diff --git a/lib/Doctrine/Export/Firebird.php b/lib/Doctrine/Export/Firebird.php
index 5e01aea9a..0eff4a6df 100644
--- a/lib/Doctrine/Export/Firebird.php
+++ b/lib/Doctrine/Export/Firebird.php
@@ -403,7 +403,7 @@ class Doctrine_Export_Firebird extends Doctrine_Export
      *                                    )
      * @return void
      */
-    public function createIndex($table, $name, array $definition)
+    public function createIndexSql($table, $name, array $definition)
     {
         $query = 'CREATE';
 
@@ -429,9 +429,7 @@ class Doctrine_Export_Firebird extends Doctrine_Export
         }
         $query .= ' ('.implode(', ', $fields) . ')';
 
-        $result = $this->conn->exec($query);
-        // todo: $this->_silentCommit();
-        return $result;
+        return $query;
     }
     /**
      * create a constraint on a table
diff --git a/lib/Doctrine/Export/Frontbase.php b/lib/Doctrine/Export/Frontbase.php
index 343e0ace7..568aa5071 100644
--- a/lib/Doctrine/Export/Frontbase.php
+++ b/lib/Doctrine/Export/Frontbase.php
@@ -37,39 +37,35 @@ class Doctrine_Export_Frontbase extends Doctrine_Export
      * create a new database
      *
      * @param string $name name of the database that should be created
-     * @return boolean
+     * @return string
      */
-    public function createDatabase($name)
+    public function createDatabaseSql($name)
     {
         $name  = $this->conn->quoteIdentifier($name, true);
-        $query = 'CREATE DATABASE ' . $name;
-
-        return $this->conn->exec($query);
+        return 'CREATE DATABASE ' . $name;
     }
     /**
      * drop an existing database
      *
      * @param string $name name of the database that should be dropped
-     * @return boolean
+     * @return string
      */
-    public function dropDatabase($name)
+    public function dropDatabaseSql($name)
     {
         $name  = $this->conn->quoteIdentifier($name, true);
-        $query = 'DELETE DATABASE ' . $name;
-
-        return $this->conn->exec($query);
+        return 'DELETE DATABASE ' . $name;    
     }
     /**
      * drop an existing table
      *
      * @param object $this->conns        database object that is extended by this class
      * @param string $name       name of the table that should be dropped
-     * @return integer
+     * @return string
      */
-    public function dropTable($name)
+    public function dropTableSql($name)
     {
         $name = $this->conn->quoteIdentifier($name, true);
-        return $this->conn->exec('DROP TABLE ' . $name . ' CASCADE');
+        return 'DROP TABLE ' . $name . ' CASCADE';
     }
     /**
      * alter an existing table
@@ -289,13 +285,13 @@ class Doctrine_Export_Frontbase extends Doctrine_Export
      * drop existing sequence
      *
      * @param string $seqName       name of the sequence to be dropped
-     * @return boolean
+     * @return string
      */
-    public function dropSequence($seqName)
+    public function dropSequenceSql($seqName)
     {
         $sequenceName = $this->conn->quoteIdentifier($this->conn->getSequenceName($seqName), true);
 
-        return $this->conn->exec('DROP TABLE ' . $sequenceName . ' CASCADE');
+        return 'DROP TABLE ' . $sequenceName . ' CASCADE';
     }
     /**
      * drop existing index
@@ -304,11 +300,11 @@ class Doctrine_Export_Frontbase extends Doctrine_Export
      * @param string    $name         name of the index to be dropped
      * @return boolean
      */
-    public function dropIndex($table, $name)
+    public function dropIndexSql($table, $name)
     {
         $table = $this->conn->quoteIdentifier($table, true);
         $name = $this->conn->quoteIdentifier($this->conn->getIndexName($name), true);
 
-        return $this->conn->exec('ALTER TABLE ' . $table . ' DROP INDEX ' . $name);
+        return 'ALTER TABLE ' . $table . ' DROP INDEX ' . $name;
     }
 }
diff --git a/lib/Doctrine/Export/Mssql.php b/lib/Doctrine/Export/Mssql.php
index 68ba5b796..40ef6a9ec 100644
--- a/lib/Doctrine/Export/Mssql.php
+++ b/lib/Doctrine/Export/Mssql.php
@@ -72,8 +72,7 @@ class Doctrine_Export_Mssql extends Doctrine_Export
     public function getTemporaryTableQuery()
     {
         return '';
-    }
-
+    }  
     /**
      * alter an existing table
      *
diff --git a/lib/Doctrine/Export/Mysql.php b/lib/Doctrine/Export/Mysql.php
index 3bdb04a2d..5349cf1d0 100644
--- a/lib/Doctrine/Export/Mysql.php
+++ b/lib/Doctrine/Export/Mysql.php
@@ -95,11 +95,7 @@ class Doctrine_Export_Mysql extends Doctrine_Export
     {
     	$sql = $this->createTableSql($name, $fields, $options);
 
-        $this->conn->exec('SET FOREIGN_KEY_CHECKS = 0');	
-        
         $this->conn->execute($sql);
-    
-        $this->conn->exec('SET FOREIGN_KEY_CHECKS = 1');
     }
     /**
      * create a new table
@@ -615,10 +611,10 @@ class Doctrine_Export_Mysql extends Doctrine_Export
         if (!empty($definition['match'])) {
             $query .= ' MATCH ' . $definition['match'];
         }
-        if (!empty($definition['on_update'])) {
+        if (!empty($definition['onUpdate'])) {
             $query .= ' ON UPDATE ' . $this->getForeignKeyRefentialAction($definition['onUpdate']);
         }
-        if (!empty($definition['on_delete'])) {
+        if (!empty($definition['onDelete'])) {
             $query .= ' ON DELETE ' . $this->getForeignKeyRefentialAction($definition['onDelete']);
         }
         return $query;
@@ -630,11 +626,11 @@ class Doctrine_Export_Mysql extends Doctrine_Export
      * @param string    $name           name of the index to be dropped
      * @return void
      */
-    public function dropIndex($table, $name)
+    public function dropIndexSql($table, $name)
     {
         $table  = $this->conn->quoteIdentifier($table, true);
         $name   = $this->conn->quoteIdentifier($this->conn->formatter->getIndexName($name), true);
-        return $this->conn->exec('DROP INDEX ' . $name . ' ON ' . $table);
+        return 'DROP INDEX ' . $name . ' ON ' . $table;
     }
     /**
      * dropTable
@@ -643,10 +639,10 @@ class Doctrine_Export_Mysql extends Doctrine_Export
      * @throws PDOException
      * @return void
      */
-    public function dropTable($table)
+    public function dropTableSql($table)
     {
         $table  = $this->conn->quoteIdentifier($table, true);
-        $this->conn->exec('DROP TABLE ' . $table);
+        return 'DROP TABLE ' . $table;
     }
 }
 
diff --git a/lib/Doctrine/Export/Oracle.php b/lib/Doctrine/Export/Oracle.php
index d66a91408..867d869a5 100644
--- a/lib/Doctrine/Export/Oracle.php
+++ b/lib/Doctrine/Export/Oracle.php
@@ -196,7 +196,7 @@ END;
     {
         $query = '';
         if (isset($definition['onDelete'])) {
-            $query .= ' ON DELETE ' . $definition['on_delete'];
+            $query .= ' ON DELETE ' . $definition['onDelete'];
         }
         if (isset($definition['deferrable'])) {
             $query .= ' DEFERRABLE';
@@ -420,15 +420,6 @@ END;
             $result = $this->conn->exec('ALTER TABLE ' . $name . ' RENAME TO ' . $changeName);
         }
     }
-    /** 
-     * getForeignKeyDeferredDeclaration
-     *
-     * @return string
-     */
-    public function getForeignKeyDeferredDeclaration($deferred)
-    {
-        return ($deferred) ? 'INITIALLY DEFERRED DEFERRABLE' : '';
-    }
     /**
      * create sequence
      *
diff --git a/lib/Doctrine/Export/Pgsql.php b/lib/Doctrine/Export/Pgsql.php
index 336f3bfe3..7d0f1f557 100644
--- a/lib/Doctrine/Export/Pgsql.php
+++ b/lib/Doctrine/Export/Pgsql.php
@@ -73,10 +73,10 @@ class Doctrine_Export_Pgsql extends Doctrine_Export
             $query .= ' MATCH ' . $definition['match'];
         }
         if (isset($definition['onUpdate'])) {
-            $query .= ' ON UPDATE ' . $definition['on_update'];
+            $query .= ' ON UPDATE ' . $definition['onUpdate'];
         }
         if (isset($definition['onDelete'])) {
-            $query .= ' ON DELETE ' . $definition['on_delete'];
+            $query .= ' ON DELETE ' . $definition['onDelete'];
         }
         if (isset($definition['deferrable'])) {
             $query .= ' DEFERRABLE';
diff --git a/lib/Doctrine/Export/Sqlite.php b/lib/Doctrine/Export/Sqlite.php
index 1a0f0e6f4..fb9b7b55b 100644
--- a/lib/Doctrine/Export/Sqlite.php
+++ b/lib/Doctrine/Export/Sqlite.php
@@ -249,10 +249,10 @@ class Doctrine_Export_Sqlite extends Doctrine_Export
             $query .= ' MATCH ' . $definition['match'];
         }
         if (isset($definition['onUpdate'])) {
-            $query .= ' ON UPDATE ' . $definition['on_update'];
+            $query .= ' ON UPDATE ' . $definition['onUpdate'];
         }
         if (isset($definition['onDelete'])) {
-            $query .= ' ON DELETE ' . $definition['on_delete'];
+            $query .= ' ON DELETE ' . $definition['onDelete'];
         }
         if (isset($definition['deferrable'])) {
             $query .= ' DEFERRABLE';
@@ -308,11 +308,11 @@ class Doctrine_Export_Sqlite extends Doctrine_Export
      * drop existing sequence
      *
      * @param string $sequenceName      name of the sequence to be dropped
-     * @return boolean
+     * @return string
      */
-    public function dropSequence($sequenceName)
+    public function dropSequenceSql($sequenceName)
     {
         $sequenceName = $this->conn->quoteIdentifier($this->conn->getSequenceName($sequenceName), true);
-        return $this->conn->exec('DROP TABLE ' . $sequenceName);
+        return 'DROP TABLE ' . $sequenceName;
     }
 }