--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/jdk.incubator.adba/share/classes/jdk/incubator/sql2/SqlRef.java	Mon Apr 02 14:19:45 2018 -0400
@@ -0,0 +1,82 @@
+/*
+ * Copyright (c)  2017, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ * 
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ * 
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ * 
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ * 
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+package jdk.incubator.sql2;
+
+import java.util.concurrent.CompletionStage;
+
+/**
+ *
+ * @param <T>
+ */
+public interface SqlRef<T> {
+  
+  /**
+   * Return the name of SQL type of the referent of this SQL REF.
+   * 
+   * ISSUE: Oracle Database JDBC driver may do a round trip for this. Is this
+   * that heavy in other databases?
+   * 
+   * @return
+   */
+  public String getReferentTypeName();
+  
+  /**
+   * Create and return an Operation that will fetch the value of the REF from
+   * the database. The value of the Operation is the value of the REF.
+   *
+   * @return an Operation that will fetch the referent of this SqlRef
+   */
+  public Operation<T> fetchOperation();
+  
+  /**
+   * Submit an Operation that will fetch the value of the REF in the database.
+   *
+   * @return a Future that will complete when the submitted Operation completes.
+   * The value of the Future is the value of the REF.
+   */
+  public default CompletionStage<T> fetch() {
+    return fetchOperation().submit().getCompletionStage();
+  }
+  
+  /**
+   * Create and return an Operation that will set the value of the REF in the
+   * database.
+   *
+   * @param value
+   * @return an Operation that will store the new referent into the REF
+   */
+  public Operation<Void> storeOperation(T value);
+  
+  /**
+   * Submit an Operation that will store the new value of the referent into
+   * the REF in the database.
+   *
+   * @param value
+   * @return a Future that will complete when the submitted Operation completes.
+   */
+  public default CompletionStage<Void> store(T value) {
+    return storeOperation(value).submit().getCompletionStage();
+  }
+}