- /*
- * $Header: /home/cvs/jakarta-commons/dbutils/src/java/org/apache/commons/dbutils/DbUtils.java,v 1.2 2003/11/03 00:22:57 dgraham Exp $
- * $Revision: 1.2 $
- * $Date: 2003/11/03 00:22:57 $
- *
- * ====================================================================
- *
- * The Apache Software License, Version 1.1
- *
- * Copyright (c) 2002-2003 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 acknowledgement:
- * "This product includes software developed by the
- * Apache Software Foundation (http://www.apache.org/)."
- * Alternately, this acknowledgement may appear in the software itself,
- * if and wherever such third-party acknowledgements normally appear.
- *
- * 4. The names "The Jakarta Project", "Commons", 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"
- * nor may "Apache" appear in their names without prior written
- * permission of the Apache Software Foundation.
- *
- * 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
- * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
- * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
- * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
- * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- * ====================================================================
- *
- * 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
- * <http://www.apache.org/>.
- *
- */
-
- package org.apache.commons.dbutils;
-
- import java.io.PrintWriter;
- import java.sql.Connection;
- import java.sql.ResultSet;
- import java.sql.SQLException;
- import java.sql.Statement;
-
- /**
- * A collection of JDBC helper methods. This class is thread safe.
- *
- * @author Henri Yandell
- * @author Juozas Baliuka
- * @author Steven Caswell
- * @author David Graham
- */
- public final class DbUtils {
-
- /**
- * Close a <code>Connection</code>, avoid closing if null.
- */
- public static void close(Connection conn) throws SQLException {
- if (conn != null) {
- conn.close();
- }
- }
-
- /**
- * Close a <code>ResultSet</code>, avoid closing if null.
- */
- public static void close(ResultSet rs) throws SQLException {
- if (rs != null) {
- rs.close();
- }
- }
-
- /**
- * Close a <code>Statement</code>, avoid closing if null.
- */
- public static void close(Statement stmt) throws SQLException {
- if (stmt != null) {
- stmt.close();
- }
- }
-
- /**
- * Close a <code>Connection</code>, avoid closing if null and hide
- * any SQLExceptions that occur.
- */
- public static void closeQuietly(Connection conn) {
- try {
- close(conn);
- } catch (SQLException sqle) {
- // quiet
- }
- }
-
- /**
- * Close a <code>Connection</code>, <code>Statement</code> and
- * <code>ResultSet</code>. Avoid closing if null and hide any
- * SQLExceptions that occur.
- */
- public static void closeQuietly(
- Connection conn,
- Statement stmt,
- ResultSet rs) {
-
- closeQuietly(rs);
- closeQuietly(stmt);
- closeQuietly(conn);
- }
-
- /**
- * Close a <code>ResultSet</code>, avoid closing if null and hide
- * any SQLExceptions that occur.
- */
- public static void closeQuietly(ResultSet rs) {
- try {
- close(rs);
- } catch (SQLException sqle) {
- // quiet
- }
- }
-
- /**
- * Close a <code>Statement</code>, avoid closing if null and hide
- * any SQLExceptions that occur.
- */
- public static void closeQuietly(Statement stmt) {
- try {
- close(stmt);
- } catch (SQLException sqle) {
- // quiet
- }
- }
-
- /**
- * Commits a <code>Connection</code> then closes it, avoid closing if null.
- */
- public static void commitAndClose(Connection conn) throws SQLException {
- if (conn != null) {
- conn.commit();
- conn.close();
- }
- }
-
- /**
- * Commits a <code>Connection</code> then closes it, avoid closing if null
- * and hide any SQLExceptions that occur.
- */
- public static void commitAndCloseQuietly(Connection conn) {
- try {
- commitAndClose(conn);
- } catch (SQLException sqle) {
- // quiet
- }
- }
-
- /**
- * Loads and registers a database driver class.
- * If this succeeds, it returns true, else it returns false.
- */
- public static boolean loadDriver(String driverClassName) {
- try {
- Class.forName(driverClassName).newInstance();
- return true;
-
- } catch (ClassNotFoundException e) {
- // TODO Logging?
- //e.printStackTrace();
- return false;
-
- } catch (IllegalAccessException e) {
- // TODO Logging?
- //e.printStackTrace();
-
- // Constructor is private, OK for DriverManager contract
- return true;
-
- } catch (InstantiationException e) {
- // TODO Logging?
- //e.printStackTrace();
- return false;
-
- } catch (Throwable t) {
- return false;
- }
- }
-
- public static void printStackTrace(SQLException sqle) {
- printStackTrace(sqle, new PrintWriter(System.err));
- }
-
- public static void printStackTrace(SQLException sqle, PrintWriter pw) {
-
- SQLException next = sqle;
- while (next != null) {
- next.printStackTrace(pw);
- next = next.getNextException();
- if (next != null) {
- pw.println("Next SQLException:");
- }
- }
- }
-
- public static void printWarnings(Connection connection) {
- printWarnings(connection, new PrintWriter(System.err));
- }
-
- public static void printWarnings(Connection conn, PrintWriter pw) {
- if (conn != null) {
- try {
- printStackTrace(conn.getWarnings(), pw);
- } catch (SQLException sqle) {
- printStackTrace(sqle, pw);
- }
- }
- }
-
- /**
- * Rollback any changes made on the given connection.
- * @param conn The database Connection to rollback. A null value is legal.
- * @throws SQLException
- */
- public static void rollback(Connection conn) throws SQLException {
- if (conn != null) {
- conn.rollback();
- }
- }
-
- }