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database.py
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database.py
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"""Module with light database class wrapper."""
import os
from pathlib import Path
import polars as pl
class PSQLdb:
"""PostgreSQL database connector class.
Light database class with utility functions for interacting with a
PostgreSQL database.
"""
def __init__(
self,
dbname: str,
user: str = "postgres",
passwd: str = "postgres",
host: str = "localhost",
port: int = 5432,
):
"""Initialize the database connector."""
self.dbname = dbname
self.user = user
self.passwd = passwd
self.host = host
self.port = port
@property
def uri(self) -> str:
"""Return the current URI."""
return f"postgresql://{self.user}:{self.passwd}@{self.host}:{self.port}/{self.dbname}"
def run_query(self, query: list[str] | str) -> pl.DataFrame:
"""Run query from string on the database.
NB: ensure that SQL query is sanitized before entering it
into this function to prevent injection attacks.
"""
return pl.read_database_uri(query=query, uri=self.uri)
def run_sql_file(self, path: str) -> pl.DataFrame:
"""Run query on database from .sql file."""
with Path(path).open("r") as sqlfile:
return self.run_query(sqlfile.read())
class PagilaDB(PSQLdb):
"""Pagila database connection using environment variables."""
def __init__(self):
"""Init the connection to the pagila database."""
super().__init__(
dbname=os.environ.get("DB_NAME", "pagila"),
user=os.environ.get("DB_USER", "postgres"),
passwd=os.environ.get("DB_PASSWD", "postgres"),
host=os.environ.get("DB_HOSTNAME", "localhost"),
port=os.environ.get("DB_PORT", 5432),
)