update tabl1 set field1=field1+1 where your_condition
db(some dal condtion like: db.table1.id>0).update(field1=db.table1.field1+1)
update tabl1 set field1=field1+1 where your_condition
db(some dal condtion like: db.table1.id>0).update(field1=db.table1.field1+1)