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.
  • Brian McCallister
  • Martin Traverso
  • Henning Schmiedehausen
  • Adam Rosien
  • Thomas Dudziak
  • Steven Schlansker 
/*
 * 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.skife.jdbi.v2;

import java.sql.ResultSet;
import java.sql.SQLException;

/**
 *
 */
public interface Folder2<AccumulatorType>
{
    
Invoked once per row in the result set from the query.

Params:
  • accumulator – The initial value passed to Query.fold(Object, Folder) for the first call, the return value from the previous call thereafter.
  • rs – The actual result set from the query. It will already have been advanced to the correct row. Callbacks should not call ResultSet.next()
  • ctx – The statement context for execution
Throws:
Returns:A value which will be passed to the next invocation of this function. The final invocation will be returned from the Query.fold(Object, Folder) call.
/**
     * Invoked once per row in the result set from the query.
     *
     * @param accumulator The initial value passed to {@link org.skife.jdbi.v2.Query#fold(Object, Folder)}
     *                    for the first call, the return value from the previous call thereafter.
     * @param rs The actual result set from the query. It will already have been advanced to the
     *           correct row. Callbacks should not call {@link java.sql.ResultSet#next()}
     * @param ctx The statement context for execution
     * @return A value which will be passed to the next invocation of this function. The final
     *         invocation will be returned from the {@link org.skife.jdbi.v2.Query#fold(Object, Folder)} call.
     * @throws java.sql.SQLException will be wrapped and rethrown as a {@link org.skife.jdbi.v2.exceptions.CallbackFailedException}
     */
    AccumulatorType fold(AccumulatorType accumulator, ResultSet rs, StatementContext ctx) throws SQLException;

}