Find data

Before retrieving data, you must connect to the database and obtain a collection.

Let's assume we have the following class:

class User(
    val name: String,
    val age: Int,
)

To return all documents in a collection, we can use find:

collection.find()
    .toList()
    .forEach { println(" - $it") }

To only return specific documents, we can add a filter expression:

// Find all users who have a name and who are older than 18
collection.find {
    User::name.isNotNull()
    User::age gt 18
}.toList()
    .forEach { println(" - $it") }

If we know that only one user may exist, we can use findOne instead:

collection.findOne { User::name eq "Sylvain De La Fontaine" }