Flask / SQLAlchemy插入数据库

时间:2014-02-24 05:55:22

标签: python ajax json sqlalchemy flask

在我的localhost上使用Flask和SQLAlchemy,我希望能够提交一个简单的联系表单,并使用AJAX将提交的数据传递给我的Flask API,然后将其插入我的本地数据库,名为{{1 }}

为了设置我的数据库,我整理了一个名为contact.db的脚本,该脚本在我的工作目录中成功创建了一个数据库。其内容如下:

setup.py

我的简单联系页面收集数据并使用AJAX将其提交到我的烧瓶路线from sqlalchemy import create_engine, ForeignKey from sqlalchemy import Column, Date, Integer, String from sqlalchemy.ext.declarative import declarative_base from sqlalchemy.orm import relationship, backref engine = create_engine('sqlite:///contact.db', echo=True) Base = declarative_base() ######################################################################## class Contact(Base): """""" __tablename__ = "contact" id = Column(Integer, primary_key=True) f_name = Column(String) l_name = Column(String) email = Column(String) message = Column(String) #---------------------------------------------------------------------- def __init__(self, f_name, l_name, email, message): """""" self.f_name = f_name self.l_name = l_name self.email = email self.message = message # create tables Base.metadata.create_all(engine) (我已经通过控制台确认了这一点)。但是,作为参考,这里是我在/contact/request中使用的代码:

contact.html

最后,我运行了我运行的实际Flask API脚本,以便在localhost上启动我的服务。 <!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1"> <title>Contact</title> <!-- Bootstrap --> <link href="{{ url_for('static', filename='css/bootstrap.min.css') }}" rel="stylesheet"> <!-- HTML5 Shim and Respond.js IE8 support of HTML5 elements and media queries --> <!-- WARNING: Respond.js doesn't work if you view the page via file:// --> <!--[if lt IE 9]> <script src="https://oss.maxcdn.com/libs/html5shiv/3.7.0/html5shiv.js"></script> <script src="https://oss.maxcdn.com/libs/respond.js/1.4.2/respond.min.js"></script> <![endif]--> <!-- jQuery (necessary for Bootstrap's JavaScript plugins) --> <script src="https://code.jquery.com/jquery.js"></script> <!-- Include all compiled plugins (below), or include individual files as needed --> <script src="{{ url_for('static', filename='js/bootstrap.min.js') }}"></script> <script> $(document).ready(function(){ $("#submitForm").click(function() { var firstName = $("#f_name").val(); var lastName = $("#l_name").val(); var email = $("#email").val(); var mess = $("#mess").val(); var nud = { "f_name" : firstName, "l_name" : lastName, "email" : email, "message" : mess } $.ajax({ type: "POST", url: "/contact/request", data: JSON.stringify(nud, null, '\t'), contentType: 'application/json;charset=UTF-8', success: function(result) { console.log(result); } }) }); }) </script> </head> <body> <div class="row"> <div class="col-md-3"></div> <div class="col-md-6"> <div class="panel panel-default"> <div class="panel-heading"> <h1 style="text-align: center">Contact Me</h1> </div> <div class="panel-body"> <form role="form"> <div class="form-horizontal" class="form-group" style="width:50%"> <label for="name has-success">First Name</label> <input class="form-control input-md" type="text" class="form-control" id="f_name" placeholder="Matthew"> </div><br /> <div class="form-horizontal" class="form-group" style="width:50%"> <label for="email">Last Name</label> <input class="form-control input-md" type="text" class="form-control" id="l_name" placeholder="Gross"> </div><br /> <div class="form-horizontal" class="form-group" style="width:50%"> <label for="email">Email</label> <input class="form-control input-md" type="email" class="form-control" id="email" placeholder="mattkgross@gmail.com"> </div><br /> <div class="form-group"> <label for="aboutMe">Message</label> <textarea class="form-control" id="mess" placeholder="What's up?" rows="3" ></textarea> </div> <div> <button type="button" input type "submit" class="btn btn-success" id="submitForm">Submit</button> </div> </form> </div> </div> </div> <div class="col-md-3"></div> </div> </body> </html> 路由正常。但是,当我通过表单提交发送数据时,我收到内部服务器错误。毫无疑问,这是由于我将解析后的JSON插入我的联系人数据库的错误尝试造成的。以下是我/contact中使用的代码:

api.py

如果我注释掉这两行:

from flask import Flask
from flask import request
from flask import render_template

import datetime
from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker
from setup import Contact

app = Flask(__name__)

@app.route('/contact')
def contact():
    return render_template('contact.html')

@app.route('/contact/request', methods=["POST"])
def contact_request():
    if request.method == "POST":
        engine = create_engine('sqlite:///contact.db', echo=True)

        # Create a Session
        Session = sessionmaker(bind=engine)
        session = Session()

        new_contact = Contact(request.json['f_name'],
                              request.json['l_name'],
                              request.json['email'],
                              request.json['message'])

        # Add the record to the session object
        session.add(new_contact)
        # commit the record the database
        session.commit()

        #return str(request.json)

app.debug = True
app.run()

并用session.add(new_contact) session.commit() 替换它们,我的控制台成功返回我发送的JSON。我完全迷失了在将数据插入数据库时​​出错的原因以及为什么我的尝试向我抛出错误。

您可以给予我任何帮助,我将非常感激 - 希望这是一件简单的事情,我在对这件事情不熟悉时会被忽视。谢谢!

1 个答案:

答案 0 :(得分:2)

在烧瓶中,你必须为你的路线返回一些东西,否则会导致奇怪的行为。在您的情况下,您可以返回一些简单的“OK”,让您的AJAX知道函数已成功完成。