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## org.apache.openjpa.jdbc.kernel.exps
Interface JDBCAggregateListener

All Superinterfaces:
  AggregateListener, Serializable

    public interface JDBCAggregateListener

extends AggregateListener

JDBC extension to the `AggregateListener`.

Author:
  Abe White

Method Summary
`void` | `appendTo(SQLBuffer buf, FilterValue[] args, ClassMapping mapping, JDBCStore store)` Append the SQL for this aggregate.

Methods inherited from interface org.apache.openjpa.kernel.exps.AggregateListener
`evaluate, expectsArguments, getTag, getType`

Method Detail

### appendTo

    void appendTo(SQLBuffer buf,
                  FilterValue[] args,
                  ClassMapping mapping,
                  JDBCStore store)

  Append the SQL for this aggregate.

  Parameters:
    `buf` - the SQL buffer to append to
    `args` - the values of the arguments given in the filter, or null if this listener doesn't expect arguments
    `mapping` - the class mapping for the query's candidate class
    `store` - the store that owns the query

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