Hello, ODBC(API) World!

hello.c

#include <windows.h>
#include <tchar.h>
#include <stdio.h>
#include <sqlext.h>
#include <sql.h>
 
int _tmain( int argc, TCHAR* argv[] )
{
    HENV henv;
    HDBC hdbc;
    HSTMT hstmt;
 
    _TCHAR szConnStr[1024];
    _TCHAR szConnOut[1024];
    SQLSMALLINT cchConOut; 
    _TCHAR szSQL[256];
 
    SQLTCHAR szColName[128];
    SQLSMALLINT nBufSize;
    SQLSMALLINT nSqlType;
    SQLUINTEGER nColSize;
    SQLSMALLINT nScale;
    SQLSMALLINT nNullable;
    SQLTCHAR szMessage[256];
    SQLINTEGER nMessageLen;
    SQLRETURN  nReturn;
 
    _tcscpy( szConnStr, _T("Driver={SQL Server};SERVER=(local);DATABASE=master;UID=sa;PWD=P@ssW0rd") );
    _tcscpy( szSQL, _T("SELECT 'Hello, ODBC World!' AS Message") );
 
    SQLAllocEnv( &henv );
    SQLAllocConnect( henv, &hdbc );
    SQLDriverConnect( hdbc, NULL, (SQLTCHAR*)szConnStr, _tcslen(szConnStr), 
        (SQLTCHAR*)szConnOut, _countof(szConnOut), &cchConOut, SQL_DRIVER_NOPROMPT );
    SQLAllocStmt( hdbc, &hstmt );
    SQLExecDirect( hstmt, (SQLTCHAR*)szSQL, SQL_NTS );
    SQLDescribeCol( hstmt, 1, (SQLTCHAR*)szColName, _countof(szColName),
        &nBufSize, &nSqlType, &nColSize, &nScale, &nNullable );
    SQLBindCol( hstmt, 1, SQL_C_TCHAR, szMessage, _countof(szMessage), &nMessageLen );
    while( TRUE )
    {
        nReturn = SQLFetch( hstmt );
        if( nReturn != SQL_SUCCESS
         && nReturn != SQL_SUCCESS_WITH_INFO )
        {
            break;
        }
 
        _tprintf( _T("%s\n"), szColName );
        _tprintf( _T("------------------\n") );
        _tprintf( _T("%s\n"), szMessage );
    }
 
    SQLFreeStmt( hstmt, SQL_DROP );
    SQLDisconnect( hdbc );
    SQLFreeConnect( hdbc );
    SQLFreeEnv( henv );
 
    return 0;
}