Connection base de données sql server via ODBC en C

#include <windows.h>
#include <sql.h>
#include <sqlext.h>
#include <sqltypes.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <iostream>

#define MAIN_LEN 80

SQLHENV     henv;
SQLHDBC     hdbc;
SQLHSTMT    hstmt;

using namespace std;

void main ()
{
SQLRETURN retcode;
SQLCHAR COL2[MAIN_LEN+1];
 	
// Exemple de requete
char requete[1024+1]="SELECT * FROM TABLE_TEST";
char Serveur[MAIN_LEN+1]="";
char Login[MAIN_LEN+1]="USER-TEST";
char Pwd[MAIN_LEN+1]="azerty__00";	
	
// Connexion à la base de données	

retcode=SQLAllocHandle(SQL_HANDLE_ENV, SQL_NULL_HANDLE, &henv);

			if(retcode == SQL_SUCCESS || retcode == SQL_SUCCESS_WITH_INFO)
				retcode=SQLSetEnvAttr(henv, SQL_ATTR_ODBC_VERSION, (void*)SQL_OV_ODBC3,0);
				
			if(retcode == SQL_SUCCESS || retcode == SQL_SUCCESS_WITH_INFO)
				retcode=SQLAllocHandle(SQL_HANDLE_DBC, henv, &hdbc);

			else
			{
				printf("Erreur sur l'instruction SQLAllocHandle1 !\n");
			}
			
			// Vérification du Lien ODBC, Login Et Pwd	
			if(retcode == SQL_SUCCESS || retcode == SQL_SUCCESS_WITH_INFO)
				retcode=SQLConnect(hdbc, (SQLCHAR*)Serveur, SQL_NTS, (SQLCHAR*)Login, SQL_NTS, (SQLCHAR*)Pwd, SQL_NTS);
			
			else
			{
				printf("Erreur sur l'instruction SQLSetEnvAttr !\n");
			}
			
			if(retcode == SQL_SUCCESS || retcode == SQL_SUCCESS_WITH_INFO)
				retcode=SQLAllocHandle(SQL_HANDLE_STMT, hdbc, &hstmt);
			
			else
			{
				printf("Erreur sur l'instruction SQLConnect !\n");
				cout<<"ret :"<<retcode<<"\n";
			}
		
			// Execution de la requete
			if(retcode == SQL_SUCCESS || retcode == SQL_SUCCESS_WITH_INFO)
				retcode=SQLExecDirect(hstmt, (SQLCHAR*)requete, SQL_NTS);
			
			else
			{
				printf("Erreur sur l'instruction SQLAllocHandle2 !\n");
				cout<<"ret :"<<retcode<<"\n";
			}
			
			if (retcode == SQL_SUCCESS || retcode == SQL_SUCCESS_WITH_INFO)
			{  
				while (TRUE)
				{
					retcode = SQLFetch(hstmt);
					if (retcode == SQL_SUCCESS || retcode == SQL_SUCCESS_WITH_INFO)
					{
						SQLGetData(hstmt, 2,SQL_C_CHAR, COL2, sizeof(COL2),NULL);
						cout<<"col2 :"<<COL2<<"\n";
					}
				}
			}							
// Déconnexion 
SQLFreeStmt(hstmt, SQL_DROP);
SQLDisconnect(hdbc);
SQLFreeConnect(hdbc);
getchar ();	
}

if(retcode == SQL_SUCCESS || retcode == SQL_SUCCESS_WITH_INFO)
				retcode=SQLAllocHandle(SQL_HANDLE_STMT, hdbc, &hstmt);
			
			else
			{
				printf("Erreur sur l'instruction SQLAllocHandle !\n");
				cout<<"ret :"<<retcode<<"\n";
			}
		
			// Execution de la requete
			if(retcode == SQL_SUCCESS || retcode == SQL_SUCCESS_WITH_INFO)
				retcode=SQLExecDirect(hstmt, (SQLCHAR*)requete, SQL_NTS);
			
			else
			{
				printf("Erreur sur l'instruction SQLExecDirect !\n");
				cout<<"ret :"<<retcode<<"\n";
			}