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Even in its simplest form, there are still many tiny SQL differences to watch out for when writing SQL statements and stored procedures on Oracle For instance, Oracle uses the double quotation mark to handle whitespace in table column names while SQL Server uses the square brackets Listing 1-1 shows the difference The PL/SQL language itself would fill up an entire book on its own and will not be covered in this book To maximize your usage of ODPNET, it is recommended to at least familiarize yourself with the basics of PL/SQL Listing 1-1 SQL Syntax Difference Between SQL Server and Oracle SQL SERVER SELECT [Full Price] FROM [Global Products] ORACLE SELECT "Full Price" FROM "Global Products" Another difference to note is that Oracle provides numerous advanced data types and cursors that can boost query performances if used correctly.

8. This is slightly simplified, as there is a process that checks to see if an existing thread can be reused (pooling).

Note Another way to achieve this result is to explicitly check the DesignMode attribute in your control code. However, the shadowing approach is preferable. Not only does it enforce better separation between the design-time and runtime logic of your control, it also prevents the control code from becoming unnecessarily tangled with conditional statements.

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For instance, Oracle provides the LOB data types that perform faster than the standard LONG data types used for storing large objects We will cover more ground on accessing these data types via ODPNET in the later chapters of this book There are, of course, many other differences between these two databases from a database administrator s point of view, but we will only account for the major differences that affect NET development This list is briefly summarized in Table 1-1 Table 1-1 Major Differences Between Oracle and SQL Server.

Not all storage engines implement the entire handler API; some implement only a small fraction of it. Much of the bulk of each handler s implementation details is concerned with converting data, schema, and index information into the format needed by MySQL s internal record format (in-memory record format).

To see a shadowed member at work, it s worth considering a more realistic version of the MarqueeLabel control. A more typical design would add a property to MarqueeLabel that determines whether scrolling should be performed. This allows the application to stop and start the label at will:

public bool EnableScrolling { get { return tmrScroll.Enabled; } set { tmrScroll.Enabled = value; } } In this case, the developer will probably want to be able to set the EnableScrolling property at design time. However, you still want to prevent the label from scrolling until the application is launched. You can solve this by shadowing the property. Here s the duplicate EnableScrolling property that you need to add to the control designer: public bool EnableScrolling { get { return (bool)ShadowProperties["EnableScrolling"]; } set { ShadowProperties["EnableScrolling"] = value; } } Notice that the value for the EnableScrolling property isn t stored in a member variable. Instead, the ControlDesigner class provides a collection named ShadowProperties that you can use for this purpose. When the control designer is first created, you need to make sure its EnableScrolling property is set to match the underlying control. At the same time, you should switch off scrolling, no matter what the property value is. To do this, you need to override the Initialize() method. The Initialize() method is called before any other tasks happen with the designer. public override void Initialize(IComponent c) { base.Initialize(c); // Shadow the EnableScrolling property. EnableScrolling = ((MarqueeLabel)Control).EnableScrolling; // Now turn off scrolling in the underlying control. ((MarqueeLabel)Control).EnableScrolling = false; } The last step is to use the PreFilterProperties() method to replace the MarqueeLabel. EnableScrolling property with the shadowed MarqueeLabelDesigner.EnableScrolling property: protected override void PreFilterProperties(IDictionary properties) { base.PreFilterProperties(properties); properties["EnableScrolling"] = TypeDescriptor.CreateProperty( typeof(MarqueeLabelDesigner), (PropertyDescriptor)properties["EnableScrolling"], new Attribute[0]); }

Note For more information about the internal format for record storage, see the internals.texi document included with the MySQL internal system documentation, in the Docs directory of the source tree.

Supports most known platforms including Supports only Windows-based platforms Windows-based platforms and AIX-based and HP-UX based systems Provides the PL/SQL language, which is more Provides the T-SQL language powerful than T-SQL. For example, PL/SQL

This completes the example. You might expect that you need to add more code to copy the value of the shadowed property from the designer back to the control. However, this isn t the case. That s because a shadowed version of the EnableScrolling property doesn t have the design-time-only flag. As a result, when the developer sets this property in the Properties window, Visual Studio generates the code and adds it to the InitializeComponent() method: marqueeLabel1.EnableScrolling = true; At runtime, the control designer no longer exists, and this statement acts directly on the control, switching on scrolling.

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