sqlite数据库中的烧瓶Sqlalchemy数据未显示
[英]Flask Sqlalchemy data from sqlite database not shown
问题描述
I'm learning to use a database in flask at https://www.tutorialspoint.com/flask/flask_sqlalchemy.htm and my problem is that data doesn't show up on html! 
我正在https://www.tutorialspoint.com/flask/flask_sqlalchemy.htm学习在烧瓶中使用数据库，而我的问题是数据没有显示在html上！
My code : 我的代码：
from flask import Flask, redirect, url_for, request, render_template, session, escape, flash
from flask_sqlalchemy import SQLAlchemy
app = Flask(__name__)
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///students.sqlite3'
db = SQLAlchemy(app)
class Students(db.Model):
id = db.Column(db.Integer, primary_key=True)
stu_num = db.Column('Student Number', db.Integer)
stu_name = db.Column('Name', db.String(100))
def __init__(self, number, name):
self.num = number
self.name = name
@app.route('/students/')
def show_students():
return render_template('show_students.html', students=Students.query.all())
@app.route('/addstudents/', methods=['POST', 'GET'])
def add_students():
if request.method == 'POST':
if not request.form['stu_num'] or not request.form['stu_name']:
flash('Please fill in all the fields')
else:
student = Students(request.form['stu_num'], request.form['stu_name'])
db.session.add(student)
db.session.commit()
flash('Record added')
return redirect(url_for('show_students'))
return render_template('add_students.html')
if __name__ == '__main__':
db.create_all()
app.run(debug = True)
show_students.html: show_students.html：
<!doctype>
<html>
<body>
{% for message in get_flashed_messages() %}
{{ message }}
{% endfor %}
<h2><a href="{{ url_for('add_students') }}">Add Students</a></h2>
<table>
<tr>
<th>Id</th>
<th>Student Number</th>
<th>Name</th>
</tr>
{% for student in students %}
<tr>
<td>{{ student.id }}</td>
<td>{{ student.num }}</td>
<td>{{ student.name }}</td>
</tr>
{% endfor %}
</table>
</body>
</html>
add_students.html: add_students.html：
<!doctype>
<html>
<body>
{% for message in get_flashed_messages() %}
{{ message }}
{% endfor %}
<form action="http://localhost:5000/addstudents/" method="post">
<p>Student Number: <input type="text" name="stu_num"></p>
<p>Student Name: <input type="text" name="stu_name"></p>
<p><input type="submit" value="Submit"></p>
</form>
</body>
</html>
When I add data to the database, Id, which I set to auto-increment shows up, but the rest of data isn't shown. 当我向数据库中添加数据时，会显示设置为自动增量的ID，但不会显示其余数据。
2 个解决方案
解决方案1
1 2017-04-24 07:35:57
SQLAlchemy provides an __init__ function for you which takes care of creating new objects, initializing fields, database, etc. By writing your own __init__, you are overriding SQLAlchemy's __init__(), and preventing it from doing its thing! SQLAlchemy为您提供了__init__函数，该函数负责创建新对象，初始化字段，数据库等。通过编写自己的__init__，您将覆盖SQLAlchemy的__init __（）并阻止其执行其操作！
So try getting rid of your __init__ function! 因此，请尝试摆脱__init__函数！
(Or if there's stuff you want to do in __init__, then make sure to call super().__init__ before or after doing whatever it is that you want to do.) （或者，如果您想在__init__中进行某些操作，请确保在执行您想做的任何事情之前或之后调用super（）.__ init__。）
(But to start, just try getting rid of it...) （但是首先，请尝试摆脱它...）
解决方案2
1 已采纳 2017-04-24 07:37:41
You are using inconsistent variable names here in init function, use 您在init函数中使用的变量名称不一致，请使用
def __init__(self, number, name):
student.stu_num=number
student.stu_name=name
in show_students.html try using 在show_students.html中尝试使用
<td>{{ student.stu_num }}</td>
<td>{{ student.stu_name }} </td>
声明:本站的技术帖子网页，遵循CC BY-SA 4.0协议，如果您需要转载，请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.