查询之间的mongo jpa

Question

I'm using spring jpa to integrate with a mongo database. I've got a simple mongo document with an Instance field. In my repository I've tried something like

findByInstantBetween(Instant start, Instant end, Pageable pageable);

I've got a simple spring unit test (run with spring runner and a normal spring context) that looks like this:

import static org.assertj.core.api.Assertions.assertThat;

...


@Test
public void testSearchByInstantBetween() {
    // insert a document before the date range to test, should not be retrieved by query
    MyDocument doc = new MyDocument();
    doc.setInstant(Instant.now());
    doc= docRepository.insert(doc);

    // insert a document with the start instant, should be retrieved
    doc.setId(null);
    Instant start = Instant.now();
    doc.setInstant(start);
    doc = docRepository.insert(doc);

    // insert a document with the end instant, should be retrieved
    doc.setId(null);
    Instant end = Instant.now();
    doc.setInstant(end);
    doc = docRepository.insert(doc);

    // insert a document after the end instant, should not be retrieved
    doc.setId(null);
    doc.setInstant(Instant.now());
    doc = docRepository.insert(doc);

    // check that 4 documents have been inserted
    assertThat(docRepository.findAll()).hasSize(4);

    Pageable pageable = PageRequest.of(0, 5);

    // run between query, expected size is 2
    Page<MyDocument> docs = docRepository.findByInstantBetween(start, end, pageable);
    assertThat(docs.getContent()).hasSize(2); // <-- this fails with expected 2, found 0
}

I've also tried to change the query method as follows

findByInstantGreaterThanEqualAndInstantLessThanEqual(Instant start, Instant end, Pageable pageable);

And when I run the test with this method I get

org.springframework.data.mongodb.InvalidMongoDbApiUsageException: Due to limitations of the com.mongodb.BasicDocument, you can't add a second 'instant' expression specified as 'instant: Document{{$lte=2019-10-15T06:28:43.508Z}}'. Criteria already contains 'instant : Document{{$gte=2019-10-15T06:28:43.505Z}}'.

Has anyone had this kind of problem?

Answer 1

The Between query method was working correctly. I didn't know it was exclusive, so since I only had a test case with two elements ( start and end Instant s respectively) the query looked between (not including) those and found 0 elements.

When I added another element with an Instant in the middle of start and end , I expected 3 but it returned 1.

In order to make the query inclusive I annotated it as follows

@org.springframework.data.mongodb.repository.Query("{ instant: {$gte: ?0, $lte: ?1}}")

where ?0 and ?1 correspond with the start and end parameters respectively.

Hopefully this can help someone else.

Answer 2

Use below example query for finding something with greater or equal and less than or equal.

@Query("{instant : {$gte : ?0, $lte : ?1}}")
 findUsingQ(Instant start, Instant end, Pageable pageable);