Part creation and update to your Access database is already included in the tools, you do this from the Central Library navigator - create your new part then use the 'Edit Parametric data' command from the right mouse button context menu to populate that part into the access database and fill in the missing information. See Paramteric1 & Parametric2 attached.
If you are working in the opposite direction - Access to Central Library then there might be some utilities on the automation community.
As you already have the symbol library and Access database you could run the 'Central Library Migrator' again to create a new library (just rename or backup your old one) and use the options as shown in the attached. Add symbol libraries (if you use an existing project these get picked up from the project file) and add your existing DxDataBook configuration file (*.dbc), see pictures CLMigration 1 to 3 attached.