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使用Connector / Python连接MySQL/查询数据

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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()

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