foundation/org.eclipse.persistence.core/src/main/java/org/eclipse/persistence/internal/expressions/SQLDeleteStatement.java

/*
 * Copyright (c) 1998, 2020 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.internal.expressions;

import java.io.*;
import org.eclipse.persistence.exceptions.*;
import org.eclipse.persistence.queries.*;
import org.eclipse.persistence.internal.databaseaccess.DatabaseCall;
import org.eclipse.persistence.internal.sessions.AbstractSession;

/**
 * <p><b>Purpose</b>: Print DELETE statement.
 * <p><b>Responsibilities</b>:<ul>
 * <li> Print DELETE statement.
 * </ul>
 * @author Dorin Sandu
 * @since TOPLink/Java 1.0
 */
public class SQLDeleteStatement extends SQLModifyStatement {

    /**
     * Append the string containing the SQL insert string for the given table.
     */
    @Override
    public DatabaseCall buildCall(AbstractSession session) {
        SQLCall call = new SQLCall();
        call.returnNothing();

        Writer writer = new CharArrayWriter(100);
        try {
            writer.write("DELETE ");

            if (getHintString() != null) {
                writer.write(getHintString());
                writer.write(" ");
            }
            writer.write("FROM ");
            writer.write(getTable().getQualifiedNameDelimited(session.getPlatform()));

            if (getWhereClause() != null) {
                writer.write(" WHERE ");
                ExpressionSQLPrinter printer = new ExpressionSQLPrinter(session, getTranslationRow(), call, false, getBuilder());
                printer.setWriter(writer);
                printer.printExpression(getWhereClause());
            }

            call.setSQLString(writer.toString());
        } catch (IOException exception) {
            throw ValidationException.fileError(exception);
        }
        return call;
    }
}