Jed*_*art 3 python sqlite sqlalchemy flask-sqlalchemy
我正在通过以下教程构建基本的Flask应用程序来学习数据库:https://www.tutorialspoint.com/flask/flask_sqlalchemy.htm我目前正处于需要连接到SQLITE3数据库的位置通过SQLAlchemy.说实话,它并不顺利.我收到此错误:NameError:未定义全局名称'flash'
这是我的app.py.
#!/usr/bin/python
from flask import Flask, render_template, json, request
from flask_sqlalchemy import SQLAlchemy
import sqlite3
conn = sqlite3.connect('test.db')
app = Flask(__name__)
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///students.sqlite3'
db = SQLAlchemy(app)
class Students(db.Model):
id = db.Column('student_id',db.Integer, primary_key=True)
name = db.Column(db.String(80), unique=True)
def __init__(self, name, id):
self.name = name
self.id = id
def __repr__(self):
return '<Students %r>' % self.name
db.create_all()
@app.route("/")
def main():
return render_template('index.html')
@app.route('/new', methods = ['GET', 'POST'])
def new():
if request.method == 'POST':
if not request.form['name'] or not request.form['id']:
flash('Please enter all the fields', 'error')
else:
student = Students(request.form['name'], request.form['id'])
db.session.add(student)
db.session.commit()
flash('Record was successfully added')
return redirect(url_for('show_all'))
return render_template('new.html')
@app.route("/admin")
def show_all():
return render_template('show_all.html', students = students.query.all() )
# create user code will be here !!
if __name__ == "__main__":
app.run(debug=True)
的index.html
<!DOCTYPE html>
<html lang="en">
<head>
<title>Attendance System</title>
<link href="http://getbootstrap.com/dist/css/bootstrap.min.css" rel="stylesheet">
<link href="http://getbootstrap.com/examples/jumbotron-narrow/jumbotron-narrow.css" rel="stylesheet">
</head>
<body>
<div class="container">
<div class="header">
<nav>
<ul class="nav nav-pills pull-right">
<li role="presentation" class="active"><a href="#">Home</a>
</li>
<li role="presentation"><a href="#">Sign In</a>
</li>
<li role="presentation"><a href="new">Sign Up</a>
</li>
</ul>
</nav>
<h3 class="text-muted">Python Flask App</h3>
</div>
<div class="jumbotron">
<h1>Attendance App</h1>
<p class="lead"></p>
<p><a class="btn btn-lg btn-success" href="new" role="button">Sign up today</a>
<a class="btn btn-lg btn-success" href="show_all" role="button">Administrate</a>
</p>
</div>
<footer class="footer">
<p>© Company 2015</p>
</footer>
</div>
</body>
</html>
show_all.html
<!DOCTYPE html>
<html lang = "en">
<head></head>
<body>
<h3>
<a href = "{{ url_for('show_all') }}">Comments - Flask
SQLAlchemy example</a>
</h3>
<hr/>
{%- for message in get_flashed_messages() %}
{{ message }}
{%- endfor %}
<h3>Students (<a href = "{{ url_for('new') }}">Add Student
</a>)</h3>
<table>
<thead>
<tr>
<th>Name</th>
<th>Id</th>
</tr>
</thead>
<tbody>
{% for student in students %}
<tr>
<td>{{ student.name }}</td>
<td>{{ student.id }}</td>
{% endfor %}
</tbody>
</table>
</body>
</html>
**new.html**
<!DOCTYPE html>
<html>
<body>
<h3>Attendance</h3>
<hr/>
{%- for category, message in get_flashed_messages(with_categories = true) %}
<div class = "alert alert-danger">
{{ message }}
</div>
{%- endfor %}
<form action = "{{ request.path }}" method = "post">
<label for = "name">Name</label><br>
<input type = "text" name = "name" placeholder = "Name" /><br>
<label for = "id">Id Number</label><br>
<input type = "text" name = "id" placeholder = "Student Id" /><br>
<input type = "submit" value = "Sign-in!" />
</form>
</body>
</html>
问题:
我不知道连接是否有效,即使错误得到修复,NameError因为它是我的第一个,起初我尝试使用MySQL但不推荐使用flask.ext.mysql,所以我尝试切换到SQLAlchemy和SQLite3 .对于像我这样的新手,我感激不尽.谢谢!
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