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org.apache.derby.impl.sql.compile
Class CountAggregateDefinition  

java.lang.Object
  org.apache.derby.impl.sql.compile.CountAggregateDefinition

All Implemented Interfaces:

AggregateDefinition

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public class CountAggregateDefinition

extends java.lang.Object

implements AggregateDefinition

Defintion for the COUNT()/COUNT(*) aggregates.

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Constructor Summary

CountAggregateDefinition()           Niladic constructor.

 

Method Summary
org.apache.derby.catalog.TypeDescriptor	getAggregator(org.apache.derby.catalog.TypeDescriptor inputType, java.lang.StringBuffer aggregatorClass)           Determines the result datatype.

 

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

 

Constructor Detail

CountAggregateDefinition

public CountAggregateDefinition()

Niladic constructor. Does nothing. For ease Of use, only.

Method Detail

getAggregator

public final org.apache.derby.catalog.TypeDescriptor getAggregator(org.apache.derby.catalog.TypeDescriptor inputType,
                                                                   java.lang.StringBuffer aggregatorClass)

Determines the result datatype. We can run count() on anything, and it always returns a INTEGER (java.lang.Integer).

Specified by:

getAggregator in interface AggregateDefinition

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Overview  Package   Class  Use  Deprecated  Index
Home >> All >> org >> apache >> derby >> impl >> sql >> [ compile overview ]	PREV CLASS  NEXT CLASS
SUMMARY:  JAVADOC |  SOURCE |  DOWNLOAD | NESTED | FIELD | CONSTR | METHOD	DETAIL: FIELD | CONSTR | METHOD

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