PonyORM非常有趣.
Pony可以将PythonGenerators翻译成SQL.
它拥有可视编辑器和模型等其他特性.
FreeforNon-commercialusewithpaidcommerciallicenses.
语法：
select(c for c in Customer if sum(c.orders.price) > 1000)翻译成SQL后的效果：
SELECT "c"."id"FROM "Customer" "c" LEFT JOIN "Order" "order-1" ON "c"."id" = "order-1"."customer"GROUP BY "c"."id"HAVING coalesce(SUM("order-1"."total_price"), 0) > 1000
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