org.apache.storm.jdbc.mapper

Interface JdbcLookupMapper

All Superinterfaces:

JdbcMapper, Serializable

All Known Implementing Classes:

SimpleJdbcLookupMapper

public interface JdbcLookupMapper
extends JdbcMapper

Method Summary

Modifier and Type	Method and Description
void	declareOutputFields(OutputFieldsDeclarer declarer) declare what are the fields that this code will output.
List<Values>	toTuple(ITuple input, List<Column> columns) Converts a DB row to a list of storm values that can be emitted.

Methods inherited from interface org.apache.storm.jdbc.mapper.JdbcMapper

getColumns

Method Detail

toTuple

List<Values> toTuple(ITuple input,
                     List<Column> columns)

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.

Parameters:

input - the input tuple.

columns - list of columns that represents a row

Returns:

a List of storm values that can be emitted. Each item in list is emitted as an output tuple.

declareOutputFields

void declareOutputFields(OutputFieldsDeclarer declarer)

declare what are the fields that this code will output.