org.intermine.sql.precompute
Class BestQueryExplainer.Candidate

java.lang.Object
  org.intermine.sql.precompute.BestQueryExplainer.Candidate

Enclosing class:

BestQueryExplainer

protected class BestQueryExplainer.Candidate
extends java.lang.Object

A class representing a candidate optimised query.

Field Summary

protected ExplainResult	explainResult
protected Query	query
protected java.lang.String	queryString
protected int	tableCount

Constructor Summary

BestQueryExplainer.Candidate(Query query)
Constructor.

BestQueryExplainer.Candidate(java.lang.String queryString)
Constructor.

Method Summary

boolean	betterThan(BestQueryExplainer.Candidate c) Returns true if the argument is slower than this, or if the argument is null.
ExplainResult	getExplain() Returns the ExplainResult of this Candidate, fetching the data if not already present.
Query	getQuery() Returns the Query of this Candidate, converting from a String if necessary.
java.lang.String	getQueryString() Returns the String query of this Candidate, converting from Query if necessary.
int	getTableCount() Returns the number of tables in this query.
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

queryString

protected java.lang.String queryString

query

protected Query query

explainResult

protected ExplainResult explainResult

tableCount

protected int tableCount

Constructor Detail

BestQueryExplainer.Candidate

public BestQueryExplainer.Candidate(java.lang.String queryString)

Constructor.

Parameters:

queryString - an SQL query String

BestQueryExplainer.Candidate

public BestQueryExplainer.Candidate(Query query)

Constructor.

Parameters:

query - a Query

Method Detail

getTableCount

public int getTableCount()

Returns the number of tables in this query.

Returns:

an int

getQueryString

public java.lang.String getQueryString()

Returns the String query of this Candidate, converting from Query if necessary.

Returns:

a String

getQuery

public Query getQuery()

Returns the Query of this Candidate, converting from a String if necessary.

Returns:

a Query

getExplain

public ExplainResult getExplain()
                         throws java.sql.SQLException

Returns the ExplainResult of this Candidate, fetching the data if not already present.

Returns:

an ExplainResult

Throws:

java.sql.SQLException - if an error occurs in the underlying database

betterThan

public boolean betterThan(BestQueryExplainer.Candidate c)
                   throws java.sql.SQLException

Returns true if the argument is slower than this, or if the argument is null.

Parameters:

c - a Candidate

Returns:

a boolean

Throws:

java.sql.SQLException - if an error occurs in the underlying database

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object