Added mysql connectivity.

Practical/Practical Exam/Connectivity/C2 - MySQL Connectivity.md

@@ -0,0 +1,102 @@
+# C1 - MySQL Connectivity
+
+**Problem Statement:** Implement MYSQL/Oracle database connectivity with PHP /python /Java Implement Database navigation operations (add, delete, edit,).
+
+---
+
+## Pre-requisites (with installation command for Ubuntu):
+
+1. Python3 - `sudo apt install python3`
+2. pip - `sudo apt install pip`
+3. mysql-connector -  `pip3 install mysql-connector` OR `pip3 install mysql-connector --break-system-packages` (installs it system-wide)
+
+## Instructions
+
+1. First, open the Terminal and log in to MySQL:
+```shell
+mysql -u root -p
+
+```
+
+> [!NOTE]
+> Usually the password in our labs is `root`. If you don't know the password, try running `sudo mysql`. This will run the `mysql` command as root.
+
+2. Whether you logged in as root or not, run this command to set the password for `root` user in mysql which is required for connecting to the database:
+```sql
+ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'root';
+FLUSH PRIVILEGES;
+```
+
+3. Now, in MySQL we need to initialize the database and tables:
+```sql
+-- Creating the database
+CREATE DATABASE connectMe;
+USE connectMe;
+
+-- Creating a table
+CREATE TABLE students (
+  roll INT,
+  name VARCHAR(255)
+);
+
+-- Exit
+exit
+
+```
+
+> We need to `exit` from MySQL shell since the work there is done for now.
+
+5. Create a new file `connectSQL.py` with the following contents:
+```python
+import mysql.connector
+# Connecting to MySQL database
+db = mysql.connector.connect(
+  host="localhost",
+  user="root",
+  password="root", # Password of root user we set in step 2
+  database="connectMe" # Name of the database we created in step 3
+)
+
+Cursor = db.cursor()
+
+sqlInsert = "INSERT INTO students (roll, name) VALUES (21, 'Stewie')" # insert operation
+Cursor.execute(sqlInsert)
+print(Cursor.rowcount, "record added to database.")
+
+Cursor.execute(sqlInsert)
+sqlInsert = "INSERT INTO students (roll, name) VALUES (22, 'Foxy')" # insert operation
+print(Cursor.rowcount, "record added to database.")
+
+sqlUpdate = "UPDATE students SET roll = 21  WHERE roll = 20"
+Cursor.execute(sqlUpdate)
+print(Cursor.rowcount, "record updated.")
+
+sqlDelete = "DELETE FROM students WHERE roll = 20"
+Cursor.execute(sqlDelete)
+print(Cursor.rowcount, "record deleted.")
+
+db.commit()
+Cursor.close()
+db.close()
+
+```
+
+6. Open Terminal and run the above program:
+```shell
+python3 connectSQL.py
+```
+
+> [!NOTE]
+> This step assume you have stored the file in home directory or you know how to change the current working directory.
+
+7. That's it! You can view the changes in MySQL by logging in using `mysql -u root -p` (Password: `root`) and viewing the table:
+```sql
+USE connectMe;
+SELECT * FROM students;
+
+```
+
+> [!WARNING]
+> Never use `root` as password in production. Use a strong password. This guide uses `root` as password for simplicity and educational purposes.
+
+---

Practical/Practical Exam/README.md

@@ -10,7 +10,7 @@ This folder contains all the problem statements expected for practical examinati
 - [SQL](https://git.kska.io/sppu-te-comp-content/DatabaseManagementSystems/src/branch/main/Practical/Practical%20Exam/SQL) // 9 problem statements
 - [PL-SQL](https://git.kska.io/sppu-te-comp-content/DatabaseManagementSystems/src/branch/main/Practical/Practical%20Exam/PL-SQL) // 10 problem statements
 - [MongoDB](https://git.kska.io/sppu-te-comp-content/DatabaseManagementSystems/src/branch/main/Practical/Practical%20Exam/MongoDB) // 6 problem statements
-- [Connectivity]() // coming soon
+- [Connectivity](https://git.kska.io/sppu-te-comp-content/DatabaseManagementSystems/src/branch/main/Practical/Practical%20Exam/Connectivity) // 2 problem statements
 
 ---