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1) JDOMµÄ×é³É.ÈκÎÒ»¸ö¿ò¼Ü¶¼ÓÐ×Ô¼ºµÄ×é³É½á¹¹,JDOMËä˵²»ÉÏÊÇÒ»¸ö¿ò¼Ü,ÒòΪËýûÓÐÌṩ¸øÎÒÃÇÈκεÄÀ©Õ¹¿ò¼Ü.Èç¹û˵ÆäÊÇÒ»¸ö¹¤¾ß,ÄÇôËýÊÇÒ»¸ö½á¹¹·Ç³£¼òµ¥µÄXML²Ù×÷¹¤¾ß,Æä°ü²åÈçϰü: org.JDOM org.JDOM.input org.JDOM.output org.JDOM.adapters org.JDOM.transfor
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1¡¢outer- join ¹Ø¼ü×Ö(many-to-oneµÄÇé¿ö) outer- join ¹Ø¼ü×ÖÓÐ3¸öÖµ£¬·Ö±ðÊÇtrue,false,auto,ĬÈÏÊÇauto¡£ true: ±íʾʹÓÃÍâÁ¬½Óץȡ¹ØÁªµÄÄÚÈÝ£¬ÕâÀïµÄÒâ˼Êǵ±Ê¹ÓÃload(OrderLineItem.class,id)ʱ£¬ Hibernate Ö»Éú³ÉÒ»ÌõSQLÓï¾ä½«OrderLineItemÓëËûµÄ¸¸Ç×OrderÈ«
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Fetching strategies(È¡²ßÂÔ) Fetching stategiesÊÇÖ¸hibernateÔÚÐèÒª¹ØÁªÊý¾ÝµÄʱºòËù²ÉÓõÄÈ¡¹ØÁªÊý¾ÝµÄ²ßÂÔ¡£Õâ¸ö²ßÂԼȿÉÒÔÔÚO/RÓ³ÉäÎļþÀïÅ䣬Ҳ¿ÉÒÔͨ¹ýÌØÊâµÄ HQL:»òCriteriaÓï¾äʵÏÖ¡£ Hibernate¶¨ÒåÁËÒÔÏÂÈ¡²ßÂÔ£º Join fetching : HibernateÈ¡¹ØÁªÊý¾Ý»ò¼¯ºÏ
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1¡¢Õë¶ÔoracleÊý¾Ý¿â¶øÑÔ£¬Fetch Size ÊÇÉ趨JDBCµÄStatement¶ÁÈ¡Êý¾ÝµÄʱºòÿ´Î´ÓÊý¾Ý¿âÖÐÈ¡³öµÄ¼Ç¼ÌõÊý£¬Ò»°ãÉèÖÃΪ30¡¢50¡¢100¡£OracleÊý¾Ý¿âµÄJDBC Çý¶¯ ĬÈϵÄFetch Size=15£¬ÉèÖÃFetch SizeÉèÖÃΪ£º30¡¢50£¬ÐÔÄÜ»áÓÐÃ÷ÏÔÌáÉý£¬Èç¹û¼ÌÐøÔö´ó£¬³¬³ö100£¬ÐÔÄÜÌáÉý
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