如何使用子查询和语句进行Realm查询

Question

I'm now working Realm with java, I have no idea how can I use subquery.

I have two RealmObjects like below.

public class Sms extends RealmObject {
    @PrimaryKey
    private String id;
    private String address;
}
public class Statement extends RealmObject {
    @PrimaryKey
    private String id;
    private String smsId;
}

And I want query with Realm to do same work like sql below.

SELECT
    *
FROM
    sms
WHERE
    id not in (
        SELECT
            sms_id
        FROM
            statement
    )
    and address = "123456789"
;

How can I achieve it?

---

Update 2015-12-18 :

@geisshirt, many thanks for answer kindly.

I had a idea from his answer, and below is result.

RealmResults<Statement> statements = realm.where(Statement.class).findAll();
RealmQuery<Sms> query = realm.where(Sms.class).equalTo("address", "123456789");
for(Statement statement : statements){
    query = query.notEqualTo("id", statement.getSmsId());
}
RealmResults<Sms> smsList = query.findAll();

I think this will achieve my goal, but I'm doubtful about this is the only way to achieve not in or in statement.

Is there noway to do this more clearly?

Answer 1

With your current model, you will have to iterate:

RealmResults<Statement> statements = realm.where(Statement.class).equalTo("address", "123456789").findAll();
for(Statement statement : statements) {
    RealmResults<Sms> sms = realm.where(Sms.class).notEqualTo("id", statement.smsId).findAll();
    // do something to sms
}

I'm not sure what the query really means: did you mean id in instead of id not in ?