SQLAlchemy beginner tutorial

Author: OmkarPathak

Programs/P80_SQLAlchemyTutorial.py

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+# Author: OMKAR PATHAK
+# This is a simple tutorial on usinng SQLAlchemy as ORM (Object Relational Mapping)
+
+# Make sure you have installed SQLAlchemy using: pip3 install sqlalchemy
+
+from sqlalchemy import (
+    create_engine,
+    Column,
+    Integer,
+    String
+)
+
+from sqlalchemy.ext.declarative import declarative_base
+from sqlalchemy.orm import sessionmaker
+import os
+
+
+# create a sqlite db
+engine = create_engine('sqlite:///example.db', echo=True)
+Base = declarative_base()
+
+
+class Student(Base):
+    __tablename__ = "student"
+
+    id = Column(Integer, primary_key=True)
+    username = Column(String)
+    firstname = Column(String)
+    lastname = Column(String)
+    university = Column(String)
+
+    def __init__(self, username, firstname, lastname, university):
+        self.username = username
+        self.firstname = firstname
+        self.lastname = lastname
+        self.university = university
+
+
+def create_tables():
+    # create tables
+    Base.metadata.create_all(engine)
+
+
+if __name__ == '__main__':
+    sqlite_file = 'example.db'
+    file_exists = os.path.isfile(sqlite_file)
+    if not file_exists:
+        create_tables()
+    Session = sessionmaker(bind=engine)
+    session = Session()
+
+    # Create objects
+    user = Student('OmkarPathak', 'Omkar', 'Pathak', 'MIT')
+    session.add(user)
+
+    # commit the record the database
+    session.commit()
+
+    # Select objects
+    for student in session.query(Student).order_by(Student.id):
+        print (student.firstname, student.lastname)