create db functions script for postgresql

sql/dbfunctions.py

@@ -0,0 +1,40 @@
+# DB Functions for PostgreSQL
+# install pip3 install psycopg2
+from dotenv import load_dotenv
+import os
+import psycopg2
+import pandas as pd
+
+# load enviromental variables
+load_dotenv()
+
+# Create a connection to database
+def connectDatabase():
+    conn = psycopg2.connect(
+        host=os.getenv('DBHOST'),
+        database=os.getenv('DBNAME'),
+        user=os.getenv('DBUSER'),
+        password=os.getenv('DBPASSWORD'),
+        port=os.getenv('DBPORT'),)
+    conn.autocommit = True
+    cursor = conn.cursor()
+    return cursor
+
+def executeQuery(query):
+    conn = connectDatabase()
+    conn.execute(query)
+    result = conn.fetchall()
+    return result
+
+def executeWithoutFetch(query):
+    conn = connectDatabase()
+    conn.execute(query)
+    return None
+
+def loadTable(query):
+    conn = connectDatabase()
+    conn.execute(query)
+    result = conn.fetchall()
+    colnames = [desc[0] for desc in conn.description]
+    df = pd.DataFrame(result, columns=colnames)
+    return df