一种支持动态?XML?文档的存储模式设计与应用

针对XRel模式无法有效支持动态XML文档存储的问题,在区间编码的基础上,引入向量方法提出一种支持XML文档动态更新的编码方案——NewDietz,设计可以存储NewDietz编码元素的关系模式,并给出新元素在关系模式下的更新方法。新模式既保证新元素的有效存储,又兼顾动态XML文档从该模式中重组需要对元素进行祖先-后裔判断的问题。为验证新模式的实际应用效果,开发一个水利空间数据存储与展示模块,并对空间数据分别采用2种存储模式进行验证。对比结果表明,新模式明显提升XML文档在关系数据库中的存储效率,并有效支持XML文档的动态更新,为基于XML的水利业务数据在关系数据库中的高效存储提供一种可能。

Application in XML Relational Storage Based on Data Update

Aiming at the problem of XRel mode which cannot effectively support dynamic XML documents storage, based on interval coding the article develops a new encoding method-NewDietz in which the vector methodology is employed to improve the interval encoding mode in dynamic updating for XML document, designs a relational storage schema to store with NewDietz encoding element, and gives updating methodology for new elements. The new schema insures both the effective storage of new elements and ancestor-descent connections in reconstructing XML document. In order to verify the practical application effect of the new mode, a module for water resources spatial data storage is developed and all spatial data sets are encoded with two storage schema. Results suggest that the new XML storage schema evidently improve the effificiency of relational storage and dynamic updating of XML document compared to the XRel mode, which provides a possibility mode for the effificient storage for XML based water business data.