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msd2/tracking/piwik/core/Updater/Migration.php

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+<?php
+/**
+ * Piwik - free/libre analytics platform
+ *
+ * @link http://piwik.org
+ * @license http://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
+ */
+namespace Piwik\Updater;
+
+use Piwik\Db;
+use Exception;
+
+/**
+ * Base class for migrations. Any migration must extend this class.
+ *
+ * @api
+ */
+abstract class Migration
+{
+    /**
+     * Executes the migration.
+     * @return void
+     */
+    abstract public function exec();
+
+    /**
+     * Get a description of what the migration actually does. For example "Activate plugin $plugin" or
+     * "SELECT * FROM table".
+     *
+     * @return string
+     */
+    abstract public function __toString();
+
+    /**
+     * Decides whether an error should be ignored or not.
+     * @param Exception $exception
+     * @return bool
+     */
+    public function shouldIgnoreError($exception)
+    {
+        return false;
+    }
+}