Python 操作MySQL函数--复制粘贴就能用

import pymysql

class mysql (object):
    def __init__(self, dbconfig):
        """
        初始化连接信息
        :param dbconfig: 连接信息的字典
        """
        self.host = dbconfig[‘host‘]
        self.port = dbconfig[‘port‘]
        self.user = dbconfig[‘user‘]
        self.passwd = dbconfig[‘passwd‘]
        self.db = dbconfig[‘db‘]
        self.charset = dbconfig[‘charset‘]
        self._conn = None
        self._connect()
        self._cursor = self._conn.cursor ()

    def _connect(self):
        """
        连接数据库方法
        :return:
        """
        try:
            self._conn = pymysql.connect (host=self.host, port=self.port, user=self.user, passwd=self.passwd,
                                          db=self.db, charset=self.charset)
        except pymysql.Error as e:
            print(e)

    def query(self, sql):
        try:
            result = self._cursor.execute (sql)
        except pymysql.Error as e:
            print(e)
            result = False
        return result

    def select(self, table, column=‘*‘, condition=‘‘):
        """
        查询数据库方法
        :param table: 库里面的表
        :param column: 列字段
        :param condition: 条件语句 （where id=1）
        :return:
        """
        condition = ‘ where ‘ + condition if condition else None
        if condition:
            sql = "select %s from %s %s" % (column, table, condition)
            # print(sql)
        else:
            sql = "select %s from %s" %(column, table)
            # print(sql)
        self.query (sql)
        return self._cursor.fetchall()


    def insert(self,table,tdict):
        """
        插入数据库方法，replace去重插入  insert不去重插入
        :param table: 表名
        :param tdict: 要插入的字典
        :return:
        """
        column = ‘‘
        value = ‘‘
        for key in tdict:
            column += ‘,‘ + key
            value += "‘,‘" + tdict[key]
        column = column[1:]
        value = value[2:] + "‘"

        sql = "replace into %s(%s) values(%s)" %(table,column,value)    # 去重
        # sql = "insert into %s(%s) values(%s)" %(table,column,value)   # 不去重
        self._cursor.execute(sql)
        self._conn.commit()
        return self._cursor.lastrowid

    def update(self,table,tdict,condition=‘‘):
        """
        更新数据库方法
        :param table: 表名
        :param tdict: 更新数据库数据字典
        :param condition: 条件语句 （where id=1）
        :return:
        """
        if not condition:
            print(‘must have id‘)
            exit()
        else:
            condition = ‘where ‘ + condition
        value = ‘‘
        for key in tdict:
            value += ",%s=‘%s‘" %(key,tdict[key])
        value = value[1:]
        sql = "update %s set %s %s" %(table,value,condition)
        # print(sql)
        self._cursor.execute(sql)
        self._conn.commit()
        return self.affected_num()

    def delete(self,table,condition=‘‘):
        """
        删除方法
        :param table: 表名
        :param condition: 条件语句 （where id=1）
        :return:
        """
        condition = ‘ where ‘ + condition if condition else None
        sql = "delete from %s %s" %(table,condition)
        # print(sql)
        self._cursor.execute(sql)
        self._conn.commit()
        return self.affected_num()

    def all(self,*args):
        """
        可以执行所有的SQL语句 相当于登录到数据库执行，就是返回结果没有做处理 后期会更新
        :param args: SQL 语句(select * from ssh)
        :return:
        """
        sql = input("请输入SQL语句>>:")
        sql = "%s" %sql
        self._cursor.execute (sql)
        self._conn.commit ()
        return self._cursor.fetchall ()


    def rollback(self):
        """
        数据库的事务
        :return:
        """
        self._conn.rollback()


    def affected_num(self):
        """
        受影响的条数
        :return:
        """
        return self._cursor.rowcount


    def int_to_ip_or_ip_to_int(self,method,num,ip=‘‘):
        """
        主要是对数据库的IP和数值之间的转换
        :param method: 转换方法两种(inet_ntoa,inet_aton)
        :param num: 数值
        :param ip: IP地址
        :return:
        """
        if method == ‘inet_ntoa‘:
            sql = "select %s(%s)" %(method,num)
        elif method == ‘inet_aton‘:
            sql = "select %s(%s)" %(method,ip)
        self.query(sql)
        return self._cursor.fetchall()

    def __del__(self):
        """
        关闭连接
        :return:
        """
        try:
            self._cursor.close ()
            self._conn.close ()
        except:
            pass

    def close(self):
        """
        关闭连接
        :return:
        """
        self.__del__ ()


# 函数的使用
if __name__ == ‘__main__‘:
    dbconfig = {
        ‘host‘: ‘192.168.163.129‘,      # MySQL地址
        ‘port‘: 3306,                          # 端口
        ‘user‘: ‘root‘,                          # 用户名
        ‘passwd‘: ‘123456‘,                # 密码
        ‘db‘: ‘com_hosts‘,                   # 数据库
        ‘charset‘: ‘utf8‘,                     # 字符集
    }
    db = mysql (dbconfig)                # 初始化函数
    
    # 查询
    print(db.select (‘ssh‘))
    # 更新
    print(db.update(‘ssh‘, tdict, ‘Id=2‘))
    # 插入
    print(db.insert(‘ssh‘,tdict))
    # 删除
    print(db.delete(‘ssh‘,‘Id=6‘))

    # 执行SQL语句
    while True:
        a = db.all()
        for i in a:
            print(i)