any2any: see files in
http://dbcook.svn.sourceforge.net/viewvc/dbcook/trunk/dbcook/misc/metadata/
copyall, copydata
i haven't touched it for a while, see if still works.
On Thursday 12 February 2009 01:05:47 Piotr Ozarowski wrote:
> Hi,
>
> Here's what I wrote to create PostgreSQL's data backup in SQLite:
> (yes, I know pg_dump, I just want to create/use it in SQLAlchemy)
>
> | new_engine = sqlalchemy.create_engine("sqlite:///offline.db")
> | metadata.create_all(bind=new_engine)
> |
> | # SQLite doesn't care about foreign keys much so we can just copy
> | the data for table in metadata.sorted_tables:
> | if table.name == 'posters':
> | continue # see below
> | data = table.select(bind=session.bind).execute().fetchall()
> | if data:
> | table.insert(bind=new_engine).execute(data)
> |
> | # posters table - "data" column is BLOB!
> | for poster in
> | metadata.tables['posters'].select(bind=session.bind).execute():
> | metadata.tables['posters'].insert(bind=new_engine).\
> | execute(md5sum=poster.md5sum, data=StringIO(poster.data).read())
>
> (metadata and session are already created in app. and are pointing
> to PostgreSQL's stuff)
>
>
> Questions:
> 1) can it be done nicer? Specially the part with tables containing
> BLOB columns ("posters" in above example)
> 2) is there an easy way to do this the opposite way (from SQLite to
> PostgreSQL)?
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