Oracle空间数据库的读取与写入

  printf("-- element type: %u \n", element_type);
  fflush (stdout);

  return element_type;
}

/*******************************************************************************
**
** Routine:     get_interpretation
**
** Description: Prints the interpretation field for current element.
**
*******************************************************************************/
ub4
WReadAndWriteGeometry::get_interpretation (void)

{
  boolean        exists;
  OCINumber      *oci_number;
  ub4            interpretation;

  checkerr(errhp, OCICollGetElem(envhp, errhp,
                                 (OCIColl *)(m_geom_obj->sdo_elem_info),
            (sb4)(global_elem_index + 2),
                                 (boolean *)&exists,
            (dvoid **)&oci_number, (dvoid **)0));

  checkerr(errhp, OCINumberToInt(errhp, oci_number,
     (uword)sizeof(ub4), OCI_NUMBER_UNSIGNED,
     (dvoid *)&interpretation));

  printf("-- interpretation: %u \n", interpretation);
  fflush(stdout);

  return interpretation;
}

/*******************************************************************************
**
** Routine:     get_ordinates
**
** Description: Prints ordinates out of the ordinates array.
**
*******************************************************************************/
void
WReadAndWriteGeometry::get_ordinates (int starting_offset, int ending_offset)

{
  int col;
  boolean        exists;
  OCINumber      *oci_number;
  double         double_val;

  /*
  ** Get ordinates for the current element.
  */
  for (col = starting_offset; col <= ending_offset; col++)
  {
    checkerr(errhp, OCICollGetElem(envhp, errhp,
       (OCIColl *)(m_geom_obj->sdo_ordinates),
       (sb4)col, (boolean *)&exists,
       (dvoid **)&oci_number, (dvoid **)0));
    checkerr(errhp, OCINumberToReal(errhp, oci_number, (uword)sizeof(double),
     (dvoid *)&double_val));
 
    if ((col % global_num_dimensions) == 0)
      printf("%.9lf", double_val);
    else
      printf(", %.9lf", double_val);

    if ((col % global_num_dimensions) == (global_num_dimensions - 1))
      printf("\n");
  } /* end for */

  printf("\n");
}

/*******************************************************************************
**
** Routine:     get_next_ending_offset
**
** Description: Returns the ending offset of current element.
**
*******************************************************************************/
int
WReadAndWriteGeometry::get_next_ending_offset (int processing_type_4or5)

{
  boolean        exists;
  OCINumber      *oci_number;
  int            ending_offset;

  /* last element? */
  if (global_elem_index == global_nelems - 3)
    ending_offset = global_nords;
  else
  {
    checkerr(errhp, OCICollGetElem(envhp, errhp,
              (OCIColl *)(m_geom_obj->sdo_elem_info),
              (sb4)(global_elem_index + 3),
                                   (boolean *)&exists,
              (dvoid **)&oci_number, (dvoid **)0));
    checkerr(errhp, OCINumberToInt(errhp,
              oci_number,
              (uword)sizeof(int), OCI_NUMBER_SIGNED,
              (dvoid *)&ending_offset));

    if (processing_type_4or5)
    {
      /* Add 1 to next elements starting offset */
      ending_offset++;
    }
    else
    {
      /* Subtract 1 from next elements starting offset */
      ending_offset--;
    }
  }

  /* shift offsets from 1..n to 0..n-1 */
  ending_offset--;

  printf("-- ending offset: %d \n", ending_offset+1);

  return ending_offset;
}

/*******************************************************************************
**
** Routine:     get_next_starting_offset
**
** Description: Returns the starting offset of the current element.
**
*******************************************************************************/
int
WReadAndWriteGeometry::get_next_starting_offset (int read_varray)

{
  boolean        exists;
  OCINumber      *oci_number;
  int            starting_offset;

  /* get the element info structure */
  if (read_varray)
  {
    /* This is the first element, get the starting offset */
    checkerr(errhp, OCICollGetElem(envhp, errhp,
              (OCIColl *)(m_geom_obj->sdo_elem_info),
              (sb4)(global_elem_index), (boolean *)&exists,
              (dvoid **)&oci_number, (dvoid **)0));

    /* get starting and ending offsets in ordinate array */
    checkerr(errhp, OCINumberToInt(errhp, oci_number,
       (uword)sizeof(ub4), OCI_NUMBER_SIGNED,
       (dvoid *)&starting_offset));

    /* shift offsets from 1..n to 0..n-1 */
    starting_offset--;
  }
  else
    starting_offset = global_ending_offset + 1;
     
  printf("-- starting offset: %d \n", starting_offset+1);

  return starting_offset;
}

/*******************************************************************************
**
** Routine:     sc_ops_get_type1
**
** Description: Print the ordinates for a type1 element.
**
*******************************************************************************/
void
WReadAndWriteGeometry::sc_ops_get_type1 (void)

{
   int i,
       interp,
       start,
       end;

   start = get_next_starting_offset (global_ending_offset == -1);
   end = get_next_ending_offset (0);
   interp = get_interpretation ();

   for (i = 0; i < interp; i++)
   {
     get_ordinates (start,
                    start + global_num_dimensions - 1);
     start = start + global_num_dimensions;
   }
}

/*******************************************************************************
**
** Routine:     sc_ops_get_type2
**
** Description: Print the ordi

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