First build

backend/app/connectors/postgres.py

@@ -0,0 +1,53 @@
+from sqlalchemy import create_engine, text
+from sqlalchemy.orm import sessionmaker
+from typing import Generator
+import os
+
+class PostgresConnector:
+    def __init__(self, db_url: str = None):
+        self.db_url = db_url or os.getenv("POSTGRES_URL", "postgresql://user:password@localhost:5432/dbname")
+        self.engine = create_engine(self.db_url)
+        self.SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=self.engine)
+
+    def get_db(self) -> Generator:
+        db = self.SessionLocal()
+        try:
+            yield db
+        finally:
+            db.close()
+
+    def execute_query(self, query: str):
+        with self.engine.connect() as connection:
+            result = connection.execute(text(query))
+            return [dict(row._mapping) for row in result]
+
+    def get_schema(self):
+        query = """
+        SELECT table_name, column_name, data_type
+        FROM information_schema.columns
+        WHERE table_schema = 'public'
+        ORDER BY table_name, ordinal_position;
+        """
+        try:
+            results = self.execute_query(query)
+            schema = {}
+            for row in results:
+                table = row['table_name']
+                if table not in schema:
+                    schema[table] = []
+                schema[table].append(f"{row['column_name']} ({row['data_type']})")
+            return schema
+        except Exception as e:
+            print(f"Error getting schema: {e}")
+            return {}
+
+    def test_connection(self) -> bool:
+        try:
+            with self.engine.connect() as connection:
+                connection.execute(text("SELECT 1"))
+            return True
+        except Exception as e:
+            print(f"PostgreSQL Connection Error: {e}")
+            return False
+
+postgres_connector = PostgresConnector()