封装mysql数据库，写sql语句的

import pymysql
import threading

lock = threading.Lock()


class Db:
    def __init__(self):
        self.conn = pymysql.connect(host='localhost', port=3306, user='root', password='caobaofu5.9', charset='utf8',
                                    db='p10', cursorclass=pymysql.cursors.DictCursor)
        self.cursor = self.conn.cursor()

    # 添加
    def update(self, sql):
        self.cursor.execute(sql)
        self.conn.commit()
        #添加之后可用直接返回他的id
        return self.cursor.lastrowid

    # 查询单个
    def findone(self, sql):
        lock.acquire()
        self.cursor.execute(sql)
        lock.release()
        res = self.cursor.fetchone()
        return res

    # 查询所有
    def findall(self, sql):
        lock.acquire()
        self.cursor.execute(sql)
        lock.release()
        res = self.cursor.fetchall()
        return res

    def colse(self):
        self.cursor.close()
        self.conn.close()


db1 = Db()