add a import_from_database_via_pdo sample

example/import_from_database_via_pdo.php

@@ -0,0 +1,29 @@
+<?php
+
+require_once __DIR__.'/../vendor/autoload.php'; // load composer
+
+use Goodby\CSV\Import\Standard\Lexer;
+use Goodby\CSV\Import\Standard\Interpreter;
+use Goodby\CSV\Import\Standard\LexerConfig;
+
+$pdo = new PDO('mysql:host=localhost;dbname=test', 'root', 'root');
+$pdo->query('CREATE TABLE IF NOT EXISTS user (id INT, `name` VARCHAR(255), email VARCHAR(255))');
+
+$config = new LexerConfig();
+$lexer = new Lexer($config);
+
+$interpreter = new Interpreter();
+
+$interpreter->addObserver(function(array $columns) use ($pdo) {
+    $checkStmt = $pdo->prepare('SELECT count(*) FROM user WHERE id = ?');
+    $checkStmt->execute(array(($columns[0])));
+
+    $count = $checkStmt->fetchAll()[0][0];
+
+    if ($count === 0) {
+        $stmt = $pdo->prepare('INSERT INTO user (id, name, email) VALUES (?, ?, ?)');
+        $stmt->execute($columns);
+    }
+});
+
+$lexer->parse('user.csv', $interpreter);

example/user.csv

@@ -1,3 +1,3 @@
 1,alice,[email protected]
 2,bob,[email protected]
-3,carol,[email protected]
+3,carol,[email protected]