add piwik installation

www/analytics/core/Updates/2.0-a12.php

@@ -0,0 +1,48 @@
+<?php
+/**
+ * Piwik - Open source web analytics
+ *
+ * @link http://piwik.org
+ * @license http://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
+ *
+ */
+namespace Piwik\Updates;
+
+use Piwik\Common;
+use Piwik\Db;
+use Piwik\Updater;
+use Piwik\Updates;
+
+/**
+ */
+class Updates_2_0_a12 extends Updates
+{
+    public static function getSql()
+    {
+        $result = array(
+            'ALTER TABLE ' . Common::prefixTable('logger_message') . ' MODIFY level VARCHAR(16) NULL' => false
+        );
+
+        $unneededLogTables = array('logger_exception', 'logger_error', 'logger_api_call');
+        foreach ($unneededLogTables as $table) {
+            $tableName = Common::prefixTable($table);
+
+            try {
+                $rows = Db::fetchOne("SELECT COUNT(*) FROM $tableName");
+                if ($rows == 0) {
+                    $result["DROP TABLE $tableName"] = false;
+                }
+            } catch (\Exception $ex) {
+                // ignore
+            }
+        }
+
+        return $result;
+    }
+
+    public static function update()
+    {
+        // change level column in logger_message table to string & remove other logging tables if empty
+        Updater::updateDatabase(__FILE__, self::getSql());
+    }
+}