By far the easiest approach is to modify the username you're coming into Oracle
as so that the schema in question is the default. Or if you can, create Oracle
synonyms (i.e. CREATE SYNONYM) in the default schema that link to the
schema-qualified tables.
Otherwise SQLA doesn't have a lot of ability to change the schema name. The
tometadata() approach you've used is the best it has, however you'd need to
declare all new classes against those Table objects. A recipe for doing this
is here: http://www.sqlalchemy.org/trac/wiki/UsageRecipes/EntityName.
Another way you might do it is to put an event handler that modifies all the
SQL to replace a particular schema name with something else, or nothing, like
s/someschema./someotherschema./ type of thing. You can do this with the
before_execute or before_cursor_execute events:
engine = create_engine(...)
@event.listens_for(engine, before_cursor_execute, retval=True)
def replace_schema(conn, cursor, statement,
parameters, context, executemany):
statement = statement.sub(someschema., )
return statement, parameters
On Jun 6, 2012, at 3:51 PM, Shawn Wheatley wrote:
Hi,
I'm trying to use my declarative models to copy data from an Oracle database
with a non-default schema name to a SQLite database (which has no schema
name, or at least a default name that can't be changed). Copying from Oracle
to Oracle has not been a problem for me, but Oracle to SQLite will not work.
The problem for me is that the schema definition used for SQL generation is
on the table. I went through a fruitless exercise of calling tometadata on
every table in the metadata created by the generated declarative base class,
copying into a new MetaData object. I then swapped the metadata on the
declarative base and ran my query, with the intention of swapping it back
after. No luck.
The purpose of my project is to surgically extract related data for a small
subset of accounts from our production database and bring it down to a local
SQLite database. Does anybody have experience doing this? Am I going about
this the wrong way?
Thanks for any help,
Shawn
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