From 720bf822cbec71fa202c162f1fffd8d9589f5889 Mon Sep 17 00:00:00 2001
From: Thadeu Lima de Souza Cascardo <cascardo@holoscopio.com>
Date: Fri, 9 Oct 2009 09:07:37 -0300
Subject: [PATCH] Get talk title and iterate through its talkers.

---
 helper.c       | 34 ++++++++++++++++++++++++++++
 helper.h       |  2 ++
 helper_test2.c | 60 ++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 96 insertions(+)
 create mode 100644 helper_test2.c

diff --git a/helper.c b/helper.c
index fd3a083..6834e67 100644
--- a/helper.c
+++ b/helper.c
@@ -59,6 +59,23 @@ static char * get_oneliner_field_by_id(sqlite3 *db, char *query,
 	return value;
 }
 
+static int get_many_ids(sqlite3 *db, char *query, size_t qlen, int *ids,
+			size_t len)
+{
+	sqlite3_stmt *stmt;
+	int r;
+	int i = 0;
+	if (!qlen)
+		qlen = strlen(query);
+	r = sqlite3_prepare_v2(db, query, qlen, &stmt, NULL);
+	while (sqlite3_step(stmt) == SQLITE_ROW) {
+		if (i < len)
+			ids[i++] = sqlite3_column_int(stmt, 0);
+	}
+	sqlite3_finalize(stmt);
+	return i;
+}
+
 char * get_talker_email(sqlite3 *db, int id)
 {
 	return get_oneliner_field_by_id(db, talker_user_query, "email", id);
@@ -70,4 +87,21 @@ char * get_talker_name(sqlite3 *db, int id)
 					id);
 }
 
+static char * talk_title_query = "select %s from events_talk where id = %d;";
+char * get_talk_title(sqlite3 *db, int id)
+{
+	return get_oneliner_field_by_id(db, talk_title_query, "title", id);
+}
 
+static char *talk_talkers_query = "select speaker_id from "
+	"events_talk_speakers where talk_id = %d;";
+int get_talk_talkers(sqlite3 *db, int id, int *ids, int len)
+{
+	int r;
+	char *query;
+	size_t qlen;
+	qlen = asprintf(&query, talk_talkers_query, id);
+	r = get_many_ids(db, query, qlen, ids, len);
+	free(query);
+	return r;
+}
diff --git a/helper.h b/helper.h
index df43f9c..a5af310 100644
--- a/helper.h
+++ b/helper.h
@@ -24,5 +24,7 @@
 
 char * get_talker_email(sqlite3 *db, int id);
 char * get_talker_name(sqlite3 *db, int id);
+char * get_talk_title(sqlite3 *db, int id);
+int get_talk_talkers(sqlite3 *db, int id, int *ids, int len);
 
 #endif
diff --git a/helper_test2.c b/helper_test2.c
new file mode 100644
index 0000000..2aa1e16
--- /dev/null
+++ b/helper_test2.c
@@ -0,0 +1,60 @@
+/*
+ *  Copyright (C) 2009  Thadeu Lima de Souza Cascardo <cascardo@holoscopio.com>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+
+#include "helper.h"
+#include <stdio.h>
+#include <stdlib.h>
+
+int main(int argc, char **argv)
+{
+	sqlite3 *db;
+	char *dbname;
+	char *title;
+	char *email;
+	int talk_id;
+	int ids[16];
+	int nids;
+	int i;
+	if (argc < 3) {
+		fprintf(stderr, "<program> <db> <id>\n");
+		return 1;
+	}
+	dbname = argv[1];
+	talk_id = atoi(argv[2]);
+	sqlite3_open(dbname, &db);
+	title = get_talk_title(db, talk_id);
+	if (title) {
+		printf("Talk title is %s\n", title);
+		free(title);
+	} else {
+		fprintf(stderr, "Could not find talk\n");
+	}
+	nids = get_talk_talkers(db, talk_id, ids, 16);
+	for (i = 0; i < nids; i++) {
+		email = get_talker_email(db, ids[i]);
+		if (email) {
+			printf("Talker email is %s\n", email);
+			free(email);
+		} else {
+			fprintf(stderr, "Could not find talker\n");
+		}
+	}
+	sqlite3_close(db);
+	return 0;
+}
-- 
2.20.1