如何解决如何使用SQLite / SQLAlchemy创建数据库表?
我正在尝试使用SQLAlchemy / SQLite在现有数据库中创建一个表,我必须在该表中存储用户和密码,但是它返回一个错误,指出pwd列不存在! 我想念什么吗?我搞砸了吗? 我仍然不太了解,我遵循了一些在线教程中的所有步骤,但仍然没有任何反应。 这是我开发的类对象,然后从另一个寄存器形式尝试存储应用程序中的pw,但是此代码中的错误应该在这里:
import os
basedir = os.path.abspath(os.path.dirname(__file__))
# flask imports
from flask import Flask
from flask_sqlalchemy import SQLAlchemy
from flask_bcrypt import Bcrypt
from sqlalchemy import *
# create flask app
app = Flask(__name__)
# set sqllite db connection
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///' + os.path.join(basedir,'data-dev.sqlite')
engine= create_engine(app.config['SQLALCHEMY_DATABASE_URI'])
# bcrypt extension init to app
bcrypt = Bcrypt(app)
# sqlite init to app
db = SQLAlchemy(app)
# define meta data for table
meta=MetaData()
userstable = Table('users',meta,Column('id',Integer,primary_key = True,autoincrement=True),Column('username',String,unique=True),Column('pwd',String))
# create table to sqlite
meta.create_all(engine)
class User(db.Model):
# user columns
id = db.Column(db.Integer(),primary_key=True,autoincrement=True)
username = db.Column(db.String(64),unique=True)
pwd = db.Column(db.String(128))
def __init__(self,username,pwd):
#self.id=id
self.username=username
self.pwd=bcrypt.generate_password_hash(pwd)
# create user object
user = User('anish','23434')
# insert user object to sqlite
db.session.add(user)
# commit transaction
db.session.commit()
这是错误:
sqlalchemy.exc.OperationalError OperationalError:(sqlite3.OperationalError)表用户没有名为pwd的列[SQL:INSERT INTO用户(用户名,pwd)VALUES(?,?)] [参数:('ita_itf','$ 2 b $ 12 $ VmpTsd0o4uTLj0wGypGu7ujhzYHLlV8k9ekaIP1.yh5lUMMgOM4MC')]
解决方法
import os
basedir = os.path.abspath(os.path.dirname(__file__))
# flask imports
from flask import Flask
from flask_sqlalchemy import SQLAlchemy
from flask_bcrypt import Bcrypt
from sqlalchemy import *
# create flask app
app = Flask(__name__)
# set sqllite db connection
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///' + os.path.join(basedir,'data-dev.sqlite')
engine= create_engine(app.config['SQLALCHEMY_DATABASE_URI'])
# bcrypt extension init to app
bcrypt = Bcrypt(app)
# sqlite init to app
db = SQLAlchemy(app)
# define meta data for table
meta=MetaData()
userstable = Table('users',meta,Column('id',Integer,primary_key = True,autoincrement=True),Column('username',String,unique=True),Column('pwd',String))
# create table to sqlite
meta.create_all(engine)
class User(db.Model):
# table name for User model
__tablename__ = "users"
# user columns
id = db.Column(db.Integer(),primary_key=True,autoincrement=True)
username = db.Column(db.String(64),unique=True)
pwd = db.Column(db.String(128))
def __init__(self,username,pwd):
#self.id=id
self.username=username
self.pwd=bcrypt.generate_password_hash(pwd)
# create user object
user = User('anish','23434')
# insert user object to sqlite
db.session.add(user)
# commit transaction
db.session.commit()
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