org.datanucleus.store.rdbms.query
Class SQLEvaluator

java.lang.Object
  org.datanucleus.store.rdbms.query.SQLEvaluator

public class SQLEvaluator
extends java.lang.Object

Evaluator for SQL-based queries. Takes the query, converts it into executable SQL and executes it, returning it in an appropriate form.

Field Summary

protected static org.datanucleus.util.Localiser

LOCALISER Localiser for messages.

Constructor Summary

SQLEvaluator(org.datanucleus.store.query.Query query, org.datanucleus.store.query.ResultObjectFactory rof, java.util.Collection candidateCollection)
Constructor.

Method Summary

java.lang.Object

evaluate(org.datanucleus.store.mapped.expression.QueryExpression queryStmt) Method to evaulate the query.

Methods inherited from class java.lang.Object

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

Field Detail

LOCALISER

protected static final org.datanucleus.util.Localiser LOCALISER

Localiser for messages.

Constructor Detail

SQLEvaluator

public SQLEvaluator(org.datanucleus.store.query.Query query,
                    org.datanucleus.store.query.ResultObjectFactory rof,
                    java.util.Collection candidateCollection)

Constructor.

Parameters:

query - The query

rof - Factory for results

candidateCollection - Candidate collection (optional)

Method Detail

evaluate

public java.lang.Object evaluate(org.datanucleus.store.mapped.expression.QueryExpression queryStmt)

Method to evaulate the query.

Parameters:

queryStmt - The query statement.

Returns:

Result of the query