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Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file to you 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, 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.apache.storm.jdbc.mapper;
public interface JdbcLookupMapper extends JdbcMapper {

Converts a DB row to a list of storm values that can be emitted. This is done to allow a single storm input tuple and a single DB row to result in multiple output values.

input the input tuple.
columns list of columns that represents a row
a List of storm values that can be emitted. Each item in list is emitted as an output tuple.
    public List<ValuestoTuple(ITuple inputList<Columncolumns);

declare what are the fields that this code will output.

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