Advanced Queuing - Oracle

AQ and Memory Usage
OCIErrorGet ((dvoid *) errhp, (ub4) 1, (text *) NULL, &errcode,
errbuf, (ub4) sizeof(errbuf), (ub4) OCI_HTYPE_ERROR);
printf("Error - %s\n", errbuf);
break;
case OCI_INVALID_HANDLE:
printf("Error - OCI_INVALID_HANDLE\n");
break;
default:
printf("Error - %d\n", status);
break;
}
exit(-1);
} /* end checkerr */
Dequeuing Messages (Free Memory After Every Call) Using OCI
This program, deqnoreuse.c, dequeues each line of text from a queue 'msgqueue'
that has been created in scott's schema by executing create_types.sql. Messages
are enqueued using enqnoreuse or enqreuse. If there are no messages, it waits
for 60 seconds before timing out. In this program the dequeue subroutine does not
reuse client side objects' memory. It allocates the required memory before dequeue
and frees it after the dequeue is complete.
#ifndef OCI_ORACLE
#include
#endif
#include
static void checkerr(OCIError *errhp, sword status);
static void deqmesg(text *buf, ub4 *buflen);
LNOCIEnv *envhp;
LNOCIError *errhp;
LNOCISvcCtx *svchp;
struct message
{
OCINumber id;
OCIString *data;
};
typedef struct message message;
struct null_message
{
A-80 Oracle9i Application Developer’s Guide - Advanced Queuing