Apache Doris is a high-performance real-time analytical database that supports multiple methods for connecting to external data sources. Among these, JDBC Catalog is a key feature that enables Doris to integrate with various mainstream databases, facilitating federated analysis and data migration. 

This article provides a detailed guide on how Doris connects to multiple databases via JDBC Catalog, lists the supported database types, and outlines the usage instructions to help users get started quickly.