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href attribute of the anchor element is then retrieved and stored in the variable imgname; that is, the respective image file name (whether it is a1.jpg, a2.jpg, etc.) of the icon on which the mouse pointer is hovering will be stored in the imgname variable. With that done, the enlarged image (assigned to the img element of the class large) is made invisible slowly with the help of the .fadeTo() method. In the callback function of the .fadeTo() method (that is called when the animation effect is over), we set the value of the src attribute (image source value of the img element of the class large) equal to the value stored in the variable imgname. In other words, the image file name stored in the variable imgname (on which the mouse pointer is hovering) is assigned to the img element of the class large to display the enlarged view of the icon. The second fadeTo() method makes the enlarged view of the image appear gradually on the screen. The second function of the hover event, which is invoked when the mouse pointer moves away from the icon, is used for removing the hover class from the image and paragraph element to make them appear as they were before the mouse pointer moved over them. On execution of the jQuery code, if we take the mouse pointer on the first icon, its background and foreground color change and its enlarged view is displayed, as shown in Figure 6-21.

Among JDBC objects, creating a Connection object (javasqlConnection) to the database server is expensive It is even more expensive if the database server is located on a remote machine A database application can easily spend several seconds every time it needs to establish a connection Connection pooling is a technique used for sharing server resources (such as connections) among requesting clients Each time a resource (such as a Statement or PreparedStatement object) attempts to access a database, it must connect to that database And to connect to a database, you need a database Connection object (that is, a javasqlConnection object) A database connection incurs overhead it requires resources to create the connection, maintain it, and then release it when it is no longer required The overhead is high for Web-based database applications, because Web users connect and disconnect more frequently.

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In addition, Web user interactions are typically shorter than other applications because of the surfing nature of Internet users In a nutshell, a connection pool is a set of available connections that can be reused It is the container (that can be represented as a Java object) of a finite set of Connection objects in which a defined amount of active database connections are waiting to be used and reused; when a client needs a database connection, it checks out a connection from a pool and then uses it (to do something useful such as querying a table), and then the client checks in the Connection object to the pool (after using the connection) All this takes place without physically opening or closing a connection on the database server, which alone will boost your database application s performance.

The sorting of numerical values is done in a different way from sorting strings in jQuery. We again make an HTML file with two heading elements and two paragraphs elements, as shown here: <body> <h3>Original numerical array is </h3> <p class="allmem"></p>

In a nutshell, a servlet is a web component that generates dynamic content. Servlets are small, platform-independent Java classes compiled to an architecture-neutral bytecode that can be

A connection pool contains a finite number of open database connections with a minimum and maximum number of connections (you need a maximum, because some databases limit the number of active connections), which means the connection pool has open connections between minimum and maximum numbers that you specify The pool expands and shrinks between the minimum and maximum sizes depending on the incremental capacity You need to give minimum, maximum, and incremental sizes (which is called a grow amount) as properties to the pool in order to maintain this functionality You get the connection from the pool rather than directly from the database For example, you can set up your connection pool using the following properties: JDBC driver: oraclejdbcdriverOracleDriver Database URL: jdbc:oracle:thin:@myserver:1521:maui Database user: mp User s password: mp2 Minimum: 6 Maximum: 30 Grow amount: 3.

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