Why my query to select from Oracle database turn to text (blank query) every time i run it

I try to run query from Power Bi by usng Power Query and i want to use parameter like the code below

let
    employeeID = 1,  
    Query = "SELECT employee_id, first_name, last_name FROM employees_1 WHERE employee_id = " & Number.ToText(employeeID),  
    Source = Oracle.Database("//localhost:1521/ORCL", [HierarchicalNavigation=true, Query=Query])
in 
    Source

And every time i run it, it turn to a blank query like the picture (https://i.sstatic.net/ihXTzKj8.png)

I try to sreach and still dont know why. Please, help me to fix it.

Solution

open the advanced editor and paste the code in it.