# README
使用时需要删除 go.mod 中的replace语句 修改.env.example文件为.env，并且修改其中的mongo信息为你的
# Functions
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FilterBsonM 函数接受原始 bson.M 数据和要保留的字段列表， 返回一个新的 bson.M 只包含指定的字段。 示例 keepFields := []string{"name", "email"}.
查找多条数据 [start].
查找一条数据 [start].
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GetInstance 返回 Database 类的单例实例.
判断bson.M中的键值是否存在.
InsertOne 插入一条数据 [start].
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mapToBsonD 将 map[string]interface{} 转换为 bson.D，键按字典序排序.
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ParseSortString 将形如 "field1=1,field2=-1" 的字符串转换为 bson.M 映射.
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updateOne 更新数据 [start].