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// $Id$
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/**
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* Copyright (C) 2009 EDIT
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* European Distributed Institute of Taxonomy
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* http://www.e-taxonomy.eu
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*
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* The contents of this file are subject to the Mozilla Public License Version 1.1
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* See LICENSE.TXT at the top of this package for the full license terms.
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*/
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package eu.etaxonomy.cdm.database.update;
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import org.apache.log4j.Logger;
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import eu.etaxonomy.cdm.common.monitor.IProgressMonitor;
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import eu.etaxonomy.cdm.database.DatabaseTypeEnum;
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import eu.etaxonomy.cdm.database.ICdmDataSource;
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/**
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* @author a.mueller
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* @date 16.09.2010
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*
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*/
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public class TableDroper extends AuditedSchemaUpdaterStepBase<TableDroper> implements ISchemaUpdaterStep {
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private static final Logger logger = Logger.getLogger(TableDroper.class);
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private boolean ifExists = true;
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public static final TableDroper NewInstance(String stepName, String tableName, boolean includeAudTable){
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return new TableDroper(stepName, tableName, includeAudTable, true);
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}
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/**
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* @param stepName
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* @param tableName
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* @param includeAudTable
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* @param ifExists if false, and error will be thrown if the table does not exist and can therefore not be dropped.
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* @see #NewInstance(String, String, boolean)
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* @return
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*/
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public static final TableDroper NewInstance(String stepName, String tableName, boolean includeAudTable, boolean ifExists){
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return new TableDroper(stepName, tableName, includeAudTable, ifExists);
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}
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protected TableDroper(String stepName, String tableName, boolean includeAudTable, boolean ifExists) {
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super(stepName);
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this.tableName = tableName;
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this.includeAudTable = includeAudTable;
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this.ifExists = ifExists;
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}
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@Override
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protected boolean invokeOnTable(String tableName, ICdmDataSource datasource, IProgressMonitor monitor) {
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boolean result = true;
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try {
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String updateQuery = getUpdateQueryString(tableName, datasource, monitor);
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datasource.executeUpdate(updateQuery);
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if (! this.isAuditing){
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removeFromHibernateSequences(datasource, monitor, tableName);
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}
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return result;
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} catch ( Exception e) {
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monitor.warning(e.getMessage(), e);
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logger.error(e);
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return false;
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}
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}
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private boolean removeFromHibernateSequences(ICdmDataSource datasource, IProgressMonitor monitor, String tableName) {
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try {
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String sql = " DELETE FROM hibernate_sequences WHERE sequence_name = '%s'";
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sql = String.format(sql, tableName);
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datasource.executeUpdate(sql);
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return true;
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} catch (Exception e) {
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String message = "Exception occurred when trying to read or update hibernate_sequences table for value " + this.tableName + ": " + e.getMessage();
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monitor.warning(message, e);
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logger.error(message);
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return false;
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}
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}
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public String getUpdateQueryString(String tableName, ICdmDataSource datasource, IProgressMonitor monitor) throws DatabaseTypeNotSupportedException {
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String updateQuery;
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DatabaseTypeEnum type = datasource.getDatabaseType();
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updateQuery = "DROP TABLE @ifExists @tableName ";
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if (type.equals(DatabaseTypeEnum.SqlServer2005)){
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//MySQL allows both syntaxes
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updateQuery = " if exists (select * from INFORMATION_SCHEMA.TABLES where TABLE_NAME='@tableName') BEGIN drop table @tableName end ";
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}else if (type.equals(DatabaseTypeEnum.H2) || type.equals(DatabaseTypeEnum.PostgreSQL) || type.equals(DatabaseTypeEnum.MySQL)){
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// updateQuery = "ALTER TABLE @tableName @addSeparator @columnName @columnType";
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}else{
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updateQuery = null;
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String warning = "Update step '" + this.getStepName() + "' is not supported by " + type.getName();
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monitor.warning(warning);
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throw new DatabaseTypeNotSupportedException(warning);
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}
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updateQuery = updateQuery.replace("@tableName", tableName);
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if (ifExists == true){
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updateQuery = updateQuery.replace("@ifExists", "IF EXISTS");
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}else{
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updateQuery = updateQuery.replace("@ifExists", "");
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}
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return updateQuery;
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}
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}
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