Hi
I think it's possible with parameter and some custom with M query. Please refer topic (http://biinsight.com/power-bi-desktop-query-parameters-part-1/) to be aware about using parameter and some basic custom with queries in Query Editor.
After that, you could implement your idea by storing all connection string in 1 table. This table will be loaded firstly and another custom queries will get connection information from this table to reload itself. Please check it and let me know if you still stuck with it, I will update sample for that.
I think it's possible with parameter and some custom with M query. Please refer topic (http://biinsight.com/power-bi-desktop-query-parameters-part-1/) to be aware about using parameter and some basic custom with queries in Query Editor.
After that, you could implement your idea by storing all connection string in 1 table. This table will be loaded firstly and another custom queries will get connection information from this table to reload itself. Please check it and let me know if you still stuck with it, I will update sample for that.