Hooking entity creation in SQLAlchemy

Posted by Dan Ellis on Stack Overflow See other posts from Stack Overflow or by Dan Ellis
Published on 2010-05-24T07:27:11Z Indexed on 2010/05/24 7:31 UTC
Read the original article Hit count: 223

Filed under:

sqlalchemy

I want to write a SessionExtension that fires a 'Foo-created' event or 'Bar-created' event every time a new Foo or new Bar is committed to the database. However, once inside the after_commit method, I don't know where to find which entities have been committed. Where do I get this information?

Related posts about sqlalchemy

sqlalchemy date type in 0.6 migration using mssql

as seen on Stack Overflow - Search for 'Stack Overflow'
I'm connection to mssql server through pyodbc, via FreeTDS odbc driver, on linux ubuntu 10.04. Sqlalchemy 0.5 uses DATETIME for sqlalchemy.Date() fields. Now Sqlalchemy 0.6 uses DATE, but sql server 2000 doesn't have a DATE type. How can I make DATETIME be the default for sqlalchemy.Date() on sqlalchemy… >>> More
OperationalError "unable to open database file" processing query results with SQLAlchemy and SQLite3

as seen on Stack Overflow - Search for 'Stack Overflow'
I'm running into this little problem that I hope is just a dumb user error. It looks like some sort of a size limit with a query to a SQLite database. I managed to reproduce the issue with an in-memory DB and a simple script shown below. I can make it work by either reducing the number of records… >>> More
Starter question of declarative style SQLAlchemy relation()

as seen on Stack Overflow - Search for 'Stack Overflow'
I am quite new to SQLAlchemy, or even database programming, maybe my question is too simple. Now I have two class/table: class User(Base): __tablename__ = 'users' id = Column(Integer, primary_key=True) name = Column(String(40)) ... class Computer(Base): __tablename__ = 'comps' … >>> More
Default class for SQLAlchemy single table inheritance

as seen on Stack Overflow - Search for 'Stack Overflow'
I've set up a single table inheritance, but I need a "default" class to use when an unknown polymorphic identity is encountered. The database is not in my control and so the data can be pretty much anything. A working example setup: import sqlalchemy as sa from sqlalchemy import orm engine = sa… >>> More
Batch select with SQLAlchemy

as seen on Stack Overflow - Search for 'Stack Overflow'
I have a large set of values V, some of which are likely to exist in a table T. I would like to insert into the table those which are not yet inserted. So far I have the code: for value in values: s = self.conn.execute(mytable.__table__.select(mytable.value == value)).first() … >>> More

Developer IT

Hooking entity creation in SQLAlchemy - Developer IT

Hooking entity creation in SQLAlchemy

sqlalchemy

Related posts about sqlalchemy

sqlalchemy date type in 0.6 migration using mssql

OperationalError "unable to open database file" processing query results with SQLAlchemy and SQLite3

Starter question of declarative style SQLAlchemy relation()

Default class for SQLAlchemy single table inheritance

Batch select with SQLAlchemy

Categories cloud