EC-CUBEに対して、DB接続の文字エンコーディングをDSNで指定するパッチです。

charset.patch

Index: data/class/db/SC_DB_DBFactory.php
===================================================================
--- data/class/db/SC_DB_DBFactory.php   (リビジョン 23329)
+++ data/class/db/SC_DB_DBFactory.php   (作業コピー)
@@ -70,7 +70,8 @@
                              'protocol' => 'tcp',
                              'hostspec' => DB_SERVER,
                              'port'     => DB_PORT,
-                             'database' => DB_NAME
+                             'database' => DB_NAME,
+                             'charset'  => 'utf8',
                              );
             } else {
                 return '';
Index: data/class/SC_Query.php
===================================================================
--- data/class/SC_Query.php     (リビジョン 23329)
+++ data/class/SC_Query.php     (作業コピー)
@@ -57,7 +57,8 @@
                          'protocol' => 'tcp',
                          'hostspec' => DB_SERVER,
                          'port'     => DB_PORT,
-                         'database' => DB_NAME
+                         'database' => DB_NAME,
+                         'charset'  => 'utf8',
                          );
         }
 
@@ -79,7 +80,6 @@
             $this->conn = MDB2::singleton($dsn, $options);
         }
         if (!PEAR::isError($this->conn)) {
-            $this->conn->setCharset('utf8');
             $this->conn->setFetchMode(MDB2_FETCHMODE_ASSOC);
         }