/*
 * testlibpq.c
 *
 *      Test the C version of libpq, the PostgreSQL frontend library.
 */
#include <stdio.h>
#include <stdlib.h>
#include <libpq-fe.h>

int execCommand(PGconn * conn, char *command) ;

static void
exit_nicely(PGconn *conn)
{
    PQfinish(conn);
    exit(1);
}

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

    /*
     * 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));
        exit_nicely(conn);
    }

    res = PQexec(conn, "SELECT * FROM PIPPO");

    if (PQresultStatus(res) != PGRES_TUPLES_OK) {

        printf("No data retrieved\n");
        PQclear(res);
        exit_nicely(0);
    }

    int rows = PQntuples(res);

    for(int i=0; i<rows; i++) {

        char *value = PQgetvalue(res, i, 0);
        printf("%s\n", value);
    }

    PQclear(res);


    if(execCommand(conn, "INSERT INTO PIPPO VALUES('ciao')")!=0) {
        printf("Command not executed\n");
        exit_nicely(0);
    }

    PQfinish(conn);


    return 0;
}

int execCommand(PGconn * conn, char *command) {
    PGresult   *res;
    res = PQexec(conn, command);
    if (PQresultStatus(res) != PGRES_COMMAND_OK) {
        PQclear(res);
        return -1;
    }
    return 0;

}