我正在尝试在 Heroku 上使用 Gunicorn 运行 Flask 应用程序。
这是我的<style media="screen">
.box {width: 150px; height: 150px; position: absolute; z-index: 0;}
.box:nth-child(1) {background-color: red; top: 0px; left: 0px;}
.box:nth-child(2) {background-color: green; top: 20px; left: 50px;}
.box:nth-child(3) {background-color: yellow; top: 50px; left: 100px;}
.box:nth-child(4) {background-color: blue; top: 80px; left: 150px;}
</style>
<script type="text/javascript">
$(document).ready(function() {
$('.box').draggable({stack: "div"});
});
</script>
<div id="dragZone">
<div class="box" id="box1"></div>
<div class="box" id="box2"></div>
<div class="box" id="box3"></div>
<div class="box" id="box4"></div>
</div>
：
Procfile我有一个名为 web: gunicorn main: app
的文件。这是顶部的一些代码：
main.py我的from flask import Flask, redirect, url_for, render_template, request, session, flash
from datetime import timedelta, datetime
from flask_sqlalchemy import SQLAlchemy
app = Flask(__name__)
app.secret_key = "{Secret Key}"
app.permanent_session_lifetime = timedelta(minutes=10)
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///users.sqlite3'
app.config["SQLALCHEMY_TRACK_MODIFICATIONS"] = False
db = SQLAlchemy(app)
....
if __name__ == "__main__":
db.create_all()
app.run(debug=True)
：
requirements.txt我在我的日志中得到了这个：
click==7.1.2
Flask==1.1.2
Flask-SQLAlchemy==2.4.4
gunicorn==20.0.4
itsdangerous==1.1.0
Jinja2==2.11.2
MarkupSafe==1.1.1
SQLAlchemy==1.3.22
Werkzeug==1.0.1
2020-12-31T00:00:05.879585+00:00 app[web.1]: Failed to parse '' as an attribute name or function call.
2020-12-31T00:00:05.880396+00:00 app[web.1]: [2020-12-31 00:00:05 +0000] [11] [INFO] Worker exiting (pid: 11)
2020-12-31T00:00:05.887417+00:00 app[web.1]: Failed to parse '' as an attribute name or function call.
2020-12-31T00:00:05.888296+00:00 app[web.1]: [2020-12-31 00:00:05 +0000] [10] [INFO] Worker exiting (pid: 10)
2020-12-31T00:00:06.139402+00:00 app[web.1]: [2020-12-31 00:00:06 +0000] [4] [INFO] Shutting down: Master
2020-12-31T00:00:06.139670+00:00 app[web.1]: [2020-12-31 00:00:06 +0000] [4] [INFO] Reason: App failed to load.
2020-12-31T00:00:06.291109+00:00 heroku[web.1]: Process exited with status 4
2020-12-31T00:00:06.360098+00:00 heroku[web.1]: State changed from up to crashed
2020-12-31T00:00:12.000891+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/" [some extra stuff]
2020-12-31T00:00:12.118356+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/favicon.ico" [some extra stuff]
从我在线阅读的内容来看似乎是正确的，但除此之外我没有发现任何问题。有人知道这是怎么回事吗？
答案 0 :(得分：2)
去掉$user_id = 32;
$stmt = $con->prepare("SELECT * FROM users where user_id = ?");
$stmt->bind_param('s', $value);
$stmt->execute();
$result = $stmt->get_result();
foreach($result as $row) {
printf ("%s \n", $row['username']);
}
和main之间的空格：
app其中 web: gunicorn main:app
是模式 WSGI_APP。模块名称可以是完整的虚线路径。变量名指的是应该在指定模块中找到的 WSGI 可调用对象。
有了空格，$(MODULE_NAME):$(VARIABLE_NAME) 和 main: 被读取为单独的参数，Gunicorn 接收一个空字符串作为它的 app。