Added support for foreign keys

lib/Doctrine/DBAL/Platforms/DrizzlePlatform.php

@@ -154,7 +154,15 @@ class DrizzlePlatform extends AbstractPlatform
 
     public function getListTableForeignKeysSQL($table, $database = null)
     {
-        return "SELECT * FROM DATA_DICTIONARY.FOREIGN_KEYS";
+        if ($database) {
+            $database = "'" . $database . "'";
+        } else {
+            $database = 'DATABASE()';
+        }
+
+        return "SELECT CONSTRAINT_NAME, CONSTRAINT_COLUMNS, REFERENCED_TABLE_NAME, REFERENCED_TABLE_COLUMNS, UPDATE_RULE, DELETE_RULE" .
+               " FROM DATA_DICTIONARY.FOREIGN_KEYS" .
+               " WHERE CONSTRAINT_SCHEMA=" . $database . " AND CONSTRAINT_TABLE='" . $table . "'";
     }
 
     public function getListTableIndexesSQL($table, $database = null)

lib/Doctrine/DBAL/Schema/DrizzleSchemaManager.php

@@ -50,5 +50,32 @@ class DrizzleSchemaManager extends AbstractSchemaManager
     {
         return $table['TABLE_NAME'];
     }
+
+    public function _getPortableTableForeignKeyDefinition($tableForeignKey)
+    {
+        $columns = array();
+        foreach (explode(',', $tableForeignKey['CONSTRAINT_COLUMNS']) as $value)
+        {
+            $columns[] = trim($value, '`');
+        }
+
+        $ref_columns = array();
+        foreach (explode(',', $tableForeignKey['REFERENCED_TABLE_COLUMNS']) as $value)
+        {
+            $ref_columns[] = trim($value, '`');
+        }
+
+        return new ForeignKeyConstraint(
+            $columns,
+            $tableForeignKey['REFERENCED_TABLE_NAME'],
+            $ref_columns,
+            $tableForeignKey['CONSTRAINT_NAME'].
+            array(
+                'onUpdate' => $tableForeignKey['UPDATE_RULE'],
+                'onDelete' => $tableForeignKey['DELETE_RULE'],
+            )
+        );
+
+    }
 }