Complex JOIN with ServiceStack OrmLite

Question

How can I express the query below (from this question):

SELECT c.*, p1.*
FROM customer c
JOIN purchase p1 ON (c.id = p1.customer_id)
LEFT OUTER JOIN purchase p2 ON (c.id = p2.customer_id AND 
    (p1.date < p2.date OR p1.date = p2.date AND p1.id < p2.id))
WHERE p2.id IS NULL;

Using OrmLite Select and Join API?

Answer 1

Unfortunately your mutli tables self table join is too complex to be expressed in OrmLite's Typed API so you'll need to drop down to Custom SQL, e.g:

var results = db.Select<Tuple<Customer,Purchase>>(@"SELECT c.*, 0 EOT, p1.*
    FROM customer c
    JOIN purchase p1 ON (c.id = p1.customer_id)
    LEFT OUTER JOIN purchase p2 ON (c.id = p2.customer_id AND 
        (p1.date < p2.date OR p1.date = p2.date AND p1.id < p2.id))
    WHERE p2.id IS NULL;");

results.PrintDump();

I've created a Live Example of this you can play with on Gistlyn.