Im trying to populate my SelectFormField 'College' and 'Courses' using data from my database. I want the options in the courses to change based on the selected college (e.g. College = College of Engineering and Technology, Courses = BS mechanical eng., BS Civil eng. and etc...
this is my attempt
class StudentForm(FlaskForm):
image = FileField('Choose an Image', validators=[FileAllowed(['jpg', 'jpeg', 'png'], 'Images only!'),])
IDN = StringField('ID',[validators.DataRequired(), validators.Length(min=9, max=9)])
Fname = StringField('First Name', [validators.DataRequired()])
Mname = StringField('Middle Name', [validators.DataRequired()])
Lname = StringField('Last Name', [validators.DataRequired()])
Gender = SelectField('Gender', choices=gen, validators=[Optional()])
Year_Level = SelectField('Year Level', choices=year_level, validators=[DataRequired()])
College = SelectField('College',choices =[], validate_choice=False)
Courses = SelectField('Courses',choices =[], validate_choice=False)
Submit = SubmitField('ADD')
def __init__(self):
super(StudentForm, self).__init__()
self.College.choices = self.get_colleges()
self.Courses.choices = self.get_courses()
def get_colleges(self):
conn = mysql.connection
curs = conn.cursor()
sql = "SELECT id FROM college"
curs.execute(sql)
result = curs.fetchall()
conn.commit()
curs.close()
colleges = [("", "")] + [(str(r[0]), r[0]) for r in result]
print(colleges)
return colleges
def get_courses(self):
selected_college = self.College.data
print(selected_college)
if selected_college:
conn = mysql.connection
curs = conn.cursor()
sql = "SELECT courses.id FROM courses JOIN college ON courses.college_id = college.id WHERE college.id = %s"
curs.execute(sql, (selected_college,))
result = curs.fetchall()
conn.commit()
curs.close()
courses = [(str(r[0]), r[0]) for r in result]
return courses
else:
return []
The problem is that the selected college in the get_courses is none and I don't know any other way to pass the currently selected college to the get_courses. Any help is appreciated.
Related
This code gets the category from users input in film_list table and gets IDs of all the movies with that category:
kategorija=input("Enter the category: ")
c.execute("SELECT DISTINCT FID FROM film_list WHERE category=?", (kategorija,))
filmid = c.fetchall()
print(filmid)
I'm trying to get a name and the release year of the film with the ID that we got in a previous code fragment.
result = []
for a in filmid:
c.execute("SELECT title,release_year FROM film WHERE film_id = 'a'")
result.append(c.fetchone())
print(result)
When I enter any number, for example 1, it returns what I need, so I suppose there's something wrong in the declaration of film_id, but I don't know how I can solve this.
Full code:
import sqlite3
#Connectin to DB
conn = sqlite3.connect('sakila.db')
c = conn.cursor()
#Checking if the connection to the DB is successful
if (conn):
print("Connection successful")
else:
print ("Connection unsuccessful")
kategorija=input("Enter the category: ")
c.execute("SELECT DISTINCT FID FROM film_list WHERE category=?", (kategorija,))
filmid = c.fetchall()
print(filmid)
result = []
for a in filmid:
c.execute("SELECT title,release_year FROM film WHERE film_id = 'a'")
result.append(c.fetchone())
print(result)
You may use the following single query:
SELECT f.title, f.release_year
FROM film f
INNER JOIN film_list fl ON fl.fid = f.film_id
WHERE fl.category = ?
Your updated Python code:
sql = '''SELECT f.title, f.release_year
FROM film f
INNER JOIN film_list fl ON fl.fid = f.film_id
WHERE fl.category = ?'''
kategorija = input("Enter the category: ")
result = []
c.execute(sql, (kategorija,))
result.append(c.fetchAll())
print(result)
The function queries transactions from a database. I'm able to get them to work individually. Is there a way to make the function query the data based on say the customer name AND the date range without making another "if" statement?
def query_data(c, dateRange=None, customer_name=None, customer_id=None, customer_date=None):
if customer_name is not None:
query_where = 'customer_name=?'
query_args = [customer_name]
query_where = f'{query_where}'
if customer_id is not None:
query_where = 'customer_name=(SELECT customer_name FROM customers WHERE customer_id=?)'
query_args = [customer_id]
query_where = f'{query_where}'
if customer_date is not None:
query_where = 'order_date=?'
query_args = [customer_date]
query_where = f'{query_where}'
if dateRange is not None:
split_date = dateRange.split(",")
query_where = 'order_date BETWEEN DATE(?) AND DATE(?)'
query_args = [split_date[0], split_date[1]]
query_where = f'{query_where}'
query_string = f"SELECT * FROM transactions WHERE {query_where}"
c.execute(query_string, query_args)
return c.fetchall()
Why my check_email error, i dont know how to fix it
def getLoginDetails():
with sqlite3.connect('database.db') as conn:
cur = conn.cursor()
if 'email' not in session:
loggedIn = False
firstName = ''
noOfItems = 0
else:
loggedIn = True
cur.execute("SELECT userId, firstName FROM users WHERE email = '" + session['email'] + "'")
userId, firstName = cur.fetchone()
if 'email' == "admin#shop.com":
check_email = True
else:
check_email = False
cur.execute("SELECT count(productId) FROM kart WHERE userId = " + str(userId))
noOfItems = cur.fetchone()[0]
conn.close()
return (loggedIn, firstName, noOfItems, check_email)
#app.route("/")
def root():
loggedIn, firstName, noOfItems, check_email = getLoginDetails()
with sqlite3.connect('database.db') as conn:
cur = conn.cursor()
cur.execute('SELECT productId, name, price, description, image, stock FROM products')
itemData = cur.fetchall()
cur.execute('SELECT categoryId, name FROM categories')
categoryData = cur.fetchall()
itemData = parse(itemData)
return render_template('home.html', itemData=itemData, loggedIn=loggedIn, firstName=firstName, noOfItems=noOfItems, categoryData=categoryData, check_email=check_email)
This makes no sense to me as I clearly initialize check_email as one of the first lines of my code, and I even labeled it as global just to be safe and make sure it was within the scope of all my methods.
Error: UnboundLocalError: local variable 'check_email' referenced before assignment
You don't assign to check_email if 'email' not in session.
Getting single row and single column below code is executed sucessfully. How to get multiple columns and rows?
views.py
def get_db_data(request):
conn = MySQLdb.connect (host = "localhost", user = "test_user", passwd = "test_pwd", db = "myproject")
cursor = conn.cursor ()
cursor.execute ("SELECT email_address, mobile_number,id, city, state FROM user")
if cursor.rowcount == 0:
html = "<html><body>There is no Faculty member with id %s.</body></html>" % email_address
else:
row = cursor.fetchone()
html = "<html><body>E-Mail address %s.</body></html>" % row[0]
return HttpResponse(html)
Please help me with this.
UPD:
def get_db_data(request):
conn = MySQLdb.connect (host = "localhost", user = "test_user", passwd = "test_pwd", db = "myproject")
cursor = conn.cursor ()
cursor.execute ("SELECT email_address, mobile_number,id, city, state FROM user")
if cursor.rowcount == 0:
html = "<html><body>There is no Faculty member with id %s.</body> <html>" % email_address
else:
html = "<html>"
for x in cursor.fetchone():
html += "<body>E-Mail address %s.</body>" % x
html += "<html>"
return HttpResponse(html)
All columns
cursor.execute("SELECT * FROM user")
All rows:
cursor.fetchall()
for row in cursor.fetchall():
html = ...
and there is one more thing it is not about your problem but you should keep in mind while write if
The values 0, None, False all are false for if statement so it's better to write if not cursor.rowcount instead if cursor.rowcount==0
you can use this.
import MySQLdb
import MySQLdb.cursors
def get_db_data(request):
conn = MySQLdb.connect(host="localhost", user="test_user", passwd="test_pwd", db="myproject", cursorclass=MySQLdb.cursors.DictCursor)
cursor = conn.cursor()
cursor.execute("SELECT email_address, mobile_number,id, city, state FROM user")
if cursor.rowcount == 0:
html = "<html><body>There is no Faculty member with id.</body></html>"
else:
htm = "<html><body>"
for row in cursor.fetchall():
html += "Id - {id}, E-Mail address - {email_address}, Mobile Number - {mobile_number}, City - {city}, State {state}. </br>".format(**row)
html += "</body></html>"
return HttpResponse(html)
I have a database in mysql, and I'm working in a app in QT4, I'm using Mysqldb connector, I'm already successfully connected to the database, but when I'm querying the table t_usuarios I don't know how to eval it. Can you help me? Thanks in advance.
Part of my code:
def chequeouser(self):
passwdcheck = str(txt_password.text())
usuariover = str(txt_usuario.text())
# datosLogin = "SELECT * FROM t_usuarios WHERE id_usuario = 'usuario' AND pasword = 'password'
cursor = dbase.cursor()
cursor.execute("SELECT id_usuario, password FROM t_usuarios WHERE id_usuario = %s AND password = %s", (usuariover, passwdcheck))
checar = cursor.fetchone()
Thanks for the user who answer me ... I do it, but with some modification as follow ..
passwdcheck = str(txt_password.text())
usuariocheck = str(txt_usuario.text())
# datosLogin = "SELECT * FROM t_usuarios WHERE id_usuario = 'usuario' AND pasword = 'password'
cursor = dbase.cursor()
cursor.execute("SELECT id_usuario, password FROM t_usuarios WHERE id_usuario = %s AND password = %s", (usuariocheck, passwdcheck))
row = cursor.fetchone()
if row == None:
print "no data:"+ usuariocheck
return
if row[1] == passwdcheck:
print "user and password combination is correct" +usuariocheck
else :
print "your input is incorrect"
I'm thinking do this in answer but I not sure if this is correct or not.
fetchone() returns a row of data. The first item is row[0], 2nd item is row[1], etc.
Example:
def chequeouser(self):
passwdcheck = str(txt_password.text())
usuariover = str(txt_usuario.text())
# datosLogin = "SELECT * FROM t_usuarios WHERE id_usuario = 'usuario' AND pasword = 'password'
cursor = dbase.cursor()
cursor.execute("SELECT id_usuario, password FROM t_usuarios WHERE id_usuario = %s AND password = %s", (usuariover, passwdcheck))
row = cursor.fetchone()
if not row:
print "no rows!"
return
if passwdcheck == row[1]:
print 'MATCH for user', row[0]
else:
print 'uhoh'