def execute( self, conn, daoinput, transaction = False ):
        """
        daoinput must be validated to have the following keys:
        child_parent_id__list[[cid, pid],...], block_name
        """
        binds = {} 
        bindlist=[]
        
        if isinstance(daoinput, dict) and "block_name" in daoinput.keys():
            binds = {"block_name": daoinput["block_name"]}
            r = self.dbi.processData(self.sql_sel, binds, conn, False)
            bfile = self.format(r)
            bfile_list = []
            for f in bfile:
                bfile_list.append(f[0])           
            if "child_parent_id_list" in daoinput.keys():
                files = []
                for i in daoinput["child_parent_id_list"]:
                    files.append(i[0])
                if set(files)-set(bfile_list):
                    dbsExceptionHandler('dbsException-invalid-input2', "Files required in the same block for FileParent/insert2 dao.", self.logger.exception) 
            else:
                dbsExceptionHandler('dbsException-invalid-input2', "child_parent_id_list required for FileParent/insert2 dao.", self.logger.exception) 
        else:
            dbsExceptionHandler('dbsException-invalid-input2', "Block_name required in the same block for FileParent/insert2 dao.", self.logger.exception)
        binds = {} 
        for pf in daoinput["child_parent_id_list"]:
            binds = {"this_file_id":pf[0], "parent_file_id": pf[1]}
            bindlist.append(binds) 
        self.dbi.processData(self.sql, bindlist, conn, transaction)