Thu, 21 Jan 2010 10:03:00 GMTCSDN博客聚合服务http://blog.csdn.net/blogrss.aspx?username=hjfjoyhttp://blog.csdn.net/hjfjoy/archive/2010/01/21/5221644.aspxArcEngine 唯一值查询<br />关键字: arcengine 唯一值 查询 distinct 转载:http://blog.csdn.net/mydriverc/archive/2007/07/26/1709210.aspx<br />评论;我试验了,其实可以使用IqueryFilter.subField="distinct(FiledName)"直接Search 就行 <br /><br />有时我们需要读取图层中某个字段的所有值的唯一值集合，或做统计用途，或作为其他功能的输入。 <br />一般通过IDataStatistics接口来获取唯一值集合，代码如下： <br />Java代码 '''    ''' 通过IDataStatistic接口获取图层指定字段的唯一值   '''    ''' 目标图层   ''' 目标字段名   ''' 目标字段的所有值的唯一值集合<img src="http://www1.feedsky.com/t1/324086231/hjfjoy/csdn.net/s.gif?r=http://blog.csdn.net/hjfjoy/archive/2010/01/21/5221644.aspx" border="0" height="0" width="0" style="position:absolute" /><p class="fswww1"><a href="http://www1.feedsky.com/r/l/csdn.net/hjfjoy/324086231/art01.html" target="_blank"><img border="0" ismap="ismap" src="http://www1.feedsky.com/r/i/csdn.net/hjfjoy/324086231/art01.gif" onerror="this.style.display='none'" /></a></p>Thu, 21 Jan 2010 18:03:00 +0800hjfhttp://blog.csdn.net/hjfjoy/archive/2010/01/21/5221644.aspxhjfhttp://blog.csdn.net/hjfjoy/archive/2010/01/21/5221644.aspxhttp://blog.csdn.net/hjfjoy/feed.aspxcsdn.net/hjfjoy/~7396706/324086231/5506225http://blog.csdn.net/hjfjoy/archive/2009/11/16/4816455.aspx<br />世事洞明皆学问，人情练达即文章。做ASP时，最常用的数据库即Sqlserver与Access数据库莫属了！<br />但使用会经常发现很多SQL执行的问题。这里整理出之间的差异，做个十大差异的总结。<br />ACCESS结构简单容易处理，而且也能满足多数的网站程序要求，也是初学者的试牛刀。<br />ACCESS是小型数据库，既然是小型就有他根本的局限性： <br />1）、数据库过大，一般ACCESS数据库达到50M左右的时候性能会急剧下降！ <br />2）、网站访问频繁，经常超过100人的在线时，处理速度会有影响！ <br />3）、记录数过多，一般记录数达到10万条左右的时候性能就会急剧下降！<br />微软公司为了与ACCESS高低搭配的一种高端方案：改用了Sqlserver，但语法会有一些差异。<br />1、select，update语句区别<br />select，update对于单表操作时基本一致。   <br />但多表操作时update语句的区别ACCESS与SQLSERVER中的UPDATE语句会有差别：<br />SQLSERVER中更新多表的U<img src="http://www1.feedsky.com/t1/324086232/hjfjoy/csdn.net/s.gif?r=http://blog.csdn.net/hjfjoy/archive/2009/11/16/4816455.aspx" border="0" height="0" width="0" style="position:absolute" /><p class="fswww1"><a href="http://www1.feedsky.com/r/l/csdn.net/hjfjoy/324086232/art01.html" target="_blank"><img border="0" ismap="ismap" src="http://www1.feedsky.com/r/i/csdn.net/hjfjoy/324086232/art01.gif" onerror="this.style.display='none'" /></a></p>Mon, 16 Nov 2009 16:08:00 +0800hjfhttp://blog.csdn.net/hjfjoy/archive/2009/11/16/4816455.aspxhjfhttp://blog.csdn.net/hjfjoy/archive/2009/11/16/4816455.aspxhttp://blog.csdn.net/hjfjoy/feed.aspxcsdn.net/hjfjoy/~7396706/324086232/5506225http://blog.csdn.net/hjfjoy/archive/2009/10/28/4738182.aspxSOA<img src="http://www1.feedsky.com/t1/324086233/hjfjoy/csdn.net/s.gif?r=http://blog.csdn.net/hjfjoy/archive/2009/10/28/4738182.aspx" border="0" height="0" width="0" style="position:absolute" /><p class="fswww1"><a href="http://www1.feedsky.com/r/l/csdn.net/hjfjoy/324086233/art01.html" target="_blank"><img border="0" ismap="ismap" src="http://www1.feedsky.com/r/i/csdn.net/hjfjoy/324086233/art01.gif" onerror="this.style.display='none'" /></a></p>Wed, 28 Oct 2009 14:21:00 +0800hjfhttp://blog.csdn.net/hjfjoy/archive/2009/10/28/4738182.aspxhjfhttp://blog.csdn.net/hjfjoy/archive/2009/10/28/4738182.aspxhttp://blog.csdn.net/hjfjoy/feed.aspxcsdn.net/hjfjoy/~7396706/324086233/5506225http://blog.csdn.net/hjfjoy/archive/2009/10/16/4679218.aspxOracle数据导入导出imp/exp命令 10g以上expdp/impdp命令<img src="http://www1.feedsky.com/t1/324086234/hjfjoy/csdn.net/s.gif?r=http://blog.csdn.net/hjfjoy/archive/2009/10/16/4679218.aspx" border="0" height="0" width="0" style="position:absolute" /><p class="fswww1"><a href="http://www1.feedsky.com/r/l/csdn.net/hjfjoy/324086234/art01.html" target="_blank"><img border="0" ismap="ismap" src="http://www1.feedsky.com/r/i/csdn.net/hjfjoy/324086234/art01.gif" onerror="this.style.display='none'" /></a></p>Fri, 16 Oct 2009 11:06:00 +0800hjfhttp://blog.csdn.net/hjfjoy/archive/2009/10/16/4679218.aspxhjfhttp://blog.csdn.net/hjfjoy/archive/2009/10/16/4679218.aspxhttp://blog.csdn.net/hjfjoy/feed.aspxcsdn.net/hjfjoy/~7396706/324086234/5506225http://blog.csdn.net/hjfjoy/archive/2009/10/16/4678934.aspxoracle 10g em、isqlplus访问不了的问题解决<img src="http://www1.feedsky.com/t1/324086235/hjfjoy/csdn.net/s.gif?r=http://blog.csdn.net/hjfjoy/archive/2009/10/16/4678934.aspx" border="0" height="0" width="0" style="position:absolute" /><p class="fswww1"><a href="http://www1.feedsky.com/r/l/csdn.net/hjfjoy/324086235/art01.html" target="_blank"><img border="0" ismap="ismap" src="http://www1.feedsky.com/r/i/csdn.net/hjfjoy/324086235/art01.gif" onerror="this.style.display='none'" /></a></p>Fri, 16 Oct 2009 10:31:00 +0800hjfhttp://blog.csdn.net/hjfjoy/archive/2009/10/16/4678934.aspxhjfhttp://blog.csdn.net/hjfjoy/archive/2009/10/16/4678934.aspxhttp://blog.csdn.net/hjfjoy/feed.aspxcsdn.net/hjfjoy/~7396706/324086235/5506225http://blog.csdn.net/hjfjoy/archive/2009/10/15/4676099.aspxwebservice的开发流程<img src="http://www1.feedsky.com/t1/324086236/hjfjoy/csdn.net/s.gif?r=http://blog.csdn.net/hjfjoy/archive/2009/10/15/4676099.aspx" border="0" height="0" width="0" style="position:absolute" /><p class="fswww1"><a href="http://www1.feedsky.com/r/l/csdn.net/hjfjoy/324086236/art01.html" target="_blank"><img border="0" ismap="ismap" src="http://www1.feedsky.com/r/i/csdn.net/hjfjoy/324086236/art01.gif" onerror="this.style.display='none'" /></a></p>Thu, 15 Oct 2009 16:06:00 +0800hjfhttp://blog.csdn.net/hjfjoy/archive/2009/10/15/4676099.aspxhjfhttp://blog.csdn.net/hjfjoy/archive/2009/10/15/4676099.aspxhttp://blog.csdn.net/hjfjoy/feed.aspxcsdn.net/hjfjoy/~7396706/324086236/5506225http://blog.csdn.net/hjfjoy/archive/2009/10/15/4674661.aspxCMemDC:在MFC下解决绘图闪烁<img src="http://www1.feedsky.com/t1/324086237/hjfjoy/csdn.net/s.gif?r=http://blog.csdn.net/hjfjoy/archive/2009/10/15/4674661.aspx" border="0" height="0" width="0" style="position:absolute" /><p class="fswww1"><a href="http://www1.feedsky.com/r/l/csdn.net/hjfjoy/324086237/art01.html" target="_blank"><img border="0" ismap="ismap" src="http://www1.feedsky.com/r/i/csdn.net/hjfjoy/324086237/art01.gif" onerror="this.style.display='none'" /></a></p>Thu, 15 Oct 2009 11:18:00 +0800hjfhttp://blog.csdn.net/hjfjoy/archive/2009/10/15/4674661.aspxhjfhttp://blog.csdn.net/hjfjoy/archive/2009/10/15/4674661.aspxhttp://blog.csdn.net/hjfjoy/feed.aspxcsdn.net/hjfjoy/~7396706/324086237/5506225http://blog.csdn.net/hjfjoy/archive/2009/09/27/4601142.aspx如果某个线程必须等待某些事件发生后才能存取相应的资源，用CEvent；如果一个应用同时可以有多个线程存取相应资源，用CSemaphore；如果有多个应用（多个进程）同时存取相应资源，用CMutex，否则用CCriticalSection。 <img src="http://www1.feedsky.com/t1/324086238/hjfjoy/csdn.net/s.gif?r=http://blog.csdn.net/hjfjoy/archive/2009/09/27/4601142.aspx" border="0" height="0" width="0" style="position:absolute" /><p class="fswww1"><a href="http://www1.feedsky.com/r/l/csdn.net/hjfjoy/324086238/art01.html" target="_blank"><img border="0" ismap="ismap" src="http://www1.feedsky.com/r/i/csdn.net/hjfjoy/324086238/art01.gif" onerror="this.style.display='none'" /></a></p>Sun, 27 Sep 2009 15:13:00 +0800hjfhttp://blog.csdn.net/hjfjoy/archive/2009/09/27/4601142.aspxhjfhttp://blog.csdn.net/hjfjoy/archive/2009/09/27/4601142.aspxhttp://blog.csdn.net/hjfjoy/feed.aspxcsdn.net/hjfjoy/~7396706/324086238/5506225http://blog.csdn.net/hjfjoy/archive/2009/07/18/4360320.aspx项目心得总结<img src="http://www1.feedsky.com/t1/324086239/hjfjoy/csdn.net/s.gif?r=http://blog.csdn.net/hjfjoy/archive/2009/07/18/4360320.aspx" border="0" height="0" width="0" style="position:absolute" /><p class="fswww1"><a href="http://www1.feedsky.com/r/l/csdn.net/hjfjoy/324086239/art01.html" target="_blank"><img border="0" ismap="ismap" src="http://www1.feedsky.com/r/i/csdn.net/hjfjoy/324086239/art01.gif" onerror="this.style.display='none'" /></a></p>Sat, 18 Jul 2009 21:14:00 +0800hjfhttp://blog.csdn.net/hjfjoy/archive/2009/07/18/4360320.aspxhjfhttp://blog.csdn.net/hjfjoy/archive/2009/07/18/4360320.aspxhttp://blog.csdn.net/hjfjoy/feed.aspxcsdn.net/hjfjoy/~7396706/324086239/5506225http://blog.csdn.net/hjfjoy/archive/2009/07/15/4350108.aspxWindows Socket五种I/O模型——代码全攻略<img src="http://www1.feedsky.com/t1/324086240/hjfjoy/csdn.net/s.gif?r=http://blog.csdn.net/hjfjoy/archive/2009/07/15/4350108.aspx" border="0" height="0" width="0" style="position:absolute" /><p class="fswww1"><a href="http://www1.feedsky.com/r/l/csdn.net/hjfjoy/324086240/art01.html" target="_blank"><img border="0" ismap="ismap" src="http://www1.feedsky.com/r/i/csdn.net/hjfjoy/324086240/art01.gif" onerror="this.style.display='none'" /></a></p>Wed, 15 Jul 2009 12:39:00 +0800hjfhttp://blog.csdn.net/hjfjoy/archive/2009/07/15/4350108.aspxhjfhttp://blog.csdn.net/hjfjoy/archive/2009/07/15/4350108.aspxhttp://blog.csdn.net/hjfjoy/feed.aspxcsdn.net/hjfjoy/~7396706/324086240/5506225