X-Post on stackoverflow: <http://stackoverflow.com/posts/31307677>
I use SQLAlchemy with Python3 and sqlite3.
I tried to `add()` and new object into a sqlite database and got this
error message.
sqlalchemy.exc.InterfaceError: (sqlite3.InterfaceError)
Error binding parameter 3 - probably unsupported type.
SQL: 'INSERT INTO "TrainingUnit"
(oid, "order", date, level, sets, repetitions, machine)
VALUES (?, ?, ?, ?, ?, ?, ?)']
[parameters: (6, 0, '2014-12-12', Decimal('75'), None, None, 1)]
I understand that "parameter 3" means the fourth one because the
counting begins with 0. I think the problem here is the `Decimal()`. I
don't understand why SQLAlchemy add this here? What is this
'Decimal()'? Is it Python, SQL, ...?
The scheme itself is generated automaticly from SQLA with that statement
CREATE TABLE "TrainingUnit" (
oid INTEGER NOT NULL,
"order" INTEGER,
date DATE,
level INTEGER,
sets INTEGER,
repetitions INTEGER,
machine INTEGER,
PRIMARY KEY (oid),
FOREIGN KEY(machine) REFERENCES "Machine" (oid)
)
...out of that SQLAlchemy/Python class definition
class TrainingUnit(_Base):
__tablename__ = 'TrainingUnit'
_oid = sa.Column('oid', sa.Integer, primary_key=True)
_order = sa.Column('order', sa.Integer)
_date = sa.Column('date', sa.Date)
_level = sa.Column('level', sa.Integer)
_sets = sa.Column('sets', sa.Integer)
_repetitions = sa.Column('repetitions', sa.Integer)
_machine_fk = sa.Column('machine', sa.Integer,
sa.ForeignKey('Machine.oid')) _machine = sao.relationship("Machine")
...
This is a part of the `add()` using code. It copy/convert "objects"
from a PostgreSQL database to a SQLite database using SQLAlchemy. This
worked fine for two other tables.
pstr = 'postgres://puser@localhost/' + dbname
sstr = 'sqlite:///' + dbname + '.db'
pengine = sa.create_engine(pstr, echo = False)
sengine = sa.create_engine(sstr, echo = True)
# create and open the SQLite database
create_database(sengine.url)
mod._Base.metadata.create_all(sengine)
ssession = sao.sessionmaker(bind = sengine)()
# open the PostgreSQL database
psession = sao.sessionmaker(bind = pengine)()
# ...
# TrainingUnit
for t in psession.query(mod.TrainingUnit).all():
sas.make_transient(t)
ssession.add(t)
ssession.commit()
psession.close()
ssession.close()
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