| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.cocoon.acting; |
| |
| import org.apache.avalon.excalibur.datasource.DataSourceComponent; |
| import org.apache.avalon.framework.configuration.Configuration; |
| import org.apache.avalon.framework.configuration.ConfigurationException; |
| import org.apache.avalon.framework.parameters.Parameters; |
| import org.apache.avalon.framework.thread.ThreadSafe; |
| import org.apache.cocoon.Constants; |
| import org.apache.cocoon.ProcessingException; |
| import org.apache.cocoon.environment.ObjectModelHelper; |
| import org.apache.cocoon.environment.Redirector; |
| import org.apache.cocoon.environment.Request; |
| import org.apache.cocoon.environment.SourceResolver; |
| |
| import java.sql.Connection; |
| import java.sql.PreparedStatement; |
| import java.sql.SQLException; |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| /** |
| * Delete a record from a database. This Action assumes that all |
| * dependant data is either automatically cleaned up by cascading |
| * deletes, or that multiple instances of this action are being used |
| * in the correct order. In other words, it removes one record by |
| * the keys. |
| * |
| * @author <a href="mailto:bloritsch@apache.org">Berin Loritsch</a> |
| * @version CVS $Id$ |
| */ |
| public final class DatabaseDeleteAction extends AbstractDatabaseAction implements ThreadSafe { |
| private static final Map deleteStatements = new HashMap(); |
| |
| /** |
| * Delete a record from the database. This action assumes that |
| * the file referenced by the "descriptor" parameter conforms |
| * to the AbstractDatabaseAction specifications. |
| */ |
| public final Map act(Redirector redirector, SourceResolver resolver, Map objectModel, String source, Parameters param) throws Exception { |
| DataSourceComponent datasource = null; |
| Connection conn = null; |
| int currentIndex = 0; |
| |
| // read global parameter settings |
| boolean reloadable = Constants.DESCRIPTOR_RELOADABLE_DEFAULT; |
| if (this.settings.containsKey("reloadable")) |
| reloadable = Boolean.valueOf((String) this.settings.get("reloadable")).booleanValue(); |
| // read local parameter settings |
| try { |
| Configuration conf = |
| this.getConfiguration(param.getParameter("descriptor", (String) this.settings.get("descriptor")), resolver, |
| param.getParameterAsBoolean("reloadable",reloadable)); |
| |
| String query = this.getDeleteQuery(conf); |
| datasource = this.getDataSource(conf); |
| conn = datasource.getConnection(); |
| Request request = ObjectModelHelper.getRequest(objectModel); |
| |
| if (conn.getAutoCommit()) { |
| conn.setAutoCommit(false); |
| } |
| |
| PreparedStatement statement = conn.prepareStatement(query); |
| |
| Configuration[] keys = conf.getChild("table").getChild("keys").getChildren("key"); |
| |
| for (int i = 0; i < keys.length; i++) { |
| this.setColumn(statement, i + 1, request, keys[i]); |
| } |
| |
| int rows = statement.executeUpdate(); |
| conn.commit(); |
| statement.close(); |
| |
| if (rows > 0) { |
| request.setAttribute("rows", Integer.toString(rows)); |
| return EMPTY_MAP; |
| } |
| } catch (Exception e) { |
| if (conn != null) { |
| conn.rollback(); |
| } |
| throw new ProcessingException("Could not delete record :position = " + currentIndex, e); |
| } finally { |
| if (conn != null) { |
| try { |
| conn.close(); |
| } catch (SQLException sqe) { |
| getLogger().warn("There was an error closing the datasource", sqe); |
| } |
| } |
| if (datasource != null) { |
| this.dbselector.release(datasource); |
| } |
| } |
| return null; |
| } |
| |
| /** |
| * Get the String representation of the PreparedStatement. This is |
| * mapped to the Configuration object itself, so if it doesn't exist, |
| * it will be created. |
| */ |
| private final String getDeleteQuery(Configuration conf) throws ConfigurationException { |
| String query = null; |
| |
| synchronized (DatabaseDeleteAction.deleteStatements) { |
| query = (String) DatabaseDeleteAction.deleteStatements.get(conf); |
| |
| if (query == null) { |
| Configuration table = conf.getChild("table"); |
| Configuration[] keys = table.getChild("keys").getChildren("key"); |
| |
| StringBuffer queryBuffer = new StringBuffer("DELETE FROM "); |
| queryBuffer.append(table.getAttribute("name")); |
| queryBuffer.append(" WHERE "); |
| queryBuffer.append(buildList(keys, " AND ")); |
| query = queryBuffer.toString(); |
| |
| DatabaseDeleteAction.deleteStatements.put(conf, query); |
| } |
| } |
| return query; |
| } |
| } |