http://jdbi.org/: jdbi is designed to provide convenient tabular data access in Java(tm). It uses the Java collections framework for query results, provides a convenient means of externalizing sql statements, and provides named parameter support for any database being used. 
/*
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.jdbi.v3.core.mapper;

import java.lang.annotation.Retention;
import java.lang.annotation.Target;

import static java.lang.annotation.ElementType.FIELD;
import static java.lang.annotation.ElementType.METHOD;
import static java.lang.annotation.ElementType.PARAMETER;
import static java.lang.annotation.RetentionPolicy.RUNTIME;


Signals that the annotated element is a nested mapped type.

/**
 * Signals that the annotated element is a nested mapped type.
 */
@Retention(RUNTIME)
@Target({PARAMETER, FIELD, METHOD})
public @interface Nested {
  
The column name prefix for all members of the nested object. If unset,
no column name prefix is applied.

Returns:the column name prefix
/**
   * The column name prefix for all members of the nested object. If unset,
   * no column name prefix is applied.
   * @return the column name prefix
   */
  String value() default "";
}