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#include <stdio.h>
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#include "evpq.h"
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#include "lib/log.h"
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#define CONNINFO_DEFAULT "dbname=test"
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#define QUERY_DEFAULT "SELECT a, b FROM foo"
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void cb_connected (struct evpq_conn *conn, void *arg) {
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INFO("[evpq_test] connected");
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if (evpq_query(conn, QUERY_DEFAULT))
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FATAL("evpq_query");
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}
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void cb_result (struct evpq_conn *conn, PGresult *result, void *arg) {
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INFO("[evpq_test] result: %s", PQresStatus(PQresultStatus(result)));
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// fatal error?
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if (PQresultStatus(result) != PGRES_TUPLES_OK)
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FATAL("error: %s", PQresultErrorMessage(result));
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// dump it to stdout
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PQprintOpt popt = {
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.header = 1,
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.align = 1,
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.standard = 0,
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.html3 = 0,
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.expanded = 1,
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.pager = 0,
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.fieldSep = "|",
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.tableOpt = NULL,
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.caption = NULL,
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.fieldName = NULL,
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};
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PQprint(stdout, result, &popt);
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// don't care about the result anymore
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PQclear(result);
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}
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void cb_done (struct evpq_conn *conn, void *arg) {
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INFO("[evpq_test] done");
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}
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void cb_failure (struct evpq_conn *conn, void *arg) {
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INFO("[evpq_test] failure");
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INFO("\t%s", evpq_error_message(conn));
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FATAL("exiting");
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}
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int main (int argc, char **argv) {
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struct event_base *ev_base = NULL;
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struct evpq_conn *conn = NULL;
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const char *conninfo = CONNINFO_DEFAULT;
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struct evpq_callback_info cb_info = {
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.fn_connected = cb_connected,
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.fn_result = cb_result,
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.fn_done = cb_done,
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.fn_failure = cb_failure,
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.cb_arg = NULL,
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};
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// initialize libevent
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if ((ev_base = event_base_new()) == NULL)
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ERROR("event_base_new");
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// establish the evpq connection
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if ((conn = evpq_connect(ev_base, conninfo, cb_info)) == NULL)
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ERROR("evpq_connect");
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// run libevent
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INFO("running libevent loop");
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if (event_base_dispatch(ev_base))
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ERROR("event_base_dispatch");
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// clean shutdown
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error:
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if (ev_base)
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event_base_free(ev_base);
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}
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