增强监控

git-svn-id: http://code.alibabatech.com/svn/druid/trunk@933 b9813039-fb51-4c41-a8b9-e21c2acb5095

src/main/java/com/alibaba/druid/pool/PreparedStatementPool.java

@@ -47,7 +47,6 @@ public class PreparedStatementPool {
 
         if (holder != null) {
             holder.incrementReusedCount();
-            dataSource.decrementCachedPreparedStatementCount();
         }
 
         return holder;
@@ -59,7 +58,9 @@ public class PreparedStatementPool {
         if (oldHolder != null) {
             dataSource.closePreapredStatement(oldHolder);
         } else {
-            dataSource.incrementCachedPreparedStatementCount();
+            if (holder.getReusedCount() == 0) {
+                dataSource.incrementCachedPreparedStatementCount();
+            }
         }
     }