该模块中的重要函数有：连接数据库的函数、查询数据库的函数以及提供查询结果的函数。
Important functions in this module are connecting to a database, querying the database, and giving out results of the query.
该模块中的重要函数有：连接数据库的函数、查询数据库的函数以及提供查询结果的函数。
Important functions in this module are connecting to a database, querying the database, and giving out results of the query.
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