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

But hopefully this is a nonissue, because you should not use plain Statement objects for executing DML statements in production code anyway, for the numerous reasons covered in 5 Assuming that implicit caching is enabled, when you prepare a PreparedStatement or CallableStatement object, the JDBC driver automatically searches the cache for the statement and gets a hit in the cache if the following are true: The statement type is the same (prepared or callable) The SQL string in the statement is identical (case sensitive) to the one in the cache The scrollable type of result set produced by the statement is the same (forward-only or scrollable) You can determine the scrollability of the prepared or callable statement as explained in the 7 If a match is found, the cached statement is returned and the rest of the code proceeds as usual.

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end of its execution by popping the record out of the stack. The stack data structure is used to implement the automatic memory of the program, and since different threads execute different functions at the same time, a separate stack is assigned to each of them.

This is the first event to fire after the control tree and ViewState of the page have been created and restored. Generally you use this event for page initialization, wrapping your code in a clause that causes it not to fire on postbacks, as postback logic usually lives in an event handler of a specific control. This event occurs just before the page does a recursive descent of its control tree and calls the render method to assemble to output stream. More on this event later. This event fires after the output stream has been rendered and sent back to IIS. You cannot modify the output stream from this event. The only thing to be done from this event is to clean up any resources you ve held onto over the lifetime of the Page object instance.

If no match is found, a new statement is created and returned When you call the close() method of the statement, the new statement created along with its cursor and state is cached in the implicit statement cache Enabling and Disabling Implicit Statement Caching You can enable or disable implicit statement caching by invoking appropriate methods on either the OracleConnection object or the OracleDataSource object from which the Connection object is obtained To enable implicit statement caching on the OracleConnection object, you need to perform the following steps:.

Figure 17-2 Memory organization of a running CLR program Dynamic memory is allocated in the heap, which is a data structure where data resides for an amount of time not directly related to the events of program execution The memory is explicitly allocated by the program, and it is deallocated either explicitly or automatically depending on the strategy adopted by the run time to manage the heap In the CLR, the heap is managed by a garbage collector, which is a program that tracks memory usage and reclaims memory that is no longer used by the program Data in the heap is always referenced from the stack or other known areas such as static memory either directly or indirectly The garbage collector can deduce the memory potentially reachable by program execution in the future, and the remaining memory can be collected.

1. Use the Oracle extension method setImplicitCachingEnabled( boolean flag) as follows: conn.setImplicitCachingEnabled( true ); 2. Set the cache size (remember, the same cache is shared by implicit and explicit caching) by using the Oracle extension method setStatementCacheSize( int size) on the connection object as follows: conn.setStatementCacheSize( 10 ); To enable implicit statement caching on the OracleDataSource object, you need to perform the following steps: 1. Invoke OracleDataSource.getConnection() with the ImplicitCachingEnabled property set to true, or set ImplicitCachingEnabled on the OracleDataSource by calling Oracle DataSource.setImplicitCachingEnabled(true) as follows (assume ods is an initialized variable of type OracleDataSource): ods.setImplicitCachingEnabled( true ); 2. Set the cache size by invoking OracleDataSource.setMaxStatements( int maxNumber OfStatements) as follows (assume ods is an initialized variable of type OracleDataSource): ods.setMaxStatements( 10 );

Note The Page object has some new events in version 2.0 that we ll look at a bit later. Table 3-1 displays

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