from($from)

join($table, $cond[, $type = ''[, $escape = NULL]])

cache_on()

add_column($table[, $field = array()[, $_after = NULL]])

class CI_DB_forge add_column($table[, $field = array()[, $_after = NULL]])

or_not_like($field[, $match = ''[, $side = 'both'[, $escape = NULL]]])

num_rows()

group_by($by[, $escape = NULL])

db_pconnect()

dbprefix([$table = ''])