Student-Management-System/data_base.py at main · santhoshkm-dev/Student-Management-System · GitHub

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import sqlite3

# ----------------------------
# DATABASE CONNECTION
# ----------------------------

def get_connection():
    conn = sqlite3.connect("students.db")
    return conn


# ----------------------------
# CREATE TABLE
# ----------------------------

def create_table():

    conn = get_connection()
    cursor = conn.cursor()

    cursor.execute("""
    CREATE TABLE IF NOT EXISTS students(
        id INTEGER PRIMARY KEY,
        name TEXT,
        course TEXT,
        mark INTEGER
    )
    """)

    conn.commit()
    conn.close()


# ----------------------------
# ADD STUDENT
# ----------------------------

def add_student(student_id, name, course, mark):

    try:

        conn = get_connection()
        cursor = conn.cursor()

        cursor.execute(
            "INSERT INTO students VALUES (?, ?, ?, ?)",
            (student_id, name, course, mark)
        )

        conn.commit()
        conn.close()

        print("\n✅ Student added successfully")

    except sqlite3.IntegrityError:
        print("\n❌ ID already exists")


# ----------------------------
# SHOW STUDENTS
# ----------------------------

def show_students():

    conn = get_connection()
    cursor = conn.cursor()

    cursor.execute("SELECT * FROM students")

    data = cursor.fetchall()

    conn.close()

    return data


# ----------------------------
# SEARCH STUDENT
# ----------------------------

def search_student(name):

    conn = get_connection()
    cursor = conn.cursor()

    cursor.execute(
        "SELECT * FROM students WHERE name LIKE ?",
        (f"%{name}%",)
    )

    data = cursor.fetchall()

    conn.close()

    return data


# ----------------------------
# UPDATE STUDENT
# ----------------------------

def update_student(student_id, new_mark):

    conn = get_connection()
    cursor = conn.cursor()

    cursor.execute(
        "UPDATE students SET mark = ? WHERE id = ?",
        (new_mark, student_id)
    )

    conn.commit()

    if cursor.rowcount == 0:
        print("\n❌ Student not found")
    else:
        print("\n✅ Student updated")

    conn.close()


# ----------------------------
# DELETE STUDENT
# ----------------------------

def delete_student(student_id):

    conn = get_connection()
    cursor = conn.cursor()

    cursor.execute(
        "DELETE FROM students WHERE id = ?",
        (student_id,)
    )

    conn.commit()

    if cursor.rowcount == 0:
        print("\n❌ Student not found")
    else:
        print("\n✅ Student deleted")

    conn.close()