Spring Data Mongo Query to query with multiple fields and return in one call

Question

Firstly, the document schema am querying on, is as follows:

{x:10, y:"temp", z:20}

There are multiple other documents in the collection with the same schema as above.

Now, I have a list where each element contains, pair of values belonging to keys x and y. This can be pictured as:

       [{10,"temp"}, {20,"temp1"}, .....] 
keys ->  x    y        x    y

Now, am aware, that if I process the array in a loop and take each pair, I can construct a query like:

query.addCriteria(Criteria.where("x").is(10).and("y").is("temp"))

This will return the document if it matches the AND criteria. I can query with all the pairs in the list in such a manner. But this approach will involve a high number of calls to the data base since for each pair in the list, there is a database call.

To avoid this, Is there any way I can query for all the documents that match this AND criteria for each element in the list, in a single call, using spring data MongoDb Api? Framed differently, I want to avoid looping through the array and making multiple calls, if possible.

charlycou · Accepted Answer · 2019-03-01 10:09:58Z

5

You could use Criteria.orOperator to return each Document that match at least one Criteria of your list.

Build your list of Criteria looping over your list

List<Criteria> criteriaList = new ArrayList<>();
for (item : yourList) {
  criteriaList.add(Criteria.where("x").is(item.x).and("y").is(item.y));
}

Build your query using orOperator:

Query.query(new Criteria.orOperator(criteriaList.toArray(new Criteria[criteriaList.size()])));

edited Mar 1, 2019 at 10:09

answered Mar 1, 2019 at 9:28

charlycou

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