Multi-source data query method and system

The invention provides a multi-source data query method and system, and belongs to the field of database. The multi-source data query method includes the steps that a data access request of service application is received and forwarded to a data access assembly, and the data access assembly judges pass parameters in the access request; when the judgment result indicates that data access is a cross-database data request, the data access request is forwarded to a distributed data query engine; a multi-data source corresponding to the data access request is connected, and a query result corresponding to the data access request is obtained from the multi-data source and forwarded to the data access assembly, so that a data forwarding assembly directly transmits the query result to the serviceapplication. By building a logic database, direction connection between the service application and the database is isolated, and therefore data access safety is improved; abstract development serviceis provided, and data man