/* Copyright (c) 2001-2024, 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,
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 * 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.
 */


package org.hsqldb;

import org.hsqldb.HsqlNameManager.HsqlName;
import org.hsqldb.error.Error;
import org.hsqldb.error.ErrorCode;
import org.hsqldb.index.Index;
import org.hsqldb.index.IndexAVLCheck;
import org.hsqldb.lib.Iterator;
import org.hsqldb.lib.OrderedHashMap;
import org.hsqldb.lib.OrderedHashSet;
import org.hsqldb.persist.DataFileCache;
import org.hsqldb.persist.DataSpaceManager;
import org.hsqldb.persist.HsqlDatabaseProperties;
import org.hsqldb.persist.HsqlProperties;
import org.hsqldb.persist.PersistentStore;
import org.hsqldb.persist.RowStoreAVLDisk;
import org.hsqldb.persist.ScriptLoader;
import org.hsqldb.persist.TableSpaceManager;
import org.hsqldb.persist.TextFileOps;
import org.hsqldb.result.Result;
import org.hsqldb.result.ResultMetaData;
import org.hsqldb.rights.User;
import org.hsqldb.scriptio.ScriptWriterText;
import org.hsqldb.scriptio.ScriptWriterTextColumnNames;
import org.hsqldb.types.TimestampData;
import org.hsqldb.types.Type;

/**
 * Implementation of Statement for SQL commands.<p>
 *
 * @author Fred Toussi (fredt@users dot sourceforge.net)
 * @version 2.7.3
 * @since 1.9.0
 */
public class StatementCommand extends Statement {

    Object[] arguments;

    StatementCommand(int type, Object[] args) {
        this(type, args, null, null);
    }

    StatementCommand(
            int type,
            Object[] args,
            HsqlName[] readNames,
            HsqlName[] writeNames) {

        super(type);

        this.isTransactionStatement = true;
        this.arguments              = args;

        if (readNames != null) {
            this.readTableNames = readNames;
        }

        if (writeNames != null) {
            this.writeTableNames = writeNames;
        }

        switch (type) {

            case StatementTypes.TRUNCATE :
                group = StatementTypes.X_HSQLDB_DATABASE_OPERATION;
                break;

            case StatementTypes.EXPLAIN_PLAN :
            case StatementTypes.EXPLAIN_REFERENCES :
                group                  = StatementTypes.X_SQL_DIAGNOSTICS;
                statementReturnType    = StatementTypes.RETURN_RESULT;
                isTransactionStatement = false;
                isLogged               = false;
                break;

            case StatementTypes.DATABASE_CHECKPOINT :
                group    = StatementTypes.X_HSQLDB_DATABASE_OPERATION;
                isLogged = false;
                break;

            case StatementTypes.DATABASE_SCRIPT : {
                String name = (String) arguments[0];

                if (name == null) {
                    statementReturnType = StatementTypes.RETURN_RESULT;
                }

                group    = StatementTypes.X_HSQLDB_DATABASE_OPERATION;
                isLogged = false;
                break;
            }

            case StatementTypes.UNLOAD_DATA :
            case StatementTypes.LOAD_DATA :
            case StatementTypes.LOAD_SCRIPT : {
                group    = StatementTypes.X_HSQLDB_DATABASE_OPERATION;
                isLogged = false;
                break;
            }

            case StatementTypes.CHECK_INDEX : {
                statementReturnType = StatementTypes.RETURN_RESULT;
                group               =
                    StatementTypes.X_HSQLDB_DATABASE_OPERATION;
                isLogged            = false;
                break;
            }

            case StatementTypes.DATABASE_BACKUP :
                group = StatementTypes.X_HSQLDB_DATABASE_OPERATION;

                if (writeNames.length == 0) {
                    group = StatementTypes.X_HSQLDB_NONBLOCK_OPERATION;
                }

                isLogged = false;
                break;

            case StatementTypes.SET_DATABASE_TRANSACTION_CONTROL :
                group = StatementTypes.X_HSQLDB_DATABASE_OPERATION;
                break;

            case StatementTypes.SET_DATABASE_UNIQUE_NAME :
            case StatementTypes.SET_DATABASE_FILES_WRITE_DELAY :
            case StatementTypes.SET_DATABASE_FILES_TEMP_PATH :
            case StatementTypes.SET_DATABASE_FILES_EVENT_LOG :
                isTransactionStatement = false;
                group                  = StatementTypes.X_HSQLDB_SETTING;
                break;

            case StatementTypes.SET_DATABASE_DEFAULT_INITIAL_SCHEMA :
            case StatementTypes.SET_DATABASE_DEFAULT_TABLE_TYPE :
            case StatementTypes.SET_DATABASE_FILES_CACHE_ROWS :
            case StatementTypes.SET_DATABASE_FILES_CACHE_SIZE :
            case StatementTypes.SET_DATABASE_FILES_SCALE :
            case StatementTypes.SET_DATABASE_FILES_SPACE :
            case StatementTypes.SET_DATABASE_FILES_DEFRAG :
            case StatementTypes.SET_DATABASE_FILES_LOBS_SCALE :
            case StatementTypes.SET_DATABASE_FILES_LOBS_COMPRESSED :
            case StatementTypes.SET_DATABASE_FILES_LOG :
            case StatementTypes.SET_DATABASE_FILES_LOG_SIZE :
            case StatementTypes.SET_DATABASE_FILES_NIO :
            case StatementTypes.SET_DATABASE_FILES_SCRIPT_FORMAT :
            case StatementTypes.SET_DATABASE_AUTHENTICATION :
            case StatementTypes.SET_DATABASE_PASSWORD_CHECK :
            case StatementTypes.SET_DATABASE_PASSWORD_DIGEST :
            case StatementTypes.SET_DATABASE_PROPERTY :
            case StatementTypes.SET_DATABASE_RESULT_MEMORY_ROWS :
            case StatementTypes.SET_DATABASE_SQL_REFERENTIAL_INTEGRITY :
            case StatementTypes.SET_DATABASE_SQL :
            case StatementTypes.SET_DATABASE_DEFAULT_ISOLATION_LEVEL :
            case StatementTypes.SET_DATABASE_TRANSACTION_CONFLICT :
            case StatementTypes.SET_DATABASE_TRANSACTION_INTERRUPT :
            case StatementTypes.SET_DATABASE_GC :
            case StatementTypes.SET_DATABASE_SQL_COLLATION :
            case StatementTypes.SET_DATABASE_FILES_BACKUP_INCREMENT :
            case StatementTypes.SET_DATABASE_TEXT_SOURCE :
                group = StatementTypes.X_HSQLDB_SETTING;
                break;

            case StatementTypes.SET_DATABASE_FILES_CHECK :
                group    = StatementTypes.X_HSQLDB_SETTING;
                isLogged = false;
                break;

            case StatementTypes.SET_TABLE_CLUSTERED :
            case StatementTypes.SET_TABLE_NEW_TABLESPACE :
            case StatementTypes.SET_TABLE_SET_TABLESPACE :
                group = StatementTypes.X_HSQLDB_SCHEMA_MANIPULATION;
                break;

            case StatementTypes.SET_TABLE_SOURCE_HEADER :
                group    = StatementTypes.X_HSQLDB_SCHEMA_MANIPULATION;
                isLogged = false;
                break;

            case StatementTypes.SET_TABLE_SOURCE :
            case StatementTypes.SET_TABLE_READONLY :
                group = StatementTypes.X_HSQLDB_SCHEMA_MANIPULATION;
                break;

            case StatementTypes.DATABASE_SHUTDOWN :
                group = StatementTypes.X_HSQLDB_DATABASE_OPERATION;
                isTransactionStatement = false;
                isLogged               = false;
                break;

            case StatementTypes.SET_TABLE_TYPE :
                group = StatementTypes.X_HSQLDB_SCHEMA_MANIPULATION;
                break;

            case StatementTypes.SET_TABLE_INDEX :
                group                  = StatementTypes.X_HSQLDB_SETTING;
                isTransactionStatement = false;
                isLogged               = false;
                break;

            case StatementTypes.SET_USER_LOCAL :
            case StatementTypes.SET_USER_INITIAL_SCHEMA :
            case StatementTypes.SET_USER_PASSWORD :
                group                  = StatementTypes.X_HSQLDB_SETTING;
                isTransactionStatement = false;
                break;

            case StatementTypes.ALTER_SESSION :
                group                  = StatementTypes.X_HSQLDB_SESSION;
                isTransactionStatement = false;
                isLogged               = false;
                break;

            default :
                throw Error.runtimeError(ErrorCode.U_S0500, "StatementCommand");
        }
    }

    public Result execute(Session session) {

        Result result;

        try {
            result = getResult(session);
        } catch (Throwable t) {
            result = Result.newErrorResult(t, getSQL());
        }

        if (result.isError()) {
            result.getException().setStatementType(group, type);

            return result;
        }

        try {
            if (isLogged) {
                session.database.logger.writeOtherStatement(session, sql);
            }
        } catch (Throwable e) {
            return Result.newErrorResult(e, getSQL());
        }

        return result;
    }

    Result getResult(Session session) {

        if (this.isExplain) {
            return Result.newSingleColumnStringResult(
                "OPERATION",
                describe(session));
        }

        switch (type) {

            case StatementTypes.TRUNCATE : {
                return getTruncateResult(session);
            }

            case StatementTypes.EXPLAIN_REFERENCES : {
                HsqlName                 name = (HsqlName) arguments[0];
                boolean referenceFrom = ((Boolean) arguments[1]).booleanValue();
                OrderedHashSet<HsqlName> set;

                if (referenceFrom) {
                    SchemaObject object =
                        session.database.schemaManager.findSchemaObject(
                            name);

                    set = object.getReferences();

                    if (set == null) {
                        set = new OrderedHashSet<>();
                    }
                } else {
                    set = new OrderedHashSet<>();

                    session.database.schemaManager.getCascadingReferencesTo(
                        name,
                        set);
                }

                String[] names  = new String[]{ "OBJCT_TYPE", "OBJECT_NAME" };
                Type[] types = new Type[]{ Type.SQL_VARCHAR_DEFAULT,
                                           Type.SQL_VARCHAR_DEFAULT };
                Result   result = Result.newMultiColumnResult(names, types);

                for (int i = 0; i < set.size(); i++) {
                    HsqlName current = set.get(i);
                    Object[] data = new Object[]{ SchemaObjectSet.getName(
                        current.type), current.getSchemaQualifiedStatementName() };

                    result.navigator.add(data);
                }

                return result;
            }

            case StatementTypes.EXPLAIN_PLAN : {
                Statement statement = (Statement) arguments[0];

                return Result.newSingleColumnStringResult(
                    Tokens.T_PLAN,
                    statement.describe(session));
            }

            case StatementTypes.DATABASE_BACKUP : {
                String  path       = (String) arguments[0];
                boolean blocking   = ((Boolean) arguments[1]).booleanValue();
                boolean script     = ((Boolean) arguments[2]).booleanValue();
                boolean compressed = ((Boolean) arguments[3]).booleanValue();
                boolean files      = ((Boolean) arguments[4]).booleanValue();

                try {
                    session.checkAdmin();

                    if (session.database.getType() != DatabaseType.DB_FILE) {
                        throw Error.error(ErrorCode.DATABASE_IS_MEMORY_ONLY);
                    }

                    if (session.database.isFilesReadOnly()) {
                        throw Error.error(ErrorCode.DATABASE_IS_READONLY);
                    }

                    session.database.logger.backup(
                        path,
                        script,
                        blocking,
                        compressed,
                        files);

                    return Result.updateZeroResult;
                } catch (HsqlException e) {
                    return Result.newErrorResult(e, sql);
                }
            }

            case StatementTypes.DATABASE_CHECKPOINT : {
                boolean defrag = ((Boolean) arguments[0]).booleanValue();

                try {
                    session.checkAdmin();
                    session.checkDDLWrite();
                    session.database.logger.checkpoint(session, defrag, true);

                    return Result.updateZeroResult;
                } catch (HsqlException e) {
                    return Result.newErrorResult(e, sql);
                }
            }

            case StatementTypes.SET_DATABASE_FILES_BACKUP_INCREMENT : {
                return Result.updateZeroResult;
            }

            case StatementTypes.SET_DATABASE_FILES_CACHE_ROWS : {
                try {
                    int     value = ((Integer) arguments[0]).intValue();
                    boolean check = arguments[1] == null;

                    session.checkAdmin();
                    session.checkDDLWrite();

                    if (check) {
                        value = HsqlDatabaseProperties.getPropertyWithinRange(
                            HsqlDatabaseProperties.hsqldb_cache_rows,
                            value);
                    }

                    session.database.logger.setCacheMaxRows(value);

                    return Result.updateZeroResult;
                } catch (HsqlException e) {
                    return Result.newErrorResult(e, sql);
                }
            }

            case StatementTypes.SET_DATABASE_FILES_CACHE_SIZE : {
                try {
                    int     value = ((Integer) arguments[0]).intValue();
                    boolean check = arguments[1] == null;

                    session.checkAdmin();
                    session.checkDDLWrite();

                    if (check) {
                        value = HsqlDatabaseProperties.getPropertyWithinRange(
                            HsqlDatabaseProperties.hsqldb_cache_size,
                            value);
                    }

                    session.database.logger.setCacheSize(value);

                    return Result.updateZeroResult;
                } catch (HsqlException e) {
                    return Result.newErrorResult(e, sql);
                }
            }

            case StatementTypes.SET_DATABASE_FILES_CHECK : {
                try {
                    long value1 = ((Long) arguments[0]).longValue();
                    long value2 = ((Long) arguments[1]).longValue();

                    session.checkAdmin();
                    session.checkDDLWrite();

                    if (session.isProcessingScript()) {
                        session.database.logger.setFilesTimestamp(value1);
                        session.database.txManager.setSystemChangeNumber(
                            value1 + 1);
                    } else if (session.isProcessingLog()) {
                        if (value2 > 0) {
                            session.database.logger.setFilesTimestamp(value1);
                            session.database.txManager.setSystemChangeNumber(
                                value1 + 1);
                        }
                    }

                    return Result.updateZeroResult;
                } catch (HsqlException e) {
                    return Result.newErrorResult(e, sql);
                }
            }

            case StatementTypes.SET_DATABASE_FILES_LOBS_SCALE : {
                try {
                    int value = ((Integer) arguments[0]).intValue();

                    session.checkAdmin();
                    session.checkDDLWrite();

                    if (session.isProcessingScript()) {
                        session.database.logger.setLobFileScaleNoCheck(value);
                    } else {
                        session.database.logger.setLobFileScale(value);
                    }

                    return Result.updateZeroResult;
                } catch (HsqlException e) {
                    return Result.newErrorResult(e, sql);
                }
            }

            case StatementTypes.SET_DATABASE_FILES_LOBS_COMPRESSED : {
                try {
                    boolean mode = ((Boolean) arguments[0]).booleanValue();

                    session.checkAdmin();
                    session.checkDDLWrite();

                    if (session.isProcessingScript()) {
                        session.database.logger.setLobFileCompressedNoCheck(
                            mode);
                    } else {
                        session.database.logger.setLobFileCompressed(mode);
                    }

                    return Result.updateZeroResult;
                } catch (HsqlException e) {
                    return Result.newErrorResult(e, sql);
                }
            }

            case StatementTypes.SET_DATABASE_FILES_SCALE : {
                try {
                    int value = ((Integer) arguments[0]).intValue();

                    session.checkAdmin();
                    session.checkDDLWrite();

                    if (session.isProcessingScript()) {
                        session.database.logger.setDataFileScaleNoCheck(value);
                    } else {
                        session.database.logger.setDataFileScale(value);
                    }

                    return Result.updateZeroResult;
                } catch (HsqlException e) {
                    return Result.newErrorResult(e, sql);
                }
            }

            case StatementTypes.SET_DATABASE_FILES_SPACE : {
                try {
                    session.checkAdmin();
                    session.checkDDLWrite();

                    if (session.database.getType() == DatabaseType.DB_RES) {
                        return Result.updateZeroResult;
                    }

                    if (session.database.isFilesReadOnly()) {
                        return Result.updateZeroResult;
                    }

                    if (arguments[0] instanceof Boolean) {
                        boolean value = ((Boolean) arguments[0]).booleanValue();

                        session.database.logger.setDataFileSpace(value);
                    } else {
                        int value = ((Integer) arguments[0]).intValue();

                        session.database.logger.setDataFileSpace(value);
                    }

                    return Result.updateZeroResult;
                } catch (HsqlException e) {
                    return Result.newErrorResult(e, sql);
                }
            }

            case StatementTypes.SET_DATABASE_FILES_DEFRAG : {
                try {
                    int value = ((Integer) arguments[0]).intValue();

                    session.checkAdmin();
                    session.checkDDLWrite();

                    if (!HsqlDatabaseProperties.validateProperty(
                            HsqlDatabaseProperties.hsqldb_defrag_limit,
                            value)) {
                        throw Error.error(ErrorCode.X_42556);
                    }

                    session.database.logger.setDefagLimit(value);

                    return Result.updateZeroResult;
                } catch (HsqlException e) {
                    return Result.newErrorResult(e, sql);
                }
            }

            case StatementTypes.SET_DATABASE_FILES_EVENT_LOG : {
                try {
                    int     value    = ((Integer) arguments[0]).intValue();
                    boolean isSql    = ((Boolean) arguments[1]).booleanValue();
                    boolean internal = ((Boolean) arguments[2]).booleanValue();

                    session.checkAdmin();
                    session.checkDDLWrite();

                    if (internal) {
                        if (isSql) {
                            session.database.logger.setSqlLogLevel(value);
                        } else {
                            session.database.logger.setEventLogLevel(value);
                        }
                    } else {
                        session.database.logger.setExternalEventLogLevel(value);
                    }

                    return Result.updateZeroResult;
                } catch (HsqlException e) {
                    return Result.newErrorResult(e, sql);
                }
            }

            case StatementTypes.SET_DATABASE_FILES_NIO : {
                try {
                    session.checkAdmin();
                    session.checkDDLWrite();

                    Object v = arguments[0];

                    if (v instanceof Boolean) {
                        boolean value = ((Boolean) arguments[0]).booleanValue();

                        session.database.logger.setNioDataFile(value);
                    } else {
                        int value = ((Integer) arguments[0]).intValue();

                        value = HsqlDatabaseProperties.getPropertyWithinRange(
                            HsqlDatabaseProperties.hsqldb_nio_max_size,
                            value);

                        session.database.logger.setNioMaxSize(value);
                    }

                    return Result.updateZeroResult;
                } catch (HsqlException e) {
                    return Result.newErrorResult(e, sql);
                }
            }

            case StatementTypes.SET_DATABASE_FILES_LOG : {
                try {
                    boolean value = ((Boolean) arguments[0]).booleanValue();

                    session.checkAdmin();
                    session.checkDDLWrite();
                    session.database.logger.setLogData(value);

                    return Result.updateZeroResult;
                } catch (HsqlException e) {
                    return Result.newErrorResult(e, sql);
                }
            }

            case StatementTypes.SET_DATABASE_FILES_LOG_SIZE : {
                try {
                    int value = ((Integer) arguments[0]).intValue();

                    session.checkAdmin();
                    session.checkDDLWrite();

                    value = HsqlDatabaseProperties.getPropertyWithinRange(
                        HsqlDatabaseProperties.hsqldb_log_size,
                        value);

                    session.database.logger.setLogSize(value);

                    return Result.updateZeroResult;
                } catch (HsqlException e) {
                    return Result.newErrorResult(e, sql);
                }
            }

            case StatementTypes.SET_DATABASE_FILES_TEMP_PATH : {
                try {
                    String value = (String) arguments[0];

                    session.checkAdmin();
                    session.checkDDLWrite();

                    // no action
                    return Result.updateZeroResult;
                } catch (HsqlException e) {
                    return Result.newErrorResult(e, sql);
                }
            }

            case StatementTypes.SET_DATABASE_FILES_SCRIPT_FORMAT : {
                try {
                    int value = ((Integer) arguments[0]).intValue();

                    session.checkAdmin();
                    session.checkDDLWrite();
                    session.database.logger.setScriptType(value);

                    return Result.updateZeroResult;
                } catch (HsqlException e) {
                    return Result.newErrorResult(e, sql);
                }
            }

            case StatementTypes.SET_DATABASE_FILES_WRITE_DELAY : {
                try {
                    int value = ((Integer) arguments[0]).intValue();

                    value = HsqlDatabaseProperties.getPropertyWithinRange(
                        HsqlDatabaseProperties.hsqldb_write_delay_millis,
                        value);

                    session.checkAdmin();
                    session.checkDDLWrite();
                    session.database.logger.setWriteDelay(value);

                    return Result.updateZeroResult;
                } catch (HsqlException e) {
                    return Result.newErrorResult(e, sql);
                }
            }

            case StatementTypes.SET_DATABASE_AUTHENTICATION : {
                try {
                    Routine routine = (Routine) arguments[0];

                    session.checkAdmin();
                    session.checkDDLWrite();
                    session.database.userManager.setExtAuthenticationFunction(
                        routine);

                    return Result.updateZeroResult;
                } catch (HsqlException e) {
                    return Result.newErrorResult(e, sql);
                }
            }

            case StatementTypes.SET_DATABASE_PASSWORD_CHECK : {
                try {
                    Routine routine = (Routine) arguments[0];

                    session.checkAdmin();
                    session.checkDDLWrite();
                    session.database.userManager.setPasswordCheckFunction(
                        routine);

                    return Result.updateZeroResult;
                } catch (HsqlException e) {
                    return Result.newErrorResult(e, sql);
                }
            }

            case StatementTypes.SET_DATABASE_PASSWORD_DIGEST : {
                try {
                    String algo = (String) arguments[0];

                    session.checkAdmin();
                    session.checkDDLWrite();

                    if (!session.isProcessingScript()) {
                        return Result.updateZeroResult;
                    }

                    session.database.granteeManager.setDigestAlgo(algo);

                    return Result.updateZeroResult;
                } catch (HsqlException e) {
                    return Result.newErrorResult(e, sql);
                }
            }

            case StatementTypes.SET_DATABASE_SQL_COLLATION : {
                try {
                    String  name      = (String) arguments[0];
                    boolean padSpaces = ((Boolean) arguments[1]).booleanValue();

                    /* @todo 1.9.0 - ensure no data in character columns */
                    session.checkAdmin();
                    session.checkDDLWrite();
                    session.database.collation.setCollation(name, padSpaces);
                    session.database.schemaManager.setSchemaChangeTimestamp();

                    return Result.updateZeroResult;
                } catch (HsqlException e) {
                    return Result.newErrorResult(e, sql);
                }
            }

            case StatementTypes.SET_DATABASE_SQL_REFERENTIAL_INTEGRITY : {
                boolean mode = ((Boolean) arguments[0]).booleanValue();

                session.checkAdmin();
                session.checkDDLWrite();
                session.database.setReferentialIntegrity(mode);

                return Result.updateZeroResult;
            }

            case StatementTypes.SET_DATABASE_SQL : {
                String  property = (String) arguments[0];
                boolean mode     = ((Boolean) arguments[1]).booleanValue();
                int     value    = ((Number) arguments[2]).intValue();

                session.checkAdmin();
                session.checkDDLWrite();

                if (HsqlDatabaseProperties.sql_live_object.equals(property)) {
                    session.database.setLiveObject(mode);
                } else if (HsqlDatabaseProperties.sql_restrict_exec.equals(
                        property)) {
                    session.database.setRestrictExec(mode);
                } else if (HsqlDatabaseProperties.sql_enforce_names.equals(
                        property)) {
                    session.database.setStrictNames(mode);
                } else if (HsqlDatabaseProperties.sql_regular_names.equals(
                        property)) {
                    session.database.setRegularNames(mode);
                } else if (HsqlDatabaseProperties.sql_enforce_size.equals(
                        property)) {
                    session.database.setStrictColumnSize(mode);
                } else if (HsqlDatabaseProperties.sql_enforce_types.equals(
                        property)) {
                    session.database.setStrictTypes(mode);
                } else if (HsqlDatabaseProperties.sql_enforce_refs.equals(
                        property)) {
                    session.database.setStrictReferences(mode);
                } else if (HsqlDatabaseProperties.sql_enforce_tdcd.equals(
                        property)) {
                    session.database.setStrictTDCD(mode);
                } else if (HsqlDatabaseProperties.sql_enforce_tdcu.equals(
                        property)) {
                    session.database.setStrictTDCU(mode);
                } else if (HsqlDatabaseProperties.jdbc_translate_tti_types.equals(
                        property)) {
                    session.database.setTranslateTTI(mode);
                } else if (HsqlDatabaseProperties.sql_char_literal.equals(
                        property)) {
                    session.database.setCharacterLiteral(mode);
                } else if (HsqlDatabaseProperties.sql_concat_nulls.equals(
                        property)) {
                    session.database.setConcatNulls(mode);
                } else if (HsqlDatabaseProperties.sql_nulls_first.equals(
                        property)) {
                    session.database.setNullsFirst(mode);
                } else if (HsqlDatabaseProperties.sql_nulls_order.equals(
                        property)) {
                    session.database.setNullsOrder(mode);
                } else if (HsqlDatabaseProperties.sql_unique_nulls.equals(
                        property)) {
                    session.database.setUniqueNulls(mode);
                } else if (HsqlDatabaseProperties.sql_convert_trunc.equals(
                        property)) {
                    session.database.setConvertTrunc(mode);
                } else if (HsqlDatabaseProperties.sql_trunc_trailing.equals(
                        property)) {
                    session.database.setTruncateTrailing(mode);
                } else if (HsqlDatabaseProperties.sql_avg_scale.equals(
                        property)) {
                    value = HsqlDatabaseProperties.getPropertyWithinRange(
                        HsqlDatabaseProperties.sql_avg_scale,
                        value);

                    session.database.setAvgScale(value);
                } else if (HsqlDatabaseProperties.sql_max_recursive.equals(
                        property)) {
                    value = HsqlDatabaseProperties.getPropertyWithinRange(
                        HsqlDatabaseProperties.sql_max_recursive,
                        value);

                    session.database.setMaxRecursive(value);
                } else if (HsqlDatabaseProperties.sql_double_nan.equals(
                        property)) {
                    session.database.setDoubleNaN(mode);
                } else if (HsqlDatabaseProperties.sql_longvar_is_lob.equals(
                        property)) {
                    session.database.setLongVarIsLob(mode);
                } else if (HsqlDatabaseProperties.sql_ignore_case.equals(
                        property)) {
                    session.database.setIgnoreCase(mode);
                    session.setIgnoreCase(mode);
                } else if (HsqlDatabaseProperties.sql_syntax_db2.equals(
                        property)) {
                    session.database.setSyntaxDb2(mode);
                } else if (HsqlDatabaseProperties.sql_syntax_mss.equals(
                        property)) {
                    session.database.setSyntaxMss(mode);
                } else if (HsqlDatabaseProperties.sql_syntax_mys.equals(
                        property)) {
                    session.database.setSyntaxMys(mode);
                } else if (HsqlDatabaseProperties.sql_syntax_ora.equals(
                        property)) {
                    session.database.setSyntaxOra(mode);
                } else if (HsqlDatabaseProperties.sql_syntax_pgs.equals(
                        property)) {
                    session.database.setSyntaxPgs(mode);
                } else if (HsqlDatabaseProperties.sql_sys_index_names.equals(
                        property)) {
                    session.database.setSysIndexNames(mode);
                } else if (HsqlDatabaseProperties.sql_lowercase_ident.equals(
                        property)) {
                    session.database.setLowerCaseIndentifer(mode);
                }

                return Result.updateZeroResult;
            }

            case StatementTypes.SET_DATABASE_DEFAULT_INITIAL_SCHEMA : {
                HsqlName schema = (HsqlName) arguments[0];

                session.checkAdmin();
                session.checkDDLWrite();

                //
                session.database.schemaManager.setDefaultSchemaHsqlName(schema);
                session.database.schemaManager.setSchemaChangeTimestamp();

                //
                return Result.updateZeroResult;
            }

            case StatementTypes.SET_DATABASE_DEFAULT_TABLE_TYPE : {
                Integer type = (Integer) arguments[0];

                session.checkAdmin();
                session.checkDDLWrite();

                //
                session.database.schemaManager.setDefaultTableType(
                    type.intValue());

                //
                return Result.updateZeroResult;
            }

            case StatementTypes.SET_DATABASE_TRANSACTION_CONTROL : {
                try {
                    int mode = ((Integer) arguments[0]).intValue();

                    session.checkAdmin();
                    session.database.txManager.setTransactionControl(
                        session,
                        mode);

                    return Result.updateZeroResult;
                } catch (HsqlException e) {
                    return Result.newErrorResult(e, sql);
                }
            }

            case StatementTypes.SET_DATABASE_DEFAULT_ISOLATION_LEVEL : {
                try {
                    int mode = ((Integer) arguments[0]).intValue();

                    session.checkAdmin();

                    session.database.defaultIsolationLevel = mode;

                    return Result.updateZeroResult;
                } catch (HsqlException e) {
                    return Result.newErrorResult(e, sql);
                }
            }

            case StatementTypes.SET_DATABASE_TRANSACTION_CONFLICT : {
                try {
                    boolean mode = ((Boolean) arguments[0]).booleanValue();

                    session.checkAdmin();

                    session.database.txConflictRollback = mode;

                    return Result.updateZeroResult;
                } catch (HsqlException e) {
                    return Result.newErrorResult(e, sql);
                }
            }

            case StatementTypes.SET_DATABASE_TRANSACTION_INTERRUPT : {
                try {
                    boolean mode = ((Boolean) arguments[0]).booleanValue();

                    session.checkAdmin();

                    session.database.txInterruptRollback = mode;

                    return Result.updateZeroResult;
                } catch (HsqlException e) {
                    return Result.newErrorResult(e, sql);
                }
            }

            case StatementTypes.SET_DATABASE_GC : {
                try {
                    int count = ((Integer) arguments[0]).intValue();

                    session.checkAdmin();

                    // a no-op from version 2.5.0
                    return Result.updateZeroResult;
                } catch (HsqlException e) {
                    return Result.newErrorResult(e, sql);
                }
            }

            case StatementTypes.SET_DATABASE_PROPERTY : {
                try {
                    String property = (String) arguments[0];
                    Object value    = arguments[1];

                    session.checkAdmin();
                    session.checkDDLWrite();

                    // command is a no-op from 1.9
                    return Result.updateZeroResult;
                } catch (HsqlException e) {
                    return Result.newErrorResult(e, sql);
                }
            }

            case StatementTypes.SET_DATABASE_RESULT_MEMORY_ROWS : {
                int size = ((Integer) arguments[0]).intValue();

                session.checkAdmin();

                size = HsqlDatabaseProperties.getPropertyWithinRange(
                    HsqlDatabaseProperties.hsqldb_result_max_memory_rows,
                    size);

                session.database.setResultMaxMemoryRows(size);

                return Result.updateZeroResult;
            }

            case StatementTypes.SET_DATABASE_TEXT_SOURCE : {
                try {
                    String         source = (String) arguments[0];
                    HsqlProperties props  = null;

                    session.checkAdmin();

                    if (source.length() > 0) {
                        props = HsqlProperties.delimitedArgPairsToProps(
                            source,
                            "=",
                            ";",
                            "textdb");

                        if (props.getErrorKeys().length > 0) {
                            throw Error.error(
                                ErrorCode.TEXT_TABLE_SOURCE,
                                props.getErrorKeys()[0]);
                        }

                        session.database.logger.setDefaultTextTableProperties(
                            source,
                            props);
                    }

                    return Result.updateZeroResult;
                } catch (HsqlException e) {
                    return Result.newErrorResult(e, sql);
                }
            }

            case StatementTypes.SET_DATABASE_UNIQUE_NAME : {
                try {
                    String name = (String) arguments[0];

                    session.checkAdmin();
                    session.database.setDatabaseName(name);

                    return Result.updateZeroResult;
                } catch (HsqlException e) {
                    return Result.newErrorResult(e, sql);
                }
            }

            case StatementTypes.DATABASE_SCRIPT : {
                ScriptWriterText dsw       = null;
                String           name      = (String) arguments[0];
                Integer          scope     = (Integer) arguments[1];
                Integer          type      = (Integer) arguments[2];
                Boolean          colNames  = (Boolean) arguments[3];
                HsqlName         tableName = (HsqlName) arguments[4];
                TimestampData    timestamp = (TimestampData) arguments[5];

                try {
                    if (!session.getGrantee().canPerformScriptOps()) {
                        throw Error.error(ErrorCode.X_42507);
                    }

                    if (session.isProcessingScript()
                            || session.isProcessingLog()) {
                        return Result.updateZeroResult;
                    }

                    if (name == null) {
                        return session.database.getScript(false);
                    } else {
                        if (colNames.booleanValue()) {
                            dsw = new ScriptWriterTextColumnNames(
                                session.database,
                                name);
                        } else {
                            dsw = new ScriptWriterText(
                                session.database,
                                name,
                                true,
                                true,
                                true);
                        }

                        switch (type.intValue()) {

                            case Tokens.ALL :
                                dsw.writeAll();
                                break;

                            case Tokens.STRUCTURE :
                                dsw.writeDDL();
                                break;

                            case Tokens.DATA :
                                if (tableName == null) {
                                    dsw.writeExistingData(false);
                                } else {
                                    Table table =
                                        session.database.schemaManager.getUserTable(
                                            tableName);

                                    dsw.setIncludeTableInit(true);
                                    dsw.writeTableData(table);
                                }

                                break;

                            case Tokens.VERSIONING :
                                dsw.writeVersioningData(timestamp);
                                break;
                        }

                        dsw.close();

                        return Result.updateZeroResult;
                    }
                } catch (HsqlException e) {
                    return Result.newErrorResult(e, sql);
                }
            }

            case StatementTypes.DATABASE_SHUTDOWN : {
                try {
                    int mode = ((Integer) arguments[0]).intValue();

                    session.checkAdmin();
                    session.database.close(mode);

                    return Result.updateZeroResult;
                } catch (HsqlException e) {
                    return Result.newErrorResult(e, sql);
                }
            }

            case StatementTypes.LOAD_SCRIPT : {
                try {
                    String  pathName     = (String) arguments[0];
                    int     mode         = ((Integer) arguments[1]).intValue();
                    Boolean isVersioning = (Boolean) arguments[2];

                    if (!session.getGrantee().canPerformScriptOps()) {
                        throw Error.error(ErrorCode.X_42507);
                    }

                    if (session.isProcessingScript()
                            || session.isProcessingLog()) {
                        return Result.updateZeroResult;
                    }

                    return ScriptLoader.loadScriptData(
                        session,
                        pathName,
                        mode,
                        isVersioning.booleanValue());
                } catch (HsqlException e) {
                    return Result.newErrorResult(e, sql);
                }
            }

            case StatementTypes.LOAD_DATA : {
                try {
                    HsqlName tableName = (HsqlName) arguments[0];
                    String   textprops = (String) arguments[1];
                    int      mode      = ((Integer) arguments[2]).intValue();
                    Table table = session.database.schemaManager.findTable(
                        session,
                        tableName.name,
                        tableName.schema.name,
                        null);

                    if (table == null) {
                        throw Error.error(
                            ErrorCode.X_42501,
                            tableName.getSchemaQualifiedStatementName());
                    }

                    if (!session.getGrantee().canPerformScriptOps()) {
                        throw Error.error(ErrorCode.X_42507);
                    }

                    if (session.isProcessingScript()
                            || session.isProcessingLog()) {
                        return Result.updateZeroResult;
                    }

                    return TextFileOps.loadTextData(
                        session,
                        textprops,
                        table,
                        mode);
                } catch (HsqlException e) {
                    return Result.newErrorResult(e, sql);
                }
            }

            case StatementTypes.UNLOAD_DATA : {
                try {
                    HsqlName tableName = (HsqlName) arguments[0];
                    String   textprops = (String) arguments[1];
                    Table table = session.database.schemaManager.findTable(
                        session,
                        tableName.name,
                        tableName.schema.name,
                        null);

                    if (table == null) {
                        throw Error.error(
                            ErrorCode.X_42501,
                            tableName.getSchemaQualifiedStatementName());
                    }

                    if (!session.getGrantee().canPerformScriptOps()) {
                        throw Error.error(ErrorCode.X_42507);
                    }

                    if (session.isProcessingScript()
                            || session.isProcessingLog()) {
                        return Result.updateZeroResult;
                    }

                    return TextFileOps.unloadTextData(
                        session,
                        textprops,
                        table);
                } catch (HsqlException e) {
                    return Result.newErrorResult(e, sql);
                }
            }

            case StatementTypes.CHECK_INDEX : {
                try {
                    HsqlName tableName = (HsqlName) arguments[0];
                    int      type      = ((Integer) arguments[1]).intValue();
                    Table    table;
                    Result   result;

                    if (tableName == null) {
                        result = IndexAVLCheck.checkAllTables(session, type);
                    } else {
                        table = session.database.schemaManager.getUserTable(
                            tableName);
                        result = IndexAVLCheck.checkTable(session, table, type);
                    }

                    return result;
                } catch (HsqlException e) {
                    return Result.newErrorResult(e, sql);
                }
            }

            case StatementTypes.SET_TABLE_NEW_TABLESPACE : {
                try {
                    HsqlName name = (HsqlName) arguments[0];
                    Table table = session.database.schemaManager.getUserTable(
                        name);

                    session.checkAdmin();
                    session.checkDDLWrite();

                    if (!session.database.logger.isFileDatabase()) {
                        return Result.updateZeroResult;
                    }

                    if (session.database.logger.getDataFileSpace() == 0) {
                        throw Error.error(ErrorCode.ACCESS_IS_DENIED);
                    }

                    if (table.getSpaceID() != DataSpaceManager.tableIdDefault) {
                        return Result.updateZeroResult;
                    }

                    DataFileCache cache = session.database.logger.getCache();

                    // memory database
                    if (cache == null) {
                        return Result.updateZeroResult;
                    }

                    DataSpaceManager dataSpace = cache.spaceManager;
                    int tableSpaceID           = dataSpace.getNewTableSpaceID();

                    // if cache exists, a memory table can get a space id
                    // it can then be converted to cached
                    table.setSpaceID(tableSpaceID);

                    if (!table.isCached()) {
                        return Result.updateZeroResult;
                    }

                    if (!dataSpace.isMultiSpace()) {
                        return Result.updateZeroResult;
                    }

                    RowStoreAVLDisk store = (RowStoreAVLDisk) table.getRowStore(
                        session);

                    store.setSpaceManager(session);

                    return Result.updateZeroResult;
                } catch (HsqlException e) {
                    return Result.newErrorResult(e, sql);
                }
            }

            case StatementTypes.SET_TABLE_SET_TABLESPACE : {
                try {
                    HsqlName name    = (HsqlName) arguments[0];
                    int      spaceid = ((Integer) arguments[1]).intValue();
                    Table table = session.database.schemaManager.getUserTable(
                        name);

                    if (!session.isProcessingScript()) {
                        return Result.updateZeroResult;
                    }

                    if (table.getTableType() != TableBase.CACHED_TABLE) {
                        return Result.updateZeroResult;
                    }

                    if (table.getSpaceID() != DataSpaceManager.tableIdDefault) {
                        return Result.updateZeroResult;
                    }

                    DataFileCache cache = session.database.logger.getCache();

                    if (cache == null) {
                        return Result.updateZeroResult;
                    }

                    table.setSpaceID(spaceid);

                    DataSpaceManager dataSpace = cache.spaceManager;
                    TableSpaceManager tableSpace = dataSpace.getTableSpace(
                        table.getSpaceID());
                    PersistentStore  store     = table.getRowStore(session);

                    store.setSpaceManager(tableSpace);

                    return Result.updateZeroResult;
                } catch (HsqlException e) {
                    return Result.newErrorResult(e, sql);
                }
            }

            case StatementTypes.SET_TABLE_CLUSTERED : {
                try {
                    HsqlName name     = (HsqlName) arguments[0];
                    int[]    colIndex = (int[]) arguments[1];
                    Table table = session.database.schemaManager.getUserTable(
                        name);

                    StatementSchema.checkSchemaUpdateAuthorisation(
                        session,
                        table.getSchemaName());

                    if (!table.isCached() && !table.isText()) {
                        throw Error.error(ErrorCode.ACCESS_IS_DENIED);
                    }

                    Index index = table.getIndexForColumns(colIndex);

                    if (index != null) {
                        Index[] indexes = table.getIndexList();

                        for (int i = 0; i < indexes.length; i++) {
                            indexes[i].setClustered(false);
                        }

                        index.setClustered(true);
                    }

                    return Result.updateZeroResult;
                } catch (HsqlException e) {
                    return Result.newErrorResult(e, sql);
                }
            }

            case StatementTypes.SET_TABLE_INDEX : {
                try {
                    HsqlName name  = (HsqlName) arguments[0];
                    String   value = (String) arguments[1];
                    Integer  type  = (Integer) arguments[2];
                    Table table = session.database.schemaManager.getUserTable(
                        name);

                    if (session.isProcessingScript()) {
                        table.setIndexRoots(session, value);
                    }

                    return Result.updateZeroResult;
                } catch (HsqlException e) {
                    return Result.newErrorResult(e, sql);
                }
            }

            case StatementTypes.SET_TABLE_READONLY : {
                try {
                    HsqlName name = (HsqlName) arguments[0];
                    Table table = session.database.schemaManager.getUserTable(
                        name);
                    boolean  mode = ((Boolean) arguments[1]).booleanValue();

                    StatementSchema.checkSchemaUpdateAuthorisation(
                        session,
                        table.getSchemaName());
                    table.setDataReadOnly(mode);
                    session.database.schemaManager.setSchemaChangeTimestamp();

                    return Result.updateZeroResult;
                } catch (HsqlException e) {
                    return Result.newErrorResult(e, sql);
                }
            }

            case StatementTypes.SET_TABLE_SOURCE :
            case StatementTypes.SET_TABLE_SOURCE_HEADER : {
                HsqlName name     = (HsqlName) arguments[0];
                Boolean  mode     = (Boolean) arguments[1];
                String   source   = (String) arguments[2];
                Boolean  isDesc   = (Boolean) arguments[3];
                Boolean  isHeader = (Boolean) arguments[4];
                Table    table    = null;

                try {
                    table = session.database.schemaManager.getUserTable(name);

                    StatementSchema.checkSchemaUpdateAuthorisation(
                        session,
                        table.getSchemaName());

                    if (!table.isText()) {
                        Exception e = Error.error(ErrorCode.X_S0522);

                        return Result.newErrorResult(e, sql);
                    }

                    if (mode != null) {
                        if (mode.booleanValue()) {
                            ((TextTable) table).connect(session);
                        } else {
                            ((TextTable) table).disconnect();
                        }

                        session.database.schemaManager.setSchemaChangeTimestamp();

                        return Result.updateZeroResult;
                    }

                    if (isHeader.booleanValue()) {
                        ((TextTable) table).setHeader(source);
                    } else {
                        ((TextTable) table).setDataSource(
                            session,
                            source,
                            isDesc.booleanValue(),
                            false);
                    }

                    return Result.updateZeroResult;
                } catch (Throwable e) {
                    if (!(e instanceof HsqlException)) {
                        e = Error.error(
                            e,
                            ErrorCode.GENERAL_IO_ERROR,
                            e.toString());
                    }

                    if (session.isProcessingLog()
                            || session.isProcessingScript()) {
                        session.addWarning((HsqlException) e);
                        session.database.logger.logWarningEvent(
                            "Problem processing SET TABLE SOURCE",
                            e);
                        ((TextTable) table).setDataSource(
                            source,
                            isDesc.booleanValue());

                        return Result.updateZeroResult;
                    } else {
                        return Result.newErrorResult(e, sql);
                    }
                }
            }

            case StatementTypes.SET_TABLE_TYPE : {
                try {
                    HsqlName name = (HsqlName) arguments[0];
                    int      type = ((Integer) arguments[1]).intValue();

                    //
                    Table table = session.database.schemaManager.getUserTable(
                        name);
                    int             oldType  = table.getTableType();
                    PersistentStore oldStore = table.getRowStore(session);

                    if (oldType == type) {
                        return Result.updateZeroResult;
                    }

                    StatementSchema.checkSchemaUpdateAuthorisation(
                        session,
                        table.getSchemaName());

                    TableWorks tw     = new TableWorks(session, table);
                    boolean    result = tw.setTableType(type);

                    if (!result) {
                        throw Error.error(ErrorCode.GENERAL_IO_ERROR);
                    }

                    session.database.schemaManager.setSchemaChangeTimestamp();

                    if (name.schema == SqlInvariants.LOBS_SCHEMA_HSQLNAME) {
                        session.database.lobManager.compileStatements();
                    }

                    return Result.updateZeroResult;
                } catch (HsqlException e) {
                    return Result.newErrorResult(e, sql);
                }
            }

            case StatementTypes.SET_USER_LOCAL : {
                User    user = (User) arguments[0];
                boolean mode = ((Boolean) arguments[1]).booleanValue();

                session.checkAdmin();
                session.checkDDLWrite();

                user.isLocalOnly = mode;

                session.database.schemaManager.setSchemaChangeTimestamp();

                return Result.updateZeroResult;
            }

            case StatementTypes.SET_USER_INITIAL_SCHEMA : {
                try {
                    User     user   = (User) arguments[0];
                    HsqlName schema = (HsqlName) arguments[1];

                    session.checkDDLWrite();

                    if (user == null) {
                        user = session.getUser();
                    } else {
                        session.checkAdmin();
                        session.checkDDLWrite();

                        user = session.database.userManager.get(
                            user.getName().getNameString());
                    }

                    if (schema != null) {
                        schema =
                            session.database.schemaManager.getSchemaHsqlName(
                                schema.name);
                    }

                    //
                    user.setInitialSchema(schema);
                    session.database.schemaManager.setSchemaChangeTimestamp();

                    //
                    return Result.updateZeroResult;
                } catch (HsqlException e) {
                    return Result.newErrorResult(e, sql);
                }
            }

            case StatementTypes.SET_USER_PASSWORD : {
                try {
                    User    user     = arguments[0] == null
                                       ? session.getUser()
                                       : (User) arguments[0];
                    String  password = (String) arguments[1];
                    boolean isDigest = (Boolean) arguments[2];

                    session.checkDDLWrite();
                    session.database.userManager.setPassword(
                        session,
                        user,
                        password,
                        isDigest);

                    return Result.updateZeroResult;
                } catch (HsqlException e) {
                    return Result.newErrorResult(e, sql);
                }
            }

            case StatementTypes.ALTER_SESSION : {
                try {
                    long sessionID = ((Number) arguments[0]).longValue();
                    int  action    = ((Number) arguments[1]).intValue();
                    Session targetSession =
                        session.database.sessionManager.getSession(
                            sessionID);

                    if (targetSession == null) {
                        throw Error.error(ErrorCode.X_2E000);
                    }

                    switch (action) {

                        case Tokens.ALL :
                            session.database.txManager.resetSession(
                                session,
                                targetSession,
                                Long.MAX_VALUE,
                                TransactionManager.resetSessionResetAll);
                            break;

                        case Tokens.TABLE :
                            session.database.txManager.resetSession(
                                session,
                                targetSession,
                                Long.MAX_VALUE,
                                TransactionManager.resetSessionTables);
                            break;

                        case Tokens.RESULT :
                            session.database.txManager.resetSession(
                                session,
                                targetSession,
                                Long.MAX_VALUE,
                                TransactionManager.resetSessionResults);
                            break;

                        case Tokens.CLOSE :
                            session.database.txManager.resetSession(
                                session,
                                targetSession,
                                Long.MAX_VALUE,
                                TransactionManager.resetSessionClose);
                            break;

                        case Tokens.RELEASE :
                            session.database.txManager.resetSession(
                                session,
                                targetSession,
                                Long.MAX_VALUE,
                                TransactionManager.resetSessionRollback);
                            break;

                        case Tokens.END :
                            if (session == targetSession) {
                                return Result.updateZeroResult;
                            }

                            session.database.txManager.resetSession(
                                session,
                                targetSession,
                                targetSession.statementStartSCN,
                                TransactionManager.resetSessionStatement);
                            break;
                    }
                } catch (HsqlException e) {
                    return Result.newErrorResult(e, sql);
                }

                return Result.updateZeroResult;
            }

            default :
                throw Error.runtimeError(ErrorCode.U_S0500, "StatementCommand");
        }
    }

    Result getTruncateResult(Session session) {

        try {
            HsqlName      name            = (HsqlName) arguments[0];
            boolean       restartIdentity = (Boolean) arguments[1];
            boolean       noCheck         = (Boolean) arguments[2];
            TimestampData timestamp       = (TimestampData) arguments[3];
            Table[]       tables;

            if (name.type == SchemaObject.TABLE) {
                Table table = session.database.schemaManager.getUserTable(name);

                tables = new Table[]{ table };

                session.getGrantee().checkDelete(table);

                if (timestamp != null) {
                    TablePeriodWorks works = new TablePeriodWorks(
                        session,
                        table);
                    long count = works.removeOldRows(timestamp.getSeconds());

                    return Result.newUpdateCountResult(0);
                }

                if (!noCheck) {
                    for (int i = 0; i < table.fkMainConstraints.length; i++) {
                        if (table.fkMainConstraints[i].getRef() != table) {
                            HsqlName tableName =
                                table.fkMainConstraints[i].getRef()
                                                          .getName();
                            Table refTable =
                                session.database.schemaManager.getUserTable(
                                    tableName);

                            if (!refTable.isEmpty(session)) {
                                throw Error.error(
                                    ErrorCode.X_23504,
                                    refTable.getName().name);
                            }
                        }
                    }
                }
            } else {

                // ensure schema existence
                session.database.schemaManager.getSchemaHsqlName(name.name);

                OrderedHashMap<String, Table> list =
                    session.database.schemaManager.getTables(
                        name.name);

                tables = new Table[list.size()];

                list.valuesToArray(tables);
                StatementSchema.checkSchemaUpdateAuthorisation(session, name);

                if (!noCheck) {
                    OrderedHashSet<HsqlName> set = new OrderedHashSet<>();

                    session.database.schemaManager.getCascadingReferencesToSchema(
                        name,
                        set);

                    for (int i = 0; i < set.size(); i++) {
                        HsqlName objectName = set.get(i);

                        if (objectName.type == SchemaObject.CONSTRAINT) {
                            if (objectName.parent.type == SchemaObject.TABLE) {
                                Table refTable =
                                    session.database.schemaManager.getUserTable(
                                        objectName.parent);

                                if (!refTable.isEmpty(session)) {
                                    throw Error.error(
                                        ErrorCode.X_23504,
                                        refTable.getName().name);
                                }
                            }
                        }
                    }
                }

                if (restartIdentity) {
                    Iterator<SchemaObject> it =
                        session.database.schemaManager.databaseObjectIterator(
                            name.name,
                            SchemaObject.SEQUENCE);

                    while (it.hasNext()) {
                        NumberSequence sequence = (NumberSequence) it.next();

                        sequence.reset();
                    }
                }
            }

            for (int i = 0; i < tables.length; i++) {
                Table           table = tables[i];
                PersistentStore store = table.getRowStore(session);

                store.removeAll();

                if (restartIdentity && table.identitySequence != null) {
                    table.identitySequence.reset();
                }
            }

            return Result.updateZeroResult;
        } catch (HsqlException e) {
            return Result.newErrorResult(e, sql);
        }
    }

    public ResultMetaData getResultMetaData() {

        switch (type) {

            case StatementTypes.EXPLAIN_PLAN :
                return ResultMetaData.newSingleColumnMetaData(Tokens.T_PLAN);

            case StatementTypes.EXPLAIN_REFERENCES :
                return ResultMetaData.newSingleColumnMetaData(
                    Tokens.T_REFERENCES);

            case StatementTypes.DATABASE_SCRIPT :
                if (statementReturnType == StatementTypes.RETURN_RESULT) {
                    return ResultMetaData.newSingleColumnMetaData("STATEMENTS");
                }

                return super.getResultMetaData();

            default :
                return super.getResultMetaData();
        }
    }

    public boolean isAutoCommitStatement() {
        return isTransactionStatement;
    }

    public String describe(Session session) {
        return sql;
    }
}
