qixinbo
54 lines
1.8 KiB
Python
54 lines
1.8 KiB
Python
from sqlalchemy import create_engine, text
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from sqlalchemy.orm import sessionmaker
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from typing import Generator
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import os
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class PostgresConnector:
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def __init__(self, db_url: str = None):
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self.db_url = db_url or os.getenv("POSTGRES_URL", "postgresql://user:password@localhost:5432/dbname")
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self.engine = create_engine(self.db_url)
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self.SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=self.engine)
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def get_db(self) -> Generator:
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db = self.SessionLocal()
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try:
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yield db
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finally:
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db.close()
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def execute_query(self, query: str):
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with self.engine.connect() as connection:
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result = connection.execute(text(query))
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return [dict(row._mapping) for row in result]
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def get_schema(self):
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query = """
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SELECT table_name, column_name, data_type
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FROM information_schema.columns
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WHERE table_schema = 'public'
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ORDER BY table_name, ordinal_position;
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"""
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try:
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results = self.execute_query(query)
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schema = {}
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for row in results:
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table = row['table_name']
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if table not in schema:
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schema[table] = []
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schema[table].append(f"{row['column_name']} ({row['data_type']})")
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return schema
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except Exception as e:
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print(f"Error getting schema: {e}")
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return {}
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def test_connection(self) -> bool:
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try:
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with self.engine.connect() as connection:
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connection.execute(text("SELECT 1"))
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return True
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except Exception as e:
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print(f"PostgreSQL Connection Error: {e}")
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return False
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postgres_connector = PostgresConnector()
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