class MySQLCursor:
    """创建一个游标类"""

    def __init__(self,cursor,logger):
        self.cursor=cursor
        self.logger=logger

    def execute(self,sql,params=None):
        self.logger.info(sql+str(params))
        self.cursor.execute(sql, params)
        self.cursor.execute("select last_insert_id()")
        res = self.cursor.fetchone()
        if len(res)==1:
            if type(res)==type({}):
                return res['last_insert_id()']
            if type(res)==type(()):
                return res[0]
        return  0

    def query(self,sql,params=None,with_description=False):
        self.logger.info(sql+str(params))
        self.cursor.execute(sql, params)
        rows = self.cursor.fetchall()
        if with_description:
            res = rows, self.cursor.description
        else:
            res = rows
        return res

class MySQLInstance:
    """创建一个实例类"""

    def __init__(self,host,port,username,password,schema=None,
                 charset='utf8',dict_result=False,logger=None):
        self.host=host
        self.port=port
        self.username=username
        self.password=password
        self.schema=schema
        self.charset=charset
        self.dict_result=dict_result
        if logger is None:
            logger=logging.getLogger(__name__)
        self.logger=logger

    def __enter__(self):
        self.con=pymysql.connect(host=self.host,port=self.port,user=self.username,
                                 password=self.password,charset=self.charset,db=self.schema)
        if self.dict_result:
            self.cursor=self.con.cursor(pymysql.cursors.DictCursor)
        else:
            self.cursor=self.con.cursor()
        return MySQLCursor(self.cursor,self.logger)
    def __exit__(self,exc_type, exc_value, exc_tb):
        self.cursor.execute("commit")
        self.cursor.close()
        self.con.close()