From 55a673218e7f54a3b6889523c2c3c1e25ca436f6 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E6=B8=A9=E5=B0=91?= <szujobs@hotmail.com>
Date: Tue, 8 May 2012 17:53:56 +0800
Subject: [PATCH] bug fixed

---
 .../com/alibaba/druid/mapping/spi/MappingVisitorUtils.java  | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/main/java/com/alibaba/druid/mapping/spi/MappingVisitorUtils.java b/src/main/java/com/alibaba/druid/mapping/spi/MappingVisitorUtils.java
index 26457e2c9d..61f6d9a6da 100644
--- a/src/main/java/com/alibaba/druid/mapping/spi/MappingVisitorUtils.java
+++ b/src/main/java/com/alibaba/druid/mapping/spi/MappingVisitorUtils.java
@@ -179,9 +179,11 @@ public class MappingVisitorUtils {
                 expr.putAttribute("mapping.varIndex", varIndex);
             }
             
-            Object parameter = visitor.getParameters().get(varIndex);
+            if (visitor.getParameters().size() > varIndex) {
+                Object parameter = visitor.getParameters().get(varIndex);
+                expr.putAttribute("mapping.value", parameter);
+            }
             
-            expr.putAttribute("mapping.value", parameter);
             return true;
         }