hm, pardon me, not sure what do you want to achieve. is it something like 
this?
e.g.
## Use SQLite
db0 = DAL('sqlite://testmultipledb.sqlite')

## Use MySQL
db1 = DAL('mysql://root:@localhost/testmultipledb')

## Use PostgreSQL
db2 = DAL('postgres://postgres:a@localhost/testmultipledb')

db0.define_table('person', Field('name'), format='%(name)s')
db1.define_table('person', Field('name'), format='%(name)s')
db2.define_table('person', Field('name'), format='%(name)s')

db0.person.insert(name="Alex")
db1.person.insert(name="BAlex")
db2.person.insert(name="CAlex")

row0 = db0().select(db0.person.ALL).first()
row1 = db1().select(db1.person.ALL).first()
row2 = db2().select(db2.person.ALL).first()

best regards,
stifan

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