Our tool uses SQL Server 2012 LocalDB to store data. This as installed by the MSI, not full express. Users recently moved to new machines using other applications that connect via SQL Server 2019.
My understanding is that installing SQL Server LocalDB on top of an installation of SQL Server 2019 shouldn't cause an issue, being as how SQL Server Express installs as a named instance by default.
My concern when I look at connection strings, however, is that mine doesn't identify the server instance quite in the way I've seen recommended, only the Data Source:
Data Source=(localdb)\v11.0;Integrated Security=True;AttachDbFileName=C:\Database\Database.mdf;Connection Timeout=10000
This does connect, in case there's doubt. But referencing connectionStrings.com, I see recommended this:
Server=(localdb)\v11.0;Integrated Security=true;AttachDbFileName=C:\MyFolder\MyData.mdf;
In my mind, Data Source=(localdb)\v11.0 is already a clear designation of the instance, but I'm unsure what happens when SQL Server Express installs after SQL Server.
What should I look out for? Do I need to replace Data Source with Server? Will I need to change any part of (localdb)\v11.0 to account for the order SQL Server Express has been installed in compared with SQL Server?
EDIT 1
Updating the connection string by replacing 'Data Source' with 'Server' works. The question still remains, how will LocalDBs installing second affect what follows Server=?