delete room when empty

back/db/Room-db.ts

@@ -12,8 +12,10 @@ export async function getRoomOwner(roomId: number) {
     return await execQueryAsync(query, values);
 }
 
+/**
+ * get all the data needed to reply to a message in a room
+ */
 export async function getLastMsgData(roomId: number) {
-
     const query = `
         SELECT 
             msg.message_id AS id,
@@ -59,3 +61,21 @@ export async function getLastMsgData(roomId: number) {
     const values = [roomId];
     return await execQueryAsync(query, values);
 }
+
+export async function getRoomOnMessageId(messageId: number) {
+    const query = `SELECT room_id FROM app_room_message WHERE message_id = ?`;
+    const values = [messageId];
+    return await execQueryAsync(query, values);
+}
+
+export async function getRoomNbMessage(roomId: number) {
+    const query = `SELECT COUNT(room_id) AS nbMessage FROM app_room_message WHERE room_id = ?`;
+    const values = [roomId];
+    return await execQueryAsync(query, values);
+}
+
+export async function deleteRoom(roomId: number) {
+    const query = `DELETE FROM app_room WHERE room_id = ?`;
+    const values = [roomId];
+    return await execQueryAsync(query, values);
+}