JdbcLookupMapper (Storm 2.7.1 API)

All Superinterfaces:

JdbcMapper, Serializable

All Known Implementing Classes:

SimpleJdbcLookupMapper
```
public interface JdbcLookupMapper
extends JdbcMapper
```

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	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.