I found this answer but I'm not sure it does what I want to. It looks like it updates ALL rows in the table, where I only want to update one.
My table is very simple:
MacAddress           |    Name
1C-6F-65-C6-20-0B    |    Logan-PC
DE-AD-BE-EF-F0-0D    |    PC1
...
MacAddress is the PK and I want to simply be able to update Name if it exists or add a new row if it does not, given the MacAddress as references and a Name string.
This is the first time I'm using SQLite so I may just not be understanding Eric B's answer correctly.
 
     
    