在本地主机上使用Flask和SQLAlchemy,我希望能够提交一个简单的联系人表单,并使用AJAX将提交的数据传递给Flask API,然后将其插入本地数据库,名为contact.db
。
为了建立我的数据库,我将一个名为setup.py
的脚本放在一起,它成功地在我的工作目录中创建了一个数据库。其内容如下:
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)
我的简单联系人页面收集数据并使用AJAX将其提交到我的flask路由/contact/request
(我已经通过控制台确认了这一点)。不过,作为参考,这里是我在contact.html
中使用的代码:
<!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>
最后,我有了实际运行的Flask API脚本,以便在本地主机上启动服务。/contact
路由工作正常。但是,当我通过表单提交发送数据时,会收到一个内部服务器错误。这无疑是由于我不正确地尝试将解析后的JSON插入到联系人数据库中造成的。下面是我的api.py
中使用的代码:
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()
如果我把这两行注释掉:
session.add(new_contact)
session.commit()
并用return str(request.json)
替换它们,我的控制台成功地返回我发送的JSON。我完全搞不清楚在数据库中插入数据时出错的地方,以及为什么它会因为我的尝试而向我抛出错误。
你能给我的任何帮助我都会非常感激-希望这是一个简单的事情,我忽略了作为一个新的整个事情。谢谢!
在烧瓶里,你必须为你的路线返回一些东西,否则会导致奇怪的行为。在您的例子中,您可以返回一个简单的“OK”,让AJAX知道函数已成功完成。
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