Research On Query Interface Technologies To Relational Databases

As the traditional storage technique, relational database has played important role in database area for a long time. For the past few years, database based question answering has been widely applied in transportation, biomedical engineering, intelligent city, etc. As we all know that the value of data lies in being used by the public. Research on query interface technologies to relational databases has gained much attention from researchers. This technology has high practical value.This paper proposes a schema-free based graph query constructing method. A convenient graphic UI is the important aspect of a query interface.Traditional relational database based query methods have some drawbacks, such as the fuzziness and low precision of keyword query. On the other hand, natural language is difficult to be understood by computer and has poor practicability. Moreover, executing SQL may make the online query time out of control. This thesis proposes a user-friendly query interface based on relational database. Common users can construct graph queries using their own words. Specially, our main contents are as follows.1. Design a query interface for common users, who can create graph query using their own words.2. Study the existing sub-graph matching algorithms and provide a similarity computing method. Conduct a heuristic top-k sub-graph search algorithm.3. Design and implement a query system for common user. Conduct some experiments to test and verify the effectiveness of our approach.