摘要
为解决全局查询无法直接查询异构数据源问题,提出将全局查询分解为针对异构数据源子查询的解决方案。设计面向多数据源异构数据的全局查询分解算法和子查询重构算法。全局查询分解算法基于JavaCC及JJTree工具将全局查询语句抽象成语法树。子查询重构算法遍历语法树,根据节点类型采用不同的重构算法,构造出针对不同类型数据源的子查询语句。
In order to solve the problem that global query can not query heterogeneous data sources,this paper proposes to decompose the global query into sub-queries against heterogeneous data.It designs query decomposition and subquery reconstruction algorithm.Query decomposition is based on JavaCC and JJTree to abstract the global query into a syntax tree.Subquery reconstruction algorithm traversals the syntax tree,chooses different reconstruction algorithms based on the current node type,and constructs the sunquery based on different datasource.
出处
《计算机工程》
CAS
CSCD
北大核心
2010年第23期56-58,共3页
Computer Engineering
基金
天津市科技支撑计划基金资助项目"基于数据服务的数据集成平台研发"(08ZCKFGX00700)
关键词
数据集成
查询分解
子查询重构
data integration
query decomposition
subquery reconstruction
