added database cache option

docs/changelog/6.x.x.txt

@@ -1,5 +1,6 @@
 6.99.0
  - Added archive/unarchive options to CS threads.
+ - Added a database cache option as an alternative to memcached.
  - Added a workflow system.
  - Added a workflow scheduler system.
  - Converted the runHourly.pl scripts to run as scheduled workflows. 

docs/upgrades/upgrade_6.8.7-6.99.0.pl

@@ -35,9 +35,22 @@ ipsToCIDR();
 addDisabletoRichEditor();
 addNavigationMimeType();
 addIndexes();
+addDatabaseCache();
 
 finish($session); # this line required
 
+#-------------------------------------------------
+sub addDatabaseCache {
+	print "\tAdding database cache.\n";
+	$session->db->write("create table cache ( namespace varchar(128) not null, cachekey varchar(128) not null, expires bigint not null, size int not null, content mediumtext, primary key (namespace, cachekey))");
+	$session->db->write("alter table cache add index namespace_cachekey_size (namespace,cachekey,expires)");
+	if ($session->config->get("memcached_servers")) {
+		$session->config->set("cacheType","WebGUI::Cache::Memcached");
+	} else {
+		$session->config->set("cacheType","WebGUI::Cache::FileCache");
+	}
+}
+
 #-------------------------------------------------
 sub addIndexes {
 	print "\tAdding indexes to increase performance.\n";