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    • 3. 发明申请
    • Converting recursive hierarchical data to relational data
    • 将递归分层数据转换为关系数据
    • US20070143321A1
    • 2007-06-21
    • US11303432
    • 2005-12-16
    • Dikran MeliksetianGeorge MihailaSriram PadmanabhanNianjun Zhou
    • Dikran MeliksetianGeorge MihailaSriram PadmanabhanNianjun Zhou
    • G06F7/00
    • G06F16/86
    • A system and method of converting a recursive XML document into a relational schema comprises providing a recursive XML document; parsing an external mapping script specifying a mapping from the recursive XML document to a relational table format; building a recursive shredding tree based on the external mapping script and the relational table format; and shredding the mapped recursive XML document into a relational table. The system and method further comprise detecting whether any of a XML schema and a DTD document is recursive, wherein the detecting comprises building a directed graph comprising element names; corresponding elements names as nodes in the directed graph; forming arcs from every element parent node to every element child node of the element parent node; and checking for cycles in the directed graph. The system and method further comprise identifying all recursive cursor nodes and a recursive degree corresponding to the recursive shredding tree.
    • 将递归XML文档转换为关系模式的系统和方法包括提供递归XML文档; 解析指定从递归XML文档到关系表格式的映射的外部映射脚本; 基于外部映射脚本和关系表格式构建递归切割树; 并将映射的递归XML文档切割成关系表。 所述系统和方法还包括检测XML模式和DTD文档中的任何一个是递归的,其中所述检测包括构建包括元素名称的有向图; 相应的元素名称作为有向图中的节点; 从每个元素父节点到元素父节点的每个元素子节点形成弧; 并检查有向图中的周期。 该系统和方法还包括识别所有递归光标节点和对应于递归粉碎树的递归度。
    • 9. 发明申请
    • Query-driven partial materialization of relational-to-hierarchical mappings
    • 查询驱动的关系到层次映射的部分实现
    • US20050198055A1
    • 2005-09-08
    • US10795534
    • 2004-03-08
    • George MihailaSriram PadmanabhanOded Shmueli
    • George MihailaSriram PadmanabhanOded Shmueli
    • G06F17/00
    • G06F17/30932Y10S707/99931Y10S707/99943Y10S707/99945Y10S707/99953
    • Techniques are provided for automatically rewriting a relational-to-hierarchical mapping into one or more modified mappings. In this way, clients that prefer or require different portions of the mapping-defined data are supported. For example, in one aspect of the invention, a technique for modifying a relational-to-hierarchical mapping in accordance with at least one user query includes the following steps/operations. At least one query associated with a query language that supports a hierarchical data structure is obtained. Further, at least one relational-to-hierarchical mapping for use in translating data associated with a relational data structure into data associated with the hierarchical data structure is obtained. Then, the at least one relational-to-hierarchical mapping is modified based on the at least one query such that data specifically relevant to the at least one query may be generated in accordance with the modified relational-to-hierarchical mapping.
    • 提供了用于将关系到分层映射自动重写成一个或多个修改的映射的技术。 以这种方式,支持偏好或需要映射定义数据的不同部分的客户端。 例如,在本发明的一个方面,根据至少一个用户查询修改关系到分层映射的技术包括以下步骤/操作。 获得与支持分层数据结构的查询语言相关联的至少一个查询。 此外,获得用于将与关系数据结构相关联的数据转换成与分层数据结构相关联的数据的至少一个关系到分层映射。 然后,基于至少一个查询来修改至少一个关系到分层映射,使得可以根据修改的关系到分层映射生成与至少一个查询特别相关的数据。