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  * Copyright 2004 - 2011 Brian McCallister
  * 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
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.
package org.skife.jdbi.v2;
Used to define a function for folding over the result set of a query.

Prefer Folder2, in jdbi3 Folder2 will be renamed Folder and this form will go away
See also:
public interface Folder<AccumulatorType>
Invoked once per row in the result set from the query.

accumulator The initial value passed to Query.fold(java.lang.Object,org.skife.jdbi.v2.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
A value which will be passed to the next invocation of this function. The final invocation will be returned from the Query.fold(java.lang.Object,org.skife.jdbi.v2.Folder) call.
java.sql.SQLException will be wrapped and rethrown as a org.skife.jdbi.v2.exceptions.CallbackFailedException
    AccumulatorType fold(AccumulatorType accumulatorResultSet rsthrows SQLException;
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