Simple .NET/ASP.NET PDF document editor web control SDK

Creating rich functionality using ASP NET requires much less code than it does using ASP and other web development environments You realize a large portion of this savings through the state maintenance the Framework provides This accounts for, among other things, a drop-down list s capability to maintain the entries in the list across postbacks, all HTML input controls being able to maintain their values across postbacks, and, in more advanced cases, the capability of the DataGrid to maintain its entire HTML table when one of its events causes a postback The magic of ViewState is accomplished with the aid of a hidden input named __VIEWSTATE <input type="hidden" name="__VIEWSTATE" id="__VIEWSTATE" value="/wEPDwUJNzgzNDMwNTMzZGTp0BWhvZM7mmZGfhpcnI4aNOFFbw==" /> All controls on a page can put whatever values they want into this hidden input The Framework manages these values, basically as a collection of named value pairs.

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Figure 14-4. JDBC standard and Oracle-specific connection caching related classes and interfaces Oracle provides you with the following classes and interfaces in the oracle.jdbc.pool package that implement connection cache functionality for you. In Oracle9i, you can use this implementation, or you can code your own using some or all of these classes and interfaces. In Oracle 10g, these classes have been deprecated and you should use the implicit connection caching. OracleConnectionCache: An interface you need to implement if you want to implement your own version of connection caching OracleConnectionCacheImpl: A class that implements the OracleConnectionCache interface OracleConnectionEventListener: A connection event listener class

The SetLastError parameter informs the runtime that the called function uses the Windows mechanism for error reporting and that the GetLastError function can be read in case of error; otherwise, the CLR ignores such a value The CharSet parameter indicates the character set assumed, and it is used to distinguish between ANSI and Unicode characters; with Auto, you delegate the runtime to decide the appropriate version You can define the generic class MemMap that uses the functions to map a given file into memory The goal of the class is to provide access to memory mapping in a system where memory is not directly accessible because the runtime is responsible for its management A natural programming abstraction to expose the memory to F# code is to provide an array-like interface where the memory is seen as a homogeneous array of values Listing 17-1.

As shown in Figure 14-4, the OracleConnectionCacheImpl class implements the Oracle ConnectionCache interface and extends OracleDataSource. It employs OracleConnection EventListener class instances for connection events pertaining to cache management scenarios, such as when the application closes the logical connection.

Exposing Memory Mapping in F# #light module MMap =.

The Framework also manages delimiting values put into ViewState through different controls on the page It also manages encrypting and decrypting the values before they go to the client and when they re posted back to the server This means that the Framework provides a complete layer of abstraction between the consumer of ViewState and the details of its actual implementation This makes using ViewState very easy from custom controls or from the code for a Web Form Let s start by examining how one of the built-in Web Controls uses ViewState We ll take a look at the DropDownList control It maintains the entries in its list across postbacks using ViewState For each list item that s in the collection of list item objects, the display name, its underlying value, and whether or not it s visible is added to ViewState.

The following steps occur during a typical interaction of a JDBC application and a middle-tier connection cache. The Oracle implementation is used in our examples. 1. The middle tier creates an instance of a connection cache class with its own data source properties that define the physical connections it will cache. 2. The middle tier may optionally bind this instance to a JNDI source. 3. The JDBC application retrieves a connection cache instance (instead of a generic data source) from the middle tier either by using a JNDI lookup or through a vendorspecific API. 4. The JDBC application retrieves the connection from the connection cache through its getConnection() method. This results in a logical connection being returned to the JDBC application. 5. JDBC uses JavaBeans-style events to keep track of when a physical connection (pooled connection instance) can be returned to the cache or when it should be closed due to a fatal error. When the JDBC application is done using the connection, it invokes the close() method on the connection. This triggers a connection-closed event and informs the pooled connection instance that its physical connection can be reused.