Package com.arcadedb.query.sql.executor

Class CountFromClassStep

java.lang.Object

com.arcadedb.query.sql.executor.AbstractExecutionStep

com.arcadedb.query.sql.executor.CountFromClassStep

All Implemented Interfaces:

ExecutionStep, ExecutionStepInternal

public class CountFromClassStep
extends AbstractExecutionStep

Returns the number of records contained in a class (including subTypes) Executes a count(*) on a class and returns a single record that contains that value (with a specific alias).

Author:

Luigi Dell'Aquila (luigi.dellaquila - at - gmail.com)

Field Summary

Fields inherited from class com.arcadedb.query.sql.executor.AbstractExecutionStep

ctx, next, prev, profilingEnabled, timedOut

Constructor Summary

Constructors

Constructor	Description
CountFromClassStep(Identifier targetClass, String alias, CommandContext ctx, boolean profilingEnabled)

Method Summary

Modifier and Type	Method	Description
long	getCost()	returns the absolute cost (in nanoseconds) of the execution of this step
String	prettyPrint(int depth, int indent)
void	reset()
ResultSet	syncPull(CommandContext ctx, int nRecords)

Methods inherited from class com.arcadedb.query.sql.executor.AbstractExecutionStep

close, getContext, getCostFormatted, getNext, getPrev, isProfilingEnabled, isTimedOut, sendTimeout, setNext, setPrevious, setProfilingEnabled

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.arcadedb.query.sql.executor.ExecutionStep

toResult

Methods inherited from interface com.arcadedb.query.sql.executor.ExecutionStepInternal

canBeCached, copy, deserialize, getDescription, getName, getSubExecutionPlans, getSubSteps, getTargetNode, getType, serialize

Constructor Detail

CountFromClassStep

public CountFromClassStep(Identifier targetClass,
                          String alias,
                          CommandContext ctx,
                          boolean profilingEnabled)

Parameters:

targetClass - An identifier containing the name of the class to count

alias - the name of the property returned in the result-set

ctx - the query context

profilingEnabled - true to enable the profiling of the execution (for SQL PROFILE)

Method Detail

syncPull

public ResultSet syncPull(CommandContext ctx,
                          int nRecords)
                   throws TimeoutException

Throws:

TimeoutException

reset

public void reset()

prettyPrint

public String prettyPrint(int depth,
                          int indent)

getCost

public long getCost()

Description copied from interface: ExecutionStep

returns the absolute cost (in nanoseconds) of the execution of this step

Returns:

the absolute cost (in nanoseconds) of the execution of this step, -1 if not calculated