{
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  {
   "cell_type": "markdown",
   "id": "1cb14cc6-c543-49e3-b692-72cac0b25f88",
   "metadata": {},
   "source": [
    "# Demonstrate Events"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "c409851d-e366-4301-940e-ae88a594a3e4",
   "metadata": {},
   "outputs": [],
   "source": [
    "from DATA225utils import make_connection, dataframe_query"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "eb637f90-2084-4c2f-8b3d-26ae6512f2d4",
   "metadata": {},
   "outputs": [],
   "source": [
    "conn = make_connection(config_file = 'monitor.ini')\n",
    "cursor = conn.cursor()"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "c24069f8-cc73-4ddc-a2fb-63d14af9de85",
   "metadata": {},
   "source": [
    "## Is the Event Scheduler On?"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "bcf90dea-1acb-4c9f-b75c-eaa6f481a8d3",
   "metadata": {},
   "outputs": [],
   "source": [
    "_, df = dataframe_query(conn, \"SHOW VARIABLES LIKE 'event_scheduler'\")\n",
    "df"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "c4c0f923-0cce-4a3a-8ce7-9201a6867762",
   "metadata": {},
   "source": [
    "## The recording table"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "9c937338-30d6-4eed-93a8-10ebe738b759",
   "metadata": {},
   "outputs": [],
   "source": [
    "cursor.execute('DROP TABLE IF EXISTS recording')\n",
    "\n",
    "sql = ( \"\"\"\n",
    "        CREATE TABLE recording\n",
    "        (\n",
    "            id INT UNIQUE NOT NULL AUTO_INCREMENT,\n",
    "            timestamp DATETIME NOT NULL,\n",
    "            message VARCHAR(32),\n",
    "            PRIMARY KEY (id)\n",
    "        )\n",
    "        \"\"\"\n",
    "    )\n",
    "\n",
    "cursor.execute(sql);"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "3e51b161-ec7e-41d3-8f75-190f797d0b4d",
   "metadata": {},
   "source": [
    "## Event: Fire Only Once"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "695469c6-db5f-45ec-bc99-a3904364d461",
   "metadata": {},
   "outputs": [],
   "source": [
    "cursor.execute('DROP EVENT IF EXISTS start_recording')\n",
    "\n",
    "sql = ( \"\"\"\n",
    "        CREATE EVENT start_recording\n",
    "            ON SCHEDULE AT NOW()\n",
    "        DO BEGIN\n",
    "            INSERT INTO recording(timestamp, message)\n",
    "                VALUES (NOW(), CONCAT('Starting at ', \n",
    "                                      DATE_FORMAT(NOW(), '%r')));\n",
    "        END\n",
    "        \"\"\"\n",
    "      )\n",
    "\n",
    "cursor.execute(sql)"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "5e4f759b-f634-4628-a7fd-8dba40d2033c",
   "metadata": {},
   "source": [
    "## Event: Fire Repeatedly"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "6aeffa9b-9679-4b6e-b8a8-0098ae5ee3b2",
   "metadata": {},
   "outputs": [],
   "source": [
    "cursor.execute('DROP EVENT IF EXISTS monitor_every_2_seconds')\n",
    "\n",
    "sql = ( \"\"\"\n",
    "        CREATE EVENT monitor_every_2_seconds\n",
    "            ON SCHEDULE EVERY 2 SECOND\n",
    "            STARTS NOW() + INTERVAL 5 SECOND\n",
    "            ENDS NOW() + INTERVAL 30 SECOND\n",
    "        DO BEGIN\n",
    "            INSERT INTO recording(timestamp, message)\n",
    "                VALUES (NOW(), CONCAT('Recording at ', \n",
    "                                      DATE_FORMAT(NOW(), '%r')));\n",
    "        END\n",
    "        \"\"\"\n",
    "      )\n",
    "\n",
    "cursor.execute(sql)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "8f35e5c6-9083-4b6f-aaf2-e4f2e0943f27",
   "metadata": {},
   "outputs": [],
   "source": [
    "cursor.close()\n",
    "conn.close()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "b77a2a70-71c8-4cb0-ba68-45ca2ba6e8e3",
   "metadata": {},
   "outputs": [],
   "source": []
  }
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