如何将结果从 SQLite db 显示到 html？

Question

I am currently learning to build a small web-app. I want to show the list of employees in the web page, and later the ability to add a new employee data to the database. I am using SQlite db and Python Flask. But I am stuck at this error message: UnboundLocalError: local variable 'rows' referenced before assignment . So my question is, how do I fetch the content of my SQlite db and show them on my webpage? I'd like to show it as a table as well.

Here's my HTML code:

{% extends "layout.html" %}


{% block body %}
    <h1> Employees </h1>
    <ul>
        {% for employee in employees %}
        <li> {{ employee }}</li>
        {% endfor %}
    </ul>

    <a href = "/add">Add a new employee</a>
{% endblock %}

And my python code:

@app.route("/")
def tasks():
    rows = db.execute("SELECT * FROM employees")
    return render_template("employee_list.html", rows= rows) 

Anybody can help me? Thank you.

Answer 1

use macro

{% macro render_comment(emp) %}
   <li>{{ emp }}</li>
{% endmacro %}
<ul>
     {% for emp in employees %}
          {{ render_comment(emp) }}
    {% endfor %}
</ul>

and change

return render_template("employee_list.html", rows= rows)

to

return render_template("employee_list.html", employees= rows)