Class SailConnectionQuery
- java.lang.Object
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- org.eclipse.rdf4j.query.impl.AbstractOperation
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- org.eclipse.rdf4j.query.impl.AbstractQuery
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- org.eclipse.rdf4j.query.impl.AbstractParserQuery
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- org.eclipse.rdf4j.sail.SailConnectionQuery
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- Direct Known Subclasses:
SailConnectionBooleanQuery
,SailConnectionGraphQuery
,SailConnectionTupleQuery
public abstract class SailConnectionQuery extends AbstractParserQuery
- Author:
- Arjohn Kampman
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Nested Class Summary
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Nested classes/interfaces inherited from class org.eclipse.rdf4j.query.impl.AbstractParserQuery
AbstractParserQuery.QueryInterruptIteration
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Nested classes/interfaces inherited from interface org.eclipse.rdf4j.query.Query
Query.QueryType
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Field Summary
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Fields inherited from class org.eclipse.rdf4j.query.impl.AbstractParserQuery
DEFAULT_EXPLANATION_EXECUTION_TIMEOUT
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Fields inherited from class org.eclipse.rdf4j.query.impl.AbstractOperation
bindings, dataset, includeInferred
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Constructor Summary
Constructors Modifier Constructor Description protected
SailConnectionQuery(ParsedQuery parsedQuery, SailConnection con)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description Explanation
explain(Explanation.Level level)
Explain how the query will be (or has been) executed/evaluated by returning an explanation of the query plan.protected SailConnection
getSailConnection()
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Methods inherited from class org.eclipse.rdf4j.query.impl.AbstractParserQuery
enforceMaxQueryTime, getActiveDataset, getParsedQuery, toString
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Methods inherited from class org.eclipse.rdf4j.query.impl.AbstractQuery
getMaxQueryTime, setMaxQueryTime
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Methods inherited from class org.eclipse.rdf4j.query.impl.AbstractOperation
clearBindings, getBindings, getDataset, getIncludeInferred, getMaxExecutionTime, removeBinding, setBinding, setDataset, setIncludeInferred, setMaxExecutionTime
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Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
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Methods inherited from interface org.eclipse.rdf4j.query.Operation
clearBindings, getBindings, getDataset, getIncludeInferred, getMaxExecutionTime, removeBinding, setBinding, setDataset, setIncludeInferred, setMaxExecutionTime
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Constructor Detail
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SailConnectionQuery
protected SailConnectionQuery(ParsedQuery parsedQuery, SailConnection con)
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Method Detail
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getSailConnection
protected SailConnection getSailConnection()
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explain
public Explanation explain(Explanation.Level level)
Description copied from interface:Query
Explain how the query will be (or has been) executed/evaluated by returning an explanation of the query plan.
This method is useful for understanding why a particular query is slow. The most useful level is Executed, but this takes as long as it takes to execute/evaluate the query.
When timing a query you should keep in mind that the query performance will vary based on how much the JIT compiler has compiled the code (C1 vs C2) and based on what is or isn't cached in memory. If Timed explanations are considerably slower than Executed explanations the overhead with timing the query may be large on your system and should not be trusted.
WARNING: This method is experimental and is subject to change or removal without warning. Same goes for the returned explanation. There is currently only partial support for this method in RDF4J and and UnsupportedOperationException where support is lacking.
- Parameters:
level
- The explanation level that should be used to create the explanation. Choose between: Unoptimized (as parsed without optimizations) , Optimized (as is actually going to be used), Executed (as was executed/evaluated, including some real performance metrics), Timed (as was executed/evaluated including all real performance metrics). Executed and Timed level can potentially be slow.- Returns:
- The explanation that we generated, which can be viewed in a human readable format with toString(), as JSON or as a simplified query plan object structure.
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