基于数据监听算法的异构地籍数据网上提取技术及实现

Data monitoring algorithm design and implementation of heterogeneous cadastre

从分布异构的地籍数据库提取数据,实现国家地籍数据总归户。传统方法是通过在数据库中创建对象,但无法保证地籍数据的安全。本次研究中采用基于文件的数据监听算法以及编制相应的中间件,通过监听数据库文件的大小、属性、最后一次更改时间,在确定文件在某一时间是否更改的情况下启动监听,调用底层的IO接口。中间件是一个与数据库平台无关的客户端程序,采用事件触发机制,实现了定时/实时远程地籍系统之间的数据交换。

Land resource management need to gain the cadastre data from the distributed and heterogeneous database. To prove the safety ofcadastre data, it can not build the object in database. Data monitoring algorithm is designed to monitor the size, attribute and last changed time. The algorithm is started by file changed states. The algorithm calls I/O API and active rule, to solve the time or realtinae monitoring of cadastre data. The client program based on midware technology. It can gain the cadastre data from the distributed and heterogeneous database.