PB中关于数据窗口的两个问题

PowerBuilder是美国著名的数据库应用开发工具生产商Sybase公司的产品,而数据窗口是PowerBuilder的核心技术和专利产品,学好PowerBuilder关键是要掌握数据窗口技术.作者就数据窗口连接数据库的三种方法及获得和修改数据窗口对象中属性和数据的方法做了总结与阐述.     

PowerBuilder数据窗口技术的查询方法分析

数据窗口技术是PowerBuilder的核心技术之一,数据窗口的强大功能以及PowerBuilder对SQL语言的良好支持,使得用户可以方便灵活的对数据库进行检索和操作.基于数据窗口技术的查询方法有很多,本文主要讨论三种易行的查询方法,并针对其各自优缺点加以分析.     

Pb8.0中数据窗口行选择的应用技巧

PowerBuilder是大家公认的、最佳的数据库前端开发工具之一,数据窗口(Datawindow)是PowerBuilder中的关键技术,也是sybase的专利技术之一。笔者在开发数据库管理信息系统中,需要在数据窗口控件中选取(高亮显示)多行记录,如下图中所示,     

基于PowerBuilder前端的SQL Server网络数据库开发（二）

PowerBuilder与SQL Server的数据通信方式有四种:采用PowerBuilder提供的数据窗口(Data Window);采用Power-Builder提供的PowerScript语言;采用SQL Server提供的存储过程;用C、Visual Basic等语言调用API函数。 1.采用PowerBuilder提供的数据窗口来提取SQLServer表中的数据。 数据窗口是PowerBuilder中的一个对象,它是一个数据操纵平台。它根据用户要求自动生成一组嵌入式SQL语句,从SQL Server数据库的表中提取数据,以用户设定的表     

Power Builder数据窗口诮用及示例

数据窗口（DataWindow）是PowerBuilder中功能丰富的对象,是用户与数据库打交道的窗口。通过数据窗口,用户可以方便地完成数据库的录入、查询。更新等操作。数据窗口可通过数据窗口画笔完成,然而1个设计好的数据窗日,有时不一定满足用户的需要。如：在数据库查询中,...     

基于PowerBuilder数据窗口的查询方法研究

数据窗口是PowerBuilder的专利。技术，对数据库中信息的操作、显示、查询、报表都可以通过它进行。主要研究基于数据窗口函数查询的多种方法及应用，并设计了基于数据窗口的多关系组合查询方法。     

PowerBuilder中父子窗口数据一致性编程

数据窗口是PowerBuilder的专利技术，在访问数据库和数据处理方面具有很强的功能，子数据窗口是一个与父数据窗口相连的数据窗口对象。本文以一个实例来说明如何在父窗口中连接子窗口，并且当父窗口数据改变时，子窗口数据亦随之改变，使父子窗口数据达到一致性。     

在PB数据窗口中实现数据的灵活编程

PowerBuilder是Powersoft公司推出的基于客户机/服务器体系结构的强有力的数据库应用程序开发工具.为了在PowerBuilder中实现对数据窗口对象中的数据进行灵活编程处理,文中提出了三种不同的编程方案,分别是在PB提供的事件中编程方法、结合系统函数和数据窗口控件编程方法、采用自定义函数法结合数据窗口控件方法.结合一个工程实例,对三种方案各自的特点进行了分析和比较.在实际的应用过程中,结合不同的情况,灵活使用上述方法,可以提高编程效率和系统运行效率.     

PowerBuilder中利用WORD编辑数据库中的大文本

在PowerBuilder中,大文本数据属于BLOB类型.PowerBuilder本身可以处理数据库中的大文本,但Power-Builder的多行编辑器的能力较弱.由于PowerBuilder支持WINDOWS具备的对象连接与嵌入(OLE)功能,因此,如果在PowerBuilder中利用WORD这个专用的编辑软件来编辑处理数据库中的大文本,然后再将处理好的内容存回数据库中,则可达到事半功倍的效果.具体实现步骤如下:1.创建—自由格式的数据窗口.由于在数据窗口中只有主键列才能唯一地标识一行数据,从而唯一地找到此行     

PowerBuilder应用的性能优化策略

本文从数据库设计、数据窗口、数据统计等方面对PowerBuilder应用程序设计的性能优化方法进行了详细阐述.     

Only connect: teaching, technology and telesis

Abstract This paper describes an approach to the design of interactive multimedia materials being developed in a European Community project. The developmental process is seen as a dialogue between technologists and teachers. This dialogue is often problematic because of the differences in training, experience and culture between them. Conditions needed for fruitful dialogue are described and the generic model for learning design used in the project is explained.     

European Community policy and the market

Abstract This paper starts with some reflections on the policy considerations and priorities which are shaping European Commission (EC) research programmes. Then it attempts to position the current projects which seek to capitalise on information and communications technologies for learning in relation to these priorities and the apparent realities of the marketplace. It concludes that while there are grounds to be optimistic about the contribution EC programmes can make to the efficiency and standard of education and training, they are still too technology driven.     

一种自适应子融合集成多分类器方法

融合集成方法已经广泛应用在模式识别领域,然而一些基分类器实时性能稳定性较差,导致多分类器融合性能差,针对上述问题本文提出了一种新的基于多分类器的子融合集成分类器系统。该方法考虑在度量层融合层次之上通过对各类基多分类器进行动态选择,票数最多的类别作为融合系统中对特征向量识别的类别,构成一种新的自适应子融合集成分类器方法。实验表明,该方法比传统的分类器以及分类融合方法识别准确率明显更高,具有更好的鲁棒性。     

Avoiding semantic and temporal gaps in developing software intensive systems

Development of software intensive systems (systems) in practice involves a series of self-contained phases for the lifecycle of a system. Semantic and temporal gaps, which occur among phases and among developer disciplines within and across phases, hinder the ongoing development of a system because of the interdependencies among phases and among disciplines. Such gaps are magnified among systems that are developed at different times by different development teams, which may limit reuse of artifacts of systems development and interoperability among the systems. This article discusses such gaps and a systems development process for avoiding them.     

Designing economic np control charts: A programmed simulation approach

This paper presents control charts models and the necessary simulation software for the location of economic values of the control parameters. The simulation program is written in FORTRAN, requires only 10K of main storage, and can run on most mini and micro computers. Two models are presented - one describes the process when it is operating at full capacity and the other when the process is operating under capacity. The models allow the product quality to deteriorate to a further level before an existing out-of-control state is detected, and they can also be used in situations where no prior knowledge exists of the out-of-control causes and the resulting proportion defectives.     

The development of robot art

Going through a few examples of robot artists who are recognized worldwide, we try to analyze the deepest meaning of what is called “robot art” and the related art field definition. We also try to highlight its well-marked borders, such as kinetic sculptures, kinetic art, cyber art, and cyberpunk. A brief excursion into the importance of the context, the message, and its semiotics is also provided, case by case, together with a few hints on the history of this discipline in the light of an artistic perspective. Therefore, the aim of this article is to try to summarize the main characteristics that might classify robot art as a unique and innovative discipline, and to track down some of the principles by which a robotic artifact can or cannot be considered an art piece in terms of social, cultural, and strictly artistic interest. This work was presented in part at the 13th International Symposium on Artificial Life and Robotics, Oita, Japan, January 31–February 2, 2008     

煤矿井下安全监控分站的设计及其仿真实现

为了设计一种具有低成本、低功耗、易操作、功能强且可靠性高的煤矿井下安全分站,针对煤矿安全生产实际,文章提出了采用MCS-51系列单片机为核心、具有CAN总线通信接口的煤矿井下安全监控分站的设计方案;首先给出煤矿井下安全监控分站的整体构架设计,然后着重阐述模拟量输入信号处理系统的设计过程,最后说明单片机最小系统及其键盘、显示、报警、通信等各个组成部分的设计;为验证设计方案的可行性与有效性,使用Proteus软件对设计内容进行仿真验证,设计的煤矿井下安全监控分站具有瓦斯、温度等模拟量参数超标报警功能和电机开停、风门开闭等开关量指示功能;仿真结果表明:设计的煤矿井下安全监控分站具有一定的实际应用价值.     

Explanation and prediction: an architecture for default and abductive reasoning

Although there are many arguments that logic is an appropriate tool for artificial intelligence, there has been a perceived problem with the monotonicity of classical logic. This paper elaborates on the idea that reasoning should be viewed as theory formation where logic tells us the consequences of our assumptions. The two activities of predicting what is expected to be true and explaining observations are considered in a simple theory formation framework. Properties of each activity are discussed, along with a number of proposals as to what should be predicted or accepted as reasonable explanations. An architecture is proposed to combine explanation and prediction into one coherent framework. Algorithms used to implement the system as well as examples from a running implementation are given.     

Three Process Perspectives: Organizations, Teams, and People

This paper provides the author's personal views and perspectives on software process improvement. Starting with his first work on technology assessment in IBM over 20 years ago, Watts Humphrey describes the process improvement work he has been directly involved in. This includes the development of the early process assessment methods, the original design of the CMM, and the introduction of the Personal Software Process (PSP)^SM and Team Software Process (TSP){^SM}. In addition to describing the original motivation for this work, the author also reviews many of the problems he and his associates encountered and why they solved them the way they did. He also comments on the outstanding issues and likely directions for future work. Finally, this work has built on the experiences and contributions of many people. Mr. Humphrey only describes work that he was personally involved in and he names many of the key contributors. However, so many people have been involved in this work that a full list of the important participants would be impractical.     

基于复小波噪声方差显著修正的SAR图像去噪

提出了一种基于复小波域统计建模与噪声方差估计显著性修正相结合的合成孔径雷达(Synthetic Aperture Radar,SAR)图像斑点噪声滤波方法。该方法首先通过对数变换将乘性噪声模型转化为加性噪声模型,然后对变换后的图像进行双树复小波变换(Dualtree Complex Wavelet Transform,DCWT),并对复数小波系数的统计分布进行建模。在此先验分布的基础上,通过运用贝叶斯估计方法从含噪系数中恢复原始系数,达到滤除噪声的目的。实验结果表明该方法在去除噪声的同时保留了图像的细节信息,取得了很好的降噪效果。