Re: [Vala] Anyone know of a vala postgresql hello world example?

[jp0409 jippii fi]

Hi,

Here is one. This can be added to Vala page as well.

Regards,
JP

-----

valac --pkg libpq test.vala -X -lpq

-----

using GLib;
using Postgres;


public static int main (string[] args)
{
        string conninfo;

        if (args.length > 1) {
                conninfo = args[1];
        } else {
                conninfo = "dbname = postgres";
        }

        /* Make a connection to the database */
        Database conn = Postgres.connect_db (conninfo);

        /* Check to see that the backend connection was successfully made */
        if (conn.get_status () != ConnectionStatus.OK) {
		stderr.printf ("Connection to database failed: %s", 
conn.get_error_message ());
                return 1;
        }

        /*
         * Our test case here involves using a cursor, for which we must be inside
         * a transaction block.  We could do the whole thing with a single
         * PQexec() of "select * from pg_database", but that's too trivial to make
         * a good example.
         */

        /* Start a transaction block */
        Result res = conn.exec ("BEGIN");
        if (res.get_status () != ExecStatus.COMMAND_OK) {
                stderr.printf ("BEGIN command failed: %s", conn.get_error_message ());
                return 1;
        }

        /*
         * Fetch rows from pg_database, the system catalog of databases
         */
        res = conn.exec ("DECLARE myportal CURSOR FOR select * from pg_database");
        if (res.get_status () != ExecStatus.COMMAND_OK) {
                stderr.printf ("DECLARE CURSOR failed: %s", conn.get_error_message ());
                return 1;
        }

        res = conn.exec ("FETCH ALL in myportal");
        if (res.get_status () != ExecStatus.TUPLES_OK) {
                stderr.printf ("FETCH ALL failed: %s", conn.get_error_message ());
                return 1;
        }

        /* first, print out the attribute names */
        int nFields = res.get_n_fields ();
        for (int i = 0; i < nFields; i++) {
                stdout.printf ("%-15s", res.get_field_name (i));
        }
        stdout.printf ("\n\n");

        /* next, print out the rows */
        for (int i = 0; i < res.get_n_tuples(); i++) {
                for (int j = 0; j < nFields; j++) {
                        stdout.printf ("%-15s", res.get_value (i, j));
                }
                stdout.printf ("\n");
        }

        ConnectionOptions opt = Postgres.get_default_options ();
        stdout.printf ("label=%s, keyword=%s\n", opt.label, opt.keyword);

	stdout.printf ("db=%s, user=%s, passwd=%s, host=%s, port=%s, tty=%s, 
options=%s\n", conn.get_db (), conn.get_user (), conn.get_passwd (), 
conn.get_host (), conn.get_port (), conn.get_tty (), conn.get_options 
());

        /* close the portal ... we don't bother to check for errors ... */
        res = conn.exec ("CLOSE myportal");

        /* end the transaction */
        res = conn.exec ("END");

        return 0;
}


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