diff --git a/lib/Doctrine/Connection/Firebird.php b/lib/Doctrine/Connection/Firebird.php
index 98564fd01..64d09bc10 100644
--- a/lib/Doctrine/Connection/Firebird.php
+++ b/lib/Doctrine/Connection/Firebird.php
@@ -85,7 +85,7 @@ class Doctrine_Connection_Firebird extends Doctrine_Connection {
      *                  'rw'   => 'READ WRITE' | 'READ ONLY'
      * @return void
      */
-    function setTransactionIsolation($isolation, $options = array()) {
+    public function setTransactionIsolation($isolation, $options = array()) {
         switch ($isolation) {
             case 'READ UNCOMMITTED':
                 $ibase_isolation = 'READ COMMITTED RECORD_VERSION';
diff --git a/lib/Doctrine/Connection/Mysql.php b/lib/Doctrine/Connection/Mysql.php
index c2efa8090..057ce1d99 100644
--- a/lib/Doctrine/Connection/Mysql.php
+++ b/lib/Doctrine/Connection/Mysql.php
@@ -111,26 +111,4 @@ class Doctrine_Connection_Mysql extends Doctrine_Connection_Common {
         $query = "SET SESSION TRANSACTION ISOLATION LEVEL $isolation";
         return $this->dbh->query($query);
     }
-    /**
-     * Returns string to concatenate two or more string parameters
-     *
-     * @param string $value1
-     * @param string $value2
-     * @param string $values...
-     * @return string               a concatenation of two or more strings
-     */
-    public function concat($value1, $value2) {
-        $args = func_get_args();
-        return "CONCAT(".implode(', ', $args).")";
-    }
-    /**
-     * returns the state of this connection
-     *
-     * @see Doctrine_Connection_Transaction::STATE_* constants
-     * @return integer          the connection state
-     */
-    public function getState() {
-        return 0; // @todo FIXME not working!
-    }
 }
-