複用ServiceStack OrmLite

Question

JOIN我怎樣才能表達下面的查詢（從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; 

使用OrmLite Select和Join API？

Answer 1

很遺憾，您輯陣表自表連接過於複雜的OrmLite的類型化的API來表達，所以你需要下降到自定義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(); 

我創建了一個Live Example of this you can play with on Gistlyn。