Creating triggers

to do

persons = Table('Person').add_cols(Column('firstname').text.not_null.default("''"),\
                               Column('lastname').text.not_null.default("''"),\
                               Column('bio').text.not_null.default("''"))\
                         .add_constraints(Unique('firstname').on_conflict_replace)

log = Table('Log').add_cols(Column('pId').integer.not_null,
                        Column('firstname').text.not_null,
                        Column('lastname').text.not_null,
                        Column('bio').text.not_null,
                        Column('time').timestamp.default_current_timestamp)

# Create a trigger that keeps the log up to date                                                             
# I recommend using temp triggers unless you see a performance hit                                           
trigger = Trigger('tr_log').temp.if_not_exists

trigger.after.update_on(log.name)

# Raw sql                                                                                                    
trigger.do_sql("INSERT INTO {table} ({cols}) VALUES({oldcols})"\
             .format(table=log.name,
                     cols=log.list_column_names(exclude=['_id','time']),
                     oldcols=persons.list_column_names(exclude=[],
                                                       prefix="old.")))