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include/condorcet/Examples/Specifics_Examples/use_large_election_external_database_drivers.php

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+<?php
+
+declare(strict_types=1);
+
+/* NO INTERFACE here, see html examples for it */
+
+# Quick tour of the main features of Condorcet PHP
+
+// I - Install
+    use CondorcetPHP\Condorcet\{Candidate, Condorcet, Election};
+    use CondorcetPHP\Condorcet\DataManager\DataHandlerDrivers\PdoDriver\PdoHandlerDriver;
+
+    require_once __DIR__.'/../../__CondorcetAutoload.php';
+
+    $start_time = microtime(true);
+
+
+ // II - Create Election
+
+    $myElection = new Election;
+
+    $myElection->addCandidate(new Candidate('A'));
+    $myElection->addCandidate(new Candidate('B'));
+    $myElection->addCandidate(new Candidate('C'));
+    $myElection->addCandidate(new Candidate('D'));
+    $myElection->addCandidate(new Candidate('E'));
+    $myElection->addCandidate(new Candidate('F'));
+
+ // II - Setup external drivers
+
+    /* We will use PDO SQLITE, but can be MySQL or else */
+
+    if (file_exists(__DIR__.'/bdd.sqlite')) {
+        unlink(__DIR__.'/bdd.sqlite');
+    }
+
+    $pdo_object = new \PDO('sqlite:'.__DIR__.'/bdd.sqlite');
+    $database_map = ['tableName' => 'Entities', 'primaryColumnName' => 'id', 'dataColumnName' => 'data'];
+
+    $driver = new PdoHandlerDriver(bdd: $pdo_object, tryCreateTable: true, struct: $database_map); // true = Try to create table
+
+    $myElection->setExternalDataHandler($driver);
+
+// III - Add hundred of thousands votes
+
+    set_time_limit(60 * 5);
+
+    $howMany = 100000;
+
+    $voteModel = $myElection->getCandidatesList();
+
+    for ($i = 0; $i < $howMany; $i++) {
+        shuffle($voteModel);
+        $myElection->addVote($voteModel);
+    }
+
+
+// IV - Get somes results
+
+    $myElection->getWinner();
+
+    $myElection->getResult('Schulze');
+
+
+print 'Success!
+Process in: '. round(microtime(true) - $start_time, 2) . "s\n";
+
+echo ' Peak of memory allocated : '.round(memory_get_peak_usage()/1024** ($i=floor(log(memory_get_peak_usage(), 1024))), 2).' '.['b', 'kb', 'mb', 'gb', 'tb', 'pb'][$i]."\n\n";
+
+
+// Optionally. You can close external driver and and retrieve data into classical internal RAM memory, if there is enough space...
+# $myElection->closeHandler();