简介:PyMySQL 是在 Python3.x 版本中用于连接 MySQL 服务器的一个库,Python2中则使用mysqldb。PyMySQL 遵循 Python 数据库 API v2.0 规范,并包含了 pure-Python MySQL 客户端库。
安装:
pip install pymysql
检查安装结果:
pip show pymysql
图片
案例前提1:本地或者服务器创建MySQL
MySQL安装和使用:centos7.6:安装docker下mysql并外网远程连接
案例前提2:新增DB - testerDB ;表userinfo。新增了3条数据
图片封装pymysql操作:
import pymysql
class MysqlHelper(object):
conn = None
def __init__(self, host, username, password, db, charset='utf8', port=3306):
self.host = host
self.username = username
self.password = password
self.db = db
self.charset = charset
self.port = port
def connect(self):
self.conn = pymysql.connect(host=self.host,
port=self.port,
user=self.username,
password=self.password,
db=self.db,
charset=self.charset)
self.cursor = self.conn.cursor()
def close(self):
self.cursor.close()
self.conn.close()
def get_one(self, sql, params=()):
result = None
try:
self.connect()
self.cursor.execute(sql, params)
result = self.cursor.fetchone()
self.close()
except Exception as e:
print(e)
return result
def get_all(self, sql, params=()):
list_data = ()
try:
self.connect()
self.cursor.execute(sql, params)
list_data = self.cursor.fetchall()
self.close()
except Exception as e:
print(e)
return list_data
def delete_one(self, sql, params=()):
result = None
try:
self.connect()
self.cursor.execute(sql, params)
result = self.cursor.fetchone()
self.close()
except Exception as e:
print(e)
return result
if __name__ == '__main__':
host = "你的MySQL服务地址"
username = "账号"
password = "密码"
db = "数据库名称"
my_db = MysqlHelper(host=host, username=username, password=password, db=db)
# 获取单个
sql = 'SELECT name FROM `userinfo` where age > 25;'
result = my_db.get_one(sql)
print("result:{}".format(result))
# 获取多个
sql2 = 'SELECT name FROM `userinfo` where age > 25;'
result2 = my_db.get_all(sql2)
print("result2:{}".format(result2))
运行结果:
图片对测试而言:请使用查询和查询多个,慎用更新和删除,尽量通过接口进行更新和删除,除非万不得已。
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