我目前正在使用mysqlalchemy，kivy，安装程序和main来从GUI获取用户输入并将其存储在sql数据库中。尝试从我的“ adding_data_for人”添加数据时。发生此错误。我知道错误不是在奇异之处，但我敢打赌它与安装程序有关。我也只想存储数据，别无其他。抱歉，代码太长且凌乱。
Traceback (most recent call last):
File "/usr/lib64/python3.6/site-packages/sqlalchemy/engine/base.py", line 1246, in _execute_context
cursor, statement, parameters, context
File "/usr/lib64/python3.6/site-packages/sqlalchemy/engine/default.py", line 588, in do_execute
cursor.execute(statement, parameters)
File "/usr/lib/python3.6/site-packages/mysql/connector/cursor.py", line 515, in execute
self._handle_result(self._connection.cmd_query(stmt))
File "/usr/lib/python3.6/site-packages/mysql/connector/connection.py", line 488, in cmd_query
result = self._handle_result(self._send_cmd(ServerCmd.QUERY, query))
File "/usr/lib/python3.6/site-packages/mysql/connector/connection.py", line 395, in _handle_result
raise errors.get_exception(packet)
mysql.connector.errors.DatabaseError: 1364 (HY000): Field 'school_id' doesn't have a default value
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "/home/cse/git/soft_161_homework/milestone_1/main.py", line 215, in <module>
app.run()
File "/usr/lib64/python3.6/site-packages/kivy/app.py", line 855, in run
runTouchApp()
File "/usr/lib64/python3.6/site-packages/kivy/base.py", line 504, in runTouchApp
EventLoop.window.mainloop()
File "/usr/lib64/python3.6/site-packages/kivy/core/window/window_sdl2.py", line 747, in mainloop
self._mainloop()
File "/usr/lib64/python3.6/site-packages/kivy/core/window/window_sdl2.py", line 479, in _mainloop
EventLoop.idle()
File "/usr/lib64/python3.6/site-packages/kivy/base.py", line 342, in idle
self.dispatch_input()
File "/usr/lib64/python3.6/site-packages/kivy/base.py", line 327, in dispatch_input
post_dispatch_input(*pop(0))
File "/usr/lib64/python3.6/site-packages/kivy/base.py", line 233, in post_dispatch_input
listener.dispatch('on_motion', etype, me)
File "kivy/_event.pyx", line 707, in kivy._event.EventDispatcher.dispatch
File "/usr/lib64/python3.6/site-packages/kivy/core/window/__init__.py", line 1402, in on_motion
self.dispatch('on_touch_down', me)
File "kivy/_event.pyx", line 707, in kivy._event.EventDispatcher.dispatch
File "/usr/lib64/python3.6/site-packages/kivy/core/window/__init__.py", line 1418, in on_touch_down
if w.dispatch('on_touch_down', touch):
File "kivy/_event.pyx", line 707, in kivy._event.EventDispatcher.dispatch
File "/usr/lib64/python3.6/site-packages/kivy/uix/screenmanager.py", line 1191, in on_touch_down
return super(ScreenManager, self).on_touch_down(touch)
File "/usr/lib64/python3.6/site-packages/kivy/uix/widget.py", line 549, in on_touch_down
if child.dispatch('on_touch_down', touch):
File "kivy/_event.pyx", line 707, in kivy._event.EventDispatcher.dispatch
File "/usr/lib64/python3.6/site-packages/kivy/uix/relativelayout.py", line 288, in on_touch_down
ret = super(RelativeLayout, self).on_touch_down(touch)
File "/usr/lib64/python3.6/site-packages/kivy/uix/widget.py", line 549, in on_touch_down
if child.dispatch('on_touch_down', touch):
File "kivy/_event.pyx", line 707, in kivy._event.EventDispatcher.dispatch
File "/usr/lib64/python3.6/site-packages/kivy/uix/behaviors/button.py", line 151, in on_touch_down
self.dispatch('on_press')
File "kivy/_event.pyx", line 703, in kivy._event.EventDispatcher.dispatch
File "kivy/_event.pyx", line 1214, in kivy._event.EventObservers.dispatch
File "kivy/_event.pyx", line 1098, in kivy._event.EventObservers._dispatch
File "/usr/lib64/python3.6/site-packages/kivy/lang/builder.py", line 64, in custom_callback
exec(__kvlang__.co_value, idmap)
File "/home/cse/git/soft_161_homework/milestone_1/schooltracking.kv", line 525, in <module>
app.adding_data_for_people()
File "/home/cse/git/soft_161_homework/milestone_1/main.py", line 184, in adding_data_for_people
session.commit()
File "/usr/lib64/python3.6/site-packages/sqlalchemy/orm/session.py", line 1036, in commit
self.transaction.commit()
File "/usr/lib64/python3.6/site-packages/sqlalchemy/orm/session.py", line 503, in commit
self._prepare_impl()
File "/usr/lib64/python3.6/site-packages/sqlalchemy/orm/session.py", line 482, in _prepare_impl
self.session.flush()
File "/usr/lib64/python3.6/site-packages/sqlalchemy/orm/session.py", line 2479, in flush
self._flush(objects)
File "/usr/lib64/python3.6/site-packages/sqlalchemy/orm/session.py", line 2617, in _flush
transaction.rollback(_capture_exception=True)
File "/usr/lib64/python3.6/site-packages/sqlalchemy/util/langhelpers.py", line 68, in __exit__
compat.reraise(exc_type, exc_value, exc_tb)
File "/usr/lib64/python3.6/site-packages/sqlalchemy/util/compat.py", line 153, in reraise
raise value
File "/usr/lib64/python3.6/site-packages/sqlalchemy/orm/session.py", line 2577, in _flush
flush_context.execute()
File "/usr/lib64/python3.6/site-packages/sqlalchemy/orm/unitofwork.py", line 422, in execute
rec.execute(self)
File "/usr/lib64/python3.6/site-packages/sqlalchemy/orm/unitofwork.py", line 589, in execute
uow,
File "/usr/lib64/python3.6/site-packages/sqlalchemy/orm/persistence.py", line 245, in save_obj
insert,
File "/usr/lib64/python3.6/site-packages/sqlalchemy/orm/persistence.py", line 1137, in _emit_insert_statements
statement, params
File "/usr/lib64/python3.6/site-packages/sqlalchemy/engine/base.py", line 982, in execute
return meth(self, multiparams, params)
File "/usr/lib64/python3.6/site-packages/sqlalchemy/sql/elements.py", line 293, in _execute_on_connection
return connection._execute_clauseelement(self, multiparams, params)
File "/usr/lib64/python3.6/site-packages/sqlalchemy/engine/base.py", line 1101, in _execute_clauseelement
distilled_params,
File "/usr/lib64/python3.6/site-packages/sqlalchemy/engine/base.py", line 1250, in _execute_context
e, statement, parameters, cursor, context
File "/usr/lib64/python3.6/site-packages/sqlalchemy/engine/base.py", line 1476, in _handle_dbapi_exception
util.raise_from_cause(sqlalchemy_exception, exc_info)
File "/usr/lib64/python3.6/site-packages/sqlalchemy/util/compat.py", line 398, in raise_from_cause
reraise(type(exception), exception, tb=exc_tb, cause=cause)
File "/usr/lib64/python3.6/site-packages/sqlalchemy/util/compat.py", line 152, in reraise
raise value.with_traceback(tb)
File "/usr/lib64/python3.6/site-packages/sqlalchemy/engine/base.py", line 1246, in _execute_context
cursor, statement, parameters, context
File "/usr/lib64/python3.6/site-packages/sqlalchemy/engine/default.py", line 588, in do_execute
cursor.execute(statement, parameters)
File "/usr/lib/python3.6/site-packages/mysql/connector/cursor.py", line 515, in execute
self._handle_result(self._connection.cmd_query(stmt))
File "/usr/lib/python3.6/site-packages/mysql/connector/connection.py", line 488, in cmd_query
result = self._handle_result(self._send_cmd(ServerCmd.QUERY, query))
File "/usr/lib/python3.6/site-packages/mysql/connector/connection.py", line 395, in _handle_result
raise errors.get_exception(packet)
sqlalchemy.exc.DatabaseError: (mysql.connector.errors.DatabaseError) 1364 (HY000): Field 'school_id' doesn't have a default value
[SQL: INSERT INTO person (home_id, name, grade_level) VALUES (%(home_id)s, %(name)s, %(grade_level)s)]
[parameters: {'home_id': 1, 'name': 'qwd', 'grade_level': 8}]
(Background on this error at: http://sqlalche.me/e/4xp6)
main.py
from kivy.app import App
from kivy.uix.label import Label
from kivy.modules import inspector # For inspection
from kivy.core.window import Window # For inspection
from kivy.uix.button import Button
from kivy.uix.screenmanager import ScreenManager, Screen
from sys import stderr
from sqlalchemy.exc import SQLAlchemyError
from sqlalchemy.exc import ProgrammingError
from schooltracking import SchoolTrackingDatabase, School, Home, Person
from kivy.uix.floatlayout import FloatLayout
from kivy.uix.popup import Popup
from kivy.clock import Clock
from kivy.properties import ObjectProperty
from sqlalchemy.orm import sessionmaker
class SchoolTrackingApp(App):
def build(self):
inspector.create_inspector(Window, self)
def __init__(self, **kwargs):
super(SchoolTrackingApp, self).__init__(**kwargs)
url = SchoolTrackingDatabase.construct_mysql_url('localhost', 3306, 'schooltracking', 'root', 'cse')
self.schooltracking = SchoolTrackingDatabase(url)
self.session = self.schooltracking.create_session()
def database_entries(self):
query = self.session.query(School.names).all()
query2 = self.session.query(School.district).all()
text = self.root.ids.input_screen.text
text2 = self.root.ids.input_screen2.text
list_name = []
for i in query:
list_name.append(i[0])
list_district = []
for i in query2:
list_district.append(i[0])
for names in list_name:
if text == names:
for districts in list_district:
if text2 == districts:
popup = Popup(title='School and District already in database',
content=Label(text=' Sorry, but it looks like that name and \ndistrict are already in our datbase. \nPlease create a new one.'),
size_hint=(None, None), size=(400, 400))
popup.open()
break
def blank_entries(self):
text = self.root.ids.input_screen.text
text2 = self.root.ids.input_screen2.text
text3 = self.root.ids.input_screen3.text
text4 = self.root.ids.input_screen4.text
text5 = self.root.ids.input_screen5.text
text6 = self.root.ids.input_screen6.text
text7 = self.root.ids.input_screen7.text
text8 = self.root.ids.input_screen8.text
text9 = self.root.ids.input_screen9.text
text10 = self.root.ids.input_screen10.text
text11 = self.root.ids.input_screen.text
text12 = self.root.ids.input_screen2.text
text13 = self.root.ids.input_screen3.text
text14 = self.root.ids.input_screen4.text
text15 = self.root.ids.input_screen5.text
text16 = self.root.ids.input_screen5.text
text17 = self.root.ids.input_screen6.text
text18 = self.root.ids.input_screen7.text
text19 = self.root.ids.input_screen8.text
text20 = self.root.ids.input_screen8.text
text21 = self.root.ids.input_screen.text
text22 = self.root.ids.input_screen2.text
text23 = self.root.ids.input_screen3.text
text24 = self.root.ids.input_screen4.text
text25 = self.root.ids.input_screen4.text
if text or text2 or text3 or text4 or text5 or text6 or text7 or text8 or text9 or text10 or text11 or text12 or text13 or text14 or text15 or text16 or text17 or text18 or text19 or text20 or text21 or text22 or text23 or text24 or text25== '':
popup = Popup(title='No input given',
content=Label(text=' The text boxes cannot be left blank!'),
size_hint=(None, None), size=(400, 400))
popup.open()
def NA_entry(self):
text9 = self.root.ids.input_screen9.text
if text9 != 'N/A':
popup = Popup(title='Not N/A',
content=Label(text=' The text box has to be N/A!'),
size_hint=(None, None), size=(400, 400))
popup.open()
def check_no_school_represents_child(self):
query3 = self.session.query(Person.grade_level).all()
query4 = self.session.query(Person.name).all()
text10 = self.root.ids.input_screen10.text
list_grade_levels = []
for i in query3:
list_grade_levels.append(i[0])
list_names = []
for i in query4:
list_names.append(i[0])
for names in list_names:
for grade_level in list_grade_levels:
if grade_level == None:
popup = Popup(title='No school representing child',
content=Label(text=' There is no school representing ' + names + ' in this home'),
size_hint=(None, None), size=(400, 400))
popup.open()
break
def adding_data_for_school(self):
url = SchoolTrackingDatabase.construct_mysql_url('localhost', 3306, 'schooltracking', 'root', 'cse')
schooltracking = SchoolTrackingDatabase(url)
schooltracking.ensure_tables_exist()
session = schooltracking.create_session()
add_data(session)
session.commit()
text = self.root.ids.input_screen.text
text2 = self.root.ids.input_screen2.text
text3 = self.root.ids.input_screen3.text
schools = School(names=text, district=text2, education_level=text3)
session.add(schools)
session.commit()
def adding_data_for_home(self):
url = SchoolTrackingDatabase.construct_mysql_url('localhost', 3306, 'schooltracking', 'root', 'cse')
schooltracking = SchoolTrackingDatabase(url)
schooltracking.ensure_tables_exist()
session = schooltracking.create_session()
add_data(session)
session.commit()
text4 = self.root.ids.input_screen4.text
text20 = self.root.ids.input_screen20.text
text21 = self.root.ids.input_screen21.text
text22 = self.root.ids.input_screen22.text
text23 = self.root.ids.input_screen23.text
text24 = self.root.ids.input_screen24.text
address = Home(school_id=1,first_address=text4, second_address=text20, city=text21, state_or_province=text22, postal_code=68118, country=text24)
session.add(address)
session.commit()
def adding_data_for_people(self):
url = SchoolTrackingDatabase.construct_mysql_url('localhost', 3306, 'schooltracking', 'root', 'cse')
schooltracking = SchoolTrackingDatabase(url)
schooltracking.ensure_tables_exist()
session = schooltracking.create_session()
add_data(session)
session.commit()
text5 = self.root.ids.input_screen5.text
text6 = self.root.ids.input_screen6.text
text7 = self.root.ids.input_screen7.text
text8 = self.root.ids.input_screen8.text
text9 = self.root.ids.input_screen9.text
person = Person(home_id=1, name=text5, grade_level=8)
session.add(person)
session.commit()
def add_data(session):
pass (This will add the data to the database do notneed to worry about this)
def main():
try:
url = SchoolTrackingDatabase.construct_mysql_url('localhost', 3306, 'schooltracking', 'root', 'cse')
schooltracking = SchoolTrackingDatabase(url)
schooltracking.ensure_tables_exist()
print('Tables created.')
session = schooltracking.create_session()
add_data(session)
session.commit()
print('Records created.')
print('Your database has been successfully created!')
except (SQLAlchemyError) as exception:
print('Database setup failed', file=stderr)
print(f'Cause: {exception}', file=stderr)
#if ProgrammingError:
#print('Your credentials are incorrect with those matching to the database.' )
exit(1)
if __name__ == '__main__':
main()
app = SchoolTrackingApp()
app.run()
安装程序
from sqlalchemy import create_engine, Column, Integer, String, DateTime, ForeignKfrom
sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker, relationship
Persisted = declarative_base()
class School(Persisted):
__tablename__ = 'schools'
school_id = Column(Integer, primary_key=True)
names = Column(String(256), nullable=False)
district = Column(String(256), nullable=False)
education_level = Column(String(256), nullable=False)
homes = relationship('Home', uselist=True, back_populates='school')
class Home(Persisted):
__tablename__ = 'homes'
home_id = Column(Integer, primary_key=True)
school_id = Column(Integer, ForeignKey('schools.school_id', ondelete='CASCADE'), nullable=False)
first_address = Column(String(256), nullable=False)
second_address = Column(String(256), nullable=True)
city = Column(String(256), nullable=False)
state_or_province = Column(String(256), nullable=False)
postal_code = Column(String(256), nullable=False)
country = Column(String(256), nullable=False)
school = relationship('School', back_populates='homes')
person = relationship('Person', back_populates='homes')
class Person(Persisted):
__tablename__ = 'person'
person_id = Column(Integer, primary_key=True)
home_id = Column(Integer, ForeignKey('homes.home_id', ondelete='CASCADE'), nullable=False)
name = Column(String(256), nullable=False)
grade_level = Column(Integer, nullable=False)
homes = relationship('Home', back_populates='person')
class SchoolTrackingDatabase(object):
@staticmethod
def construct_mysql_url(authority, port, database, username, password):
return f'mysql+mysqlconnector://{username}:{password}@{authority}:{port}/{database}'
@staticmethod
def construct_in_memory_url():
return 'sqlite:///'
def __init__(self, url):
self.engine = create_engine(url) # an engine is like an endpoint, something to connect to
self.Session = sessionmaker() # create a class for connections to that endpoint / pylint:
disable=invalid-name
self.Session.configure(bind=self.engine) # associate the class with the endpoint
def ensure_tables_exist(self):
Persisted.metadata.create_all(self.engine) # create tables for all subclasses of Persisted
def create_session(self):
return self.Session() # create a new session, which is like a connection to the database
如果需要kivy文件，请告诉我：）
sqlalchemy.exc.DatabaseError: (mysql.connector.errors.DatabaseError) 1364 (HY000): Field 'school_id' doesn't have a default value
[SQL: INSERT INTO person (home_id, name, grade_level) VALUES (%(home_id)s, %(name)s, %(grade_level)s)]
[parameters: {'home_id': 1, 'name': 'qwd', 'grade_level': 8}]
正如错误所言，您试图在不指定school_id的情况下将数据插入表中，该表没有默认值。您有两个选择：
school_id。school_id设置默认值。