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Effective Java 71 Use lazy initialization judiciously
You should initialize most fields normally, not lazily. If you must initialize a field lazily in order to achieve your performance goals, or to break ...
分类:编程语言   时间:2014-05-09 18:32:56    阅读次数:497
Oracle sysdate常用
SELECT * FROM (SELECT * FROM calenderDetail A ORDER BY a. calender desc ) WHERE rownum <3 ;//计算时间大于当前时间的最近2条记录取当前小时,以及相隔一小时v_begin_date:=to_date(to_ch...
分类:数据库   时间:2014-05-09 17:03:41    阅读次数:620
SQL中自定义拆分为新表的函数
/*按照符号分割字符串*/create function [dbo].[m_split](@c varchar(2000),@split varchar(2)) returns @t table(col varchar(200)) as begin wh...
分类:数据库   时间:2014-05-09 12:18:45    阅读次数:376
备份3个判断指针是否有效的函数,以备不时之需
BOOLEAN MmIsAddressValid( _In_PVOID VirtualAddress);ParametersVirtualAddress[in]A pointer to the nonpaged virtual address to check. The caller must e....
分类:其他好文   时间:2014-05-09 11:51:40    阅读次数:535
iOS 打电话 发短信(转载)
官方代码发短息和邮件添加MessageUI.framework 库发送信息- (IBAction)showSMSPicker:(id)sender{ // You must check that the current device can send SMS messages before you ...
分类:移动开发   时间:2014-05-08 20:26:04    阅读次数:500
easy ui treegrid使用
返回数据格式:{"total":7,"rows":[ {"id":1,"name":"All Tasks","begin":"3/4/2010","end":"3/20/2010","progress":60,"iconCls":"icon-ok"}, {"id":2,"name":"Designi...
分类:其他好文   时间:2014-05-05 11:02:30    阅读次数:355
5989
$\bf命题1:$$n$阶实对称阵$A$的第一行乘以一个正数不改变其正特征值的个数证明:设$B = diag\left( {k,{E_{n - 1}}} \right)A$,其中$k > 0$,则\[\begin{array}{l}diag\left( {\frac{1}{{\sqrt k }},{...
分类:其他好文   时间:2014-05-04 20:01:17    阅读次数:1494
989
$\bf命题2:$任意方阵$A$均可分解为可逆阵$B$与对称阵$C$之积证明:设$r\left( A \right) = r$,则存在可逆阵$P,Q$,使得\[A = P\left( {\begin{array}{*{20}{c}}{{E_r}}&0\\0&0\end{array}} \right)...
分类:其他好文   时间:2014-05-04 19:47:13    阅读次数:587
9855
$\bf命题1:$设$\int_a^{ + \infty } {f\left( x \right)dx} $收敛,若$\lim \limits_{x \to \begin{array}{*{20}{c}} {{\rm{ + }}\infty } \end{array}} f\left( x \rig...
分类:其他好文   时间:2014-05-04 19:22:03    阅读次数:1000
firefox is already running..在linux中使用firfox出现的问题
中文版显示:Firefox 已经在运行,但是没有响应。如要打开新窗口,您必须先关闭该 Firefox 进程,或者重新启动您的系统。 英文版显示:Firefox is already running, but is not responding. To open a new window, you must first close the existing Firefox process, or ...
分类:系统相关   时间:2014-05-04 17:44:21    阅读次数:647
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