Computer Science An Overview _J. Glenn Brookshear _11th Edition Such communication needs have long been a topic of study among computer scientists, and many newer programming languages reflect various approaches to thread interaction problems. As an…

原文链接: http://blog.csdn.net/lopper/article/details/5293545 今天同事在编制一个数据库脚本的时候,提示了This data item is already used in a primary identifier.的错误. 处理的方法为: 菜单栏上的“tool”-〉“Model Option”-〉“Model Setting” 把右边的“Data Item”数据框中的“Unique code”选项框取消掉. 如果在由CDM-〉PDM转换的时候…

场景模拟: 本机安装有arcgis desktop以及arcgis server10.1,server的站点账号为arcgis. 需要发布影像服务并进行切片,使用的影像数据存放在远程服务器上,影像较大,拷贝到本地困难,且本地已无磁盘空间存放. 步骤 1.在远程服务器上找到需要使用的影像数据文件夹并设置共享以及赋予arcgis用户权限(与本机arcgis server用户一致,若远程服务器上没有该用户,则手动创建). 2.本机Catalog中建立影像连接,本地创建服务发布所需的mxd文件. 3.本…

解决PowerDesigner提示This data item is already used in a primary identifier 解决PowerDesigner提示This data item is already used in a primary identifier…

  1.用于存储各种数据类型的变量,支持的数据类型如下: Binary - 用于存储二进制 blob,例如文本文件. Date - 用于存储日期. 此数据类型与 DateTime 类似,只是 Date 不能用于存储时间. DateTime - 用于存储特定日期的特定时间. Flag - 用于存储两个可用值之一,例如 True 或 False. Image - 用于存储图像,例如 BMP.PNG.JPG 和 GIF 文件. Number - 用于存储数值和货币,例如,帐户余额或每月付款的值. Pa…

The present invention relates to the field of security of electronic data and/or communications. In one form, the invention relates to data security and/or privacy in a distributed and/or decentralised network environment. In another form, the invent…

Cross-domain security for data vault is described. At least one database is accessible from a plurality of network domains, each network domain having a domain security level. The at least one database includes at least one partitioned data table tha…

ListView 实现定位特定 item 最近在项目中需要使 ListView 能跳转到特定的 item,查阅文档后,发现 ListView 有以下几种方法可供使用: smoothScrollToPosition(int position):平滑滚动到指定位置.如果 position 为负,则滚动到第一条:如果 position 大于 ListView item 的最大值,则滚动到最后一条. smoothScrollByOffset(int offset):平滑滚动偏移量 offset 指定的…

Optimizing Performance: Data Binding .NET Framework 4.5 Other Versions   Windows Presentation Foundation (WPF) data binding provides a simple and consistent way for applications to present and interact with data. Elements can be bound to data from a…

Abstract – In many practical data mining applications such as web page classification, unlabeled training examples are readily available but labeled ones are fairly expensive to obtain. Therefore, semi-supervised learning algorithms such as co-traini…