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HSQLDB example source code file (TransferTable.java)

This example HSQLDB source code file (TransferTable.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

dataaccesspoint, destination, exception, exception, executing, executing, ignoring, io, jdbc, sql, sqlstatements, statement, statement, string, string, table, traceable, util

The HSQLDB TransferTable.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.util;

import java.io.Serializable;
import java.sql.SQLException;
import java.util.Hashtable;

// fredt@users 20011220 - patch 481239 by xponsard@users - enhancements
// enhancements to support saving and loading of transfer settings,
// transfer of blobs, and catalog and schema names in source db
// changes by fredt to allow saving and loading of transfer settings
// fredt@users 20020215 - patch 516309 by Nicolas Bazin - enhancements
// sqlbob@users 20020325 - patch 1.7.0 - reengineering
// fredt@users 20040508 - patch 1.7.2 - bug fixes

/**
 * Transfers data from one database to another
 *
 * @author Thomas Mueller (Hypersonic SQL Group)
 * @version 1.7.2
 * @since Hypersonic SQL
 */
class TransferTable implements Serializable {

    Hashtable       hTypes;
    DataAccessPoint sourceDb;
    DataAccessPoint destDb;
    SQLStatements   Stmts = null;
    Traceable       tracer;

    TransferTable(DataAccessPoint src, String name, String schema,
                  String type, Traceable t) {

        Stmts         = new SQLStatements();
        sourceDb      = src;
        Stmts.sSchema = "";

        if (schema != null && schema.length() > 0) {
            Stmts.sSchema = schema;
        }

        Stmts.sType              = type;
        Stmts.sDatabaseToConvert = src.databaseToConvert;
        Stmts.sSourceTable       = Stmts.sDestTable = name;
        tracer                   = t;

        if (Stmts.sType.compareTo("TABLE") == 0) {
            Stmts.sSourceSelect = "SELECT * FROM "
                                  + src.helper.formatName(Stmts.sSourceTable);
        } else if (Stmts.sType.compareTo("VIEW") == 0) {
            Stmts.sSourceSelect = "";
        }
    }

    void setDest(String _Schema, DataAccessPoint dest) throws Exception {

        destDb = dest;

        dest.helper.setSchema(_Schema);
    }

    /**
     * extractTableStructure
     *
     * @param Source
     * @param Destination
     * @throws Exception
     */
    void extractTableStructure(DataAccessPoint Source,
                               DataAccessPoint Destination) throws Exception {
        initTypes();
        Source.getTableStructure(this, Destination);
    }

    /**
     * @throws SQLException
     */
    void transferStructure() throws Exception {

        String Statement = new String("");

        if (destDb.helper.needTransferTransaction()) {
            try {
                destDb.setAutoCommit(false);
            } catch (Exception e) {}
        }

        if (Stmts.bTransfer == false) {
            tracer.trace("Table " + Stmts.sSourceTable + " not transfered");

            return;
        }

        tracer.trace("Table " + Stmts.sSourceTable + ": start transfer");

        try {
            if (Stmts.bDropIndex) {
                if (Stmts.sDestDropIndex.charAt(Stmts.sDestDropIndex.length()
                                                - 1) != ';') {
                    Stmts.sDestDropIndex += ";";
                }

                int lastsemicolon = 0;
                int nextsemicolon = Stmts.sDestDropIndex.indexOf(';');

                while (nextsemicolon > lastsemicolon) {
                    Statement = Stmts.sDestDropIndex.substring(lastsemicolon,
                            nextsemicolon);

                    while (Statement.charAt(Statement.length() - 1) == ';') {
                        Statement = Statement.substring(0, Statement.length()
                                                        - 1);
                    }

                    try {
                        tracer.trace("Executing " + Statement);
                        destDb.execute(Statement);
                    } catch (Exception e) {
                        tracer.trace("Ignoring error " + e.getMessage());
                    }

                    lastsemicolon = nextsemicolon + 1;
                    nextsemicolon = lastsemicolon
                                    + Stmts.sDestDropIndex.substring(
                                        lastsemicolon).indexOf(';');
                }
            }

            if (Stmts.bDelete) {
                if (Stmts.sDestDelete.charAt(Stmts.sDestDelete.length() - 1)
                        != ';') {
                    Stmts.sDestDelete += ";";
                }

                int lastsemicolon = 0;
                int nextsemicolon = Stmts.sDestDelete.indexOf(';');

                while (nextsemicolon > lastsemicolon) {
                    Statement = Stmts.sDestDelete.substring(lastsemicolon,
                            nextsemicolon);

                    while (Statement.charAt(Statement.length() - 1) == ';') {
                        Statement = Statement.substring(0, Statement.length()
                                                        - 1);
                    }

                    try {
                        tracer.trace("Executing " + Statement);
                        destDb.execute(Statement);
                    } catch (Exception e) {
                        tracer.trace("Ignoring error " + e.getMessage());
                    }

                    lastsemicolon = nextsemicolon + 1;
                    nextsemicolon = lastsemicolon
                                    + Stmts.sDestDelete.substring(
                                        lastsemicolon).indexOf(';');
                }
            }

            if (Stmts.bDrop) {
                if (Stmts.sDestDrop.charAt(Stmts.sDestDrop.length() - 1)
                        != ';') {
                    Stmts.sDestDrop += ";";
                }

                int lastsemicolon = 0;
                int nextsemicolon = Stmts.sDestDrop.indexOf(';');

                while (nextsemicolon > lastsemicolon) {
                    Statement = Stmts.sDestDrop.substring(lastsemicolon,
                                                          nextsemicolon);

                    while (Statement.charAt(Statement.length() - 1) == ';') {
                        Statement = Statement.substring(0, Statement.length()
                                                        - 1);
                    }

                    try {
                        tracer.trace("Executing " + Statement);
                        destDb.execute(Statement);
                    } catch (Exception e) {
                        tracer.trace("Ignoring error " + e.getMessage());
                    }

                    lastsemicolon = nextsemicolon + 1;
                    nextsemicolon = lastsemicolon
                                    + Stmts.sDestDrop.substring(
                                        lastsemicolon).indexOf(';');
                }
            }

            if (Stmts.bCreate) {
                if (Stmts.sDestCreate.charAt(Stmts.sDestCreate.length() - 1)
                        != ';') {
                    Stmts.sDestCreate += ";";
                }

                int lastsemicolon = 0;
                int nextsemicolon = Stmts.sDestCreate.indexOf(';');

                while (nextsemicolon > lastsemicolon) {
                    Statement = Stmts.sDestCreate.substring(lastsemicolon,
                            nextsemicolon);

                    while (Statement.charAt(Statement.length() - 1) == ';') {
                        Statement = Statement.substring(0, Statement.length()
                                                        - 1);
                    }

                    tracer.trace("Executing " + Statement);
                    destDb.execute(Statement);

                    lastsemicolon = nextsemicolon + 1;
                    nextsemicolon = lastsemicolon
                                    + Stmts.sDestCreate.substring(
                                        lastsemicolon).indexOf(';');
                }
            }
        } catch (Exception e) {
            try {
                if (!destDb.getAutoCommit()) {
                    destDb.rollback();
                }
            } catch (Exception e1) {}

            throw (e);
        }

        if (!destDb.getAutoCommit()) {
            destDb.commit();

            try {
                destDb.setAutoCommit(true);
            } catch (Exception e) {}
        }
    }

    void transferData(int iMaxRows) throws Exception, SQLException {

        if (destDb.helper.needTransferTransaction()) {
            try {
                destDb.setAutoCommit(false);
            } catch (Exception e) {}
        }

        try {
            if (Stmts.bInsert) {
                if (destDb.helper.needTransferTransaction()) {
                    try {
                        destDb.setAutoCommit(false);
                    } catch (Exception e) {}
                }

                tracer.trace("Executing " + Stmts.sSourceSelect);

                TransferResultSet r = sourceDb.getData(Stmts.sSourceSelect);

                tracer.trace("Start transfering data...");
                destDb.beginDataTransfer();
                tracer.trace("Executing " + Stmts.sDestInsert);
                destDb.putData(Stmts.sDestInsert, r, iMaxRows);
                destDb.endDataTransfer();
                tracer.trace("Finished");

                if (!destDb.getAutoCommit()) {
                    destDb.commit();

                    try {
                        destDb.setAutoCommit(true);
                    } catch (Exception e) {}
                }
            }
        } catch (Exception e) {
            try {
                if (!destDb.getAutoCommit()) {
                    destDb.rollback();
                }
            } catch (Exception e1) {}

            throw (e);
        }

        if (!destDb.getAutoCommit()) {
            destDb.commit();

            try {
                destDb.setAutoCommit(true);
            } catch (Exception e) {}
        }
    }

    void transferAlter() throws Exception {

        String Statement = new String("");

        if (destDb.helper.needTransferTransaction()) {
            try {
                destDb.setAutoCommit(false);
            } catch (Exception e) {}
        }

        if (Stmts.bTransfer == false) {
            tracer.trace("Table " + Stmts.sSourceTable + " not transfered");

            return;
        }

        tracer.trace("Table " + Stmts.sSourceTable + ": start alter");

        try {
            if (Stmts.bCreateIndex) {
                if (Stmts.sDestCreateIndex.charAt(
                        Stmts.sDestCreateIndex.length() - 1) != ';') {
                    Stmts.sDestCreateIndex += ";";
                }

                int lastsemicolon = 0;
                int nextsemicolon = Stmts.sDestCreateIndex.indexOf(';');

                while (nextsemicolon > lastsemicolon) {
                    Statement = Stmts.sDestCreateIndex.substring(lastsemicolon,
                            nextsemicolon);

                    while (Statement.charAt(Statement.length() - 1) == ';') {
                        Statement = Statement.substring(0, Statement.length()
                                                        - 1);
                    }

                    try {
                        tracer.trace("Executing " + Stmts.sDestCreateIndex);
                        destDb.execute(Statement);
                    } catch (Exception e) {
                        tracer.trace("Ignoring error " + e.getMessage());
                    }

                    lastsemicolon = nextsemicolon + 1;
                    nextsemicolon = lastsemicolon
                                    + Stmts.sDestCreateIndex.substring(
                                        lastsemicolon).indexOf(';');
                }
            }

            if (Stmts.bAlter) {
                if (Stmts.sDestAlter.charAt(Stmts.sDestAlter.length() - 1)
                        != ';') {
                    Stmts.sDestAlter += ";";
                }

                int lastsemicolon = 0;
                int nextsemicolon = Stmts.sDestAlter.indexOf(';');

                while (nextsemicolon > lastsemicolon) {
                    Statement = Stmts.sDestAlter.substring(lastsemicolon,
                                                           nextsemicolon);

                    while (Statement.charAt(Statement.length() - 1) == ';') {
                        Statement = Statement.substring(0, Statement.length()
                                                        - 1);
                    }

                    try {
                        tracer.trace("Executing " + Statement);
                        destDb.execute(Statement);
                    } catch (Exception e) {
                        tracer.trace("Ignoring error " + e.getMessage());
                    }

                    lastsemicolon = nextsemicolon + 1;
                    nextsemicolon = lastsemicolon
                                    + Stmts.sDestAlter.substring(
                                        lastsemicolon).indexOf(';');
                }
            }
        } catch (Exception e) {
            try {
                if (!destDb.getAutoCommit()) {
                    destDb.rollback();
                }
            } catch (Exception e1) {}

            throw (e);
        }

        if (!destDb.getAutoCommit()) {
            destDb.commit();

            try {
                destDb.setAutoCommit(true);
            } catch (Exception e) {}
        }
    }

    private void initTypes() throws SQLException {

        if (hTypes != null) {
            return;
        }

        hTypes = destDb.helper.getSupportedTypes();
    }
}

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