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flask读取数据库(mysql)并展示表格（讲解获取表头的方法）【附上flask好看点的helloworld】

2018-12-11 15:28 537 查看
版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/a19990412/article/details/84955802

简述

为了网页的好看，最好还是用bootstrap

文章目录

好看点的helloworld

anyway,先看初始版本的 helloworld

  • /template/index.html
  • 来自于bootstrap官网
<!doctype html>
<html lang="en">
<head>
<!-- Required meta tags -->
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">

<!-- Bootstrap CSS -->
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css" integrity="sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO" crossorigin="anonymous">

<title>Hello, world!</title>
</head>
<body>
<h1>Hello, world!</h1>

<!-- Optional JavaScript -->
<!-- jQuery first, then Popper.js, then Bootstrap JS -->
<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js" integrity="sha384-ZMP7rVo3mIykV+2+9J3UJ46jBk0WLaUAdn689aCwoqbBJiSnjAK/l8WvCWPIPm49" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/js/bootstrap.min.js" integrity="sha384-ChfqqxuZUCnJSK3+MXmPNIyE6ZbWh2IMqE241rYiqJxyMiZ6OW/JmZQ5stwEULTy" crossorigin="anonymous"></script>
</body>
</html>
  • ./app.py
from flask import Flask, render_template

app = Flask(__name__)

@app.route('/')
def hello_world():
return render_template('index.html')

if __name__ == '__main__':
app.run()

链接数据库

这里我推荐使用pymysql
因为这个在不同平台上都可以使用，而且安装也没什么坑。

pip install pymysql
  • 链接的示范 conn是一个连接器
  • host是url
  • user是用户
  • password是密码
  • db是数据库（也就是show databases;可以看到的）
  • charset主要是为了设置为可以看中文
import pymysql

conn = pymysql.connect(
host='127.0.0.1',
user='root',
password='1234',
db='library_management_system',
charset='utf8'
)

结合在html上和flask上

html代码修改

  • /templates/index.html
<!doctype html>
<html lang="en">
<head>
<!-- Required meta tags -->
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">

<!-- Bootstrap CSS -->
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css"
integrity="sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO" crossorigin="anonymous">

<title>Hello, world!</title>
</head>
<body>
<div class="row">
<div class="col-md-6 col-sm-12 col-xs-12">
<div class="panel panel-default">
<div class="panel-heading">
<h3>Students</h3>
</div>
<div class="panel-body">
<div class="table-responsive">
<table class="table table-striped table-bordered table-hover">
<thead>
<tr>
{% for i in labels %}
<td>{{ i }}</td>
{% endfor %}
</tr>
</thead>
<tbody>
{% for i in content %}
<tr>
{% for j in i %}
<td>{{ j }}</td>
{% endfor %}
</tr>
{% endfor %}
</tbody>
</table>
</div>
</div>
</div>

</div>

</div>
<!-- Optional JavaScript -->
<!-- jQuery first, then Popper.js, then Bootstrap JS -->
<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js"
integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo"
crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js"
integrity="sha384-ZMP7rVo3mIykV+2+9J3UJ46jBk0WLaUAdn689aCwoqbBJiSnjAK/l8WvCWPIPm49"
crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/js/bootstrap.min.js"
integrity="sha384-ChfqqxuZUCnJSK3+MXmPNIyE6ZbWh2IMqE241rYiqJxyMiZ6OW/JmZQ5stwEULTy"
crossorigin="anonymous"></script>
</body>
</html>
from flask import Flask, render_template
import pymysql

app = Flask(__name__)

conn = pymysql.connect(
host='127.0.0.1',
user='root',
password='1234',
db='jxgl',
charset='utf8'
)

@app.route('/')
def hello_world():
cur = conn.cursor()

# get annual sales rank
sql = "select * from student"
cur.execute(sql)
content = cur.fetchall()

# 获取表头
sql = "SHOW FIELDS FROM student"
cur.execute(sql)
labels = cur.fetchall()
labels = [l[0] for l in labels]

return render_template('index.html', labels=labels, content=content)

if __name__ == '__main__':
app.run()
  • 效果:

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