ADD-TRANSACTION-COMMIT-HOOK — Specify hooks to be run when committing changes.
Function
commit-hookA designator for a function with no required arguments.
databaseA database object. This will default to the value of *default-database*.
resultThe list of currently defined commit hooks for
            database.
            
        Adds commit-hook, which should a
        designator for a function with no required arguments, to the
        list of hooks run when commit is called
        on database which defaults to
        *default-database*.
      
(start-transaction)
=> NIL 
(add-transaction-commit-hook #'(lambda () (print "Successfully committed.")))
=> (#<Interpreted Function (LAMBDA # #) {48E2E689}>)
(commit)
"Successfully committed." 
=> NIL