ï»??xml version="1.0" encoding="utf-8" standalone="yes"?>日本1级在线,亚洲影视一区,亚洲最好看的视频 http://www.aygfsteel.com/improviser/category/26127.htmlæ€ç»´æ˜¯ä¸€¿U艺术,艺术需è¦çµæ„?/description>zh-cn Mon, 08 Oct 2007 16:18:00 GMT Mon, 08 Oct 2007 16:18:00 GMT 60 Hibernate夜未çœ?ä¸? http://www.aygfsteel.com/improviser/archive/2007/10/08/150944.htmlimproviser improviser Sun, 07 Oct 2007 16:42:00 GMT http://www.aygfsteel.com/improviser/archive/2007/10/08/150944.html http://www.aygfsteel.com/improviser/comments/150944.html http://www.aygfsteel.com/improviser/archive/2007/10/08/150944.html#Feedback 3 http://www.aygfsteel.com/improviser/comments/commentRss/150944.html http://www.aygfsteel.com/improviser/services/trackbacks/150944.html 阅读全文 ]]> Hibernate夜未çœ?ä¸? http://www.aygfsteel.com/improviser/archive/2007/10/07/150764.htmlimproviser improviser Sat, 06 Oct 2007 16:27:00 GMT http://www.aygfsteel.com/improviser/archive/2007/10/07/150764.html http://www.aygfsteel.com/improviser/comments/150764.html http://www.aygfsteel.com/improviser/archive/2007/10/07/150764.html#Feedback 1 http://www.aygfsteel.com/improviser/comments/commentRss/150764.html http://www.aygfsteel.com/improviser/services/trackbacks/150764.html
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11ã€formula属æ€?br />   propertyå…ƒç´ ä¸çš„formula属性用于指定一个SQL表达å¼ï¼Œå¯è°ƒç”¨SQLå‡½æ•°è´§åŒ…æ‹¬åæŸ¥è¯¢ã€?br />   <property name = "totalPrice" formula = "(select sum(o.price) from ORDERS o where o.CUSTUMER_ID = '1222')"/>    当查询CUSTOMER对象æ—Óž¼Œæ‰§è¡Œè¯å¥åQšselect ID,NAME,(select SUM(O.PRICE) from ORDERS o where o.CUSTOMER_ID = '1222') from CUSTOMERS; 12ã€dynamic-insertå’Œdynamic-update Â Â Â åº”ç”¨ä¸æŠŠclassä¸dynamic-insertå’Œdynamic-update倯D®¾ä¸ºtrueå¯ä»¥æé«˜æ•ˆçއåQŒå³æ’入时仅包å«å—段å–å€ég¸ä¸ºnull的嗌Dµï¼Œæ›´æ–°æ—¶ä»…包å«å—段值å‘生å˜åŒ–的属性ã€?/font> 13ã€Hibernateä¸package属æ€?br />   packageå±žæ€§ç”¨äºŽæŒ‡å®šæœ¬æ˜ å°„æ–‡äšgä¸åŒ…å«ç±»çš„包å䨓(f¨´)全局包,从而ä¸å¿…䨓(f¨´)æ¯ä¸ª¾cÀLŒ‡å®šå®Œæ•´åŒ…åã€?/font> 14ã€OID    Hibernateä¸ç”¨å¯¹è±¡æ ‡è¯†½W¦OIDæ¥ç»´æŒjava对象和表ä¸è®°å½•的对应关系åQŒOID定义为整数类åž?shortã€intã€long),通常由Hibernate或通过底层数æ®åº“ç»™OID赋倹{€?/font> 15ã€æ ‡è¯†ç¬¦ç”Ÿæˆå™?br />   Hibernateä¸å†…¾|®æ ‡è¯†ç¬¦ç”Ÿæˆå™¨ï¼Œå‡é€‚åˆä»£ç†ä¸»é”®    incrementåQšç”±Hibernateè‡ªå¢žç”Ÿæˆ Â Â Â identityåQšç”±åº•层数æ®åº“生æˆ?br />   sequenceåQšåº•层数æ®åº“åºåˆ—ç”Ÿæˆ Â Â Â hiloåQšæ ¹æ®high/low½{‰ç®—法生æˆä»¥ç‰¹å®šè¡¨å—ŒDµä½œhighå€?br />   nativeåQšè‡ªåŠ¨é€‰æ‹©identityã€dequenceã€hilo    assgnedåQšè‡ªç„¶ä¸»é”?ž®½é‡é¿å…使用) 16ã€inverse属æ€?br />   为é¿å…Hibernate在清ç†ç¼“å˜æ—¶å¯¹ç›¸å…Œ™”对象都执行更新æ“作,ž®†inverse讄¡½®ä¸ºtrueåQŒå°†ä¸ÀLާæƒäº¤¾l™many一方,以仅控mamyæ–¹çŠ¶æ€æ›´æ–°å¯¹è±¡ã€?/font> 17ã€cascade属æ€?br />   ¾U§è”属性,当cascade属性设¾|®äØ“(f¨´)deleteåQŒåœ¨åˆ é™¤ä¸€å¯¹è±¡æ—¶è‡ªåŠ¨åˆ é™¤ä¸Žå…¶çñ”è”的对象åQŒåˆ é™¤åŽæŒä¹…化对象å˜ä¸ÞZÍ(f¨´)时状æ€ã€?/font> 18ã€session清熾~“å˜æ—‰™—´ç‚?br />   aã€commit()时先清熾~“å˜åQŒå†å‘DATABASEæäº¤äº‹åŠ¡    bã€æ‰§è¡Œfind()å’Œiterate()æ—Óž¼Œ¼‹®ä¿å¯¹è±¡æœ€æ–°çжæ€ï¼ˆiterateåQˆï¼‰åœ¨Hibernate 3åQƒå·²å–消 åQ?br />   cã€æ˜¾å¼è°ƒç”¨flush()æ–ÒŽ(gu¨©)³•æ—?/font> 19ã€æŒä¹…化对象三状æ€?br />   aã€äÍ(f¨´)时状æ€ï¼ŒåˆšnewåQŒä¸å¤„于session¾~“å˜ä¸?br />   bã€æŒä¹…化状æ€ï¼Œå·²æŒä¹…化òq¶åŠ å…¥sessionä¸?br />   cã€æ¸¸¼›Èжæ€ï¼Œè¢«æŒä¹…化åQŒä½†ä¸åœ¨sessionä¸?/font> 20ã€load()å’Œget()    两者都å¯ä»¥ç”±O(ji¨¡n)IDåŠ è²ä¸€ä¸ªæŒä¹…化对象åQŒå½“DBä¸ä¸å˜åœ¨ä¸ŽOID对应记录æ—Óž¼Œload()æ–ÒŽ(gu¨©)³•ä¼?x¨¬)抛出异常,而get()ä¼?x¨¬)返回Null倹{€?br />   待箋... åQ?font color="#ff3300">转è²è¯äh³¨æ˜Žå‡ºå¤?/font>åQ?br />
]]> Hibernate夜未çœ?ä¸? http://www.aygfsteel.com/improviser/archive/2007/10/06/150635.htmlimproviser improviser Fri, 05 Oct 2007 19:06:00 GMT http://www.aygfsteel.com/improviser/archive/2007/10/06/150635.html http://www.aygfsteel.com/improviser/comments/150635.html http://www.aygfsteel.com/improviser/archive/2007/10/06/150635.html#Feedback 7 http://www.aygfsteel.com/improviser/comments/commentRss/150635.html http://www.aygfsteel.com/improviser/services/trackbacks/150635.html    Hibernateå†¬çœ ä¹‹æ„åQ何æ¥å¤œæœªçœ åQŸä½•解之有ï¼åQŸæ˜¯æ—¶å‡Œæ™?ç‚ÒŽ(gu¨©)¥é’Ÿï¼Œå¾—è§£åQ?br />    我的...    H    ibernateæ‹ùN”¦... 1ã€Object Relation Mapping   æŒä¹…化类与关¾p»è¡¨å¯¹åº”åQŒæŒä¹…化¾cÕd®žä¾‹ä¸Žè¡¨ä¸ä¸€è¡Œè®°å½•对应ã€?/font> 2ã€Hibernateæ ¸å¿ƒæŽ¥å£ Â Â è®‰K—®æ•°æ®åº“接å£ï¼š(x¨¬)Sessionã€Transationã€Queryã€Criteria   é…ç½®Hibernate接å£åQšConfiguration   Configuration --(实例化创å»?-->SessionFaction--(实例åŒ?-->Session---->(Qurey/Criteria/Transaction) 3ã€Hibernate使用æ¥éª¤   aã€åˆ›å»ºHibernateé…置文äšg   bã€åˆ›å»ºæŒä¹…化¾c?br />  cã€åˆ›å»ºå¯¹è±¡å…³¾pÀL˜ ž®„æ–‡ä»?br />  dã€é€šè¿‡æŽ¥å£è®‰K—®DATABASE 4ã€æŒä¹…化¾c?br />  被HibernateæŒä¹…化到数æ®åº“ä¸åQŒé€šè¿‡Setterå’ŒGetteræ–ÒŽ(gu¨©)³•åQŒè‹¥ä¸ºboolean型则å¯ç”¨is*æ–ÒŽ(gu¨©)³•。Hibernateä¸è¦æ±‚æŒä¹…化¾cÕd¿…™åÕd®žçްSerializableåQŒä½†åœ¨åˆ†å¸ƒå¼ä¸åŒ¾l“ç‚¹é—´ä¼ è¾“æŒä¹…化¾cÕd¿…™åÕd®žçްSerializable接å£ã€?/font> 5ã€Hibernate与EJB   Hibernate为普通JAVA¾c»ï¼Œè€ŒEJB必须实现EJBå„个接å£åQŒè¿è¡ŒäºŽå®¹å™¨ä¹‹ä¸ã€?/font> 6ã€é“¾¾~–ç¨‹é£Žæ ¼(åˆå§‹åŒ?   sessionFactory åQ?new Configuration()              .addClass(AAA.class)              .buildSessionFactory(); 7ã€æ‰§è¡Œæ•°æ®åº“æ“作   åˆå§‹åŒ–åŽç”±sessionFactory.openSession()æ–ÒŽ(gu¨©)³•获得session实例åQŒåƈ由session实例执行数æ®åº“有å…Ïx“作,save()ã€update()ã€delete()ã€load()ã€find()ã€?/font> 8ã€å±žæ€§ä½œç”¨èŒƒå›?br />Â Â åœ¨æ˜ ž®„文件ä¸å…ƒç´ classä¸å±žæ€§scopeåQfield讄¡½®å…¨å±€å±žæ€§ä½œç”¨åŸŸåQ?br />Â Â åœ¨æ˜ ž®„文件ä¸å…ƒç´ propertyä¸scopeåQfield讄¡½®ä¸ºå±€éƒ¨å±žæ€§ä½œç”¨èŒƒå›´ã€?/font> 9ã€æŒä¹…化¾c»è®¿é—®æ–¹æ³?br />  用户--->应用½E‹åº--->Setter()<---Hibernate<---DATABASE   用户<---应用½E‹åº<---Getter()--->Hibernate--->DATABASE 10ã€æŒä¹…化¾cÖM¸åŠ å…¥½E‹åºé€»è¾‘   Student¾cÖM¸åŒ…å«firstNameã€lastNameåQŒSTUDENT表ä¸åªæœ‰NAMEå—æ®µ   getName()   {       return firstName+lastName;   }   setName(String name)   {       firstName = ...;       lastName = ...;   }   Hibernateæ˜ å°„æ–‡äšgä¸åªéœ€è¦æ˜ ž®„nameå’ŒNAME<property name="name" column="NAME"/>,ž®±å¯ä»¥è®¿é—®setName()å’ŒgetName()æ–ÒŽ(gu¨©)³•åQŒä»¥æ˜ å°„æ–‡äšg为准ã€?br />   待箋...  (转è²è¯äh³¨æ˜Žå‡ºå¤?/font>)Â
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