def find_by_id(self, id):
"""Suchen eines Studenten nach der übergebenen ID.
:param id Primärschlüsselattribut eines Studenten aus der Datenbank
:return Student-Objekt, welche mit der ID übereinstimmt,
None wenn kein Eintrag gefunden wurde
"""
result = None
cursor = self._connection.cursor()
command = "SELECT id, name, email, google_user_id, mat_nr, kuerzel FROM studenten WHERE id='{}'".format(
id)
cursor.execute(command)
tuples = cursor.fetchall()
try:
(id, name, email, google_user_id, mat_nr, kuerzel) = tuples[0]
student = Student()
student.set_id(id)
student.set_name(name)
student.set_email(email)
student.set_google_user_id(google_user_id)
student.set_mat_nr(mat_nr)
student.set_kuerzel(kuerzel)
result = student
except IndexError:
"""Der IndexError wird oben beim Zugriff auf tuples[0] auftreten, wenn der vorherige SELECT-Aufruf
keine Tupel liefert, sondern tuples = cursor.fetchall() eine leere Sequenz zurück gibt."""
result = None
self._connection.commit()
cursor.close()
return result
def find_by_mail(self, email):
result = None
cursor = self._cnx.cursor()
command = "SELECT * FROM student WHERE email LIKE '%{}%'".format(email)
cursor.execute(command)
tuples = cursor.fetchall()
try:
(id, creation_time, name, matriculation_nr, course_abbr, email,
google_user_id) = tuples[0]
student = Student()
student.set_id(id)
student.set_creation_time(creation_time)
student.set_name(name)
student.set_matriculation_nr(matriculation_nr)
student.set_course_abbr(course_abbr)
student.set_email(email)
student.set_google_user_id(google_user_id)
result = student
except IndexError:
result = None
self._cnx.commit()
cursor.close()
return result
def find_all(self):
"""Auslesen aller Studenten aus der Datenbank
:return Alle Studenten-Objekte im System
"""
result = []
cursor = self._connection.cursor()
cursor.execute("SELECT * from studenten")
tuples = cursor.fetchall()
for (id, name, email, google_user_id, rolle, mat_nr,
kuerzel) in tuples:
student = Student()
student.set_id(id)
student.set_name(name)
student.set_email(email)
student.set_google_user_id(google_user_id)
student.set_rolle(rolle)
student.set_mat_nr(mat_nr)
student.set_kuerzel(kuerzel)
result.append(student)
self._connection.commit()
cursor.close()
return result