Python sqlalchemy 高级用法

一. 关联查询

sys_user_list = SysPermission.query.join(OrgRolePermission, OrgRolePermission.sys_permission_id == SysPermission.id).filter(OrgRolePermission.role_name == user_cache["role"]).all()

二. 过滤查询

from sqlalchemy import not_
sys_list = SysPermission.query.filter(not_(SysPermission.type == 1))

三. and, or, in查询

from sqlalchemy import and_, or_
sys_user_list = SysPermission.query.filter(and_(SysPermission.type == 2, SysPermission.type == 3)).all()
sys_user_list = SysPermission.query.filter(or_(SysPermission.type == 2, SysPermission.type == 3)).all()
live_hls_video = LiveHlVideos.query.filter(LiveHlVideos.live_hl_id.in_(live_hls_list)).all()    # live_hls_list: [1,2,3]

四. func

from sqlalchemy import func
question_types = db.session.query(MoocBankQuestion.question_type, func.sum(MoocBankQuestion.points_possible), func.count(MoocBankQuestion.question_type)).filter(
            MoocBankQuestion.mooc_bank_id == mooc_bank_id).group_by(MoocBankQuestion.question_type).all()