is there any method available in baan through which i can directly write data from session field in table
for example
i am entering following detail user_id, user_name,user_password
before entering user_name can i save user_id in table or how can i freeze it

Do you mean, as soon as you enter the User Id, you want that value to be saved in Table? If yes then, you can

execute(update.db)


in the when.field.changes section of the User Id Field(that is after you put the check.input section or the dal field section to validate the field)