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We can see in the preceding jQuery code that a click event is attached to the image. In the eventhandling function of the click event, the animate method is used to make the image scroll to the left slowly (in the boundary of the window in which the image is enclosed) and stop at the distance of 160px from the left side of the window; that is, the image completely disappears. In the callback function of the animate method (which is invoked when the animate method is over; that is, when the image is completely invisible), we use the .css() method to make the image appear at the distance of 150px from the left side of the invisible window, making a small portion of the left edge of the image appear. In the same callback function, we again make use of the animate method to make the image scroll to the left and stop at the distance of 0px (from the left side of the invisible window); that is, the image will stop where it started. Initially, the image will appear as shown in Figure 6-7.

In general, you should close database connections after their usage. If you obtain a connection from a connection pool, then you must return it to the pool; otherwise, you have to properly close it. In the following sections, I will show you several solutions for closing a Connection object. The Connection.rollback() statement in SQL cancels the proposed changes in a pending database transaction. According to the JDK, Connection.rollback() undoes all changes made in the current transaction and releases any database locks currently held by this Connection object. You should use this method only when autocommit mode has been disabled.

This shows how to roll back and close a connection and not report exceptions: /** * Roll back and close a connection; avoid closing * if null, and hide any SQLExceptions that occur.

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Figure 6-7. Image on loading the web page And upon clicking the image, it will scroll to the left and will become invisible slowly, as shown in Figure 6-8.

Before you can create a RowSet object, you need to provide implementation classes for the RowSet interface, or you may use the reference implementations provided by Sun (http:// java.sun.com/products/jdbc/download.html#rowset1_0_1). To use Sun s reference implementations, you need to download the reference implementations of RowSet and include the rowset.jar file in your CLASSPATH environment variable. Sun s reference implementation provides the com.sun.rowset.WebRowSetImpl class, which implements the WebRowSet interface (the standard implementation of the WebRowSet interface).

* @param conn a java.sql.Connection object. */ public static void rollbackAndCloseQuietly(java.sql.Connection conn) { try { if(conn == null) { return; } if(conn.isClosed()) { return; } conn.rollback(); conn.close(); // hint the "garbage collector" conn = null; } catch(SQLException e) { // ignore } }

This shows how to roll back and close a connection and log exceptions: /** * Roll back and close a connection; avoid closing * if null, and hide any SQLExceptions that occur. * @param conn a java.sql.Connection object. * @param logger a Logger object is used to log messages. */ public static void rollbackAndCloseQuietly(java.sql.Connection conn, java.util.logging.Logger logger) { try { if(conn == null) { return; } if(conn.isClosed()) { return; } conn.rollback(); conn.close(); // hint the "garbage collector" conn = null; } catch(SQLException e) { // handle the exception and log it e.printStackTrace(); if (logger != null) { logger.warning("rollbackAndCloseQuietly: "+e.getMessage()); } } }

After the image completely disappears, it appears again at the right side of the window and scrolls left, as shown in Figure 6-9:

This shows how to roll back and close a connection and report exceptions: /** * Roll back and close a connection; avoid closing if null, and * report any SQLExceptions that occur. * @param conn a java.sql.Connection object. * @throws SQLException failed to roll back and close the connection */ public static void rollbackAndClose(java.sql.Connection conn) throws SQLException { try { if(conn == null) { return; } if(conn.isClosed()) { throw new SQLException("connection is closed."); } conne.rollback(); conn.close(); // hint the "garbage collector" conn = null; } catch(SQLException e) { e.printStackTrace(); throw e; } }

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