如何通过刷新页面来重启Flask进程 [英] How to restart Flask process by refreshing page

问题描述

我有一个简单的 Flask 应用程序，该应用程序使用一组参数查询数据库，然后绘制结果.效果很好，但是如何在进程仍在运行时重新启动进程(查询数据库，绘制数据)并刷新页面，或者再次单击提交按钮?

I have a simple Flask application that queries a database using a set of parameters and then plots the result. This works fine, but how do I restart process(querying database, plotting data) whenever its still running and I do a refresh of the page or I click the submit button again?

app = Flask(__name__)

@app.route('/', methods=['GET', 'POST'])
def index():
   form = InputForm(request.form)
   if request.method == 'POST' and form.validate():
       data = queryDatabase(form.startdate.data, form.enddate.data)
       result = plotData(data)
   else:
       result = None
   return render_template('view.html', form=form, result=result)

if __name__ == '__main__':
    app.run(host='0.0.0.0', port=5000, debug=True)

view.html

view.html

<form method=post action="">
<table>
  {% for field in form %}
    <tr>
    <td>{{ field.label }}</td>
        <td>{{ field }}</td>

    </tr>
  {% endfor %}
</table>
<p><input type=submit value=Submit></form></p>

<p>
{% if result != None %}
<img src="{{ result }}" width="500">
{% endif %}
</p>

推荐答案

您应该使用队列，例如别人提到的Celery + Redis或Celery + RabbitMq.您可以在此处举例: http://eon01.com/blog/celery-worker-rabbitmq-broker-by-step-by-troduction/

You should use queues For example Celery + Redis or Celery + RabbitMq as mentioned by others. You can examples here: http://eon01.com/blog/celery-worker-rabbitmq-broker-step-by-step-introduction/

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