oracle.toplink.essentials.internal.expressions.SQLUpdateStatement Maven / Gradle / Ivy

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/*
 * The contents of this file are subject to the terms 
 * of the Common Development and Distribution License 
 * (the "License").  You may not use this file except 
 * in compliance with the License.
 * 
 * You can obtain a copy of the license at 
 * glassfish/bootstrap/legal/CDDLv1.0.txt or 
 * https://glassfish.dev.java.net/public/CDDLv1.0.html. 
 * See the License for the specific language governing 
 * permissions and limitations under the License.
 * 
 * When distributing Covered Code, include this CDDL 
 * HEADER in each file and include the License file at 
 * glassfish/bootstrap/legal/CDDLv1.0.txt.  If applicable, 
 * add the following below this CDDL HEADER, with the 
 * fields enclosed by brackets "[]" replaced with your 
 * own identifying information: Portions Copyright [yyyy] 
 * [name of copyright owner]
 */
// Copyright (c) 1998, 2007, Oracle. All rights reserved.  
package oracle.toplink.essentials.internal.expressions;

import java.io.*;
import java.util.*;
import oracle.toplink.essentials.exceptions.*;
import oracle.toplink.essentials.internal.helper.*;
import oracle.toplink.essentials.queryframework.*;
import oracle.toplink.essentials.internal.sessions.AbstractSession;

/**
 * Purpose: Print UPDATE statement.
 * 
Responsibilities:

 *  Print UPDATE statement.
 * 
 *    @author Dorin Sandu
 *    @since TOPLink/Java 1.0
 */
public class SQLUpdateStatement extends SQLModifyStatement {

    /**
     * Append the string containing the SQL insert string for the given table.
     */
    protected SQLCall buildCallWithoutReturning(AbstractSession session) {
        SQLCall call = new SQLCall();
        call.returnNothing();

        Writer writer = new CharArrayWriter(100);
        try {
            writer.write("UPDATE ");
            writer.write(getTable().getQualifiedName());
            writer.write(" SET ");

            Vector fieldsForTable = new Vector();
            for (Enumeration fieldsEnum = getModifyRow().keys(); fieldsEnum.hasMoreElements();) {
                DatabaseField field = (DatabaseField)fieldsEnum.nextElement();
                if (field.getTable().equals(getTable()) || (!field.hasTableName())) {
                    fieldsForTable.addElement(field);
                }
            }

            if (fieldsForTable.isEmpty()) {
                return null;
            }

            for (int i = 0; i < fieldsForTable.size(); i++) {
                DatabaseField field = (DatabaseField)fieldsForTable.elementAt(i);
                writer.write(field.getName());
                writer.write(" = ");
                call.appendModify(writer, field);

                if ((i + 1) < fieldsForTable.size()) {
                    writer.write(", ");
                }
            }

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

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