python-pymysql常用功能封装

Posted 2023-01-26 lady_killer9

目录

• 简介
• 代码
• 测试
• 参考

简介

pymysql是一个客户端，本文进行一个简单封装，主要是结构化和批量操作

代码

import pymysql

class MysqlCli:
    def __init__(self,host,user,password,database,port=3306,charset='utf8',use_unicode=True):
        """
        初始化
        :param host:主机名
        :param user: 用户
        :param password: 密码
        :param database: 数据库
        :param port: 端口，默认3306
        :param charset: 字符集，默认utf8
        :param use_unicode: 使用unicode，默认True
        """
        try:
            self.connect=pymysql.connect(
                host=host,
                user=user,
                password=password,
                database=database,
                port=port,
                charset=charset,
                use_unicode=use_unicode
             )
            self.cursor = self.connect.cursor()
            print(f"连接数据库host database成功!!!")
        except Exception as e:
            print(f"init error: e")

    def close(self):
        self.cursor.close()
        self.connect.close()


    # 增删改（结构化）
    def operate(self,sql,params=None):
        try:
            self.cursor.executemany(sql,params)
            self.connect.commit()
        except Exception as e:
            print(f"operate error: e")
            self.connect.rollback()

    # 查询（结构化）
    def select(self,sql,params):
        try:
          tmp_cursor = self.connect.cursor(pymysql.cursors.DictCursor)
          tmp_cursor.execute(sql,params)
          res = tmp_cursor.fetchall()
          tmp_cursor.close()
          return res
        except Exception as e:
            print(f"select error: e")
            self.connect.rollback()

测试

上面代码放到了包sql_helper的helper.py中

from sql_helper.helper import MysqlCli
import uuid

if __name__ == '__main__':
    my_cli = MysqlCli(host="192.168.31.100", user="root", password="123456", database="peewee_learn")
    # 增加
    sql= "insert into users(id,name,age,gender,`desc`,time)VALUES(%s,%s,%s,%s,%s,%s)"
    print(sql)
    my_cli.operate(sql,[(str(uuid.uuid4()),'lady_killer',22,'1',"something","2023-01-25 19:39:37")])
    # 参数化查询
    sql = "select * from users where age = %s"
    res = my_cli.select(sql,18)
    print(res)

参考

github-pymysql
pymysql-docs