Fixed binary host variables

Your IBM® Informix® ESQL/C program must handle all manipulation of the internal data structure for the fixed binary host variable; it must explicitly allocate memory and assign field values.

The following figure shows how to use a fixed binary host variable to insert and select data in the circle_col column of the circle_tab table (see Figure 4).

Figure 1. Accessing the internal format of the circle opaque data type with a fixed binary host variable

/* Include declaration for circle_t structure */
#include <circle.h>;

EXEC SQL BEGIN DECLARE SECTION;
   fixed binary 'circle' circle_t fbin_circle;
EXEC SQL END DECLARE SECTION;

/* Assign data to members of internal data structure */
fbin_circle.center.x = 1.00;
fbin_circle.center.y = 17.00;
fbin_circle.radius = 15.25; 

/* Insert a new circle_tab row with a fixed binary host
 * variable */
EXEC SQL insert into circle_tab values (:fbin_circle);

/* Select a circle_tab row from into a fixed binary 
 * host variable */
EXEC SQL select circle_col into :fbin_circle
   from circle_tab
   where radius(circle_col) = 15.25;
if ((fbin_circle.center.x == 1.00) &&
      (fbin_circle.center.y == 17.00))
   printf("coordinates = (%d, %d)\n",
      fbin_circle.center.x,   fbin_circle.center.y);