export & migration fix

lib/Doctrine/Export.php

@@ -908,7 +908,7 @@ class Doctrine_Export extends Doctrine_Connection_Module
     {
         $sql = '';
         if (isset($definition['name'])) {
-            $sql .= 'CONSTRAINT ' . $this->conn->quoteIdentifier($definition['name']) . ' ';
+            $sql .= ' ' . $this->conn->quoteIdentifier($definition['name']) . ' ';
         }
         $sql .= 'FOREIGN KEY (';
 

lib/Doctrine/Migration.php

@@ -418,7 +418,7 @@ class Doctrine_Migration
      * @param string $constraintName
      * @return void
      */
-    public function dropConstraint($tableName, $constraintName, $primary)
+    public function dropConstraint($tableName, $constraintName, $primary = false)
     {
         $options = get_defined_vars();