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How to use _local_execute method in fMBT

Best Python code snippet using fMBT_python

task_executor.py

Source:task_executor.py

...17        self.local_schema = None18        self.global_schema = None19        self.node_id = node_id20        self.iternum = 021    async def _local_execute(self, local, sqlscript, insert):22        if not insert:23            query = (24                "delete from "25                + self.localtable26                + "_"27                + str(self.node_id)28                + "; insert into "29                + self.localtable30                + "_"31                + str(self.node_id)32                + " select "+ str(self.node_id) +" as node_id, * from ("33                + sqlscript34                + ") inputquery;"35            )36        else:37            query = (38                    "insert into "39                    + self.localtable40                    + "_"41                    + str(self.node_id)42                    + " select "+str(self.node_id)+" as node_id, * from ("43                    + sqlscript44                    + ") inputquery;"45            )46        await local.cursor().execute(query)47    async def _create_view(self, local, attributes, table, filterpart, vals):48        if filterpart == " ":49            query = (50                "CREATE VIEW "51                + self.viewlocaltable52                + " AS select "53                + ",".join(attributes)54                + " from "55                + table56                + ";"57            )58            await local.cursor().execute(query)59        else:60            query = (61                "CREATE VIEW "62                + self.viewlocaltable63                + " AS select "64                + ",".join(attributes)65                + " from "66                + table67                + " where "68                + filterpart69                + ";"70            )71            await local.cursor().execute(query, vals)72    async def _initialize_local_schema(self):73        query = "drop table if exists %s; create table %s (node_id INT, %s);" % (74            self.localtable + "_" + str(self.node_id),75            self.localtable + "_" + str(self.node_id),76            self.local_schema,77        )78        await self.db_objects["local"]["async_con"].cursor().execute(query)79    def create_task_generator(self, algorithm):80        return algorithm(81            self.viewlocaltable,82            self.globaltable,83            self.parameters,84            self.attributes,85            self.globalresulttable86        )87    async def init_global_remote_table(self, global_schema):88        await self.transfer_runner.initialize_local(global_schema)89    async def init_tables(self, local_schema, global_schema):90        self.local_schema = local_schema91        await self._initialize_local_schema()92        await self.transfer_runner.initialize_local(global_schema)93    # parameters binding is an important processing step on the parameters that will be concatenated in an SQL query94    # to avoid SQL injection vulnerabilities. This step is not implemented for postgres yet but only for monetdb95    # so algorithms that contain parameters (other than attribute names) will raise an exception if running with postgres96    def bindparameters(self, parameters):97        boundparam = []98        for i in parameters:99            if isinstance(i, (int, float, complex)):100                boundparam.append(i)101            else:102                boudparam.append(self.db_objects["global"]["async_con"].bind_str(i))103        return boundparam104    async def createlocalviews(self):105        t1 = current_time()106        table = self.params["table"]107        attributes = []108        for attribute in self.params["attributes"]:109            attributes.append(attribute)110        for formula in self.params["filters"]:111            for attribute in formula:112                if attribute[0] not in attributes:113                    attributes.append(attribute[0])114        await self.db_objects["local"]["async_con"].check_for_params(table, attributes)115        filterpart = " "116        vals = []117        for j, formula in enumerate(self.params["filters"]):118            andpart = " "119            for i, filt in enumerate(formula):120                if filt[1] not in [">", "<", "<>", ">=", "<=", "="]:121                    raise Exception("Operator " + filt[1] + " not valid")122                andpart += filt[0] + filt[1] + "%s"123                vals.append(filt[2])124                if i < len(formula) - 1:125                    andpart += " and "126            if andpart != " ":127                filterpart += "(" + andpart + ")"128            if j < len(self.params["filters"]) - 1:129                filterpart += " or "130        await self._create_view(131                self.db_objects["local"]["async_con"],132                self.params["attributes"],133                self.params["table"],134                filterpart,135                vals,136            )137        print("time " + str(current_time() - t1))138    #### run a task on all local nodes and sets up the transfer of the results to global node139    async def task_local(self, schema, static_schema, sqlscript):140        t1 = current_time()141       # insert = False142       # if 'iternum'  in  schema:143       #     insert = True144       # if self.local_schema == None or self.local_schema != schema:145       #     self.local_schema = schema146       #     await self._initialize_local_schema()147       #     await self.transfer_runner.initialize_local(self.local_schema)148        if int(static_schema):149            await self._local_execute(self.db_objects["local"]["async_con"], sqlscript, 0)150        else:151            self.local_schema = schema152            await self._initialize_local_schema()153            await self._local_execute(self.db_objects["local"]["async_con"], sqlscript, 0)154        ## for debug, print local contents155        #for id, local in enumerate(self.db_objects["local"]):156        #    result = await local["async_con"].cursor().execute("select * from %s_%s;" % (self.localtable, str(id)))157        print("time " + str(current_time() - t1))158    async def get_global_result(self):159        cur = self.db_objects["local"]["async_con"].cursor()160        query = f'select * from {self.globalresulttable};'161        await cur.execute(query)162        return await cur.fetchall()163    async def register_udf(self, udf):164        # this is not implemented165        await self.db_objects["local"]["async_con"].create_function(udf)166    async def clean_up(self):167        await self.db_objects["local"]["async_con"].clean_tables(self.db_objects, self.globaltable, self.localtable+"_"+str(self.node_id), self.viewlocaltable+"_"+str(self.node_id), self.globalresulttable)

transactional.py

Source:transactional.py

...82                                  action._topic,83                                  action._tag)84        prepared = AsyncEventValue()85        def _send(producer):86            def _local_execute(msg, user_args):87                run_coroutine_threadsafe(prepared.set(SendStatus.OK), loop)88                # return TransactionStatus.UNKNOWN89                return self._transaction_status.wait()90            try:91                ret = producer.send_message_in_transaction(92                    msg_obj, _local_execute, None)93                if ret.status != SendStatus.OK:94                    run_coroutine_threadsafe(prepared.set(ret.status), loop)95            except Exception as exc:96                run_coroutine_threadsafe(prepared.set(exc), loop)97        producer_executor.submit(_send, action.get_producer())98        send_status = await prepared.wait()99        if send_status == SendStatus.OK:100            return...

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