/*
* The Apache Software License, Version 1.1
*
* Copyright (c) 1999 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution, if
* any, must include the following acknowlegement:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowlegement may appear in the software itself,
* if and wherever such third-party acknowlegements normally appear.
*
* 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
* Foundation" must not be used to endorse or promote products derived
* from this software without prior written permission. For written
* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache"
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*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
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*
*/
package org.apache.commons.jelly.tags.sql;
import java.sql.*;
import java.util.*;
import javax.sql.DataSource;
import javax.naming.InitialContext;
import javax.naming.Context;
import javax.naming.NamingException;
import org.apache.commons.jelly.JellyContext;
import org.apache.commons.jelly.JellyException;
import org.apache.commons.jelly.TagSupport;
import org.apache.commons.jelly.XMLOutput;
import org.apache.commons.jelly.tags.Resources;
/**
* <p>Tag handler for <Update> in JSTL.
*
* @author Hans Bergsten
* @author Justyna Horwat
*/
public class UpdateTag extends SqlTagSupport {
/*
* Instance variables that are not for attributes
*/
private Connection conn;
//*********************************************************************
// Constructor and initialization
public UpdateTag() {
}
//*********************************************************************
// Tag logic
/**
* <p>Execute the SQL statement, set either through the <code>sql</code>
* attribute or as the body, and save the result as a variable
* named by the <code>var</code> attribute in the scope specified
* by the <code>scope</code> attribute, as an object that implements
* the Result interface.
*
* <p>The connection used to execute the statement comes either
* from the <code>DataSource</code> specified by the
* <code>dataSource</code> attribute, provided by a parent action
* element, or is retrieved from a JSP scope attribute
* named <code>javax.servlet.jsp.jstl.sql.dataSource</code>.
*/
public void doTag(XMLOutput output) throws Exception {
try {
conn = getConnection();
}
catch (SQLException e) {
throw new JellyException(sql + ": " + e.getMessage(), e);
}
/*
* Use the SQL statement specified by the sql attribute, if any,
* otherwise use the body as the statement.
*/
String sqlStatement = null;
if (sql != null) {
sqlStatement = sql;
}
else {
sqlStatement = getBodyText();
}
if (sqlStatement == null || sqlStatement.trim().length() == 0) {
throw new JellyException(Resources.getMessage("SQL_NO_STATEMENT"));
}
int result = 0;
try {
if ( hasParameters() ) {
PreparedStatement ps = conn.prepareStatement(sqlStatement);
setParameters(ps);
result = ps.executeUpdate();
}
else {
Statement statement = conn.createStatement();
result = statement.executeUpdate(sqlStatement);
}
if (var != null) {
context.setVariable(var, new Integer(result));
}
}
catch (SQLException e) {
throw new JellyException(sqlStatement + ": " + e.getMessage(), e);
}
finally {
if (conn != null && !isPartOfTransaction) {
try {
conn.close();
}
catch (SQLException e) {
// Not much we can do
}
}
clearParameters();
}
}
}