.NET/Java PDF, Tiff, Barcode SDK Library

IL_0031: ldnull IL_0032: stsfld class [fslib]Microsoft.FSharp.Core.Unit '<StartupCode>'.Hw::_doval@11@11 IL_0037: ret } // end of method Hw::_main The ldxxx instructions are used to load values onto the operand s stack of the abstract machine, and the stxxx instructions store values from that stack in locations (locals, arguments, or class fields). In this example, variables are declared as top level, and the compiler introduces static fields into the Hw class. The first assignment requires the value 2 to be loaded onto the stack using the ldc instruction, and the stfld instruction stores the value in the static variable that represents i in the compiled program. For method invocations, arguments are loaded on the stack, and a call operation is used to invoke the method. The JIT compiler is responsible for generating the binary code that will run on the actual processor. The code generated by the JIT interacts with all the elements of the runtime, including external code loaded dynamically in the form of DLLs or COM components.

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A statement cache is associated with a particular connection (i.e., each distinct physical connection to the database) has its own statement cache. For a simple connection, statement caching is associated with the OracleConnection object. For a pooled connection, it is associated with the OraclePooledConnection object (you ll learn about pooled connections in 14). Recall that the PL/SQL cursor cache does the actual caching of the cursor when you do an implicit or explicit close on a statement. In the same way, when statement caching is enabled, the JDBC driver caches a statement when the statement is closed. The next iteration picks the statement from the cache, thus avoiding the soft parse that would have otherwise been incurred in preparing the same statement again.

This event occurs when the server control is initialized, which is the first step in its life cycle..

Since the F# compiler targets the CLR, its output will be managed code, allowing compiled programs to interact directly with other programming languages targeting the .NET platform. We already showed how to exploit this form of interoperability in 10, when we showed how to develop a graphic control in F# and use it in a C# application.

Oracle JDBC drivers provide you with two different flavors of statement caching: implicit and explicit. Each type of statement cache can be enabled or disabled independently, which means that you can have either, neither, or both in effect simultaneously. It is important to remember that both statement-caching types share the same cache. This information is relevant when you set the size of the statement cache.

When you enable implicit statement caching, JDBC transparently caches the prepared or callable statement when you call the close() method of a statement object Behind the scenes, the prepared and callable statements are cached and retrieved using the standard connection object and statement object methods The beauty of implicit caching is that only the isolated piece of code that retrieves the connection for an application needs to change to enable it The bulk of the code that actually prepares and executes the statements remains the same Note that plain Statement objects are not cached in an implicit cache because implicit statement caching uses the SQL statement string as a key, and plain statements are by definition created without a SQL string, as follows: Statement stmt = conncreateStatement(); Therefore, implicit statement caching applies only to the PreparedStatement and CallableStatement objects (which are created with a SQL string).

Interoperability of F# programs with unmanaged code requires an understanding of the structure of the most important elements of a programming language s runtime. In particular, you must consider how program memory is organized at run time. Memory used by a program is generally classified in three classes depending on the way it is handled: Static memory, allocated for the entire lifetime of the program Automatic memory, allocated and freed automatically when functions or methods are executed Dynamic memory, explicitly allocated by the program and freed explicitly or by an automatic program called the garbage collector As a rule of thumb, top-level variables and static fields belong to the first class, function arguments and local variables belong to the second class, and memory explicitly allocated using the new operator belongs to the last class. The code generated by the JIT compiler uses different data structures to manage memory and automatically interacts with the operating system to request and release memory during program execution. Each execution thread has a stack where local variables and arguments are allocated when a function or method is invoked (see Figure 17-2). A stack is used because it naturally follows the execution flow of method and function calls. The topmost record contains data about the currently executing function; below that is the record of the caller of the function, which sits on top of another record of its caller, and so on. These activation records are memory blocks used to hold the memory required during the execution of the function and are naturally freed at the

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