115 lines
3.8 KiB
Plaintext
115 lines
3.8 KiB
Plaintext
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{
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"cells": [
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{
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"cell_type": "code",
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"execution_count": null,
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"metadata": {},
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"outputs": [],
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"source": [
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"\"\"\"\n",
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"The module optimize_query contains a function which sends the query\n",
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"to Optimizer to be optimized and returns the optimized query back.\n",
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"\"\"\"\n",
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"import asyncio\n",
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"import nest_asyncio\n",
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"nest_asyncio.apply()\n",
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"\n",
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"from libs_pkg.exception_handler import *\n",
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"\n",
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"async def opt_comm_exec(reader, writer, query, db_name, flag):\n",
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" \"\"\"\n",
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" This function sends the query to Optimizer to be optimized and returns the optimized query back.\n",
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" \n",
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" :param reader: The stream reader of the connection to Optimizer.\n",
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" :param writer: The stream writer of the connection to Optimizer.\n",
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" :param query: The query to be optimized given as string.\n",
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" :param db_name: The The currently open database related to the given query.\n",
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" :param flag: The boolean value that shows if the command should be executed by optimizer (True) or should be optimized (False).\n",
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" \n",
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" :return: The optimized query as string.\n",
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" \"\"\"\n",
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" \n",
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" if reader == None or writer == None:\n",
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" raise SecondoAPI_Error('Connection to Optimizer reset.')\n",
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" else:\n",
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" \n",
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" #execute query\n",
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" if flag:\n",
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" writer.write(b'<execute>\\n')\n",
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" \n",
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" #optimize query\n",
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" else: \n",
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" writer.write(b'<optimize>\\n')\n",
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" \n",
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" writer.write(b'<database>\\n')\n",
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" db_name += \"\\n\"\n",
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" writer.write(db_name.encode())\n",
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" \n",
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" writer.write(b'</database>\\n')\n",
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" \n",
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" writer.write(b'<query>\\n')\n",
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" query += \"\\n\"\n",
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" writer.write(query.encode())\n",
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" \n",
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" writer.write(b'</query>\\n')\n",
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" \n",
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" if flag:\n",
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" writer.write(b'</execute>\\n')\n",
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" \n",
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" else: \n",
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" writer.write(b'</optimize>\\n')\n",
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" \n",
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" await writer.drain()\n",
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" \n",
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" res = await reader.readline()\n",
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" res = res.decode()\n",
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" if not res:\n",
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" raise SecondoAPI_Error(\"Connection to Optimizer is broken.\")\n",
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" if res != \"<answer>\\n\":\n",
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" raise SecondoError(\"Wrong Data received from Optimizer.\")\n",
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" res = await reader.readline()\n",
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" res = res.decode()\n",
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" if not res:\n",
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" raise SecondoAPI_Error('Connection to Optimizer is broken.')\n",
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" opt_res = \"\"\n",
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" count = 3\n",
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" while res != \"</answer>\\n\":\n",
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" if flag:\n",
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" opt_res += res\n",
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" else:\n",
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" opt_res += res.replace(\" \\n\", \"\")\n",
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" res = await reader.readline()\n",
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" res = res.decode()\n",
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" count += 1\n",
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" if not res:\n",
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" raise SecondoAPI_Error('Connection to Optimizer is broken.')\n",
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" \n",
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" if opt_res == \"\":\n",
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" raise SecondoAPI_Error('Optimization failed due to some Errors in the query.')\n",
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" return opt_res"
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]
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}
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],
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"metadata": {
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"kernelspec": {
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"display_name": "Python 3",
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"language": "python",
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"name": "python3"
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},
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"language_info": {
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"codemirror_mode": {
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"name": "ipython",
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"version": 3
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},
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"file_extension": ".py",
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"mimetype": "text/x-python",
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"name": "python",
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"nbconvert_exporter": "python",
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"pygments_lexer": "ipython3",
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"version": "3.7.4"
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}
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},
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"nbformat": 4,
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"nbformat_minor": 2
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}
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