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。
ADO summary ¶
Overview of ADO ¶
This tutorial has shown you how to access data in a database from a Web site.
You have learned how to display data from a database on a Web site and how to edit, add, and delete data through ADO.
For more information about ADO, please refer to our ADO instance.
You have learned ADO, what’s the next step? ¶
The next step is to learn SQL.
SQL is a standard computer language for accessing and operating database systems.
The SQL statement is used to retrieve and update data in the database. SQL can work with these database systems: MS Access, DB2, Informix, MS SQL Server, Oracle, Sybase, and others.
If you need to learn more about SQL, please visit our SQL tutorial.