To use, see the appearance section in opensim.ini.example, set "persist = true", then add the correct connection string for your database.(see mysql-AvatarAppearance.sql in share folder for a example of the table mysql table structure).
This could possible be used in a very small grid, but would mean each region server would need to connect to the same mysql database.
But the work to move the code to one of the grid servers shouldn't be too much.
* Added PrimitiveBaseShapeTableMapper to show how it's done
NOTE: Nothing actually works yet - this code should be considered more of educational value until it's all wired together