flask-mysql和sqlalchemy

flask-mysql是一个Flask扩展，它提供了一种使用MySQL数据库的简单方法。它允许您轻松地连接到MySQL数据库并执行查询。以下是使用flask-mysql连接MySQL数据库的步骤：

1.安装flask-mysql扩展

pip install flask-mysql

2.在Flask应用程序中配置MySQL数据库连接

from flask import Flask
from flaskext.mysql import MySQL

app = Flask(__name__)
mysql = MySQL()

# MySQL configurations
app.config['MYSQL_DATABASE_USER'] = 'root'
app.config['MYSQL_DATABASE_PASSWORD'] = 'password'
app.config['MYSQL_DATABASE_DB'] = 'mydb'
app.config['MYSQL_DATABASE_HOST'] = 'localhost'
mysql.init_app(app)

3.在Flask应用程序中执行MySQL查询

from flask import Flask
from flaskext.mysql import MySQL

app = Flask(__name__)
mysql = MySQL()

# MySQL configurations
app.config['MYSQL_DATABASE_USER'] = 'root'
app.config['MYSQL_DATABASE_PASSWORD'] = 'password'
app.config['MYSQL_DATABASE_DB'] = 'mydb'
app.config['MYSQL_DATABASE_HOST'] = 'localhost'
mysql.init_app(app)

@app.route('/')
def index():
    cursor = mysql.get_db().cursor()
    cursor.execute('SELECT * FROM mytable')
    data = cursor.fetchall()
    return str(data)

SQLAlchemy是一个Python SQL工具包和ORM，它提供了一种使用SQL数据库的简单方法。它允许您轻松地连接到SQL数据库并执行查询。以下是使用SQLAlchemy连接MySQL数据库的步骤：

1.安装SQLAlchemy

pip install sqlalchemy

2.在Python应用程序中配置MySQL数据库连接

from sqlalchemy import create_engine

# MySQL configurations
user = 'root'
password = 'password'
host = 'localhost'
database = 'mydb'

engine = create_engine(f'mysql://{user}:{password}@{host}/{database}')

3.在Python应用程序中执行MySQL查询

from sqlalchemy import create_engine, Table, Column, Integer, String, MetaData

# MySQL configurations
user = 'root'
password = 'password'
host = 'localhost'
database = 'mydb'

engine = create_engine(f'mysql://{user}:{password}@{host}/{database}')

metadata = MetaData()

mytable = Table('mytable', metadata,
    Column('id', Integer, primary_key=True),
    Column('name', String),
    Column('age', Integer),
)

with engine.connect() as conn:
    result = conn.execute(mytable.select())
    for row in result:
        print(row)