From 7638c8de703850ef1a13c8ab0147b65e453bb173 Mon Sep 17 00:00:00 2001
From: shish <shish@7f39781d-f577-437e-ae19-be835c7a54ca>
Date: Fri, 6 Jul 2007 04:02:24 +0000
Subject: [PATCH] database schema upgrader

git-svn-id: file:///home/shish/svn/shimmie2/trunk@231 7f39781d-f577-437e-ae19-be835c7a54ca
---
 ext/upgrade/main.php | 66 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 66 insertions(+)
 create mode 100644 ext/upgrade/main.php

diff --git a/ext/upgrade/main.php b/ext/upgrade/main.php
new file mode 100644
index 00000000..0abdcc8a
--- /dev/null
+++ b/ext/upgrade/main.php
@@ -0,0 +1,66 @@
+<?php
+
+class Upgrade extends Extension {
+	public function receive_event($event) {
+		if(is_a($event, 'InitExtEvent')) {
+			$this->do_things();
+		}
+	}
+
+	private function do_things() {
+		global $config;
+		global $database;
+
+		if($config->get_bool("in_upgrade")) {
+			return;
+		}
+		
+
+		if(!is_numeric($config->get_string("db_version"))) {
+			$config->set_int("db_version", 2);
+		}
+
+		if($config->get_int("db_version") == 2) {
+			$database->Execute("CREATE TABLE layout (
+				title varchar(64) primary key not null,
+				section varchar(32) not null default \"left\",
+				position int not null default 50,
+				visible enum('Y', 'N') default 'Y' not null
+			)");
+			$config->set_int("db_version", 3);
+		}
+
+		if($config->get_int("db_version") == 3) {
+			$config->set_bool("in_upgrade", true);
+			$database->Execute("RENAME TABLE tags TO old_tags");
+			$database->Execute("CREATE TABLE tags (
+				id int not null auto_increment primary key,
+				tag varchar(64) not null unique,
+				count int not null default 0,
+				KEY tags_count(count)
+			)");
+			$database->Execute("CREATE TABLE image_tags (
+				image_id int NOT NULL default 0,
+				tag_id int NOT NULL default 0,
+				UNIQUE KEY image_id_tag_id (image_id,tag_id),
+				KEY tags_tag_id (tag_id),
+				KEY tags_image_id (image_id)
+			)");
+			$config->set_int("db_version", 4);
+			$config->set_bool("in_upgrade", false);
+		}
+		
+		if($config->get_int("db_version") == 4) {
+			$config->set_bool("in_upgrade", true);
+			$database->Execute("DELETE FROM tags");
+			$database->Execute("INSERT INTO tags(tag) SELECT DISTINCT tag FROM old_tags");
+			$database->Execute("DELETE FROM image_tags");
+			$database->Execute("INSERT INTO image_tags(image_id, tag_id) SELECT old_tags.image_id, tags.id FROM old_tags JOIN tags ON old_tags.tag = tags.tag");
+			$database->Execute("UPDATE tags SET count=(SELECT COUNT(image_id) FROM image_tags WHERE tag_id=tags.id GROUP BY tag_id)");
+			$config->set_int("db_version", 5);
+			$config->set_bool("in_upgrade", false);
+		}
+	}
+}
+add_event_listener(new Upgrade(), 5);
+?>