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/*
 * Copyright (c) 1998, 2018 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0,
 * or the Eclipse Distribution License v. 1.0 which is available at
 * http://www.eclipse.org/org/documents/edl-v10.php.
 *
 * SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
 */

// Contributors:
//     Oracle - initial API and implementation from Oracle TopLink
package org.eclipse.persistence.queries;

import org.eclipse.persistence.mappings.converters.Converter;

/**
 * 

Purpose: * Concrete class to perform a direct read. * *

Responsibilities: * Used in conjunction with DirectCollectionMapping. * This can be used to read a single column of data (i.e. one field). * A container (implementing Collection) of the data values is returned. * * @author Yvon Lavoie * @since TOPLink/Java 1.0 */ public class DirectReadQuery extends DataReadQuery { /** Allows user defined conversion between the result value and the database value. */ protected Converter valueConverter; /** * PUBLIC: * Initialize the state of the query. */ public DirectReadQuery() { super(); this.resultType = ATTRIBUTE; } /** * PUBLIC: * Initialize the query to use the specified SQL string. * Warning: Allowing an unverified SQL string to be passed into this * method makes your application vulnerable to SQL injection attacks. */ public DirectReadQuery(String sqlString) { super(sqlString); this.resultType = ATTRIBUTE; } /** * PUBLIC: * Initialize the query to use the specified call. */ public DirectReadQuery(Call call) { super(call); this.resultType = ATTRIBUTE; } /** * PUBLIC: * Return the converter on the query. * A converter can be used to convert between the result value and database value. */ public Converter getValueConverter() { return valueConverter; } /** * PUBLIC: * Set the converter on the query. * A converter can be used to convert between the result value and database value. */ public void setValueConverter(Converter valueConverter) { this.valueConverter = valueConverter; } /** * PUBLIC: * Return if this is a direct read query. */ public boolean isDirectReadQuery() { return true; } }





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