MongoDB查询构造函数采用原始查询字符串Java [英] Mongodb query constructor to take raw query string Java

问题描述

我正在尝试提出一个概念，以获取查询字符串，并通过查询对象将其传递给类似这样的内容:

I am trying to come up with a concept to take a query string and have it passed into something like this via a query object:

returnList = mongoTemplateTracking.find(query,TrackingData.class, COLLECTION_NAME);

我一直在查询Query和Criteria类的构造函数，以查看它们是否可以采用原始字符串，例如:

I've been looking at the constructors of both the Query and Criteria classes to see if they could take a raw string such as:

 "ID" : "32399a"

而不是通过Criteria.where().is()等来建立Criteria对象.

Instead of building up the Criteria object via Criteria.where().is() etc..

我已经看到了方法

protected <T> List<T> doFind(String collectionName,
                 com.mongodb.DBObject query,
                 com.mongodb.DBObject fields,
                 Class<T> entityClass)

但是，当我将mongoTemplateTracking自动装配到类中时，无法访问此方法.

However as I am autowiring the mongoTemplateTracking into my class I cannot access this method.

推荐答案

MongoDB查询语言("MQL")易于以JSON形式表示.因此，如果您有一个字符串表达式，例如:

MongoDB query language ("MQL") is easily expressed in JSON form. So if you have a string expression like:

String s = "{\"$or\": [ {\"name\": \"buzz\"}, {\"age\": {\"$lt\": 20 }} ] }";

然后您可以使用此实用工具轻松解析它:

then you can easily parse it with this util:

import com.mongodb.util.JSON;
DBObject query = (DBObject) JSON.parse(s);
yourCollection.find(query);

看看

Take a look at In Java, is there a way to write a string literal without having to escape quotes? to make the escaping of quotes in long query expressions a little easier.

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