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Java Source Code / Java Documentation » Database DBMS » db derby 10.2 » org.apache.derby.impl.sql.execute   Source Cross Reference   Class Diagram   Java Document (Java Doc)   java.lang.Object    org.apache.derby.impl.sql.execute.SystemAggregator       org.apache.derby.impl.sql.execute.CountAggregator CountAggregator final public class CountAggregator extends SystemAggregator (Code) Aggregator for COUNT()/COUNT(*). author:    jamie Method Summary public  void accumulate(DataValueDescriptor addend, Object ga)      Accumulate for count(). final protected  void accumulate(DataValueDescriptor addend)      public  DataValueDescriptor getResult()      Return the result of the aggregation. public  int getTypeFormatId()      Get the formatID which corresponds to this class. public  boolean isCountStar()      public  void merge(ExecAggregator addend)      public  ExecAggregator newAggregator()      final public  void readExternal(ObjectInput in)      public  void setup(String aggregateName)      final public  void writeExternal(ObjectOutput out)      Although we are not expected to be persistent per se, we may be written out by the sorter temporarily. Method Detail accumulate public void accumulate(DataValueDescriptor addend, Object ga) throws StandardException(Code) Accumulate for count(). Toss out all nulls in this kind of count. Increment the count for count(*). Count even the null values. Parameters:   addend - value to be added in Parameters:   ga - the generic aggregator that is calling me See Also:   ExecAggregator.accumulate accumulate final protected void accumulate(DataValueDescriptor addend)(Code) getResult public DataValueDescriptor getResult()(Code) Return the result of the aggregation. Just spit out the running count. the value as a Long getTypeFormatId public int getTypeFormatId()(Code) Get the formatID which corresponds to this class. the formatID of this class isCountStar public boolean isCountStar()(Code) merge public void merge(ExecAggregator addend) throws StandardException(Code) See Also:   ExecAggregator.merge exception:   StandardException - on error newAggregator public ExecAggregator newAggregator()(Code) ExecAggregator the new aggregator readExternal final public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException(Code) See Also:   java.io.Externalizable.readExternal See Also:    exception:   IOException - io exception exception:   ClassNotFoundException - on error setup public void setup(String aggregateName)(Code) writeExternal final public void writeExternal(ObjectOutput out) throws IOException(Code) Although we are not expected to be persistent per se, we may be written out by the sorter temporarily. So we need to be able to write ourselves out and read ourselves back in. exception:   IOException - thrown on error Methods inherited from org.apache.derby.impl.sql.execute.SystemAggregator public void accumulate(DataValueDescriptor addend, Object ga) throws StandardException(Code)(Java Doc) abstract protected void accumulate(DataValueDescriptor addend) throws StandardException(Code)(Java Doc) public boolean didEliminateNulls()(Code)(Java Doc) public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException(Code)(Java Doc) public void writeExternal(ObjectOutput out) throws IOException(Code)(Java Doc) Methods inherited from java.lang.Object native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc) public boolean equals(Object obj)(Code)(Java Doc) protected void finalize() throws Throwable(Code)(Java Doc) final native public Class getClass()(Code)(Java Doc) native public int hashCode()(Code)(Java Doc) final native public void notify()(Code)(Java Doc) final native public void notifyAll()(Code)(Java Doc) public String toString()(Code)(Java Doc) final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc) final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc) final public void wait() throws InterruptedException(Code)(Java Doc)