Merge pull request #28 from pulasthibandara/patch-4

added DB2 specific SAVEPOINT grammar

src/Query/Grammars/DB2Grammar.php

@@ -198,4 +198,15 @@ class DB2Grammar extends Grammar
     {
         $this->dateFormat = $dateFormat;
     }
+
+    /**
+     * Compile the SQL statement to define a savepoint.
+     *
+     * @param  string  $name
+     * @return string
+     */
+    public function compileSavepoint($name)
+    {
+        return 'SAVEPOINT '.$name.' ON ROLLBACK RETAIN CURSORS';
+    }
 }