AppliedMachineAndDeepLearning2023/CPS_Database_Basics.ipynb

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    "%%html\n",
    "<style>\n",
    "table {float:left}\n",
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    "<div>\n",
    "<img src=\"https://cps.unileoben.ac.at/wp/CPS_Logo_Black.png\" width=\"260\"/>\n",
    "</div>\n",
    "Chair of Cyber-Physical-Systems, Austria"
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    "\n",
    "| Credentials |  |\n",
    "|----|---|\n",
    "|Host | Montanuniversitaet Leoben |\n",
    "|Web | https://cps.unileoben.ac.at |\n",
    "|Mail | cps@unileoben.ac.at |\n",
    "|Authors | Vedant Dave, Fotis Lygerakis, Linus Nwankwo, Melanie Neubauer, Nikolaus Feith and Elmar Rueckert|\n",
    "|Corresponding Authors | melanie.neubauer@unileoben.ac.at, rueckert@unileoben.ac.at |\n",
    "|Last edited |  28.09.2023 |\n"
   ]
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   "source": [
    "# Python Database Basics"
   ]
  },
  {
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   "metadata": {},
   "source": [
    "<div class=\"alert alert-block alert-success\">\n",
    "This is a tutorial on the basics of using databases in Python."
   ]
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    "## Content\n",
    "***\n",
    "[1. Motivation for learning Python?](#sec:whypython)   \n",
    "\n",
    "[2. Database Overview](#sec:overview)\n",
    "\n",
    "[3. Database Example in Python](#sec:example)"
   ]
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   "source": [
    "# <a id=\"sec:whypython\">1. Motivation for Learning Python?</a>\n",
    "....\n",
    "    \n",
    "<div>\n",
    "<img src=\"https://cps.unileoben.ac.at/wp/statistics_2023_programming_language.png\" width=\"600\"/>\n",
    "</div>\n",
    "\n"
   ]
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    "# <a id=\"sec:overview\">2. Database Overview?</a> \n",
    "\n",
    "|  | MariaDB | InfluxDB | PostgreSQL | Graphite | TimescaleDB |\n",
    "|:--------:|:--------:|:--------:|:--------:|:--------:|:--------:|\n",
    "|  Type   |  Relational| Time Series |  Relational |  Time Series |  Time Series |\n",
    "|  Language |  SQL   |  InfluxQL |  SQL |  Graphite Query |  ---   |\n",
    "|  Scalable |  Good   |  Good   |  Good  |  Lose Performance when saving a big amound of data |  Very Good  |\n",
    "|  Replication |  Yes   |  Yes   |  Yes  |  No |  Yes  |\n",
    "|  High-Availability |  Yes   |  Yes   |  Yes  |  No |  Yes  |\n",
    "|  Data-Transformation |  Limited   |  Yes   |  Yes  |  Yes |  Yes  |\n",
    "|  Community-Support Python |  Good   |  OK   | --- |  --- |  ---  |\n",
    "|  Compression |  Yes   |  Yes   |  Yes  |  Yes |  Yes  |\n",
    "|  Partitioning |  Yes   |  Yes   |  Yes  |  No |  Yes  |\n",
    "|  Image Saving |  BLOB or BYTEA   |  No   |  BLOB or BYTEA  |  No |  BLOB or BYTEA  |\n",
    "|  Python |  Mysql-connector-python   |  Influxdb-python   |  psycopg2  |  No |  psycopg2, timescaledb  |\n",
    "|  Integrated Graphics |  No (connect with Grafana)   |  Yes   |  No  |  Yes |  Yes  |\n"
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   "source": [
    "# <a id=\"sec:example\">3. Database Example in Python</a> \n",
    "## Create new Database (open existing Database)"
   ]
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   "execution_count": 15,
   "id": "974c33a4",
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   "source": [
    "# Import\n",
    "import sqlite3"
   ]
  },
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   "id": "06024e10-c790-4e7f-b4d2-717f2f8c1826",
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   "source": [
    "# Set the Path of the Database\n",
    "database_path = 'example_database.db'"
   ]
  },
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   "execution_count": 48,
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   "source": [
    "# Create connection to the SQLite-Database\n",
    "db_conn = sqlite3.connect(database_path)\n",
    "db_cursor = db_conn.cursor()"
   ]
  },
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   "source": [
    "## Create Table in Database"
   ]
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   "source": [
    "# Create a Table in Database\n",
    "db_cursor.execute('''\n",
    "            CREATE TABLE IF NOT EXISTS students (\n",
    "                m_number INTEGER PRIMARY KEY,\n",
    "                name TEXT,\n",
    "                age INTEGER\n",
    "                )\n",
    "                ''')\n",
    "db_conn.commit()"
   ]
  },
  {
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   "id": "88e7e045-8ab1-498d-b928-3e0fe51ca624",
   "metadata": {},
   "source": [
    "## Create Entry in Database"
   ]
  },
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   "source": [
    "# Create two entries for students\n",
    "student_1 = (123456789, 'Josef', 20)\n",
    "student_2 = (987654321, 'Sissi', 33)\n",
    "\n",
    "db_cursor.execute(f'''INSERT INTO students VALUES ({student_1[0]}, '{student_1[1]}', {student_1[2]})''')\n",
    "db_cursor.execute(f'''INSERT INTO students VALUES ({student_2[0]}, '{student_2[1]}', {student_2[2]})''')\n",
    "db_conn.commit()"
   ]
  },
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   "metadata": {},
   "source": [
    "## Show Table from Database"
   ]
  },
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    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "(987654321, 'Sissi', 33)\n"
     ]
    }
   ],
   "source": [
    "# Print each row of the table students in the database\n",
    "for row in db_cursor.execute('''SELECT * FROM students'''):\n",
    "    print(row)"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "d7e72081-859f-4c19-9393-92c2f6e72b57",
   "metadata": {},
   "source": [
    "## Search for Entry in Table"
   ]
  },
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   "cell_type": "code",
   "execution_count": 39,
   "id": "b29460b0-d7e4-47d5-b65e-eb3aac352648",
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    {
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     "output_type": "stream",
     "text": [
      "[]\n"
     ]
    }
   ],
   "source": [
    "# Search for Student with the m_number 123456789\n",
    "db_cursor.execute(f'''SELECT name, age FROM students WHERE m_number = {123456789}''')\n",
    "result = db_cursor.fetchall()\n",
    "print(result)"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "53a5f8d1-3444-48f1-80a4-87db8cb3858c",
   "metadata": {},
   "source": [
    "## Delete Entry from Table"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 38,
   "id": "6248e45a-6cd9-42bb-9f30-ee979a8865a3",
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   "outputs": [],
   "source": [
    "# Delete Student with the m_number 123456789 from the Database\n",
    "db_cursor.execute(f'''DELETE FROM students WHERE m_number = {123456789}''')\n",
    "db_conn.commit()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 44,
   "id": "5c675bc4-6528-424a-88df-0023cc79eb29",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "(987654321, 'Sissi', 33)\n"
     ]
    }
   ],
   "source": [
    "# Now you can show the table again\n",
    "# Print each row of the table students in the database\n",
    "for row in db_cursor.execute('''SELECT * FROM students'''):\n",
    "    print(row)"
   ]
  },
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   "cell_type": "markdown",
   "id": "119cc9ce-b361-4ccc-892b-98cb635ad6d5",
   "metadata": {},
   "source": [
    "## Close Database Connection"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 51,
   "id": "24cacc8f-ba78-4768-a4cb-425c9c9ca7f3",
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   "source": [
    "# After using, always close the connection to the database\n",
    "db_conn.close()"
   ]
  },
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