Added SQLAlchemy (part 1) blog sample

mariadb_python_sqlalchemy/part_1/employees.py

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+import sqlalchemy
+from sqlalchemy.ext.declarative import declarative_base
+
+# Define the MariaDB engine using MariaDB Connector/Python
+engine = sqlalchemy.create_engine("mariadb+mariadbconnector://app_user:Password123!@127.0.0.1:3306/company")
+
+Base = declarative_base()
+
+class Employee(Base):
+    __tablename__ = 'employees'
+    id = sqlalchemy.Column(sqlalchemy.Integer, primary_key=True)
+    firstname = sqlalchemy.Column(sqlalchemy.String(length=100))
+    lastname = sqlalchemy.Column(sqlalchemy.String(length=100))
+    active = sqlalchemy.Column(sqlalchemy.Boolean, default=True)
+
+Base.metadata.create_all(engine)
+
+# Create a session
+Session = sqlalchemy.orm.sessionmaker()
+Session.configure(bind=engine)
+session = Session()
+
+def addEmployee(firstName,lastName):
+    newEmployee = Employee(firstname=firstName, lastname=lastName)
+    session.add(newEmployee)
+    session.commit()
+
+def selectAll():
+    employees = session.query(Employee).all()
+    for employee in employees:
+        print(" - " + employee.firstname + ' ' + employee.lastname)
+
+def selectByStatus(isActive):
+    employees = session.query(Employee).filter_by(active=isActive)
+    for employee in employees:
+        print(" - " + employee.firstname + ' ' + employee.lastname)
+
+def updateEmployeeStatus(id, isActive):
+    employee = session.query(Employee).get(id)
+    employee.active = isActive
+    session.commit()
+
+def deleteEmployee(id):
+    session.query(Employee).filter(Employee.id == id).delete()
+    session.commit()
+
+# Add some new employees
+addEmployee("Bruce", "Wayne")
+addEmployee("Diana", "Prince")
+addEmployee("Clark", "Kent")
+
+# Show all employees
+print('All Employees')
+selectAll()
+print("----------------")
+
+# Update employee status
+updateEmployeeStatus(2,False)
+
+# Show active employees
+print('Active Employees')
+selectByStatus(True)
+print("----------------")
+
+# Delete employee
+deleteEmployee(1)
+
+# Show all employees
+print('All Employees')
+selectAll()
+print("----------------")