Remove CI_DB_oci8_result::data_seek()

It can only call oci_execute() in order to reset the pointer to 0,
the oci8 driver doesn't support setting the pointer.

Due to the result_object(), result_array() and custom_result_object()
calling data_seek() every time prior to fetching the result set, this
only causes the query to be executed twice. All of the three methods
now cast from existing result_object and/or result_array sets, so the
probability to ever need to really fetch the result set again is
practically zero and so this method doesn't bring any benefit.
1 file changed