Ò׽ؽØÍ¼Èí¼þ¡¢µ¥Îļþ¡¢Ãâ°²×°¡¢´¿ÂÌÉ«¡¢½ö160KB

javaÊ÷Ðνṹ

×î½ü¿´µ½Ò»¸öÓÐÒâ˼µÄÊ÷Ðνṹ£¬ÎªÃ¿¸ö½ÚµãÌí¼ÓÁËlftºÍrgtÁ½¸öÊôÐÔ¡£ÕâÑù²éÕҸýڵãµÄ×ӽڵ㡢²éÕҸýڵãËùÓи¸½Úµã£¬¾Í²»ÓÃÈ¥µÝ¹é²éѯ£¬Ö»ÐèÒªÓÃbetween¡¢andÓï¾ä¾Í¿ÉÒÔʵÏÖ¡£ÏÂÃæÒÔ´´½¨Ò»¸öÀ¸Ä¿Ê÷ΪÀý£¬ÒÔÏÂÊÇÎÒµÄÀí½â¡£
¡¡¡¡Ò»°ãÀ´½²£¬ÎÒÃÇ´´½¨À¸Ä¿Ê÷µÄʱºò£¬´ó¶àÖ»ÐèÒªÒ»¸öÍâ¼üparentidÀ´Çø·Ö¸Ã½ÚµãÊôÓÚÄĸö¸¸½Úµã¡£Êý¾Ý¿âµÄÉè¼ÆÈçÏÂͼ£º
ÕâÑùÒ»À´£¬


1.²éÕҸýڵãµÄËùÓÐ×ӽڵ㣬ÔòÐèÒª²ÉÓÃsqlµÄµÝ¹éÓï¾ä£º

Sql´úÂë
select * from tableName connect by prior id=sj_parent_id start with  id=1  
select * from tableName connect by prior id=sj_parent_id start with id=1
 (oracle Ð´·¨£¬mysqlĿǰ²»Ö§³Ö£¬Èç¹ûmysqlÏë²éÕÒÊ÷ÐΣ¬¿ÉÒÔÀûÓô洢¹ý³Ì).

2.²éÕҸýڵãµÄ¸¸½ÚµãµÄsqlµÝ¹éÓï¾ä£º

Sql´úÂë
select * from tableName connect by prior sj_parent_id =id start with  id=1  
select * from tableName connect by prior sj_parent_id =id start with id=1
 
¡¡Èç¹ûÊý¾ÝÁ¿¹ý´ó»òÕß²ã´ÎÌ«¶à£¬ÄÇôÕâÑù²Ù×÷ÊÇ»áÓ°ÏìÐÔÄܵġ£

¡¡¡¡“ÈκÎÊ÷Ðνṹ¶¼¿ÉÒÔÓöþ²æÊ÷À´±íʾ”¡£ÆäʵÎÒÃÇ´´½¨µÄÀ¸Ä¿Ê÷¾ÍÊÇÒ»¸ö¼òÐ͵Ķþ²æÊ÷¡£¸ù¾ÝÊý¾Ý½á¹¹ÀïÃæ¶þ²æÊ÷µÄ±éÀú£¬ÔÙÉÔ΢ÐÞ¸ÄÏ£¬½«Êý¾Ý¿âÉè¼ÆÈçÏÂͼËùʾ£º

ÕâÑùÎÒÃDzéÕҸýڵãµÄËùÓÐ×ӽڵ㣬ÔòÖ»ÐèÒª²éÕÒidÔÚlftºÍrgtÖ®¼äµÄËùÓнڵ㼴¿É¡£
<!--EndFragment-->
Sql´úÂë
select * from tb_subject s,tb_subject t where s.lft between t.lft and t.rgt and t.id=1  
select * from tb_subject s,tb_subject t where s.lft between t.lft and t.rgt and t.id=1
 
2.²éÕҸýڵãµÄËùÓи¸½ÚµãµÄsqlÓï¾äΪ£º
<!--EndFragment-->
Sql´úÂë
select s.* from tb_subject s,tb_subject t where s.lft<t.lft and (s.rgt-s.lft)>1 and s.rgt>t.rgt and t.id=1  
select s.* from tb_subject s,tb_subject t where s.lft<t.lft and (s.rgt-s.lft)>1 and s.rgt>t.rgt and t.id=1
 
¡¡ÏÂÃæÀ


Ïà¹ØÎĵµ£º

javaÁìÓò¼´Ê±Í¨ÐŵĽâ¾ö·½°¸Ò»(openfire+spark+smack)

JavaÁìÓòµÄ¼´Ê±Í¨ÐŵĽâ¾ö·½°¸¿ÉÒÔ¿¼ÂÇopenfire+spark+smack¡£µ±È»Ò²ÓÐÆäËûµÄÑ¡Ôñ¡£
¡¡¡¡OpenfireÊÇ»ùÓÚJabberЭÒé(XMPP)ʵÏֵļ´Ê±Í¨ÐÅ·þÎñÆ÷¶Ë°æ±¾£¬Ä¿Ç°½¨ÒéʹÓÃ3.6.4°æ±¾£¬Õâ¸ö°æ±¾Êǵ±Ç°×îеİ汾£¬¶øÇÒÍøÉÏ¿ÉÒÔÕÒµ½ÏÂÔØµÄÔ´´úÂë¡£
¡¡¡¡¼´Ê±Í¨Ðſͻ§¶Ë¿ÉʹÓÃspark2.5.8,Õâ¸ö°æ±¾ÊÇĿǰ×îеÄrelease°æ±¾£¬¾­¹ý²âÊÔ· ......

JavaÖØÐ´ÓëÖØÔØ

ÖØÐ´µÄÖ÷ÒªÓŵãÊÇÄܹ»¶¨Òåij¸ö×ÓÀàÌØÓеÄÌØÕ÷:
       Èç:
    public class Father
    {
             public void speak()
         &nb ......

Java ÀíÂÛÓëʵ¼ù: ÓÃÈõÒýÓöÂסÄÚ´æÐ¹Â© 1

ËäÈ»Óà Java™ ÓïÑÔ±àдµÄ³ÌÐòÔÚÀíÂÛÉÏÊDz»»á³öÏÖ“ÄÚ´æÐ¹Â©”µÄ£¬µ«ÊÇÓÐʱ¶ÔÏóÔÚ²»ÔÙ×÷Ϊ³ÌÐòµÄÂß¼­×´Ì¬µÄÒ»²¿·ÖÖ®ºóÈÔÈ»²»±»À¬»øÊÕ¼¯¡£±¾Ô£¬¸ºÔð±£ÕÏÓ¦ÓóÌÐò½¡¿µµÄ¹¤³Ìʦ Brian Goetz ̽ÌÖÁËÎÞÒâʶµÄ¶ÔÏó±£ÁôµÄ³£¼ûÔ­Òò£¬²¢Õ¹Ê¾ÁËÈçºÎÓÃÈõÒýÓöÂסй©¡£
ÒªÈÃÀ¬»øÊÕ¼¯£¨GC£©»ØÊÕ³ÌÐò²»ÔÙʹÓõĶÔÏ󣬶 ......

Java ÀíÂÛºÍʵ¼ù: ÓÃÈíÒýÓÃ×èÖ¹ÄÚ´æÐ¹Â© 2

ÔÚ Java ÀíÂÛºÍʵ¼ù µÄ ǰһÆÚÎÄÕ ÖУ¬Java™ Çå½à¹¤³Ìʦ Brian Goetz ̽¾¿ÁËÈõÒýÓã¨weak references£©£¬ËüÈÃÄú¾¯¸æÀ¬»øÊÕ¼¯Æ÷£¬ÄúÏëҪά»¤Ò»¸ö¶ÔÏóµÄÒýÓ㬶ø²»»á×èÖ¹¸Ã¶ÔÏó±»À¬»øÊÕ¼¯¡£ÔÚ±¾ÆÚÎÄÕÂÖУ¬Ëû½«½âÊÍ Reference ¶ÔÏóµÄÁíÍâÒ»ÖÖÐÎʽ£¬¼´ÈíÒýÓã¨soft references£©£¬ÓÃÓÚ°ïÖúÀ¬»øÊÕ¼¯Æ÷¹ÜÀíÄÚ´æÊ¹ÓúÍÏû³ýÇ ......

JAVAËÄÖÖ»ù±¾ÅÅÐòµÄ×ܽá

JAVAËÄÖÖ»ù±¾ÅÅÐò,°üÀ¨Ã°ÅÝ·¨,²åÈë·¨,Ñ¡Ôñ·¨,SHELLÅÅÐò·¨.ÆäÖÐÑ¡Ôñ·¨ÊÇðÅÝ·¨µÄ¸Ä½ø,SHELLÅÅÐò·¨ÊÇ ²åÈë·¨µÄ¸Ä½ø.ËùÒÔ´Ó¸ù±¾ÉÏÀ´Ëµ¿ÉÒÔ¹éÄÉΪÁ½ÖÖ²»Í¬µÄÅÅÐò·½·¨:¼´:²åÈë·¨£¦Ã°ÅÝ·¨
Ò» ²åÈë·¨:±éÀúÅÅÐò¼¯ºÏ£¬Ã¿µ½Ò»¸öÔªËØÊ±£¬¶¼Òª½«Õâ¸öÔªËØÓëËùÓÐËü֮ǰµÄÔªËØ±éÀú±È½ÏÒ»±é£¬È÷ûºÏÅÅÐò˳ÐòµÄÔªËØ°¤¸öÒÆ¶¯µ½µ±Ç°·¶Î§ÄÚËü×î ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØÍ¼ | ¸ÓICP±¸09004571ºÅ