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Then you add some more instrumentation, so you could see what error numbers are encountered during the transaction: print 'INSERT error number:' + cast(@inserr as nvarchar(8)) print 'DELETE error number:' + cast(@delerr as nvarchar(8)) return @maxerr Now let s look at what happens when you execute the stored procedure. You run it twice, first by adding customer a and next by adding customer aa , but you also enter the same nonexistent customer to delete each time. If all statements in a transaction are supposed to succeed or fail as one unit, why does the INSERT succeed when the DELETE doesn t delete anything Figure 8-2 should make everything clear. Both the INSERT and DELETE return error number zero. The reason DELETE returns error number zero even though it has not deleted any rows is that when a DELETE doesn t find any rows to delete, T-SQL doesn t treat that as an error. In fact, that s why you use a nonexistent customer. The rest of the customers (well, all but the two you have just added) have child orders, and you can t delete these existing customers unless you delete their orders first.

return providers[providerIndex]; }

s Note A data view is a dynamic representation of the contents of a data table. Like a SQL view, it doesn t

public DirectoryProvider< >[] getDirectoryProvidersForDeletion( Class< > entity, Serializable id, String idInString) { return providers; Providers where the }

In this example, you ll try to insert a duplicate customer and delete an existing customer. Add customer a and delete customer aa by entering the following statement, and then click the Execute button: exec sp_Trans_Test 'a', 'a ', 'aa '

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Try It Out: Refining Data with a Data View We won t cover all aspects of data views here, as they re beyond the scope of this book. However, to show how they can be used, we ll present a short example that uses a data view to dynamically sort and filter an underlying data table. 1. Add a new Console Application project named DataViews to your 08 solution. 2. Replace the code in Module1.vb with the code in Listing 8-3.

B Assign a functional subset of the data per shard. C This is the fully qualified class name of the IndexShardingStrategy implementation. D Assign one distributor id to a shard id. You can use the property-naming scheme of your choice. E The initialize

method is provided a list of ordered DirectoryProviders (one per shard). (F Properties can be read. A property name is composed of only its suffix (that is, it excludes hibernate.search.index_name.shard_nbr.). You can access all property names through the Properties API. G The Properties API is neither the most intuitive nor the most type-safe. Be sure to use defensive code. H You must return the list of providers on which queries (or the optimize operations) are run, usually the full list of providers. I Documents can be used as a payload to pass the discriminator value (in our case the distributor id). J Return the DirectoryProvider the document will be added to. 1) Return the list of providers an entity deletion will be applied to, generally all the providers because the strategy usually doesn t have enough information to restrict the list further. When Hibernate Search indexes an object, it lets the strategy determine which directory provider to use (see figure 9.2). In our case, this choice is driven by configuration. Make sure you embed in the document the field or fields on which you want to base your shard strategy. Unfortunately, Hibernate Search cannot pass around the entity instance; that would prevent Hibernate Search from playing nicely in a clustered environment, as we will show in chapter 10. This isn t a problem, because the Document instance will help you carry on the information. The delete operation is applied to all DirectoryProviders returned by the getDirectoryProvidersForDeletion() method. A safe implementation returns all shards (because of the lack of knowledge). But if your implementation knows where a given object is indexed, it s preferable to return the specific directory provider (or a subset of directory providers) to speed up the delete operation (see figure 9.3).

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