Query Of Oil And Gas Heterogeneous Database And Retrieval Of Oil And Gas Document Based On Metadata

Oil and gas resources are important energy source in China.Our government sector has collected and sorted out a lot of valuable data in the field of oil and gas,and these data are scattered in the heterogeneous databases.However,with the increase of the databases and the continuous updating of the data,there is a lot of inconvenience in the query and management.Therefore,a new approach is needed to solve the problem of unified management of data in the field of oil and gas.Metadata is a very effective way to ensure that all kinds of contents are found,so this thesis presents a metadata-based method for oil and gas heterogeneous databases query and oil and gas document retrieval.This method collects the metadata of structured data such as databases,data tables,data fields and unstructured data such as document and pictures,then establishes a unified metadata database.For the structured data,the integrated query is achieved by mapping between entities and metadata in each oil and gas database.For unstructured data,since its metadata can be used as the index of its fulltext retrieval,this thesis proposes and implements the method of automatic indexing based on metadata in full text retrieval.In the face of large amounts of documents,this method has greatly improved the efficiency of creating indexes.The real-time and flexibility of this integration method is strong,and it is simple to achieve.Based on actual project,this thesis designs and implements a unified management system of oil and gas resources data through this method,which plays a very good effect in practical engineering applications.