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protected override void PreFilterProperties(IDictionary properties) { base.PreFilterProperties(properties); // Add a new property. properties["AllowDesignTimeScroll"] = TypeDescriptor.CreateProperty( typeof(MarqueeLabelDesigner), "AllowDesignTimeScroll", typeof(bool), CategoryAttribute.Design, DesignOnlyAttribute.Yes); }

You ll notice on your own inspection of the class definition that THD houses all the functions and variables you would expect to find to maintain the state of a user connection and the statement being executed on that connection We ll take a more in-depth look at the different parts of the THD class as we look further into how the different subsystems make use of this base class throughout this chapter The create_new_thread() function found in /sql/mysqldcc spawns a new thread and creates a new user thread object (THD) for each incoming connection8 This function is called by the managing thread created by the server process to handle all incoming user connections For each new thread, two global counters are incremented: one for the total number of threads created and one for the number of open threads.

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The various managed and unmanaged providers used to connect to an Oracle database and how they differ architecturally and in terms of performance

Note As a general rule, always call the base method first in the PreFilterXxx() methods and last in the

In this way, the server keeps track of the number of user connections created since the server started and the number of user connections that are currently open Again, in our examination of a typical query execution at the end of this chapter, you ll see the actual source code that handles this user thread-spawning process..

PostFilterXxx() methods. This way, all designer classes are given the proper opportunity to apply their changes. The ControlDesigner and ComponentDesigner use these methods to add properties like Visible, Enabled, Name, and Locked.

If you re one of those moving from Microsoft SQL Server to Oracle, you re probably curious about what their differences are and what those would mean to you as a NET developer Although there are still some major feature differences between the latest versions of these two databases, the recently released Microsoft SQL Server 2008 has been a large step toward achieving the range of functionality available in Oracle 11g For instance, Microsoft has introduced Transparent Data Encryption (a technology that encrypts the database without requiring any additional code to be written) with SQL Server 2008, a feature that also exists in Oracle 11g The biggest change in moving to Oracle would be the SQL dialect that is used to query the database Oracle uses its own dialect called PL/SQL, and at times, that can be drastically different from T-SQL in SQL Server.

When you recompile your code, the AllowDesignTimeScroll property will appear in the design-time window. If you set it to true, the label will begin scrolling in the design-time environment.

The storage engine abstraction subsystem enables MySQL to use different handlers of the table data within the system architecture. Each storage engine implements the handler superclass defined in /sql/handler.h. This file indicates the standard API that the query parsing and execution subsystem will call when it needs to store or retrieve data from the engine.

Another trick you might want to use with filtering is to shadow a member. Shadowing a member is a technique in which you replace a control property with a duplicate control-designer property that has the same name. This allows your designer to intercept when the property is set, and decide whether it should pass a value to the underlying control at design time. This technique ensures that properties like Visible or Enabled don t have any effect at design time.

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