这是一个将将关系型数据库转换为非关系型数据库的程序，本程序需要定义转换规则，转换规则可以理解为,将关系型数据库的表与表的关系描叙出来多条json数据。 本程序将一个sql类型的数据库中的多张关联表组合为nosql型数据库的一个collection。sql数据的一条由多张表联合后组成的一条数据将转为nosql数据的一条数据。 具体结构如图：

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