Actually I'm trying to fetch data in listview from mssql server

My python code

 @api.depends('bio')
    def _get_chk_out(self):
        for record in self:
            conn = pyodbc.connect('DRIVER={SQL Server};SERVER=OWNER-PC\SQLEXPRESS;DATABASE=etimetracklite;UID=test;PWD=rimt')
            cr = conn.cursor()
            b_id=record.bio
            current=datetime.datetime.now().date()
            back_thirty=current-datetime.timedelta(days=30)
            back_thirty=back_thirty.strftime("%Y-%m-%d")
           
            cr.execute("select OutTime from AttendanceLogs where EmployeeId=? AND AttendanceDate Between ? AND ?", b_id,str(back_thirty),str(current))
        
            if(cr.fetchone()==None):
                record.chk_out='-'
            else:
                rows = cr.fetchall()

                _logger.info('INFO GG %s',rows)
                for i in rows:
                    record.chk_out = i[0]

but it display only one row in listview...