transfertable.java

一个用java写的开源的数据库系统

                    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) {}
        }
    }

    /**
     * Method declaration
     *
     *
     * @param t
     *
     * @throws SQLException
     */
    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();
    }
}