On 6/18/14, 8:31 PM, Vineet Goel wrote:
Hi,
I am trying to convert the following SQL to SQLAlchemy:
|SELECT teams.department, teams.team,
IF(employee_managers.team_id IS NOT NULL, employee_managers.manager,
teams.default_manager) AS manager
FROM teams
LEFT JOIN employee_managers ON employee_managers.team_id = teams.id
WHERE teams.department = 'hr' and (employee_managers.name = 'vineet' OR
employee_managers.name IS NULL)|
the SQL standard version of IF is CASE, SQLAlchemy supports CASE
directly see
http://docs.sqlalchemy.org/en/rel_0_9/core/sqlelement.html?highlight=case#sqlalchemy.sql.expression.case
where my models look like this:
|class EmployeeTeam(db.Model):
__tablename__ = 'teams'
id = db.Column(db.Integer, primary_key=True)
name = db.Column(db.String(140), nullable=False)
department = db.Column(db.String(140), nullable=False)
team = db.Column(db.String(140), nullable=False)
default_manager = db.Column(db.String(140), nullable=False)
class EmployeeManagers(db.Model):
__tablename__ = 'employee_managers'
id = db.Column(db.Integer, primary_key=True)
name = db.Column(db.String(140), nullable=False)
team_id = db.Column(db.Integer, db.ForeignKey('teams.id'))
team = db.relationship('EmployeeTeam')
manager = db.Column(db.String(140), nullable=False)|
After hours of googling, I found some func.IF kind of stuff but they
all keep giving me an OperationalError: (OperationalError) (1248,
'Every derived table must have its own alias').
Does anyone know a simple way to convert this SQL to SQLAlchemy?
Any help would be much appreciated.
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