| /* |
| * 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 org.apache.commons.lang.StringUtils; |
| |
| import java.sql.Connection; |
| import java.sql.PreparedStatement; |
| import java.sql.ResultSet; |
| import java.sql.SQLException; |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| /** |
| * Select a record from a database. If request parameters are present, |
| * their values are used to populate request attributes. Otherwise, |
| * values from database are used. |
| * |
| * @author <a href="mailto:bloritsch@apache.org">Berin Loritsch</a> |
| * @author <a href="mailto:vgritsenko@apache.org">Vadim Gritsenko</a> |
| * @version CVS $Id$ |
| */ |
| public class DatabaseSelectAction extends AbstractDatabaseAction implements ThreadSafe { |
| |
| private static final Map selectStatements = new HashMap(); |
| |
| /** |
| * Select a record from the database. This action assumes that |
| * the file referenced by the "descriptor" parameter conforms |
| * to the AbstractDatabaseAction specifications. |
| */ |
| public 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)); |
| |
| Request request = ObjectModelHelper.getRequest(objectModel); |
| |
| Configuration[] keys = conf.getChild("table").getChild("keys").getChildren("key"); |
| Configuration[] values = conf.getChild("table").getChild("values").getChildren("value"); |
| |
| PreparedStatement statement = null; |
| ResultSet rset = null; |
| boolean result = false; |
| |
| for (int i = 0; i < keys.length; i++) { |
| final String parameter = keys[i].getAttribute("param"); |
| Object value = request.getParameter(parameter); |
| if (StringUtils.isEmpty((String)value)) { |
| if (statement == null) { |
| final String query = this.getSelectQuery(conf); |
| datasource = this.getDataSource(conf); |
| conn = datasource.getConnection(); |
| statement = conn.prepareStatement(query); |
| currentIndex = 1; |
| for (int j = 0; j < keys.length; j++, currentIndex++) { |
| this.setColumn(statement, currentIndex, request, keys[j]); |
| } |
| rset = statement.executeQuery(); |
| result = rset.next(); |
| } |
| if (result) { |
| value = this.getColumn(rset, request, keys[i]); |
| } |
| } |
| if (value != null) { |
| request.setAttribute(parameter, value.toString()); |
| } |
| } |
| |
| for (int i = 0; i < values.length; i++) { |
| final String parameter = values[i].getAttribute("param"); |
| Object value = request.getParameter(parameter); |
| if (StringUtils.isEmpty((String)value)) { |
| if (statement == null) { |
| final String query = this.getSelectQuery(conf); |
| datasource = this.getDataSource(conf); |
| conn = datasource.getConnection(); |
| statement = conn.prepareStatement(query); |
| currentIndex = 1; |
| for (int j = 0; j < keys.length; j++, currentIndex++) { |
| this.setColumn(statement, currentIndex, request, keys[j]); |
| } |
| rset = statement.executeQuery(); |
| result = rset.next(); |
| } |
| if (result) { |
| value = this.getColumn(rset, request, values[i]); |
| } |
| } |
| if (value != null) { |
| request.setAttribute(parameter, value.toString()); |
| } |
| } |
| if(statement != null) { |
| statement.close(); |
| } |
| return EMPTY_MAP; |
| } catch (Exception e) { |
| throw new ProcessingException("Could not prepare statement :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); |
| } |
| } |
| |
| // Result is empty map or exception. No 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. |
| */ |
| protected String getSelectQuery(Configuration conf) throws ConfigurationException { |
| String query = null; |
| |
| synchronized (DatabaseSelectAction.selectStatements) { |
| query = (String)DatabaseSelectAction.selectStatements.get(conf); |
| |
| if (query == null) { |
| Configuration table = conf.getChild("table"); |
| Configuration[] keys = table.getChild("keys").getChildren("key"); |
| Configuration[] values = table.getChild("values").getChildren("value"); |
| |
| StringBuffer queryBuffer = new StringBuffer("SELECT "); |
| queryBuffer.append(buildList(keys, 0)); |
| queryBuffer.append(buildList(values, keys.length)); |
| queryBuffer.append(" FROM "); |
| queryBuffer.append(table.getAttribute("name")); |
| |
| queryBuffer.append(" WHERE "); |
| queryBuffer.append(buildList(keys, " AND ")); |
| query = queryBuffer.toString(); |
| |
| DatabaseSelectAction.selectStatements.put(conf, query); |
| } |
| } |
| return query; |
| } |
| } |