2 * Copyright (C) 2001, 2002 The Mir-coders group
4 * This file is part of Mir.
6 * Mir is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * Mir is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with Mir; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 * In addition, as a special exception, The Mir-coders gives permission to link
21 * the code of this program with any library licensed under the Apache Software License,
22 * The Sun (tm) Java Advanced Imaging library (JAI), The Sun JIMI library
23 * (or with modified versions of the above that use the same license as the above),
24 * and distribute linked combinations including the two. You must obey the
25 * GNU General Public License in all respects for all of the code used other than
26 * the above mentioned libraries. If you modify this file, you may extend this
27 * exception to your version of the file, but you are not obligated to do so.
28 * If you do not wish to do so, delete this exception statement from your version.
32 import java.sql.Connection;
33 import java.sql.DriverManager;
34 import java.sql.ResultSet;
35 import java.sql.ResultSetMetaData;
36 import java.sql.Statement;
37 import java.util.ArrayList;
38 import java.util.HashMap;
39 import java.util.Iterator;
42 import mir.log.LoggerWrapper;
43 import mir.util.ExceptionFunctions;
44 import mir.util.ParameterExpander;
46 public class ExternalDbProducerNode extends ProducerNodeDecorator {
48 private String driver;
51 private String database;
52 private String username;
53 private String password;
57 public ExternalDbProducerNode(String aKey, String aDriver, String aHost, String aPort, String aDatabase, String aUsername, String aPassword,String aQuery,ProducerNode aSubNode) {
70 public void produce(Map aValueMap, String aVerb, LoggerWrapper aLogger) throws ProducerFailure {
72 String expandedKey = ParameterExpander.expandExpression( aValueMap, key );
73 String expandedDriver = ParameterExpander.expandExpression( aValueMap, driver);
74 String expandedHost = ParameterExpander.expandExpression( aValueMap, host);
75 String expandedPort = ParameterExpander.expandExpression( aValueMap, port);
76 String expandedDatabase = ParameterExpander.expandExpression( aValueMap, database);
77 String expandedUsername = ParameterExpander.expandExpression( aValueMap, username);
78 String expandedPassword = ParameterExpander.expandExpression( aValueMap, password);
79 String expandedQuery = ParameterExpander.expandExpression( aValueMap, query);
81 if (expandedDriver.equals("postgresql")){
82 Class.forName("org.postgresql.Driver");
84 if (expandedDriver.equals("mysql")){
85 Class.forName("com.mysql.jdbc.Driver");
88 throw new Exception("Unsupported DB Driver:"+expandedDriver);
91 Connection db = DriverManager.getConnection("jdbc:"+expandedDriver+"://"+expandedHost
92 +":"+expandedPort+"/"+expandedDatabase
93 , expandedUsername, expandedPassword);
95 Statement st = db.createStatement();
96 ResultSet rs = st.executeQuery(expandedQuery);
97 ResultSetMetaData rsmd = rs.getMetaData();
98 int numberOfColumns= rsmd.getColumnCount();
99 ArrayList fieldNames = new ArrayList(numberOfColumns);
100 for (int i=0;i<numberOfColumns;i++){
101 fieldNames.add(rsmd.getColumnName(i+1));
104 while(rs.next() && !isAborted(aValueMap)) {
105 HashMap result=new HashMap();
106 Iterator fields = fieldNames.iterator();
107 while (fields.hasNext()) {
108 String field=(String) fields.next();
109 result.put(field,rs.getString(field));
111 ParameterExpander.setValueForKey(aValueMap,expandedKey,result);
112 super.produce(aValueMap, aVerb, aLogger);
118 catch (Throwable t) {
119 Throwable s = ExceptionFunctions.traceCauseException(t);
120 aLogger.error("Error while accessing external database: " + s.getClass().getName()+","+ s.getMessage());