宸ョ▼甯冪講鐨勬椂鍊欐病鏈夊姞鍏?/span>hibernate3鐨?/span>jar鍖咃紝榪欎釜jar涓嶆槸榛樿鍔犲叆鐨勶紝瑕佸湪myeclipse -> add hibernate capabilities... ->閫夋嫨copy checked libraries to project folder and add to build-path鍚﹀垯宸ョ▼甯冪講鐨勬椂鍊欐棤璁哄浣曟槸涓嶄細鏈?/span>hibernate鐨勫寘鐨勩?/span>
2. org.hibernate.id.IdentifierGenerationException
褰撳嚭鐜?/span>org.hibernate.id.IdentifierGenerationException: ids for this class must be manually assigned before calling save():寮傚父鏃訛紝涓鑸槸鍥犱負<id>鍏冪礌閰嶇疆涓嶆紜紝<id>鍏冪礌緙哄皯鍏跺瓙鍏冪礌<generator></generator>鐨勯厤緗紩璧楓?/span>
瑙ｅ喅鏂規錛?/span><id>鍏冪礌鏄犲皠浜嗙浉搴旀暟鎹簱琛ㄧ殑涓婚敭瀛楁錛屽鍏跺瓙鍏冪礌<generator class="">,鍏朵腑class鐨勫彇鍊煎彲浠ヤ負increment銆?/span>identity銆?/span>sequence銆?/span>hilo銆?/span>native……絳夛紝鏇村鐨勫彲鍙傝?/span>hibernate鍙傝冩枃妗ｏ紝涓鑸彇鍏跺間負native 銆?/span>
generator class="assigned“鑰岀被鍨?/span>type="java.lang.Integer”濡傛灉涓婚敭鏃惰嚜鍔ㄥ闀跨殑Int鍨嬶紝鎶?/span>assigned鏀規垚鑷姩澧為暱鐨?/span>Identity錛?/span>assigned鏄嚜鍔ㄥ闀跨殑varchar鍨嬬殑銆?/span>
3. org.hibernate.PropertyValueException
鏁版嵁搴撶殑琛ㄩ噷瀛楁璁炬湁not null錛屾墽琛?/span>dao.delete(op); 鏃跺嚭鐜板紓甯革細
org.hibernate.PropertyValueException: not-null property references a null or transient value: com.easyfile.util. Operators. operatorid
鍦?/span>OperatorsDAO.java涓?/span>private static Logger logger = Logger.getLogger(AdminAction.class);榪欏彞騫舵病鏈夋樉寮忓湴鑷姩鍔犺澆Id榪囨潵錛岃繕鏄渶瑕?/span>dao.getSession().load(op,op.getOperatorid());鏉ュ姞杞?/span>id銆傚畬鏁寸殑浠ｇ爜濡備笅錛?/span>
String operatorid = request.getParameter("delOperatorid");
OperatorsDAO dao=new OperatorsDAO();
Transaction tran=dao.getSession().beginTransaction();
Operators op = new Operators();
op.setOperatorid(Integer.parseInt(operatorid));
dao.getSession().load(op,op.getOperatorid());
dao.delete(op);
tran.commit();
dao.getSession().close();
4. null id in entry (don't flush the Session after an exception occurs)
浜х敓璇ュ紓甯鎬俊鎭湁2縐嶅彲鑳斤細
Ø 鎴戜滑娌℃湁涓烘暟鎹腑鐨勯潪絀哄瓧孌佃緗箋傚鏋滄垜浠湪閫氳繃Hibernate澧炲姞涓鏉¤褰曠殑鏃跺欐垜浠繀欏繪樉寮忕殑閫氳繃setXxx鏂規硶涓鴻灞炴ц祴鍊?/span>(/榛樿鍊?/span>)銆傚洜涓哄湪淇濆瓨涔嬪墠Hibernate浼氭鏌ヨ闈炵┖瀛楁瀵瑰簲鐨勫疄浣撳睘鎬ф槸鍚︿負絀恒傚鏋滀笉鎯蟲樉寮忚祴鍊肩殑璇濓紝鎴戜滑鍙互閫氳繃xxx.hbm.xml閰嶇疆鏂囦歡鏉ュ疄鐜幫紝涔熷氨鏄湪閰嶇疆鏂囦歡涓粰鍑鴻瀛楁鐨勯粯璁ゅ箋傛垨鑰呭湪浣犵殑綾諱腑璁劇疆榛樿鍊煎氨琛屼簡銆傛敞鎰忕殑鏄?/span>rename鏁版嵁搴撲繚鐣欏瓧孌點?/span>
Ø 鍦?/span>hibernate鐨勯厤緗枃浠朵腑錛屾湁鐨勫厓绱犳湁unique灞炴х殑閰嶇疆錛屽畠鍦ㄦ暟鎹坊鍔犳椂騫朵笉璧蜂換浣曚綔鐢紝鍙湪浠?/span>hbm鏂囦歡鐢熸垚ddl璇彞鏃舵墠鏈変綔鐢紝騫朵笉浼氬湪榪愯鏃舵牎楠屾暟鎹傞槻姝㈡暟鎹噸澶嶆坊鍔狅紝瑕佷箞鍦ㄦ暟鎹簱涓婂緩绔嬪敮涓绱㈠紩錛堟暟鎹簱淇濊瘉錛夛紝瑕佷箞鍦ㄦ彃鍏ユ椂鎻愬墠鏍￠獙錛堜漢涓轟繚璇侊級銆傚綋鐒訛紝澶氭暟鎯呭喌涓嬫槸涓よ呯粨鍚堛?/span>
5. org.hibernate.hql.ast.QuerySyntaxException
Ø 鎸佷箙綾誨啓閿欎簡錛岃涓嶅氨鏄啓鎴愪簡鏁版嵁搴撹〃鍚?/span>
Ø hibernate3.0涓嶆敮鎸?/span>select涓祵濂楁煡璇紝鎹from涓篃涓嶈錛屽彧鏀寔where涓祵濂楁煡璇紝濂藉儚3.1鏀寔浜?/span>select涓祵濂?/span>
Ø sql璇彞涓瓧孌墊槸鐢ㄤ簡淇濈暀鍏抽敭瀛?/span>
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