我在PostgeSQL数据库中有具有以下结构的JSONdata
字段的项(用户):
{
"department": [
"IT"
],
"competencies": [
"moderator",
"language_ru",
"language_en"
]
}
数据库是使用Alchemy访问的
from sqlalchemy.dialects.postgresql import JSON
class UserDBO(db.Model):
__tablename__ = 'user'
id = db.Column(db.BigInteger, primary_key=True)
display_name = db.Column(db.String(length=100), index=True),
email = db.Column(db.String(length=254), index=True)
phone = db.Column(db.String(length=16), index=True)
created = db.Column(db.DateTime)
data = db.Column(JSON, default={}, nullable=False)
我需要选择具有特定能力的用户。 我尝试了以下用于sqlalchemy查询的过滤器(没有一个按预期工作,大多数返回错误):
from sqlalchemy.types import Unicode, String
from sqlalchemy import cast
from sqlalchemy import func
from sqlalchemy.dialects import postgresql
records = UserDBO.query.filter(
# func.json_contains(UserDBO.data['competencies'],cast('moderator', String)),
# UserDBO.data['competencies'].contains({'competencies':['moderator']}),
# UserDBO.data['competencies'].contains('moderator')
# UserDBO.data['competencies'].astext.cast(Unicode) == 'moderator',
# UserDBO.data['competencies'] == ['moderator'],
# ['moderator'] in UserDBO.data['competencies'],
# ['moderator'] in UserDBO.data['competencies'],
# UserDBO.data['competencies'] == cast('moderator', Unicode),
)
我需要选择与若干能力相匹配的项目,如['moderator','language_en'] in UserDBO.data['competencies']
使用一些过滤器(如'moderator' in UserDBO.data['competencies']
为一种能力逐个选择它们也是可以的
通过创建适当的索引来优化这样的查询也是非常有趣的
目前没有回答
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