SqlPreprocessor: escapes primary value of IRow [Closes #144]

Author: dg

src/Database/SqlPreprocessor.php

@@ -135,7 +135,7 @@ private function formatValue($value, $mode = NULL)
 				return 'NULL';
 
 			} elseif ($value instanceof Table\IRow) {
-				return $value->getPrimary();
+				return $this->formatValue($value->getPrimary());
 
 			} elseif ($value instanceof SqlLiteral) {
 				$prep = clone $this;