def test_delete():
# Get a session
session = get_db_session()
# Instantiate the Product DAO
prod = FlightDAO()
# Assign an product_id
flight_id = 1 # exists
#product_id = 5 # does not exist?
# Call the delete() method from the DAO
# and pass the pproduct_id as parameter - could pass it directly
result = prod.delete(session, flight_id)
# Print the result
print(result)
# Close the session
session.close()
class FlightGUI():
"""
This is used as an initialiser to be used to "instantiate" attributes of the class.
"""
def __init__(self):
self.flt_dao = FlightDAO()
self.validator = Validation()
self.flight_id = tk.IntVar()
self.airline_name = tk.StringVar()
self.from_location = tk.StringVar()
self.to_location = tk.StringVar()
self.depature_time = tk.IntVar()
self.arrival_time = tk.IntVar()
self.duration = tk.IntVar()
self.total_seats = tk.IntVar()
self.flight_price = tk.IntVar()
# List of employee ids - lb for listbox
self.lb_ids = None
# Messagebox title
self.mb_title_bar = "Employee CRUD"
pass
"""
Create a high level frame which contains the entire GUI
"""
def create_gui(self, root):
print("Creating employee GUI ...")
prod_frame = tk.Frame(root)
prod_frame.pack()
form_frame = tk.Frame(prod_frame)
form_frame.pack()
#Widgets
#Row 0 :title
tk.Label(form_frame, font=('arial', 10),
text = "Flights").grid(row=0, column=0, columnspan=3)
#row 1 :product_id label, product_id entry and list_of ids label
tk.Label(form_frame, text= "Flight Id", font=('arial', 10),
width=20, anchor="e", bd=1,
pady=10, padx=10).grid(row=1, column=0)
tk.Entry(form_frame, textvariable=self.flight_id, width=30, bd=1,
state=tk.DISABLED).grid(row=1, column=1)
tk.Label(form_frame, text= "Flight IDs",
font=('arial', 10)).grid(row=1, column=2)
self.lb_ids = tk.Listbox(form_frame)
self.lb_ids.grid(row=1, column=2, rowspan=6)
# Set the method to be called when an item is clicked on the listbox
self.lb_ids.bind('<<ListboxSelect>>', self.on_list_select)
#row 2 : product name label, product name entry
tk.Label(form_frame, text= "Airline Name", font=('arial', 10),
width=20, anchor="e", bd=1,
pady=10, padx=10).grid(row=2, column=0)
VALUES = ("Bob Airlines","Malaysia Airlines","Qantas Airlines")
combo_prod_cat = ttk.Combobox(form_frame, state="normal",textvariable=self.airline_name,
values=VALUES, width=20)
combo_prod_cat.grid(row=2, column=1, sticky="w")
#row 3 - Depature label, depature desc entry
tk.Label(form_frame, text= "Depature", font=('arial', 10),
width=20, anchor="e", bd=1,
pady=10, padx=10).grid(row=3, column=0)
VALUES = ("Tullamarine Airpot, Melbourne","Changi Airport, Singapore", "Sydney Airport,Sydney")
combo_prod_cat = ttk.Combobox(form_frame, state="normal",textvariable=self.from_location,
values=VALUES, width=20)
combo_prod_cat.grid(row=3, column=1, sticky="w")
#row 4 - Arrival label , arrival desc entry
tk.Label(form_frame, text= "Arrival", font=('arial', 10),
width=20, anchor="e", bd=1,
pady=10, padx=10).grid(row=4, column=0)
VALUES = ("Tullamarine Airpot, Melbourne","Changi Airport, Singapore", "Sydney Airport,Sydney")
combo_prod_cat = ttk.Combobox(form_frame, state="normal",textvariable=self.to_location,
values=VALUES, width=20)
combo_prod_cat.grid(row=4, column=1, sticky="w")
#row 5 - Depature time label, Depature time combobox
tk.Label(form_frame, text= "Depature Time", font=('arial', 10),
width=20, anchor="e", bd=1,
pady=10, padx=10).grid(row=5, column=0)
VALUES = (1530,2230,1430,1120)
combo_prod_cat = ttk.Combobox(form_frame, state="normal", textvariable=self.depature_time,
values=VALUES, width=10)
combo_prod_cat.grid(row=5, column=1, sticky="w")
#row 6 - Arrival time label, depature time combobox
tk.Label(form_frame, text= "Arrival Time", font=('arial', 10),
width=20, anchor="e", bd=1,
pady=10, padx=10).grid(row=6, column=0)
VALUES = (1530,2230,1430,1120)
combo_prod_cat = ttk.Combobox(form_frame, state="normal", textvariable=self.arrival_time,
values=VALUES, width=10)
combo_prod_cat.grid(row=6, column=1, sticky="w")
#row 7 - Duration label, duration time combobox
tk.Label(form_frame, text= "Duration", font=('arial', 10),
width=20, anchor="e", bd=1,
pady=10, padx=10).grid(row=7, column=0)
self.txt_prod_desc = tk.Entry(form_frame,textvariable=self.duration,width=30, bd=1)
self.txt_prod_desc.grid(row=7, column=1)
#row 8 - total seats label, total seats entry
tk.Label(form_frame, text= "Total Seats", font=('arial', 10),
width=20, anchor="e", bd=1,
pady=10, padx=10).grid(row=8, column=0)
self.txt_prod_desc = tk.Entry(form_frame, textvariable=self.total_seats,width=30, bd=1)
self.txt_prod_desc.grid(row=8, column=1)
#row 8 - total seats label, total seats entry
tk.Label(form_frame, text= "Price", font=('arial', 10),
width=20, anchor="e", bd=1,
pady=10, padx=10).grid(row=9, column=0)
self.txt_prod_desc = tk.Entry(form_frame, textvariable=self.flight_price,width=30, bd=1)
self.txt_prod_desc.grid(row=9, column=1)
button_frame = tk.Frame(prod_frame, pady=20)
button_frame.pack()
tk.Button(button_frame, width=10, text="Clear",
command=self.clear_fields).pack(side=tk.LEFT)
tk.Button(button_frame, width=10, text="Save",
command=self.save).pack(side=tk.LEFT)
tk.Button(button_frame, width=10, text="Delete",
command=self.delete).pack(side=tk.LEFT)
tk.Button(button_frame, width=10, text="Load",
command=self.load).pack(side=tk.LEFT)
return prod_frame
"""
Clears all the fields of the form
"""
def clear_fields(self):
# Just blank all the fields
self.flight_id.set("")
#self.airline_name.set("")
#self.from_location.set("")
#self.title.set("") # Do not clear if using dropdown
#self.to_location.set("")
#self.depature_time.set("")
#self.arrival_time.set("")
self.duration.set("")
self.total_seats.set("")
self.flight_price.set("")
pass
"""
Save the data displayed on the form to the database
"""
def save(self):
print("Saving a flight ...")
# Get the data
data = self.get_fields()
# Validate the data
valid_data, message = self.validate_fields(data)
if valid_data:
if (data['flight_id']==0):
# If nothing has been entered in employee_id
# i.e. its length is zero characters
print("Calling create() as flight_id is absent")
self.create(data)
else:
print("Calling update() as flight_id is present")
self.update(data)
pass
else:
message_text = "Invalid fields.\n" + message
messagebox.showwarning(self.mb_title_bar, message_text, icon="warning")
pass
"""
Get the data entered in the fields of the form
"""
def get_fields(self):
emp = {}
# employee_id is ignored when creating a record
emp['flight_id'] = self.flight_id.get()
emp['airline_name'] = self.airline_name.get()
emp['from_location'] = self.from_location.get()
emp['to_location'] = self.to_location.get()
emp['depature_time'] = self.depature_time.get()
emp['arrival_time'] = self.arrival_time.get()
emp['duration'] = self.duration.get()
emp['total_seats'] = self.total_seats.get()
emp['flight_price'] = self.flight_price.get()
return emp
"""
Validate the data entered in the fields of the form
"""
def validate_fields(self, data):
# By default set to true, anything wrong will turn it to false
valid_data = True
# Instantiate an empty list to contain the messages
message_list = []
# Check for blank fields
# Do not check employee_id as this is generated by the database
#if len(data['employee_id']==0:
# valid_data = False
# message_list.append("employee_id is empty")
if len(data['airline_name'])==0:
valid_data = False
message_list.append("airline_name is empty")
if len(data['from_location'])==0:
valid_data = False
message_list.append("from_location is empty")
if len(data['to_location'])==0:
valid_data = False
message_list.append("to_location is empty")
if len(str(data['depature_time']))==0:
valid_data = False
message_list.append("depature_time is empty")
if len(str(data['arrival_time']))==0:
valid_data = False
message_list.append("arrival_time is empty")
if len(str(data['duration']))==0:
valid_data = False
message_list.append("duration is empty")
if len(str(data['total_seats']))==0:
valid_data = False
message_list.append("total_seats is empty")
if len(str(data['flight_price']))==0:
valid_data = False
message_list.append("flight_price is empty")
# Join the items in the list as a string separated with a comma and a space
message = ', '.join(message_list)
return valid_data, message # return 2 values
"""
Create a new record in the database.
"""
def create(self, data):
print("Creating a flight ...")
print(data)
session = db.get_db_session() # Get a session (database.py)
result = self.flt_dao.create(session, data)
# result is a tuple e.g. ("Employee added successfully", 1004)
#result, employee_id = self.emp.create(data)
# if you wish to get the message and employee_id separately
session.close() # Close the session
messagebox.showinfo(self.mb_title_bar, result)
pass
"""
Create a new record in the database.
"""
def update(self, data):
print("Updating flight ...")
print(data)
session = db.get_db_session() # Get a session (database.py)
result = self.flt_dao.update(session, data['flight_id'], data)
session.close() # close the session
# Display the returned message to the user - use a messagebox
# Display everything that is returned in the result
messagebox.showinfo(self.mb_title_bar, result)
pass
"""
Delete a record in the database
"""
def delete(self):
# Grab the employee_id from the stringvar
id = self.flight_id.get()
print(id)
# Call the data access object to do the job
# Pass the id as parameter to the delete() method
session = db.get_db_session() # Get a session (database.py)
result = self.flt_dao.delete(session, id)
session.close() # Close the session
# Display the returned message to the user - use a messagebox
# Display everything that is returned in the result
messagebox.showinfo(self.mb_title_bar, result)
pass
"""
load records in the database
"""
def load(self):
session = db.get_db_session() # Get a session (database.py)
result = self.flt_dao.find_ids(session) # {"employee_ids": [1, 2, 3]}
session.close() # Close the session
print("result", result)
# Check if there is an entry in the result dictionary
if "flight_ids" in result:
list_ids = result['flight_ids']
self.lb_ids.delete(0,tk.END)
print("Setting flight_id in listbox ...")
for x in list_ids:
self.lb_ids.insert(tk.END, x)
#print(x)
pass
"""
on_list_select() is triggered when a user clicks an item in the listbox.
"""
def on_list_select(self, evt):
"""
on_list_select() is triggered when a user clicks an item in the listbox.
This was defined with the statement
"self.lb_ids.bind('<<ListboxSelect>>', self.on_list_select)"
defined above in create_gui()
Parameters (apart from self):
evt: object containing information about the mouse click
Return: None
"""
# For more information on 'tkinter events',
# refer to http://effbot.org/tkinterbook/tkinter-events-and-bindings.htm
w = evt.widget
index = int(w.curselection()[0])
# index = position of the item clicked in the list, first item is item 0 not 1
value = w.get(index)
# value of the item clicked, in our case it's the employee_id
print(index)
print(value)
# Call find_by_id and populate the stringvars of the form
session = db.get_db_session() # Get a session (database.py)
result = self.flt_dao.find_by_id(session, value)
session.close() # close the session
print("result", result)
# { "employee" : {"employee_id": "", "firstname": "", etc}}
emp = result['flight']
self.populate_fields(emp)
pass
"""
Populate the fields of the form with data
"""
def populate_fields(self, emp):
# Set the values from the dict to the stringvars
self.flight_id.set(emp['flight_id'])
self.airline_name.set(emp['airline_name'])
self.from_location.set(emp['from_location'])
self.to_location.set(emp['to_location'])
self.depature_time.set(emp['depature_time'])
self.arrival_time.set(emp['arrival_time'])
self.duration.set(emp['duration'])
self.total_seats.set(emp['total_seats'])
self.flight_price.set(emp['flight_price'])
pass