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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 java.sql.SQLException;
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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 ColumnRemover extends SchemaUpdaterStepBase<ColumnRemover> implements ISchemaUpdaterStep {
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@SuppressWarnings("unused")
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private static final Logger logger = Logger.getLogger(ColumnRemover.class);
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private String tableName;
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private String oldColumnName;
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private boolean includeAudTable;
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public static final ColumnRemover NewInstance(String stepName, String tableName, String oldColumnName, boolean includeAudTable){
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return new ColumnRemover(stepName, tableName, oldColumnName, includeAudTable);
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}
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protected ColumnRemover(String stepName, String tableName, String oldColumnName, boolean includeAudTable) {
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super(stepName);
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this.tableName = tableName;
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this.oldColumnName = oldColumnName;
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this.includeAudTable = includeAudTable;
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}
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/* (non-Javadoc)
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* @see eu.etaxonomy.cdm.database.update.SchemaUpdaterStepBase#invoke(eu.etaxonomy.cdm.database.ICdmDataSource, eu.etaxonomy.cdm.common.IProgressMonitor)
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*/
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@Override
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public Integer invoke(ICdmDataSource datasource, IProgressMonitor monitor) throws SQLException {
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boolean result = true;
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result &= removeColumn(tableName, datasource, monitor);
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if (includeAudTable){
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String aud = "_AUD";
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result &= removeColumn(tableName + aud, datasource, monitor);
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}
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return (result == true )? 0 : null;
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}
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private boolean removeColumn(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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try {
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datasource.executeUpdate(updateQuery);
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} catch (SQLException e) {
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logger.error(e);
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result = false;
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}
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return result;
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} catch ( DatabaseTypeNotSupportedException e) {
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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 = "ALTER TABLE @tableName DROP COLUMN @columnName";
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if (type.equals(DatabaseTypeEnum.SqlServer2005)){
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//MySQL allows both syntaxes
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// updateQuery = "ALTER TABLE @tableName ADD @columnName @columnType";
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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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updateQuery = updateQuery.replace("@columnName", oldColumnName);
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return updateQuery;
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}
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// public static String getDropColumnSeperator(ICdmDataSource datasource) throws DatabaseTypeNotSupportedException {
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// DatabaseTypeEnum type = datasource.getDatabaseType();
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// if (type.equals(DatabaseTypeEnum.SqlServer2005)){
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// return "DROP ";
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// }else if (type.equals(DatabaseTypeEnum.H2) || type.equals(DatabaseTypeEnum.PostgreSQL) || type.equals(DatabaseTypeEnum.MySQL)){
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// return "DROP COLUMN ";
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// }else{
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// throw new DatabaseTypeNotSupportedException(datasource.getName());
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// }
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// }
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}
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