最近几年来，地理信息系统无论是在理论上还是应用上都处在一个飞速发展的阶段。 GIS被应用于多个领域的建模和决策支持，如城市管理、区划、环境整治等等，地理信息成为信息时代重要的组成部分之一； “数字地球”概念的提出，更进一步推动了作为其技术支撑的GIS的发展。 与此同时，一些学者致力于相关的理论研究，如空间感知、空间数据误差、空间关系的形式化等等。 这恰好说明了地理信息系统作为应用技术和学科的两个方面，并且这两个方面构成了相互促进的发展过程。
Property object ¶
Built-in properties are those that are implemented in ADO and immediately available to any new object, using the MyObject.Property grammar. They will not act as Property object appears in the object’s `` Properties``collection, so although you can change their values, you cannot change their properties.
ADO Property objects represent the dynamic properties of ADO objects, which are defined by the provider defined.
Everyone who talks to ADO provider have different ways to interact with ADO. Therefore, ADO needs to store information about provider in some way. The solution is provider provide specific information (dynamic properties) for ADO. ADO put each provider property is stored in a Property object, while the Property object is also stored in the Properties in the assembly. This collection will be assigned to the Command object, Connection object, Field object or Recordset object.
For example, a property assigned to a provider might indicate Attribute Description Attributes Returns the properties of a Property object Name Sets or returns the name of a Property object Type Returns the type of Property Value Sets or returns the value of a Property object Recordset``object supports transactions or updates. These additional properties will be used as ``Property object appears in the Recordset object’s Properties in the assembly.ProgID ¶
set objProperty=Server.CreateObject("ADODB.property")
Attribute ¶