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PowerDesigner概念模型详解

环境PowerDesigner12.5WindowsXP中文版一、概念模型的重要性PowerDeigner是最强大、最优秀的数据建模工具，是Sybase公司最伟大的产品。目前最新版本是12.5，从9一直用到现在，对PD的认识也是在逐步加深。常常在工作中，看到大家用PD，都是用来建几个表，实际上是做PDM，上来就干这个，实际上，这么用PD，是对强悍的PD一种侮辱。PD仅仅是这么玩的吗？数据库设计的步骤是什么，难道上来稍稍想一下就搞个pdm出来？下面简单回顾下

系统 2019-08-29 21:59:18 3103

数据库相关

uva 10051 Tower of Cubes(DAG最长路）

题目连接：10051-TowerofCubes题目大意：有n个正方体，从序号1~n，对应的每个立方体的6个面分别有它的颜色（用数字给出），现在想要将立方体堆成塔，并且上面的立方体的序号要小于下面立方体的序号，相邻的面颜色必须相同。输出最高值和路径。解题思路：因为立方体可以旋转，所以一个序号的立方体对应这6种不同的摆放方式，可以将问题理解成DAG最长路问题，只是搜索范围是从i+1开始到n。然后记录路径要开两个2维数组。路径不唯一，随便输出一条。#includ

系统 2019-08-12 01:55:00 3103

Ubuntu

Ubuntu14.04LST 安装Oracle SQL Developer 4.0.

1：OracleSQLDeveloper4.0.2下载链接：http://www.oracle.com/technetwork/developer-tools/sql-developer/downloads/index.html2：下载的文件为sqldeveloper-4.0.2.15.21-1.noarch.rpm,rpm安装包不能直接在Ubuntu系统上安装，需要使用alien将rpm转换为deb进行安装。$sudoalien-k--scriptssq

系统 2019-08-12 01:53:43 3103

Tomcat

tomcat配置数据源

1.修改conf下的context.xml，在标签中添加：1 系统 2019-08-12 01:32:45 3103

数据库相关

[SQL]啊?!查询分析器的BUG?!

当我们用SQLServer的查询分析器察看一张表时，竟然看到了这样的记录：奇怪之处就在于“ReceiveTime”字段明明是datetime类型，怎么可能是“62016004”这个数字呢？SQLServer怎么会让这种数字插入呢？即使我们的程序写错了，想往记录里插，那也会得到异常的呀？还是做数据仓库的有经验，说可能是查询分析器的BUG。用VBScript写了一个查询的例子，把这条记录的每一个字段报告出来，果然！结论：确实是微软的查询分析器算错了，实际上数据

系统 2019-08-12 01:32:32 3103

Python

python安装mysql的依赖包mysql-python

一般情况下，使用pip命令安装即可：[root@dthost27~]#pipinstallmysql-python但是在实际工作环境中，往往会安装失败，这是因为系统缺少mysql的相关依赖组件。所以必须先安装mysql-devel类的包，而且必须要对应好mysql客户端的版本，即要安装好：[root@dthost27~]#rpm-ivhmysql-community-libs-5.7.23-1.el6.x86_64.rpmmysql-community-c

系统 2019-09-27 17:50:54 3102

Python

python读取大文件越来越慢的原因与解决

背景：今天同事写代码，用python读取一个四五百兆的文件，然后做一串逻辑上很直观的处理。结果处理了一天还没有出来结果。问题出在哪里呢？解决：1.同事打印了在不同时间点的时间，在需要的地方插入如下代码:printtime.strftime('%Y-%m-%d%H:%M:%S',time.localtime(time.time()))发现一个规律，执行速度到后面时间越来越长，也就是处理速度越来越慢。2.为什么会越来越慢呢？1）可能原因1，GC的问题，有篇文章

系统 2019-09-27 17:48:26 3102

编程技术

垣克大战

本面使用jquery-1.3.2和面定位map.jsp,支持一人和双人游戏,实现如下:山寨坦克大战...主坦克方向:WASD,空格发射</span> <p class="auth-span"> <span class="muted"><i class="fa fa-user"></i><span class="zj-icon-text">系统</span></span> <span class="muted"><i class="fa fa-clock-o"></i><span class="zj-icon-text">2019-08-29 23:48:09</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3102</span></span>  </p> </article><article class="excerpt"> <header> <a title="编程技术" class="label label-important zj-del-target" href="/category/30">编程技术<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/17923" title="WEB2.0标准教程：第十一天不用表格的菜单" target="_blank" onclick="return recordId('',)">WEB2.0标准教程：第十一天不用表格的菜单 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/17923" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/15.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/17923';}else{window.open('/article/17923');}" style="cursor: pointer;">布局初步搭建起来，我开始填充里面的内容。首先是定义logo图片：样式表：#logo{MARGIN:0px;padding:0px;WIDTH:200px;HEIGHT:80px;}页面代码：<divid="logo"><atitle="WEB2.0标准教程循序渐进十二天的基础学习！"href="http://www.yzci.com/"><imgheight="80"alt="WEB2.0标准教程"src="logo.gif"width="200"/></</span> <p class="auth-span"> <span class="muted"><i class="fa fa-user"></i><span class="zj-icon-text">系统</span></span> <span class="muted"><i class="fa fa-clock-o"></i><span class="zj-icon-text">2019-08-29 22:59:45</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3102</span></span>  </p> </article><article class="excerpt"> <header> <a title="编程技术" class="label label-important zj-del-target" href="/category/30">编程技术<i class="label-arrow"></i></a> <h2> <a class="zj-titles zj-del-target" href="/article/16731" title="揭露人性丑恶的五大心理实验" target="_blank" onclick="return recordId('',)">揭露人性丑恶的五大心理实验 </a> </h2> </header> <div class="focus"> <a class="zj-del-target" href="/article/16731" target="_blank"><img style="width: 200px; height: 123px;" class="thumb" src="/Public/static/images/article/4.jpg" alt="" title=""></a> </div> <span class="note" onclick="if (jq.browser.versions.mobile) {window.location.href='/article/16731';}else{window.open('/article/16731');}" style="cursor: pointer;">作者：AlexandraGedrose来源：Cracked.com心理学家认为，当你触及他人思想的时候必须格外小心，因为你永远也无法肯定你将会发现些什么。多年以来，就这一课题的大量心理实验已经得出了惊人的结论。请注意，我们所要讨论的对象并不是那些间歇性精神病患者；事实上，我们所说的正是您。以下这些实验的结果将不言自明：实验五、阿希的从众实验（1953年）实验步骤：心理学者阿什(SolomonAsch)曾作了一系列用以验证从众效应的研究，其实验结果可令所有读</span> <p class="auth-span"> <span class="muted"><i class="fa fa-user"></i><span class="zj-icon-text">系统</span></span> <span class="muted"><i class="fa fa-clock-o"></i><span class="zj-icon-text">2019-08-29 22:44:57</span></span> <span class="muted"><i class="fa fa-eye"></i><span class="zj-icon-text">3102</span></span>  </p> </article><div class="pagination" style="display:;"> 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