PC SOFT

WINDEV的在线文档

  • Overview
  • Creating a CDM
文档页面当前正在翻译。对于此延迟我们深表歉意。
您可以自愿地帮助我们翻译您想要的文档段落,然后只需通过以下地址与我们联系:info@cn.windev.com
产品
WinDevWebDev-服务器代码WebDev-浏览器代码WinDev Mobile报表和查询
平台
WindowsLinuxWindows MobileWindows PhoneWindows Store appsAndroidAndroid Widget iPhone/iPad
语言
JavaPHPAjax用户代码(MCU)外部语言
数据库
HFSQLHFSQL Client/Server存储过程HF 5.5OLE DBODBC本地访问

Overview
In the MERISE methodology, the conceptual data model defines the objects and the actions that must be taken into account in the database. This model only represents the structures of information and the exchanges of information for the system used, independently of the physical constraints linked to the nature of the database used.

For example, a simplified invoicing system can be described as follows:

  • A customer corresponds to a customer name, to a customer company and to a customer address.
  • An order corresponds to an order number, to an order date, to an order amount and to a list of products ordered.
  • A customer can "place" an order at a given date.

Creating a CDM
To create a CDM:
  1. Select "File .. New .. Data .. Analysis (CDM)". The wizard for creating a CDM starts.Clickamong the quick access buttons:
    • In the wheel that is displayed, click "Data" and select "Analysis (CDM)".The window for creating a new element is displayed: click "Data" then "Analysis (CDM)".
    • The wizard for creating a CDM starts.
  2. Specify:
    • the name and directory of the CDM. The CDM corresponds to a ".MCD" file. By default, this file will be created in the directory of the project analysis (<Project name>.ANA directory). This directory must be accessible in read/write.
    • the caption of the CDM by briefly describing the purpose of the CDM.
    • whether the CDM must be directly associated with an analysis. This analysis can be an existing analysis or a new analysis that will be created.
  3. The created CDM becomes the current CDM. You can now create the first entity.
  4. Create all the elements (entities, associations, properties and relationships) of your CDM.