SQL Databases from before 2.3.16

[John Ralls]

On Dec 8, 2010, at 6:36 AM, Phil Longstaff wrote:

> Support for this already exists.  There's a "versions" table which has 
> table-name/table-version pairs.  This is loaded automatically when the file is 
> opened.  The backend code for each object type contains a "create tables" 
> routine which is called to create and/or update tables for that object type.  At 
> this time, if the table version is not current, it can be updated.  There is 
> already some code for various object types which have handled some upgrades 
> through the 2.3.X series.
> 

That addresses changes to the schema (that is, how many columns are in a table, what their names and types are, which ones are keys, etc.) but not changes to how the rows are saved and retrieved in the backend. The changes I made in r19729 and r19911 were in the latter category.

Regards,
John Ralls