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This statement invokes the animator function, and the wrapper variable containing the block of images is passed to it that will be assigned to its parameter imgblock. In the animator function itself, the code animates the image block toward the bottom of the browser window and stops it at the height of 760px from the bottom of the browser window. Since 760px is the total height of the image block, the whole image block will disappear. The image block will scroll down slowly, as we have defined the duration of animation as 5000 milliseconds. In the callback function of the animate method (that is invoked when the animate method is over), we make use of the .css() method to make the image block appear at the distance of 760px from the bottom border of the browser window, making the whole block visible. After that the animator function is recursively called to invoke itself to make the image block again scroll down toward the bottom of the browser window, and the process is repeated. The part of the image block visible while scrolling may appear as in Figure 6-12.

Some JDBC objects (such as java.sql.Connection) are expensive. It might take up to two to three seconds to create these objects. If you have a lot of clients that are all interested in database services, you do not need to create a single connection per client and then close/discard it after usage. Instead, you can define a pool of connections and, when a client needs a connection, lend a connection to a client. When the client is done with that borrowed connection, the client simply returns the connection to the pool of connections. (Returning the Connection object to the pool is called a soft close.) This way you can improve your application s performance. To manage a pool of connections, you need a pool manager. A pool manager is a control structure (a class with some useful methods for checking in and checking out Connection objects) that manages Connection objects by requiring them to be checked in and out of a finite pool. The number of

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A JDBC application can get metadata information about the columns in a RowSet object (such as CachedRowSet or WebRowSet) by invoking ResultSetMetaData and RowSetMetaData methods on a RowSetMetaData object. The following code fragment, in which webRS is a WebRowSet object, illustrates the process. The first line creates a WebRowSet object. The second line creates a RowSetMetaData object with information about the columns in webRS. The method getMetaData(), inherited from the ResultSet interface, returns a ResultSetMetaData object, which is cast to a RowSetMetaData object before being assigned to the variable rsMD. The third line finds out how many columns rsMD has, and the fourth line gets the JDBC type of values stored in the second column of webRS.

The following utility method closes ResultSet, Statement, and Connection objects where Statement is derived from the Connection object and ResultSet is derived from the Statement object.

[_a-z0-9-]+ means that our email address can have _ (underscore), alphabets from a to z, numerical from 0 to 9 and a (hyphen) for 1 or more time (\.[_a-z0-9-]+)* means the email address can have a . (period) followed by _ (underscore), alphanumerical, - (hyphen) for 0 or more times @[a-z0-9-]+ means the email address must have @ symbol followed by alphanumerical and - (hyphen) for 1 or more times (\.[a-z]{2,3})$ means the email address must terminate with a . (period) and any alphabet from a to z which should be between 2 to 3 (in count) i.e. after the .(period) we cannot have less than 2 alphabet or more than 3 alphabet

This shows how to close ResultSet, Statement, and Connection objects and ignore exceptions: /** * Close ResultSet, Statement, and Connection objects. * @param rs a ResultSet object (derived from stmt object) * @param stmt a Statement object (derived from conn object) * @param conn a Connection object */ public static void closeQuietly(ResultSet rs, Statement stmt, Connection conn) { if (rs != null) { try {

WebRowSet webRS = <get-a-WebRowSet-object>; RowSetMetaData rsMD = (RowSetMetaData) webRS.getMetaData(); int columnCount = rsMD.getColumnCount(); int type = rsMD.getColumnType(2);

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