> For the complete documentation index, see [llms.txt](https://kb.howsci.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://kb.howsci.com/online-databases/selecting-a-connection-file.md).

# 选择连接文件

在线检索前，必须选择连接文件，连接文件是告诉 EndNote 如何连接行程数据库以及检索选项。选择方法见[检索在线数据库方法](/online-databases/how-to-search-an-online-database.md)中提到的第二步