Dynamically setting __tablename__ for sharding in SQLAlchemy?

Question

In order to handle a growing database table, we are sharding on table name. So we could have database tables that are named like this:

table_md5one
table_md5         


        

Answer 1

you can write a function with tablename parameter and send back the class with setting appropriate attributes.

def get_class(table_name):

   class GenericTable(Base):

       __tablename__ = table_name

       ID= Column(types.Integer, primary_key=True)
       def funcation(self):
        ......
   return GenericTable

Then you can create a table using:

get_class("test").__table__.create(bind=engine)  # See sqlachemy.engine