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These methods are primarily called at Design Time but as you will see in the case of Validate, for example, this doesn t preclude them from being called at runtime also. ProvideComponentProperties The ProvideComponentProperties method is called once when the component gets dropped onto the Data Flow. It s generally used for initializing the component, which might include setting the SynchronousInputID property on the component output collection to specify synchronicity, or creating a custom properties collection (IDTSCustomPropertyCollection90) and adding individual custom properties (IDTSCustomProperty90) that get exposed in the component configuration. In addition, outputs and inputs can be configured, and connections can be added and configured, via RuntimeConnectionCollection. Validate The Validate method is not only important but also incredibly useful, when configured correctly, in providing valuable feedback about configuration issues. Validate gets called a number of times during design time to ensure component configuration is viable and again at runtime as a final check. It s interesting to attach the Visual Studio debugger when creating a custom component and observe the execution of Validate by placing a breakpoint on the method. In fact, I ll come back to this point later on in the chapter when I get to the example. The Validate method is another example of the great object model designed by Microsoft. The base method performs general component validation, which leaves the developer to add implementation-specific validation to the overridden method. This might include checking that columns are defined as ReadOnly instead of ReadWrite, or that important properties are populated. Problems can then be reported back either by raising of exceptions or issuing warning messages.

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Mac OS X Server is all about collaboration, and until version 10.6 was released, it lacked a robust means of storing and sharing address and contact information. The Address Book service does nicely to fulfill this need, and although it may not yet be as robust as other options available, it suffices nicely for many environments. This chapter explained its features and limitations, so you can now deploy it with confidence.

ReinitializeMetaData The ReinitializeMetaData method is called when the Validate method returns VS_NEEDSNEWMETADATA, or when the user clicks the Refresh button It can be used to provide setup for any column-level configuration required by the component or to provide reconfiguration if problems have been detected MapInputColumn and MapOutputColumn MapInputColumn and MapOutputColumn can be used to create a mapping relationship between input/output columns and external metadata columns But what are external metadata columns To support working offline, external metadata columns can provide a representation of real output columns that can, at points, be inaccessible Use of external metadata columns is a nice-to-have feature rather than a concrete requirement I rarely use offline mode in SSIS, though I appreciate there are times when it is necessary InsertInput, DeleteInput, SetInputProperty, InsertOutput, DeleteOutput, and SetOutputProperty A number of methods support the manipulation of inputs and outputs in terms of their creation and deletion.

Requirements might stipulate the desire to disallow either add or delete operations, or the setting of custom properties InsertInput, DeleteInput, and SetInputProperty are the methods to override to provide custom input handling InsertOutput, DeleteOutput, and SetOutputProperty perform the same operations for outputs The example presented later in the chapter contains overrides of these methods that demonstrate how to use them in more detail SetOutputColumnDataTypeProperties and SetExternalMetadataColumnDataTypeProperties Because input-column data types are set upstream, no methods are available for changing them As you can imagine, however, you might need to update output-column data types, which are defined within the custom component For this reason, the object model provides two overridable methods SetOutputColumnDataTypeProperties is used to update output-column data types, and SetExternalMetadataColumnDataTypeProperties is used for external metadata columns.

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