libpq - PGexecPrepared - INT4OID binary parameter mode not working

[jp(dot)duval(at)up-comp(dot)com]

Good morning.

Could someone help me on understanding why PQexecParams is not working properly
while using parameters in binary mode?

I use PostgreSQL 8.1 on Windows XP. The database server and the client are on
the same computer. Enclosed:
1) Table used.
2) An example using text mode that is working.
3) The same example using binary mode that is not working.

Is it possible to trave the behavior of libpq?

Jean-Pierre DUVAL, Product Manager - jp(dot)duval(at)up-comp(dot)com - www.up-comp.com

* * *

TABLE scott.emp
/*************/
CREATE TABLE scott.emp
   (
   empno int4 NOT NULL,
   ename varchar(10) NOT NULL,
   job varchar(9),
   mgr int4,
   hiredate date,
   sal float8,
   comm float8,
   deptno int4 NOT NULL
   ) WITHOUT OIDS;

* * *

long Working(PGconn *HandleConnexion)
/***********************************/
{
Oid TableParametresTypesTransmis[]={INT4OID};
char *Valeur="10";
char *TableParametresValeursTransmis[]={(char *)Valeur};
int TableParametresTaillesTransmis[]={2};
int TableParametresFormatsTransmis[]={0};

PGresult *Handle;
long NbEnregistrements;

Handle=PQexecParams(HandleConnexion,
   "SELECT ename, hiredate, empno, sal FROM scott.emp WHERE deptno=$1::int4",
  
1,TableParametresTypesTransmis,TableParametresValeursTransmis,TableParametresTaillesTransmis,TableParametresFormatsTransmis,1);
if (!Handle)
   return(0);
switch (PQresultStatus(Handle))
   {
   case PGRES_COMMAND_OK :
   case PGRES_TUPLES_OK :
   case PGRES_COPY_OUT :
   case PGRES_COPY_IN :
   case PGRES_NONFATAL_ERROR :
      break;

   case PGRES_EMPTY_QUERY :
      LireNbEnregistrementsAffectes=0;
      return(1);
      break;

   default :
      break;
   }
NbEnregistrements=(long)PQntuples(Handle);
/***************************************/
/* NbEnregistrements == 3, what is Ok. */
/***************************************/
return(NbEnregistrements);
}

long NotWorking(PGconn *HandleConnexion)
/**************************************/
{
Oid TableParametresTypesTransmis[]={INT4OID};
int Valeur=10;
char *TableParametresValeursTransmis[]={(char *)&Valeur};
int TableParametresTaillesTransmis[]={sizeof(int)};
int TableParametresFormatsTransmis[]={1};

PGresult *Handle;
long NbEnregistrements;

Handle=PQexecParams(HandleConnexion,
   "SELECT ename, hiredate, empno, sal FROM scott.emp WHERE deptno=$1::int4",
  
1,TableParametresTypesTransmis,TableParametresValeursTransmis,TableParametresTaillesTransmis,TableParametresFormatsTransmis,1);
if (!Handle)
   return(0);
switch (PQresultStatus(Handle))
   {
   case PGRES_COMMAND_OK :
   case PGRES_TUPLES_OK :
   case PGRES_COPY_OUT :
   case PGRES_COPY_IN :
   case PGRES_NONFATAL_ERROR :
      break;

   case PGRES_EMPTY_QUERY :
      LireNbEnregistrementsAffectes=0;
      return(1);
      break;

   default :
      break;
   }
NbEnregistrements=(long)PQntuples(Handle);
/******************************************/
/* NbEnregistrements == 0, what is FALSE. */
/******************************************/
return(NbEnregistrements);
}