这是Mysql数据库连接

from flask import Flask, render_template, request
from flask_mysqldb import MySQL

app = Flask(__name__)


app.config['MYSQL_HOST'] = 'localhost'
app.config['MYSQL_USER'] = 'root'
app.config['MYSQL_PASSWORD'] = 'root'
app.config['MYSQL_DB'] = 'MyDB'

mysql = MySQL(app)


@app.route('/', methods=['GET', 'POST']) 
def index():
    if request.method == "POST":
        details = request.form
        cur = mysql.connection.cursor()
        cur.execute ("_Your query_")
        mysql.connection.commit()
        cur.close()
        return 'success'
    return render_template('index.html')


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

首先安装驱动程序

pip install MySQL-python   

然后一个基本代码是这样的:

#!/usr/bin/python
import MySQLdb

try:
    db = MySQLdb.connect(host="localhost",      # db server, can be a remote one 
                     db="mydb"                  # database
                     user="mydb",               # username
                     passwd="mydb123",          # password for this username
                     )        

    # Create a Cursor object
    cur = db.cursor()

    # Create a query string. It can contain variables
    query_string = "SELECT * FROM MY_TABLE"

    # Execute the query
    cur.execute(query_string)

    # Get all the rows present the database
    for each_row in cur.fetchall():
        print each_row

    # Close the connection
    db.close()
except Exception, e:
    print 'Error ', e 

这里有一种方法，使用MySQLdb，它只支持Python 2:

#!/usr/bin/python
import MySQLdb

# Connect
db = MySQLdb.connect(host="localhost",
                     user="appuser",
                     passwd="",
                     db="onco")

cursor = db.cursor()

# Execute SQL select statement
cursor.execute("SELECT * FROM location")

# Commit your changes if writing
# In this case, we are only reading data
# db.commit()

# Get the number of rows in the resultset
numrows = cursor.rowcount

# Get and display one row at a time
for x in range(0, numrows):
    row = cursor.fetchone()
    print row[0], "-->", row[1]

# Close the connection
db.close()

参考这里

只是对上面的回答做了修改。 简单地运行这个命令来安装mysql for python

sudo yum install MySQL-python
sudo apt-get install MySQL-python

记住!区分大小写。

PyMySQL 0.10.1 -发布:2020年9月10日，也支持python3。

python3 -m pip install PyMySQL

简单的代码:

import pymysql

# Connect to the database
conn = pymysql.connect(host='127.0.0.1',user='root',passwd='root',db='fax')

# Create a Cursor object
cur = conn.cursor()

# Execute the query
cur.execute("SELECT * FROM fax.student")

# Read and print records
for row in cur.fetchall():
    print(row)

输出:

(1, 'Petar', 'Petrovic', 1813, 'Njegusi')
(2, 'Donald', 'Tramp', 1946, 'New York')
(3, 'Bill', 'Gates', 1955, 'Seattle')

SqlAlchemy

SQLAlchemy是Python SQL工具包和对象关系映射器 为应用程序开发人员提供了SQL的全部功能和灵活性。 SQLAlchemy提供了一个完整的著名企业级套件 持久性模式，为高效和高性能而设计 数据库访问，改编成简单的python域语言。

安装

pip install sqlalchemy

原始查询

from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker, scoped_session

engine = create_engine("mysql://<user_name>:<password>@<host_name>/<db_name>")
session_obj = sessionmaker(bind=engine)
session = scoped_session(session_obj)

# insert into database
session.execute("insert into person values(2, 'random_name')")
session.flush()
session.commit()

蠕虫方式

from sqlalchemy import Column, Integer, String
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker, scoped_session

Base = declarative_base()
engine = create_engine("mysql://<user_name>:<password>@<host_name>/<db_name>")
session_obj = sessionmaker(bind=engine)
session = scoped_session(session_obj)

# Bind the engine to the metadata of the Base class so that the
# declaratives can be accessed through a DBSession instance
Base.metadata.bind = engine

class Person(Base):
    __tablename__ = 'person'
    # Here we define columns for the table person
    # Notice that each column is also a normal Python instance attribute.
    id = Column(Integer, primary_key=True)
    name = Column(String(250), nullable=False)

# insert into database
person_obj = Person(id=12, name="name")
session.add(person_obj)
session.flush()
session.commit()