emongo 介绍
emongo 是另外一个 MongoDB 的 Erlang 开发包，已经多年没更新。
示例代码：
%% find documents where field1 is greater than 5 and less than 10
emongo:find(test, "collection", [{"field1", [{gt, 5}, {lt, 10}]}]).
%% find documents where field1 is greater than or equal to 5 and less than or equal to 10
emongo:find(test, "collection", [{"field1", [{gte, 5}, {lte, 10}]}]).
%% find documents where field1 is greater than 5 and less than 10
emongo:find(test, "collection", [{"field1", [{'>', 5}, {'<', 10}]}]).
%% find documents where field1 is greater than or equal to 5 and less than or equal to 10
emongo:find(test, "collection", [{"field1", [{'>=', 5}, {'=<', 10}]}]).
emongo 官网
https://github.com/jkvor/emongo
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