OpenCV显示视频帧时出现一个问题,就是imshow之后若是不加waitkey则无法显示,找了很久也没找到原因. 只是发现也有人发现这个问题: cvWaitKey(x) / cv::waitKey(x) does two things: It waits for x milliseconds for a key press. If a key was pressed during that time, it returns the key's ASCII code. Otherwise,
using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Collections; using System.IO; using System.Net.Sockets; using System.Threading; namespace ConsoleApplication1 { class Program { static void Main(string
转载链接:http://www.jb51.net/article/50161.htm 这篇文章主要介绍了Oracle外键不加索引引起死锁的情况及解决,需要的朋友可以参考下 --创建一个表,此表作为子表 create table fk_t as select * from user_objects; delete from fk_t where object_id is null; commit; --创建一个表,此表作为父表 create table pk_t as select * from
一.外部的为全局,内部的为局部变量. 二.加var为局部变量(在方法内),不加var为全局变量(当方法内有一次使用后) <script type="text/javascript"> var golbe="global"; test(); function test(){ var local="local"; document.write(golbe); document.write(local); } document.wr
我的习惯写法,担心不加 in 条件 ,统计结果会包含其他的数据 SELECT ZWKMYE_KJND as 年度,ZWKMYE_KJQJ as 月份,ZWKMYE_DWBH as 单位, ' then ZWKMYE_JFFS end) 税金, ' then ZWKMYE_DFFS end) 其他业务收入, ' then ZWKMYE_JFFS end) 其他业务支出 , ' then ZWKMYE_JFFS end) 营业费用, ' then ZWKMYE_JFFS end) 管理费用, ' t