Mastering MongoDB 4.x - Second Edition

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Doctrine provides a QueryBuilder interface to build queries for MongoDB. Given that we have defined our models as described in Chapter 2, Schema Design and Data Modeling, we can do this to obtain an instance of a QueryBuilder interface named $db, get a default find-all query, and execute it, as follows:

$qb = $dm->createQueryBuilder('Book');$query = $qb->getQuery();$books = $query->execute();

The $books variable now contains an iterable lazy data-loading cursor over our result set.

Using $qb->eagerCursor(true); over the QueryBuilder object will return an eager cursor, fetching all data from MongoDB as soon as we start iterating our results.

Some helper methods for querying are listed here:

• ->getSingleResult(): This is equivalent to ...