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Connecting to a database is performed on a per-client basis That is, each client must open its own connection to a database, and the connection cannot be shared with unrelated clients For example, a client that needs to interact frequently with a database must either open a connection and leave the connection open during processing, or open or close and reconnect each time the client needs to access the database Leaving a connection open might prevent another client from accessing the database should the DBMS have a limited number of connections available Connecting and reconnecting is simply time consuming and causes performance degradation The release of the JDBC 21 Standard Extension API introduced connection pooling to address the problem A connection pool is a collection of database connections that are opened once and loaded into memory so these connections can be reused without having to reconnect to the DBMS Clients use the DataSource interface to interact with the connection pool The connection pool itself is implemented by the application server and other J2EE-specific technologies, which hide details on how the connection pool is maintained from the client There are two types of connections made to the database The first is the physical connection, which is made by the application server using PooledConnection objects PooledConnection objects are cached and reused The other type of connection is the logical connection A logical connection is made by a client calling the DataSourcegetConnection() method, which connects to a PooledConnection object that has already made a physical connection to the database Listing 10-8 illustrates how to access a connection from a connection pool A connection pool is accessible by using the Java Naming and Directory Interface (JNDI) JNDI provides a uniform way to find and access naming and directory services independent of any specific naming or directory service First, a J2ME application must obtain a handle to the JNDI context, which is illustrated in the first statement in this code segment Next, the JNDI lookup() method is called and is passed the name of the connection pool, which returns the DataSource object, called pool in this example The getConnection() method of the DataSource object is then called, as illustrated earlier in this chapter The getConnection() returns the logical connection to the database, which is used by the J2ME application to access the database The close() method of the DataSource object is called once when the J2ME application is finished accessing the database The close() method closes the logical connection to. vb.net pdf 417 reader VB . NET Image: How to Decode and Scan 2D PDF - 417 Barcode on Image ...
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NET PDF - 417 Barcode Reader , Reading PDF - 417 barcode images in .NET, C# , VB . NET , ASP.NET applications. In this version, Date is fully-qualified As shown in Table 9-1, when a package is imported, only those items within the package declared as public will be available to non-subclasses in the importing code For example, if you want the Balance class of the package MyPack shown earlier to be available as a stand-alone class for general use outside of MyPack, then you will need to declare it as public and put it into its own file, as shown here: package MyPack; /* Now, the Balance class, its constructor, and its show() method are public This means that they can be used by non-subclass code outside their package */ public class Balance { birt ean 13, how to install code 128 barcode font in word, birt upc-a, print ean 13 barcode word, birt pdf 417, birt code 128 vb.net pdf 417 reader Packages matching PDF417 - NuGet Gallery
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This page tells how to use VB . NET PDF 417 Barcode Scanner Library to read PDF - 417 in .NET, VB . NET , C# , ASP.NET projects. import MyPack*; class TestBalance { public static void main(String args[]) { /* Because Balance is public, you may use Balance class and call its constructor */ Balance test = new Balance("J J Jaspers", 9988); testshow(); // you may also call show() } } Listing 10-8 Connecting to a database using a connection pool Context ctext = new InitialContext(); DataSource pool = (DataSource) ctextlookup("java:comp/env/jdbc/pool"); Connection db = poolgetConnection(); // Place code to interact with the database here dbclose(); As an experiment, remove the public specifier from the Balance class and then try compiling TestBalance As explained, errors will result Networks allow computers to share information, messages, and software Dial-up, broadband, and wireless are three types of network connections Using the keyword interface, you can fully abstract a class interface from its implementation That is, using interface, you can specify what a class must do, but not how it does it Interfaces are syntactically similar to classes, but they lack instance variables, and their methods are declared without any body In practice, this means that you can define interfaces that don t make assumptions about how they are implemented Once it is defined, any number of classes can implement an interface Also, one class can implement any number of interfaces To implement an interface, a class must create the complete set of methods defined by the interface However, each class is free to determine the details of its own implementation By providing the interface keyword, Java allows you to fully utilize the one interface, multiple methods aspect of polymorphism Once a connection to the database is opened, the J2ME application creates and sends a query to access data contained in the database The query is written using SQL, which you ll learn about in the next chapter One of three types of Statement objects is used to execute the query These objects are Statement, which executes a query immediately; PreparedStatement, which is used to execute a compiled query; and CallableStatement, which is used to execute store procedures 9: List facts about the three types of network connections Use a table like the one below (also available online) vb.net pdf 417 reader .NET PDF - 417 Barcode Reader for C# , VB . NET , ASP.NET ...
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