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中文摘要：
针对传统的关系型数据模型（E/R模型）存在有数据类型单一、无法体现数据间实际联系和没有继承概念等问题,将面向对象技术融入到现有的关系数据模型中重新构建数据库。将整个大坝安全监控系统（DSMS）划分为三个模块,并重新绘制各部分的模型概念图并给出数据模型的定义。最后,利用重新构建的数据库开发完成新的大坝安全监控系统,经Loadrunner的性能测试后与传统关系模型为基础的系统相比较,其性能更为优越。
英文摘要：
Since traditional E/R model has some problems such as a single type of data,not reflecting the actual relationship between data,having no concept of inheritance and other issues,the object-oriented technology should be brought into existing relational data model to rebuild the data base.The entire dam safety monitoring system（DSMS）is divided into three modules,conceptual graph is redrawn in each part and the definition of the data model is given.Finally,the use of reconstructed database complete the new dam safety monitoring system,after a comparison between the results of performance testing for the new system and the traditional relational model-based system.The performance of the new one is superior.
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