SQLAlchemy SELECT WITH子句/语句(pgsql)

Question

如何执行在sqlalchemy中使用WITH的SQL查询?

WITH foo AS (...), bar as (...) SELECT (...)

http://www.postgresql.org/docs/9.1/static/queries-with.html

使用postgres。

Answer 1

这段来自SQLAlchemy作者的代码可能会有所帮助

q1 = s.query(distinct(Appl.refid), Appl). 
        filter(Appl.lastname.ilike('Williamson%')). 
        filter(Appl.firstname.ilike('d%')). 
        group_by(Appl). 
        order_by(Appl.refid, Appl.appldate.desc()) 
q1 = q1.cte('distinct_query') 
q2 = s.query(q1).order_by(q1.c.lastname, q1.c.firstname) 
q2.all() 

输出为:

WITH distinct_query AS 
(SELECT DISTINCT appl.refid AS anon_1, appl.id AS id, appl.firstname AS     firstname, appl.lastname AS lastname, appl.refid AS refid, appl.appldate AS appldate 
FROM appl 
WHERE appl.lastname ILIKE %(lastname_1)s AND appl.firstname ILIKE %(firstname_1)s GROUP BY appl.id, appl.firstname, appl.lastname, appl.refid, appl.appldate ORDER BY appl.refid, appl.appldate DESC) 
 SELECT distinct_query.anon_1 AS distinct_query_anon_1, distinct_query.id AS distinct_query_id, distinct_query.firstname AS distinct_query_firstname, distinct_query.lastname AS distinct_query_lastname, distinct_query.refid AS distinct_query_refid, distinct_query.appldate AS distinct_query_appldate 
FROM distinct_query ORDER BY distinct_query.lastname, distinct_query.firstname