修正Clob和NClob的问题

git-svn-id: http://code.alibabatech.com/svn/druid/trunk@60 b9813039-fb51-4c41-a8b9-e21c2acb5095

src/main/java/com/alibaba/druid/proxy/jdbc/NClobProxyImpl.java

@@ -0,0 +1,25 @@
+package com.alibaba.druid.proxy.jdbc;
+
+import java.sql.NClob;
+
+import com.alibaba.druid.filter.FilterChain;
+import com.alibaba.druid.filter.FilterChainImpl;
+
+public class NClobProxyImpl extends ClobProxyImpl implements NClobProxy {
+
+    private final NClob nclob;
+
+    public NClobProxyImpl(DataSourceProxy dataSource, ConnectionProxy connection, NClob clob){
+        super(dataSource, connection, clob);
+        this.nclob = clob;
+    }
+
+    public FilterChain createChain() {
+        return new FilterChainImpl(dataSource);
+    }
+
+    @Override
+    public NClob getRawNClob() {
+        return nclob;
+    }
+}