support multiple databases #26
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support multiple metadatas and engines support flask-sqlalchemy-lite support plain sqlalchemy
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Support Flask-SQLAlchemy-Lite and plain SQLAlchemy, in addition to Flask-SQLAlchemy. Add
metadatasandenginesparams to theAlembicinit. For Flask-SQLAlchemy-Lite, onlymetadatasmust be passed,db.enginesis used automatically. For SQLAlchemy,metadatasandenginesmust be passed. For Flask-SQLAlchemy,db.metadataanddb.enginesare used automatically.Support multiple databases, and multiple metadata per database. More than one metadata object can be passed to
metadatas. A dict maps names to one or more metadatas. Corresponding engines must also be configured. If multiple databases are configured, Alembic'smultidbtemplate will be used.