对于上下文,我想查询一些具有以下效果的东西:
select point '(1,1)' <@ box '((0,0),(2,2))';
我尝试过这样的事情:
CREATE TABLE tbl (latlng POINT NOT NULL);
box = [[22.268764039073968, -140.09765625000003], [61.438767493682825, -56.42578125000001]]
await pool.fetch(f'SELECT * FROM tbl WHERE latlng <@ $1;', box)
然后我尝试了此:
from asyncpg.types import Point, Box
v = [[22.268764039073968,-140.09765625000003],[61.438767493682825,-56.42578125000001]]
box = Box(Point(v[0][0], v[0][1]), Point(v[1][0], v[1][1]))
await pool.fetch(f'SELECT * FROM tbl WHERE latlng <@ $1;', box)
两次尝试均导致错误:
asyncpg.exceptions.AmbiguousFunctionError: operator is not unique: point <@ unknown
HINT: Could not choose a best candidate operator. You might need to add explicit type casts.
[我猜我必须手动使asyncpg使用box_encode()作为此参数(因为任何表定义都没有暗示它,但是我如何告诉asyncpg做到这一点?
(重复上面猫王评论中给出的答案,所以我可以将问题标记为已解决)
解决方案是在arg之后添加::box
,如下所示:
box = [[22.268764039073968, -140.09765625000003], [61.438767493682825, -56.42578125000001]]
await pool.fetch(f'SELECT * FROM tbl WHERE latlng <@ $1::box;', box)