Custom connector Power Bi

Hello,

I need create a new cutom connector for Power Bi. In the code is necessary put conection to the database included user and paswword for to connect automatically.

In the next try i put the folow code:

section HelloWorld;

[DataSource.Kind="HelloWorld", Publish="HelloWorld.Publish"]
shared HelloWorld.Contents = (optional message as text) =>
//     let
//         _message = if (message <> null) then message else "(no message)",
//         a = "Hello from HelloWorld: " & _message
//     in
//         a;

        let
            HELLO = Oracle.Database("ORADES11", [HierarchicalNavigation=true, Query="ANY QUERY"])
        in
            HELLO;

// Data Source Kind description
HelloWorld = [
    TestConnection = (dataSourcePath) => {"HelloWorld.Contents"},
    Authentication = [
        UsernamePassword = [Username = "USERNAME", Password = "PASSWORD"]
    ],
    Label = Extension.LoadString("DataSourceLabel")
];

what I try to do is pass the database, a query already made and the credentials so that automatically in power bi desktop, login automatically .

I do not know if it is possible in a connector and if so I do not know how it could be done.

Thank you