From the Tutorial and other documentation sources, you learned how to create business classes for your XAF applications. If you have business classes in your application, you have database tables in the application's database. However, the reality is…
In this lesson, you will learn how to implement business classes from scratch. For this purpose, the Department and Position business classes will be implemented. These classes will be used in the Contact class, implemented previously. You will also…
When developing an XAF application, you may be required to rename a persistent class or property due to refactoring specifics or changed business requirements. An XAF application launched in debug mode automatically creates required tables and column…
In this lesson, you will learn how to implement business classes from scratch. For this purpose, the Position business class will be implemented. This class will be used in the Contact class, implemented previously. You will also learn the basics of…
In this lesson, you will learn how to implement business classes for your application using the Business Class Library. This library contains the most typical ready-to-use business classes. You will implement a custom Contact class by deriving from t…
While developing a page with multiple scrolls levels, and especially when using a grid, you may get the error Data being added conflicts with existing data. (18,2). This suggests a problem with the key structures in the tables in your lower scroll le…
问题描述:执行下面的代码,报错valueError: This solver needs samples of at least 2 classes in the data, but the data contains only one class: 0 原因:数据量太少 解决方案:增加训练数据量 代码如下: filename = "test.csv" data = pd.read_csv(filename,sep=' ') data = pd.DataFrame(data) x =…
How to: Create a Business Model in the XPO Data Model Designer This topic provides step-by-step instructions on how to use the XPO Data Model Designer in XAF applications. We will create a simple business model consisting of two objects - Employee an…
This topic provides step-by-step instructions on how to use the XPO Data Model Designer in XAF applications. We will create a simple business model consisting of two objects - Employee and Task. These objects will be linked with a one-to-many relatio…
Note This section is split into two parts, which describe the use of two different Object-relational mapping (ORM) 请注意本节分为两个部分,它们描述了两个不同对象关系映射(ORM)的使用 tools: Entity Framework (EF) and eXpress Persistent Objects (XPO) 工具:EF和XPO . You will start by cho…
With XAF, you can build new applications from scratch or maintain existing databases. The How to: Generate XPO Business Classes for Existing Data Tables topic describes how to use the design-time wizard that generates business classes for one or more…
Applications built with the eXpressApp Framework are comprised of several functional blocks. The diagram below shows the basic blocks, indicates when and how these blocks are created and last, shows you the areas where you can extend your application…
http://www.cnblogs.com/cmzcheng/archive/2011/11/20/2255806.html —————————————————————————————————————————————————————————————————— 1. JBPM简介 JBPM,全称是Java Business Process Management(业务流程管理),它是覆盖了业务流程管理.工作流.服务协作等领域的一个开源的.灵活的.易扩展的基于java实现的流程业务处理 框架(Bu…
