HSQLDB example source code file (Transaction.java)

This example HSQLDB source code file (Transaction.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - HSQLDB tags/keywords

exception, exception, row, row, scn, scn, table, table, transaction

The HSQLDB Transaction.java source code

/*
 * For work developed by the HSQL Development Group:
 *
 * Copyright (c) 2001-2010, The HSQL Development Group
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * Neither the name of the HSQL Development Group nor the names of its
 * contributors may be used to endorse or promote products derived from this
 * software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL HSQL DEVELOPMENT GROUP, HSQLDB.ORG,
 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *
 *
 * For work originally developed by the Hypersonic SQL Group:
 *
 * Copyright (c) 1995-2000, The Hypersonic SQL Group.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * Neither the name of the Hypersonic SQL Group nor the names of its
 * contributors may be used to endorse or promote products derived from this
 * software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE HYPERSONIC SQL GROUP,
 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * This software consists of voluntary contributions made by many individuals
 * on behalf of the Hypersonic SQL Group.
 */


package org.hsqldb;

/**
 * Represents a single row table operation.
 *
 * @author Thomas Mueller (Hypersonic SQL Group)
 * @version 1.8.0
 * @since Hypersonic SQL
 */
class Transaction {

    boolean isDelete;
    Table   tTable;
    Row     row;
    long    SCN;

    /**
     * Constructor. <p>
     *
     * @param delete if true, this represents a single row delete action, else
     *      a single row insert action
     * @param nested true if this action is part of a transaction initiated
     *  within an INSERT INTO or UPDATE statement
     * @param table the Table object against which the operation occured
     * @param row the row data that iis inserted or deleted
     */
    Transaction(boolean delete, Table table, Row row, long SCN) {

        isDelete = delete;
        tTable   = table;
        this.row = row;
    }

    /**
     * Undoes the single row delete or insert represented by this object.
     *
     * @param session the session context in which to perform the undo
     * @param log if true log the work
     * @throws HsqlException if a database access error occurs
     */
    void rollback(Session session, boolean log) {

        try {
            if (isDelete) {
                tTable.insertNoCheckRollback(session, row, log);
            } else {
                tTable.deleteNoCheckRollback(session, row, log);
            }
        } catch (Exception e) {

//            System.out.println("rollback error: isDelete " + isDelete);
        }
    }

    void commit(Session session) {

        try {
            if (isDelete) {
                tTable.removeRowFromStore(row);
            } else {
                tTable.commitRowToStore(row);
            }
        } catch (Exception e) {

//            System.out.println("rollback error: isDelete " + isDelete);
        }
    }

    void logRollback(Session session) {

        try {
            if (isDelete) {
                tTable.database.logger.writeInsertStatement(session, tTable,
                        row.getData());
            } else {
                tTable.database.logger.writeDeleteStatement(session, tTable,
                        row.getData());
            }
        } catch (Exception e) {}
    }

    void logAction(Session session) {

        try {
            if (isDelete) {
                tTable.database.logger.writeDeleteStatement(session, tTable,
                        row.getData());
            } else {
                tTable.database.logger.writeInsertStatement(session, tTable,
                        row.getData());
            }
        } catch (Exception e) {}
    }
}