Utilities for using PostgreSQL COPY with SQLAlchemy
Project description
sqlalchemy-postgres-copy is a utility library that wraps the PostgreSQL COPY command for use with SQLAlchemy. The COPY command offers performant exports from PostgreSQL to TSV, CSV, or binary files, as well as imports from files to PostgresSQL tables. Using COPY is typically much more efficient than importing and exporting data using Python.
Installation
pip install -U sqlalchemy-postgres-copy
Usage
import postgres_copy from models import Album, session, engine # Export a CSV containing all Queen albums query = session.query(Album).filter_by(artist='Queen') with open('/path/to/file.csv', 'w') as fp: postgres_copy.copy_from(query, fp, engine, format='csv', header=True) # Import a tab-delimited file with open('/path/to/file.tsv') as fp: postgres_copy.copy_to(fp, Album, engine)
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