Database Connection with Python using MSSQL_Server

Author: PatilNi3

mssqlserver.ipynb

@@ -0,0 +1,185 @@
+{
+ "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": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "server = 'your_server_name'\n",
+    "database = 'your_database_name'\n",
+    "username = 'your_username'\n",
+    "password = 'your_password'"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "**3. Create the Connection String:**"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "conn_str = (\n",
+    "    r'DRIVER={ODBC Driver 17 for SQL Server};'\n",
+    "    r'SERVER=' + server + ';'\n",
+    "    r'DATABASE=' + database + ';'\n",
+    "    r'UID=' + username + ';'\n",
+    "    r'PWD=' + password\n",
+    ")"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "**4. Connect to the Database:**"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "try:\n",
+    "    conn = pyodbc.connect(conn_str)\n",
+    "    print(\"Connected to the database successfully!\")\n",
+    "    \n",
+    "    # Create a cursor object to interact with the database\n",
+    "    cursor = conn.cursor()\n",
+    "\n",
+    "    # Example: Query the database\n",
+    "    cursor.execute('SELECT @@VERSION')\n",
+    "    row = cursor.fetchone()\n",
+    "    print(\"Database version:\", row[0])\n",
+    "\n",
+    "    # Example: Insert data into a table\n",
+    "    cursor.execute(\"INSERT INTO users (name) VALUES ('John Doe')\")\n",
+    "    conn.commit()  # Commit the transaction\n",
+    "\n",
+    "    # Example: Retrieve data\n",
+    "    cursor.execute(\"SELECT * FROM users\")\n",
+    "    rows = cursor.fetchall()\n",
+    "    for row in rows:\n",
+    "        print(row)\n",
+    "\n",
+    "except Exception as e:\n",
+    "    print(f\"Error: {e}\")\n",
+    "\n",
+    "finally:\n",
+    "    # Always close the connection after use\n",
+    "    if conn:\n",
+    "        conn.close()"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "**5. Querying:**"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "cursor.execute('SELECT * FROM your_table_name')\n",
+    "\n",
+    "rows = cursor.fetchall()\n",
+    "\n",
+    "for row in rows:\n",
+    "    print(row)"
+   ]
+  }
+ ],
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