修正cache preparedStatement的问题

git-svn-id: http://code.alibabatech.com/svn/druid/trunk@929 b9813039-fb51-4c41-a8b9-e21c2acb5095

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

@@ -172,6 +172,10 @@ public class DruidDataSource extends DruidAbstractDataSource implements DruidDat
                 for (int i = 0; i < poolingCount; ++i) {
                     ConnectionHolder connection = connections[i];
 
+                    for (PreparedStatementHolder holder : connection.getStatementPool().getMap().values()) {
+                        JdbcUtils.close(holder.getStatement());
+                    }
+                    
                     connection.getStatementPool().getMap().clear();
                 }
             }