1. PostgreSQL copy of all MySQL created and tested.\n 2. Purchase Orders and Sales Orders and stock level management added to MySQL, PostgreSQL, and server and front end code.

helpers/helper_db_mysql.py

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+"""
+Project:    PARTS Website
+Author:     Edward Middleton-Smith
+            Precision And Research Technology Systems Limited
+
+Technology: Helpers
+Feature:    MySQL Database Helper
+
+Notes: This architecture does not work with Flask-SQLAlchemy - db connection must be initialised with Flask app initialisation
+"""
+
+# internal
+
+# external
+from pydantic import BaseModel, ConfigDict
+from flask import Flask, render_template, jsonify, request,  render_template_string, send_from_directory, redirect, url_for, session
+from flask_sqlalchemy import SQLAlchemy
+
+
+class Helper_DB_MySQL(BaseModel):
+    app: Flask
+
+    model_config = ConfigDict(arbitrary_types_allowed=True)
+
+    def __init__(self, app):
+        super().__init__(app=app)
+        # self.app = app
+
+    def get_db_connection(self):
+        db = SQLAlchemy()
+        db.init_app(self.app)
+        with self.app.app_context():
+            db.create_all()
+            db.engine.url = self.app.config.SQLALCHEMY_DATABASE_URI
+        return db

helpers/helper_db_postgresql.py

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+"""
+Project:    PARTS Website
+Author:     Edward Middleton-Smith
+            Precision And Research Technology Systems Limited
+
+Technology: Helpers
+Feature:    PostgreSQL Database Helper
+"""
+
+# internal
+
+# external
+import psycopg2
+# from psycopg2 import sql
+from pydantic import BaseModel
+from flask import Flask
+
+class Helper_DB_PostgreSQL(BaseModel):
+
+    
+    app: Flask
+
+    def __init__(self, app):
+        super().__init__(app=app)
+        # self.app = app
+
+    def get_db_connection(self):
+        return psycopg2.connect(
+            dbname = self.app.config['DB_NAME'],
+            user = self.app.config['DB_USER'],
+            password = self.app.config['DB_PASSWORD'],
+            host = self.app.config['DB_HOST'],
+            port = self.app.config['DB_PORT']
+        )