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mongodb的java开发中无法创建collection是什么原因？

方法是很简单的，就是用类似createCollection("account")来创建，但是mongodb中并没有创建成功，不知道是什么原因？

mongodb的java开发中使用两个字段相等条件查询问题

也就是类似sql中的where 字段A=字段B这样的条件，我查了下网上有些帖子中写的用$where的方式我查询的时候会出错，类似于：new Document("$where",new Document("字段A", "字段B"))，驱动版本是3.0在网上查到了一些资料用法，根据这些方法写了如下代码：...

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更新时间 2023-04-11 09:53:37

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