Python3数据库封装

# coding=utf-8
__author__ = "leslie"
import pymysql,pymysql.err
from CaseApi.common.readConfig import read
from CaseApi.common.caseLog import Log

class MysqlDb:
    def __init__(self):
        self.log = Log() # 实例化日志类
    def __db(self):
　　　　 '''定义私有方法连接数据库'''
        host = read('mysql','host')
        user = read('mysql','user')
        password = read('mysql','password')
        database = read('mysql','db')
        try:
            self.db = pymysql.connect(host,user,password,database)
            return self.db
        except Exception as e:
            self.log.error ("链接出错: %s"%e)
        # self.__db = pymysql.connect(host, user, password, database)
        # return self.__db

    def select(self,form,table,condition):
        sql = '''select {} from {} {};'''.format(form,table,condition)
        self.log.info(sql)
        cursor = self.__db().cursor()
        try:
            cursor.execute(sql)
            result = cursor.fetchall()
            self.__db().close()
            self.log.debug(result)
            list = []
            for i in result:
                date = {}
                date['user'] = i[0]
                date['psw'] = i[1]
                date['mail'] = i[2]
                list.append(date)
            return list
        except Exception as e:
            self.log.error(e)

    def insert(self,table):
        sql = '''insert into %s;'''%table
        self.log.info(sql)
        cursor = self.__db().cursor()
        try:
            cursor.execute(sql)
            self.__db().commit()
            self.__db().close()
        except Exception as e:
            self.log.error(e)

    def update(self,table,condition):
        sql = '''update {} set {};'''.format(table,condition)
        self.log.info(sql)
        cursor = self.__db().cursor()
        try:
            cursor.execute(sql)
            self.__db().commit()
            self.__db().close()
        except Exception as e:
            self.log.error(e)

    def delete(self,table,condition):
        sql = '''delete from {} {};'''.format(table,condition)
        self.log.info(sql)
        cursor = self.__db().cursor()
        try:
            cursor.execute(sql)
            self.__db().commit()
            self.__db().close()
        except Exception as e:
            self.log.error(e)