ASP.NET PDF Viewer using C#, VB/NET

Disabling Implicit Caching for a Particular PreparedStatement or CallableStatement When implicit statement caching is enabled for a connection, by default all callable and prepared statements of that connection are automatically cached If you want to prevent a particular callable or prepared statement from being implicitly cached, use the Oracle extension method setDisableStatementCaching(), which is available in the interface OraclePreparedStatement (and also by extension in the interface OracleCallableStatement) This helps you disable caching on infrequently executed statements and manage the cache space better The following code disables implicit statement caching for an already initialized PreparedStatement object, pstmt: ((OraclePreparedStatement)pstmt)setDisableStmtCaching(true); Physically Closing an Implicitly Cached PreparedStatement or CallableStatement Recall that when you execute the close() method on an implicitly cached prepared or callable statement, the statement does not really get closed The physical closing of the statement is not in your hands when implicit caching is enabled.

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Component Object Model (COM) is a technology that Microsoft introduced in the 1990s to support interoperability among different programs possibly developed by different vendors The Object Linking and Embedding (OLE) technology that allows embedding arbitrary content in a Microsoft Word document, for instance, relies on this infrastructure COM is a binary standard that allows code written in different languages to interoperate, assuming that the programming language supports this infrastructure Most of the Windows operating system and its applications are based on COM components The CLR was initially conceived as an essential tool to develop COM components, being that COM was the key technology at the end of 1990s It is no surprise that the Microsoft implementation of CLR interoperates easily and efficiently with the COM infrastructure.

The Oracle JDBC driver physically closes the statement automatically under one of the following three conditions: When the associated connection is closed When the cache reaches its size limit and the least recently used statement object is pre-empted from the cache by the Least Recently Used (LRU) scheme If you call the close() method on a statement for which statement caching is disabled at the Statement level Implicit Statement Caching in Action It is time to demonstrate implicit caching in action We will do this by comparing the execution of a simple select statement in a for loop with implicit caching enabled and disabled.

In this section, we briefly review the main concepts of the COM infrastructure and its goals in order to show you how COM components can be consumed from F# (and vice versa) and how F# components can be exposed as COM components A COM component is a binary module with a well-defined interface that can be dynamically loaded at run time by a running program The COM design was influenced by CORBA and the Interface Definition Language (IDL) to describe a component as a set of interfaces In the case of COM, however, components are always loaded inside the process using the dynamic loading of DLLs Even when a component runs in a different process, a stub is loaded as a DLL, and it is responsible for interprocess communication.

If you ve ever written a Custom Control, you know that the critical piece of work that needs to be done is to override the Render method of the Control base class The Page starts by calling the Render method of the first control in its control tree That control renders (which is just a fancy way to say it generates some HTML based on its current state), and checks to see if it has any controls in its own ControlCollection If it does, it calls Render on the first of those, which is where you meet the recursion of your algorithm This is done for every control in every control collection in the entire tree.

We will also demonstrate the implicit caching at work for a CallableStatement object, which will invoke the simple function f() defined in the following code (notice that we tag the select again since we will use tkprof subsequently and we need to identify where the SQL came from): benchmark@ORA10G> create or replace function f return sys_refcursor 2 as 3 l_cursor sys_refcursor; 4 begin 5 open l_cursor for 6 select /*+ to be called using callable statement */ dummy from dual; 7 return l_cursor; 8 end; 9 / Function created..