https://blog.youkuaiyun.com/TangKai_javazh-cnhttps://blog.youkuaiyun.com/https://blog.youkuaiyun.com/TangKai_java/article/details/126867721https://blog.youkuaiyun.com/TangKai_java/article/details/126867721TangKai_javaThu, 15 Sep 2022 11:28:08 +0800https://blog.youkuaiyun.com/TangKai_java/article/details/105564442https://blog.youkuaiyun.com/TangKai_java/article/details/105564442TangKai_javaSat, 18 Apr 2020 20:09:21 +0800https://blog.youkuaiyun.com/TangKai_java/article/details/105432929https://blog.youkuaiyun.com/TangKai_java/article/details/105432929TangKai_javaFri, 10 Apr 2020 14:41:56 +0800https://blog.youkuaiyun.com/TangKai_java/article/details/50498212https://blog.youkuaiyun.com/TangKai_java/article/details/50498212TangKai_javaMon, 11 Jan 2016 17:33:14 +0800https://blog.youkuaiyun.com/TangKai_java/article/details/7860062https://blog.youkuaiyun.com/TangKai_java/article/details/7860062TangKai_javaMon, 13 Aug 2012 14:48:16 +0800https://blog.youkuaiyun.com/TangKai_java/article/details/7764242https://blog.youkuaiyun.com/TangKai_java/article/details/7764242TangKai_javaThu, 19 Jul 2012 17:49:35 +0800https://blog.youkuaiyun.com/TangKai_java/article/details/7755537https://blog.youkuaiyun.com/TangKai_java/article/details/7755537TangKai_javaTue, 17 Jul 2012 16:02:47 +0800https://blog.youkuaiyun.com/TangKai_java/article/details/7262170https://blog.youkuaiyun.com/TangKai_java/article/details/7262170TangKai_javaWed, 15 Feb 2012 18:06:21 +0800https://blog.youkuaiyun.com/TangKai_java/article/details/6793208https://blog.youkuaiyun.com/TangKai_java/article/details/6793208TangKai_javaTue, 20 Sep 2011 12:17:15 +0800https://blog.youkuaiyun.com/TangKai_java/article/details/6548605https://blog.youkuaiyun.com/TangKai_java/article/details/6548605TangKai_javaThu, 16 Jun 2011 15:19:00 +0800https://blog.youkuaiyun.com/TangKai_java/article/details/6184061https://blog.youkuaiyun.com/TangKai_java/article/details/6184061TangKai_javaMon, 14 Feb 2011 14:55:00 +0800 
当某个数据库用户在数据库中插入、更新、删除一个表的数据，或者增加一个表的主键时或者表的索引时，常常会出现ora-00054:resource busy and acquire with nowait specified这样的错误。
主要是因为有事务正在执行（或者事务已经被锁），所有导致执行不成功。
1、用dba权限的用户查看数据库都有哪些锁
select t2.username,t2.sid,t2.serial#,t2.logon_time
]]>https://blog.youkuaiyun.com/TangKai_java/article/details/6122386https://blog.youkuaiyun.com/TangKai_java/article/details/6122386TangKai_javaFri, 07 Jan 2011 13:25:00 +0800在客户端查询数据的时候，有时候会出现明明有数据，但是还是显示查不到数据，再点击查询或多查几次又能查出来，很是郁闷，查看服务器日志，发现了如下错误:
2011-01-07 08:49:31,604 ERROR [STDERR] java.sql.SQLException: ORA-04068: existing state of packages has been discarded ORA-04061: existing state of package body "ISGIS.GI]]>https://blog.youkuaiyun.com/TangKai_java/article/details/6086356https://blog.youkuaiyun.com/TangKai_java/article/details/6086356TangKai_javaMon, 20 Dec 2010 10:44:00 +0800select floor(25.56),ceil(25.56) from dual;
--结果:  25   26
select trunc(25.56) from dual; 返回25
--这个直接去掉小数点后面的值，当然也可以给小数位数如trunc(25.56,1) 返回25.5,
  这个函数用在操作日期上很好用，如要取得今天的0时0分0秒  trunc(sysdate)]]>https://blog.youkuaiyun.com/TangKai_java/article/details/6065153https://blog.youkuaiyun.com/TangKai_java/article/details/6065153TangKai_javaThu, 09 Dec 2010 12:27:00 +0800本来已经获得图片了的，但是想通过点击超链接下载图片，浏览器都是直接打开图片了，使用JS来控制只兼容IE,麻烦，只有通过struts2设置报头域来下载了！其实这里没什么技术含量，我只是打算记下ByteArrayInputStream这个类的用法，以前没注意，现在有了这个类，下载保存在数据库中的文件就省了好多事！
action配置:
 

 
第二种:
https://blog.youkuaiyun.com/TangKai_java/article/details/6060785https://blog.youkuaiyun.com/TangKai_java/article/details/6060785TangKai_javaTue, 07 Dec 2010 15:21:00 +0800各种loading加载中gif图标 - 图片图标 - GIF图片 - 免费模板网
http://www.865171.cn/icons/gif/detail-6174.aspx]]>https://blog.youkuaiyun.com/TangKai_java/article/details/6059861https://blog.youkuaiyun.com/TangKai_java/article/details/6059861TangKai_javaTue, 07 Dec 2010 09:55:00 +0800 
在烈火网看到的可拖动的遮罩圆角层，留下来！