Database Connection using pyodbc

Author: PatilNi3

mssqlserver.ipynb

@@ -0,0 +1,233 @@
+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "A database connection is essential for allowing your application (such as a Python program) to interact with a database. Without a connection, your program wouldn't be able to read, write, or manipulate data stored in the database. Here are some of the key reasons why a database connection is needed:\n",
+    "\n",
+    "1. Data Storage and Retrieval\n",
+    "2. Enabling SQL Queries\n",
+    "3. Transaction Management\n",
+    "4. Concurrency and Multi-user Access\n",
+    "5. Security and Authentication\n",
+    "6. Efficiency and Performance\n",
+    "7. Data Integrity and Consistency\n",
+    "8. Communication Between Application and Database\n",
+    "9. Managing Complex Queries and Relationships\n",
+    "10. External Applications and APIs"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "To connect to a database using Python, you'll need to use a database connector or driver specific to the type of database you're working with (e.g., SQLite, MySQL, PostgreSQL).\n",
+    "\n",
+    "**1. Import required library:** To connect to a Microsoft SQL Server (MSSQL) database from Python, you can use the pyodbc library or pymssql. The most common choice is pyodbc because it provides a flexible and powerful way to work with MSSQL databases."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Requirement already satisfied: pyodbc in c:\\users\\91960\\machine learning\\database connection\\database_connection\\lib\\site-packages (5.2.0)\n"
+     ]
+    },
+    {
+     "name": "stderr",
+     "output_type": "stream",
+     "text": [
+      "\n",
+      "[notice] A new release of pip is available: 23.2.1 -> 24.3.1\n",
+      "[notice] To update, run: python.exe -m pip install --upgrade pip\n"
+     ]
+    }
+   ],
+   "source": [
+    "!pip install pyodbc\n",
+    "import pyodbc"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "**2. Define your connection parameter:** "
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 20,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "server = 'NITIN'\n",
+    "database = 'DB_Connection'"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "**3. Create the Connection String:**"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 21,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "conn = pyodbc.connect(f'DRIVER={{ODBC Driver 17 for SQL Server}};'\n",
+    "                      f'SERVER={server};'\n",
+    "                      f'DATABASE={database};'\n",
+    "                      f'Trusted_Connection=yes')"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "**4. Creating a Cursor:**"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 22,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "cursor = conn.cursor()"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "**5. Creating a Table:**"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 23,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Table Created Successfully.\n"
+     ]
+    }
+   ],
+   "source": [
+    "cursor.execute('CREATE TABLE Testing_Connection (Test_ID INT, Test_Name VARCHAR(50))')\n",
+    "\n",
+    "conn.commit()\n",
+    "\n",
+    "print(\"Table Created Successfully.\")"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "**6. Inserting Data to the Table:**"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 24,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "Row Inserted.\n"
+     ]
+    }
+   ],
+   "source": [
+    "cursor.execute(\"INSERT INTO Testing_Connection (test_ID, Test_Name) VALUES (1, 'Nitin Testing')\")\n",
+    "\n",
+    "conn.commit()\n",
+    "\n",
+    "print('Row Inserted.')"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "**7. Fetch and Display Results:**"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 26,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "(1, 'Nitin Testing')\n"
+     ]
+    }
+   ],
+   "source": [
+    "cursor.execute(\"SELECT * FROM Testing_Connection\")\n",
+    "\n",
+    "rows = cursor.fetchall()\n",
+    "\n",
+    "for row in rows:\n",
+    "    print(row)"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "**8. Close Cursor and Connection:**"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "cursor.close()\n",
+    "conn.close()"
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "database_connection",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.12.1"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 2
+}