删除数据库组件(该操作还会删除相关的链接)，然后添加现有的数据库(DB2)组件并重新建立如图21所示的链接。

Delete the Database component (this action will also remove the associated link), add the Existing Database (DB2) component and re-establish the link as shown in Figure 21.

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本文采用了基于规则的知识表示方法，并采用了关系型数据库建立本系统的知识库，知识库具有添加、删除等功能，实现规则的增加及重复规则的删除。

The structure of knowledge base is build by the database of relational data model. In order to add rules and delete reduplicate rules, knowledge base has the function of addition, deletion and so on.

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