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') ];…

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…

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…

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…