【摘要】 每一个复杂的Twig查询都由线性Twig查询构成,有效地处理线性Twig查询显得非常重要。DMXML系统以国产DM5.6关系数据库为平台,融合结构映射和模型映射,实现独特的路径分区编码方案来存储XML数据。在系统中,线性Twig查询解析后,形成线性Twig查询的路径集,而该集合中的每一个路径可被唯一变换为关系数据库中整型主键的范围查询。实验结果显示,路径分区编码方案能加速线性Twig查询,它将为高效实现复杂Twig查询奠定基础。更多还原

【Abstract】 Since every complex Twig query consists of linear ones,it is important to handle linear Twig queries effectively.DM XML system builds on homemade DM5.6,integrates structure mapping and model mapping,and realizes a particular path-partitioned encoding scheme to store XML data.After a linear Twig is analyzed in the system,its path set is generated.Each path in the set is uniquely translated into a range query for integer primary key on RDBMS.The results of experiments indicate path-partitioned encoding scheme speeds linear Twig queries so that it will make an effective way to implement complex twigs.更多还原