时态数据库技术在水文信息服务中的应用研究

Research and Application of Temporal Database in Hydrological Information Service

水文信息中存在着大量的历史数据和随时间变化的实时数据,时态特性显著。该文结合水文信息服务的实际应用特点,在关系数据库基础上,设计基于视图的水文时态数据模型;为时态数据模型的实现设计了时态处理中间层,把前端的时态SQL语句的解析成底层关系数据库系统能够识别的标准SQL语句,从而实现水文数据的各种时态处理。重点对水文时态查询、水文时态聚集方面进行了深入研究,并给出了实例测试,实现了水文时态数据库的应用。

There are a lot of history data and time-varying real data in hydrological information,the temporal characteristics are very signifi cant.Combing with specific application of hydrological,the paper proposes hydrologic temporal data management program and hydrologic temporal model basing on relation database system.Design the middle layer to achieve the hydrologic temporal model.It can parse tempo ral SQL to standard SQL that the relational database can identify and process.It especially considers achieving the temporal query,temporal aggregation and gives specific examples.It achieves hydrological applications of temporal database.