#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include "libpq-fe.h"

int
main(int argc, char **argv)
{
	const char *conninfo;
	PGconn	   *conn;
	PGresult   *res;

	/*
	 * If the user supplies a parameter on the command line, use it as the
	 * conninfo string; otherwise default to setting dbname=postgres and using
	 * environment variables or defaults for all other connection parameters.
	 */
	if (argc > 1)
		conninfo = argv[1];
	else
		conninfo = "dbname = postgres";

	/* Make a connection to the database */
	conn = PQconnectdb(conninfo);

	/* Check to see that the backend connection was successfully made */
	if (PQstatus(conn) != CONNECTION_OK)
	{
		fprintf(stderr, "Connection to database failed: %s",
				PQerrorMessage(conn));
		return 1;
	}

	res = PQexecParams(conn,
					   "/* nothing */",
					   0,		/* no params */
					   NULL,	/* let the backend deduce param type */
					   NULL,
					   NULL,	/* don't need param lengths since text */
					   NULL,	/* default to all text params */
					   0);


	if (PQresultStatus(res) != PGRES_TUPLES_OK)
	{
		fprintf(stderr, "query failed: %s", PQerrorMessage(conn));
	}

	PQclear(res);

	/* close the connection to the database and cleanup */
	PQfinish(conn);

	return 0;
}