Index: branches/version-2_5-dev/html/install/index.php
===================================================================
--- branches/version-2_5-dev/html/install/index.php	(revision 19670)
+++ branches/version-2_5-dev/html/install/index.php	(revision 19675)
@@ -798,14 +798,14 @@
     $options['debug'] = PEAR_DB_DEBUG;
     $objDB = MDB2::connect($dsn, $options);
-    $objDB->loadModule('Manager');
+    $objManager =& $objDB->loadModule('Manager');
 
     // 接続エラー
     if (!PEAR::isError($objDB)) {
 
-        $exists = $objDB->listSequences();
+        $exists = $objManager->listSequences();
         foreach ($arrSequences as $seq) {
             $seq_name = $seq[0] . "_" . $seq[1];
             if (in_array($seq_name, $exists)) {
-                $result = $objDB->dropSequence($seq_name);
+                $result = $objManager->dropSequence($seq_name);
                 if (PEAR::isError($result)) {
                     $arrErr['all'] = ">> " . $result->message . "<br />";
@@ -836,10 +836,10 @@
     $options['debug'] = PEAR_DB_DEBUG;
     $objDB = MDB2::connect($dsn, $options);
-    $objDB->loadModule('Manager');
+    $objManager =& $objDB->loadModule('Manager');
 
     // 接続エラー
     if (!PEAR::isError($objDB)) {
 
-        $exists = $objDB->listSequences();
+        $exists = $objManager->listSequences();
         foreach ($arrSequences as $seq) {
             $res = $objDB->query("SELECT max(" . $seq[1] . ") FROM ". $seq[0]);
@@ -852,5 +852,5 @@
 
             $seq_name = $seq[0] . "_" . $seq[1];
-            $result = $objDB->createSequence($seq_name, $max + 1);
+            $result = $objManager->createSequence($seq_name, $max + 1);
             if (PEAR::isError($result)) {
                 $arrErr['all'] = ">> " . $result->message . "<br />";
Index: branches/version-2_5-dev/html/install/sql/create_table_mysql.sql
===================================================================
--- branches/version-2_5-dev/html/install/sql/create_table_mysql.sql	(revision 19671)
+++ branches/version-2_5-dev/html/install/sql/create_table_mysql.sql	(revision 19675)
@@ -1252,8 +1252,8 @@
 CREATE TABLE dtb_plugin (
   plugin_id INT NOT NULL,
-  plugin_name VARCHAR(255) NOT NULL DEFAULT "",
+  plugin_name VARCHAR(255) NOT NULL DEFAULT '',
   enable INT NOT NULL DEFAULT 0,
   del_flg INT NOT NULL DEFAULT 0,
-  class_name VARCHAR(255) NOT NULL DEFAULT NULL,
+  class_name VARCHAR(255) NOT NULL DEFAULT '',
   create_date DATETIME NOT NULL,
   update_date DATETIME NOT NULL,