An important role of ADT in a database application is expounded.A method in the paper enables database to access data of ADT, in which an array, a blob stream and a blob field are discussed.

• 阐述了ADT类型的数据在数据库应用过程中的重要性，提供了为数据库增加存取ADT数据功能的方法和手段，介绍了二进制流和二进制字段在存取ADT数据时的作用。