Design and Implementation of Relation Database and Non-Relation Database Unified Query Model

摘要

For scenarios that application data stored separately in relational database and non-relational database, an establishment of a unified query abstraction layer for SQL and NoSQL database is proposed, which can query data from different database as from a single data source. By transforming NoSQL data into triples to merge the NoSQL data as a virtual relational into SQL database and the original NoSQL data is rebuilt by series of self-join operations of the triples. For scenes that PostgreSQL and MongoDB are used simultaneously, the above model is implemented and verified. Experimental results show that through an intermediate triple conversion and a series of self-join of the triples, a unified query abstraction model for SQL and NoSQL database is feasible.