MongoDB在查找特定文档? [英] MongoDB finding a speciffic document?

问题描述

由于大多数教程已经过时，而且我的MongoDB版本(最新版本)没有BasicDBObject，因此我正在努力查找特定文档.

I'm struggling to find a specific document, as most tutorials are outdated, and my MongoDB version (the latest) does not have BasicDBObject.

我正在使用BSON，这是我的尝试，

I'm using BSON, here is my attempt,

    public Document getPlayer(UUID uuid) {
    Document toFind = new Document("id", uuid);
    MongoCursor<Document> c = players.find(toFind).iterator();
    while (c.hasNext()) {
        if (toFind.equals(c)) {
            return c;
        }
    }

    return null;
}

我完全知道这是错误的，但是我只是不知道如何在MongoDB上找到任何信息.

I'm fully aware this is wrong, but I just do not know how to find any information on MongoDB.

推荐答案

查看对于普通查询，请使用Filters实用工具类

For normal queries, use the Filters utility class

players.find(Filters.eq("id", id))

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注释后当我在这个答案上发现一个绿色的钩子时，我想您已经解决了，但是:请确保在您的项目中包括正确的驱动程序版本.具体来说，您需要3.x系列的驱动程序才能使用更现代的界面.

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Edit after comment: as I find a green hook on this answer, I guess you already solved it, but nevertheless: make sure, that you include the correct driver version in your project. Specifically, you need a driver of the 3.x series to use the more modern interface.

当前的maven依赖项是:

The current maven dependency is:

<dependency>
    <groupId>org.mongodb</groupId>
    <artifactId>mongo-java-driver</artifactId>
    <version>3.9.1</version>
</dependency>

完全合格的

Filters实际上是com.mongodb.client.model.Filters.

Filters fully qualified is actually com.mongodb.client.model.Filters.

这篇关于MongoDB在查找特定文档?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！