鍙橀噺customer寮曠敤鐨凜ustomer浠ｇ悊綾葷殑瀹炰緥鍦⊿ession鑼冨洿鍐呭緇堟病鏈夎鍒濆鍖栵紝鍥犳鍦ㄦ墽琛宑ustomer.getName()鏂規(guī)硶鏃訛紝Hibernate浼?xì)鎶涘囖Z互涓嬪紓甯革細(xì)
ERROR LazyInitializer:63 - Exception initializing proxy
net.sf.hibernate.HibernateException: Could not initialize proxy - the owning Session was closed
鐢辨鍙錛孋ustomer浠ｇ悊綾葷殑瀹炰緥鍙湁鍦ㄥ綋鍓峉ession鑼冨洿鍐呮墠鑳借鍒濆鍖栥?/p>
3錛巒et.sf.hibernate.Hibernate綾葷殑initialize()闈欐佹柟娉曠敤浜庡湪Session鑼冨洿鍐呮樉寮忓垵濮嬪寲浠ｇ悊綾誨疄渚嬶紝isInitialized()鏂規(guī)硶鐢ㄤ簬鍒ゆ柇浠ｇ悊綾誨疄渚嬫槸鍚﹀凡緇忚鍒濆鍖栥備緥濡傦細(xì)
tx = session.beginTransaction();
Customer customer=(Customer)session.load(Customer.class,new Long(1));
if(!Hibernate.isInitialized(customer))
Hibernate.initialize(customer);
tx.commit();
session.close();
customer.getName();
浠ヤ笂浠ｇ爜鍦⊿ession鑼冨洿鍐呴氳繃Hibernate綾葷殑initialize()鏂規(guī)硶鏄懼紡鍒濆鍖栦簡Customer浠ｇ悊綾誨疄渚嬶紝鍥犳褰揝ession鍏抽棴鍚庯紝鍙互姝ｅ父璁塊棶Customer娓哥瀵硅薄銆?/p>
4錛庡綋搴旂敤紼嬪簭璁塊棶浠ｇ悊綾誨疄渚嬬殑getId()鏂規(guī)硶鏃訛紝涓嶄細(xì)瑙﹀彂Hibernate鍒濆鍖栦唬鐞嗙被瀹炰緥鐨勮涓猴紝渚嬪錛?/p>
tx = session.beginTransaction();
Customer customer=(Customer)session.load(Customer.class,new Long(1));
customer.getId();
tx.commit();
session.close();
customer.getName();
褰?搴旂敤紼嬪簭璁塊棶customer.getId()鏂規(guī)硶鏃訛紝璇ユ柟娉曠洿鎺ヨ繑鍥濩ustomer浠ｇ悊綾誨疄渚嬬殑OID鍊鹼紝鏃犻渶鏌ヨ鏁版嵁搴撱傜敱浜庡紩鐢ㄥ彉閲?customer濮嬬粓寮曠敤鐨勬槸娌℃湁琚垵濮嬪寲鐨凜ustomer浠ｇ悊綾誨疄渚嬶紝鍥犳褰揝ession鍏抽棴鍚庡啀鎵цcustomer.getName()鏂規(guī)硶錛?Hibernate浼?xì)鎶涘囖Z互涓嬪紓甯革細(xì)
ERROR LazyInitializer:63 - Exception initializing proxynet.sf.hibernate.HibernateException: Could not initialize proxy - the owning Session was closed
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