I wrote a small tool git-graph.py over the weekend which can be used to generate the object graph of a Git repository. The primary purpose is to help Git learners better understand the Git data model through visualization. You can experiment with var…

HBase Data Model--HBase 数据模型(翻译) 在HBase中,数据是存储在有行有列的表格中.这是与关系型数据库重复的术语,并不是有用的类比.相反,HBase可以被认为是一个多维度的映射. HBase数据模型术语 Table(表格) 一个HBase表格由多行组成. Row(行) HBase中的行里面包含一个key和一个或者多个包含值的列.行按照行的key字母顺序存储在表格中.因为这个原因,行的key的设计就显得非常重要.数据的存储目标是相近的数据存储到一起.一个常用的行的key…

参考资料:http://www.cnblogs.com/hggc/archive/2013/10/15/3369857.html 由于有把ER图转Excel的需求,幸运地找到一个可用脚本,稍做修改完成需求 1. 环境 Windows 7+PowerDesigner 15.0.0.2613 2. 执行 1)打开需求转化的pdm文件 2)按下ctrl+shift+x 3)在输入范围内添加脚本内容并执行 '************************************************…

A Model represents some object that your application manages. For example, one might define a Model for Users, Products, Cars, or any other real-world object that we want to model in the system. Models are registered via the model manager, and are us…

http://blog.csdn.net/wangyongxia921/article/details/42061695 一.EnityFramework EnityFramework的全程是ADO.NET Entity Framework .和Nhibernate一样,EF 同样是遵守ORM的思想,利用了抽象化数据结构的方式,将每个数据库对象都转换成应用程序对象 (entity),而数据字段都转换为属性 (property),关系则转换为结合属性 (association),让数据库的 E/R…

1. 新建一个项目,添加一个ADO.NET Entity Data Model的文件,此文件会生成所有的数据对象模型,如果是用vs2012生的话,在.Designer.cs里会出现“// Default code generation is disabled for model 'C:\Work\Project\20140303\Delete\Model1.edmx'. // To enable default code generation, change the value of the '…

http://www.entityframeworktutorial.net/EntityFramework5/create-dbcontext-in-entity-framework5.aspx 官网的教程https://msdn.microsoft.com/en-us/data/jj206878 Here, we are going to create an Entity Data Model (EDM) for SchoolDB database and understand the ba…

Instead of add todo as a string, we create a data model: export class TodoModel{ constructor( public title: string = "" ){} } export class TodoService{ todos: TodoModel[] = [ new TodoModel('eat'), new TodoModel('sleep'), new TodoModel('work') ];…

One of the first issues you will likely encounter when getting started with ASP.NET Identity centers on customizing the underlying data model. The Entity Framework provider uses Code-First to generate the data model and, initially, it may seem as if…

1. Physical Data Model 2. SQL Statements drop database MessageReceiver go /*==============================================================*/ /* Database: MessageReceiver */ /*==============================================================*/ create dat…