使用Connector / Python连接MySQL/查询数据

使用Connector / Python连接MySQL

connect()构造函数创建到MySQL服务器的连接并返回一个 MySQLConnection对象
在python中有以下几种方法可以连接到MySQL数据库：

• 1.使用connect（）构造函数

import mysql.connectorcnx = mysql.connector.connect(user='scott', password='password',host='127.0.0.1',database='employees')
cnx.close()

• 使用connection.MySQLConnection（） 类创建连接对象

from mysql.connector import (connection)cnx = connection.MySQLConnection(user='scott', password='password',host='127.0.0.1',database='employees')
cnx.close()

• 在字典中定义连接参数并使用 **运算符

import mysql.connectorconfig = {'user': 'scott','password': 'password','host': '127.0.0.1','database': 'employees','raise_on_warnings': True
}cnx = mysql.connector.connect(**config)cnx.close()

处理链接错误使用try语句并使用error.Error异常捕获所有错误

import mysql.connector
from mysql.connector import errorcodetry:cnx = mysql.connector.connect(user='scott',database='employ')
except mysql.connector.Error as err:if err.errno == errorcode.ER_ACCESS_DENIED_ERROR:print("Something is wrong with your user name or password")elif err.errno == errorcode.ER_BAD_DB_ERROR:print("Database does not exist")else:print(err)
else:cnx.close()

2.使用Connector / Python查询数据

import datetime
import mysql.connectorcnx = mysql.connector.connect(user='scott', database='employees')
cursor = cnx.cursor()query = ("SELECT first_name, last_name, hire_date FROM employees ""WHERE hire_date BETWEEN %s AND %s")hire_start = datetime.date(1999, 1, 1)
hire_end = datetime.date(1999, 12, 31)cursor.execute(query, (hire_start, hire_end))for (first_name, last_name, hire_date) in cursor:print("{}, {} was hired on {:%d %b %Y}".format(last_name, first_name, hire_date))cursor.close()
cnx.close()

参考链接：

https://dev.mysql.com/doc/connector-python/en/connector-python-examples.html