SQLAlchemy JSON列-如何执行包含查询 [英] SQLAlchemy JSON column - how to perform a contains query
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问题描述
我在mysql(5.7.12)中具有下表:
I have the following table in mysql(5.7.12):
class Story(db.Model):
sections_ids = Column(JSON, nullable=False, default=[])
sections_ids 基本上是整数[1、2,...,n]的列表.我需要获取sections_ids包含X的所有行.我尝试了以下方法:
sections_ids is basicly a list of integers [1, 2, ...,n]. I need to get all rows where sections_ids contains X. I tried the following:
stories = session.query(Story).filter(
X in Story.sections_ids
).all()
但是它抛出:
NotImplementedError: Operator 'contains' is not supported on this expression
推荐答案
使用在顶层搜索数组时,不需要给出 path .或者,从8.0.17开始,您可以使用 value MEMBER OF(json_array)
,但在我看来,在SQLAlchemy中使用它的人机工程学要少一些:
As you're searching an array at the top level, you do not need to give path. Alternatively beginning from 8.0.17 you can use value MEMBER OF(json_array)
, but using it in SQLAlchemy is a little less ergonomic in my opinion:
from sqlalchemy import literal
# self_group forces generation of parenthesis that the syntax requires
session.query(Story).filter(literal(X).bool_op('MEMBER OF')(Story.section_ids.self_group())).all()
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