猿创征文｜Python基础——Visual Studio版本——DBHelper-MySQL版本

pip3 config set global.index-url https://repo.huaweicloud.com/repository/pypi/simple
pip3 config list
pip3 install --upgrade pip
pip3 install pymysql

import pymysql
class DBHelper():
    def __init__(self):
        # 数据库连接参数
        self.host = "rm-bp1zq3879r28p726lco.mysql.rds.aliyuncs.com"
        self.user = "qwe8403000"
        self.pwd = "Qwe8403000"
        self.db = "mytest"
        self.charset = "utf-8"
    # 获取游标
    def getConnect(self):
        if not self.db:
            raise(NameError, "没有设置数据库信息")
        self.conn = pymysql.connect(host=self.host, port=3306, user=self.user, passwd=self.pwd, db=self.db, charset="utf8mb4")
        # 按照字典的方式返回
        cursor = self.conn.cursor(cursor=pymysql.cursors.DictCursor)
        if not cursor:
            raise(NameError, "连接数据库失败")
        else:
            return cursor
    # 查
    def query(self, sql):
        cursor = self.getConnect()
        cursor.execute(sql)
        result = cursor.fetchall()  # 获取查询的所有数据
        # 查询完毕后必须关闭连接
        self.conn.close()
        return result
   # 增删改查
    def excute(self, sql):
        cursor = self.getConnect()
        cursor.execute(sql)
        self.conn.commit()
        self.conn.close()

from DBHelper import DBHelper
db=DBHelper()
db.excute("sql")
result=db.query("sql")
print(result)