Thanks for the swift reply, Mike! Unfortunately, I had some trouble running
your code. I'm getting
base = automap_base(MetaData())
File "/usr/local/lib/python2.7/dist-packages/sqlalchemy/ext/automap.py",
line 848, in automap_base
Base.__name__,
AttributeError: 'MetaData' object has no attribute '__name__'
For some reason the class name doesn't seem to be parsing?
Perhaps a related issue, I run into
File
"/usr/local/lib/python2.7/dist-packages/sqlalchemy/dialects/mysql/mysqldb.py",
line 73, in _escape_identifier
value = value.replace(self.escape_quote, self.escape_to_quote)
AttributeError: 'NoneType' object has no attribute 'replace'
when I try
base = automap_base()
base.prepare(engine, reflect=True)
however,
base.prepare(engine, reflect=True, schema='report_rahuja')
with the schema specified works just fine, which is what initially led me
to believe that the base/engine require a schema.
Any insight would be much appreciated.
On Monday, September 19, 2016 at 8:09:29 PM UTC-7, Mike Bayer wrote:
>
>
>
> On 09/19/2016 08:43 PM, Rahul Ahuja wrote:
> > Currently, I'm instantiating a new engine and declarative automap base
> > for each MySQL database I'd like to include in my session and then
> > individually
> > mapping reflected tables to the relevant engines. Some sample code to
> > clarify:
> >
> > |
> > report_engine = create_engine(URL(drivername='mysql',
> > host='prod-mysql-analytics-master.box', port='3306',
> > query={'read_default_file':'/srv/db.cnf'}, database='report'))
> > report_base = automap_base()
> > report_base.prepare(report_engine, reflect=True)
> >
> > md_engine = create_engine(URL(drivername='mysql',
> > host='prod-mysql-analytics-master.box', port='3306',
> > query={'read_default_file':'/srv/db.cnf'}, database='md'))
> > md_base = automap_base()
> > md_base.prepare(md_engine, reflect=True)
>
>
> you can connect to no specific database and schema qualify the tables
> instead:
>
>
> engine = create_engine("mysql://user:pass@host/")
> base = automap_base(MetaData())
>
> base.metadata.reflect(engine, schema="report")
> base.metadata.reflect(engine, schema="md")
>
> my_base.prepare()
>
>
> >
> > This seems like a hack-ish approach so I'm wondering if there's a better
> > way. Must a separate engine and base be created for each MySQL DB?
>
> nope
>
> Each
> > DB resides on the same MySQL instance with the same host name. And must
> > each table be explicitly bound in the session creation?
>
> definitely not. The SQLA docs hardly talk about "bound metadata"
> anywhere and I don't know where people continue to get the impression
> they need to do this.
>
> Still learning
> > the ropes of SQLAlchemy so forgive me if these are obvious questions.
> > Thanks for your time!
> >
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