How do I get sdo_point into C host variables from OTT structures?

Question

How do I get sdo_point info into C host variables from structures generated by OTT?
Databse Version 10.1.0
I am using OTT to generate C structures for the Oracle Spatial datatype sdo_geometry. The file is generated as
#ifndef GEOMETRY_ORACLE
# define GEOMETRY_ORACLE
#ifndef OCI_ORACLE
# include <oci.h>
#endif
typedef OCIRef sdo_geometry_ref;
typedef OCIRef sdo_point_type_ref;
typedef OCIArray sdo_elem_info_array;
typedef OCIArray sdo_ordinate_array;
struct sdo_point_type
OCINumber x;
OCINumber y;
OCINumber z;
typedef struct sdo_point_type sdo_point_type;
struct sdo_point_type_ind
OCIInd _atomic;
OCIInd x;
OCIInd y;
OCIInd z;
typedef struct sdo_point_type_ind sdo_point_type_ind;
struct sdo_geometry
OCINumber sdo_gtype;
OCINumber sdo_srid;
struct sdo_point_type sdo_point;
sdo_elem_info_array * sdo_elem_info;
sdo_ordinate_array * sdo_ordinates;
typedef struct sdo_geometry sdo_geometry;
struct sdo_geometry_ind
OCIInd _atomic;
OCIInd sdo_gtype;
OCIInd sdo_srid;
struct sdo_point_type_ind sdo_point;
OCIInd sdo_elem_info;
OCIInd sdo_ordinates;
typedef struct sdo_geometry_ind sdo_geometry_ind;
#endif
I can successfully access the sdo_gtype and sdo_ordinates using the following ProC code
exec sql begin declare section;
int sptype;
double coord[100000];
sdo_geometry *spgeom;
sdo_ordinate_array *spcoords;
exec sql end declare section;
/* allocate memory for the geometry host variable */
exec sql allocate :spgeom;
select bounds into :spgeom from boundary;
/* retrieve the geometry type from the geometry host variable into a host variable */
exec sql object get sdo_gtype from :spgeom into :sptype;
/* allocate memory for the sdo_ordinate_array host variable */
exec sql allocate :spcoords;
/* move the coordinates from the geometry host variable into the sdo_ordinate_array host variable */
exec sql object get sdo_ordinates from :spgeom into :spcoords;
/* determine the number of coordinates */
exec sql collection describe :spcoords get size into :numord;
/* move the coordinates from the sdo_ordinate_array host variable into a host array */
exec sql for :numord collection get :spcoords into :coord;
I cannot, however, figure out how to get point data out of the host variable spgeom. If I prepare code analagous to the other types in the geometry structure, I get an error. I can see that sdo_point is different because it is a struct within the geometry definiton of typedef OCIRef but my knowledge of C is sufficeintly weak that I cannot figure out how to get sdo_point into C host variables. Some sample code for getting the sdo_point data would be greatly appeciated.
Thanks, Chris

Answer 1

To get point data from geometry column use following
select a.location.sdo_point.x, a.geometrycolumn.sdo_point.y
from tablename a;
Do not forget to alias the table.