$ pip install flask-sqlalchemy 

$ import flask_sqlalchemy 

   
      
Add new Employee
      

      
      {%- for category, message in get_flashed_messages(with_categories = true) %}
         

            {{ message }}
         
      {%- endfor %}
      
      

         Name

         

 
         Salary

         

         
         Age

         

         
         Pin

         

         
         
      
   

   
   
      

         Employee Management System
      
      
      

      {%- for message in get_flashed_messages() %}
         {{ message }}
      {%- endfor %}
        
      
Employees List
      
            {% for employee in Employees %}
               
            {% endfor %}
         

         

            

               
Name
               
Salary
               
Age
               
Pin
            
         

         

                  
{{ employee.name }}
                  
{{ employee.salary }}
                  
{{ employee.age }}
                  
{{ employee.pin }}
               
      
      


      Add New Employee
   

from flask import Flask, request, flash, url_for, redirect, render_template
from flask_sqlalchemy import SQLAlchemy

app = Flask(__name__)
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///employees.sqlite3'
app.config['SECRET_KEY'] = "secret key"

db = SQLAlchemy(app)

class Employees(db.Model):
   id = db.Column('employee_id', db.Integer, primary_key = True)
   name = db.Column(db.String(100))
   salary = db.Column(db.Float(50))
   age = db.Column(db.String(200)) 
   pin = db.Column(db.String(10))

   def __init__(self, name, salary, age,pin):
      self.name = name
      self.salary = salary
      self.age = age
      self.pin = pin

@app.route('/')
def list_employees():
   return render_template('list_employees.html', Employees = Employees.query.all() )

@app.route('/add', methods = ['GET', 'POST'])
def addEmployee():
   if request.method == 'POST':
      if not request.form['name'] or not request.form['salary'] or not request.form['age']:
         flash('Please enter all the fields', 'error')
      else:
         employee = Employees(request.form['name'], request.form['salary'],
            request.form['age'], request.form['pin'])
         
         db.session.add(employee)
         db.session.commit()
         flash('Record was successfully added')
         return redirect(url_for('list_employees'))
   return render_template('add.html')

if __name__ == '__main__':
   db.create_all()
   app.run(debug = True)