Adds support for MySQL port configuration

Introduces a new optional parameter for specifying the MySQL server port, defaulting to 3306.

Updates connection instructions to include port information for both local and remote connections.

Enhances clarity in troubleshooting steps for testing connections with the specified port.

Author: danielcdmconsultores

py-src/data_formulator/data_loader/mysql_data_loader.py

@@ -14,6 +14,7 @@ def list_params() -> bool:
             {"name": "user", "type": "string", "required": True, "default": "root", "description": ""}, 
             {"name": "password", "type": "string", "required": False, "default": "", "description": "leave blank for no password"}, 
             {"name": "host", "type": "string", "required": True, "default": "localhost", "description": ""}, 
+            {"name": "port", "type": "int", "required": False, "default": 3306, "description": "MySQL server port (default 3306)"},
             {"name": "database", "type": "string", "required": True, "default": "mysql", "description": ""}
         ]
         return params_list
@@ -25,23 +26,24 @@ def auth_instructions() -> str:
 
 1. Local MySQL Setup:
    - Ensure MySQL server is running on your machine
-   - Default connection: host='localhost', user='root'
+   - Default connection: host='localhost', user='root', port=3306
    - If you haven't set a root password, leave password field empty
 
 2. Remote MySQL Connection:
-   - Obtain host address, username, and password from your database administrator
+   - Obtain host address, port, username, and password from your database administrator
    - Ensure the MySQL server allows remote connections
    - Check that your IP is whitelisted in MySQL's user permissions
 
 3. Common Connection Parameters:
    - user: Your MySQL username (default: 'root')
    - password: Your MySQL password (leave empty if no password set)
    - host: MySQL server address (default: 'localhost')
+   - port: MySQL server port (default: 3306)
    - database: Target database name to connect to
 
 4. Troubleshooting:
    - Verify MySQL service is running: `brew services list` (macOS) or `sudo systemctl status mysql` (Linux)
-   - Test connection: `mysql -u [username] -p -h [host] [database]`
+   - Test connection: `mysql -u [username] -p -h [host] -P [port] [database]`
 """
 
     def __init__(self, params: Dict[str, Any], duck_db_conn: duckdb.DuckDBPyConnection):
@@ -54,7 +56,7 @@ def __init__(self, params: Dict[str, Any], duck_db_conn: duckdb.DuckDBPyConnecti
 
         attatch_string = ""
         for key, value in self.params.items():
-            if value:
+            if value is not None and value != "":
                 attatch_string += f"{key}={value} "
 
         # Detach existing mysqldb connection if it exists