This paper presents the principle and operating define of table trigger technique,and on the basis of an example data operation tracking application,discusses the ways to establish the user s operating logs to provide the safety of data operation with table trigger technique in developing VFP application program.

According to the features of the object oriented database and its query,the mark based data operation parallel executing algorithm is proposed,the theoretical analysis and simulation results show that it is an efficient practical algorithm.

Research about data manipulation policy of embedded MPP system;

The Data Manipulation of HyperLink Data Model;

This article introduces the concept of XML data island, discusses the principle of XML data binding and its implementation in web page, gives the methods and scripts of some kinds of data manipulation in client based on XML data island and XML data binding.

Design and implementation of automatic examination paper markingfor database operation;

Database operation is indispensable to a real mechanical CAD system.

Finally give a referenced module of data interoperability technology in distributed CAD system and exemplify it.

This article anatomizes the interoperability method of GIS Geodata which bases on GML,describes from two aspects that the framework and context of spatial data interoperability,illuminates the concrete implementation of WebGIS interoperability and takes the transformation from Shapefile to GML as example,il-luminates that GML-based Geodata Interoperability Method of WebGIS is feasible.