输入文件检索回数据库image_URL记录-PHP中文网问答

我正在尝试编辑智能手机详细信息，并且所有输入字段都有 dataRequired() 验证。但是，图像的输入文件默认为空。当我尝试编辑其他字段（例如品牌）时，还必须输入图像的输入文件才能成功编辑。如何让输入文件在提交表单后自动检索数据库中的image_URL？

image_URL 的输入文件

{% for smartphone in smartphones %}

                
                
            
{% endfor %}

app.py 中的后端

@app.route('/editSmartphone/',methods = ['GET','POST'])
def editSmartphone(id):
    smartphoneID = id
    conn = get_db_connection()
    smartphones = conn.execute('SELECT * FROM Smartphone WHERE id = ?',(smartphoneID,)).fetchall()

    form = editSmartphoneForm(request.form)
    if request.method == 'POST' and form.validate():
        conn.execute('UPDATE Smartphone SET brand = ?,model = ?,processor = ?, ram = ?, colour = ?, battery = ?, lowprice = ?, highprice = ?, screenSize = ?, refreshRate = ?, description = ?, image_URL = ? WHERE id = ?',(form.brand.data, form.model.data, form.processor.data, form.ram.data, form.colour.data, form.battery.data, form.lowprice.data, form.highprice.data, form.screenSize.data, form.refreshRate.data, form.description.data, form.image_URL.data, smartphoneID))
        conn.commit()
        conn.close()
        message = "Smartphone detail has been modified successfully"
        flash(message,'edited')
        return redirect('/manageSmartphone')
    return render_template('editSmartphone.html',smartphones = smartphones, form = form)