$conn object within a SAAS environment

Good Evening,

We have recently transformed our legacy phprunner application to a saas infrastructure following the steps in the following article:

https://xlinesoft.com/blog/2019/10/03/saas-application-design/

Within the application generated code, everything is working well. However, we had a lot of custom queries in events and external function packages that we had created.
Most of these queries referenced the $conn global object in order to establish connection to the Database.

For example:

//////////////////////
global $conn;
$sql = "SELECT * FROM table where (Session='$_SESSION[Session]')";
$result = mysqli_query($conn,$sql);
while ($row = mysqli_fetch_assoc($result))
{
$field = $row["field"];
}
/////////////////////////

We have noticed that since changing to SAAS, the $conn object now references the primary saas database with user information and not the second connection that is established to the main database with all the data.

Tables and views in the main Database do not seem to be available using the $conn connection.

My question is, what global variable is available in the system to reference the secondary connection to the main Database? $connx?

I hope I have correctly illustrated.

Thank you