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cess. The application receives the SqlRowsCopied event, which notifies it that a block of rows has been processed. You should note a couple of points. First, BatchSize and NotifyAfter are totally unrelated properties. Second, receipt of a SqlRowsCopied event doesn t necessarily imply that rows have been committed. If you close the bulk operation in the event handler using the Close method, an exception is thrown. If you want to abort the ongoing operation, set the Abort property of the SqlRowsCopiedEventArgs instead. You receive an instance of the class as the argument of the SqlRowsCopied event. Abort is a Boolean property; set it to true to abort the bulk copy. Each step of the bulk copy (the number of steps depends on the BatchSize property) runs in its own transaction that is automatically committed or rolled back as the batch terminates. If you choose to abort a bulk copy, nothing happens to the rows that have been processed in earlier batches they have already been committed. If you re running the bulk copy as a part of your own transaction, you are totally responsible for the commit or rollback of the entire operation. No automatic rollback or commit occurs on your transaction.
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The .NET data provider for SQL Server also has new features that are tied to the enhancements in SQL Server 2005 and its MDAC 9.0 libraries. To test the features briefly described in this section, you must have at least the Beta 1 of SQL Server 2005. SQL Server 2005 introduces significant enhancements in various areas, including data type support, query dependency and notification, and multiple active resultsets.
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In SQL Server, large values are stored using data types such as text, ntext, and image. SQL Server 2005 also lets you store large values in varchar, nvarchar, and varbinary columns. In fact, these data types can contain up to 2^31-1 bytes. This allows for a unified programming model for regular and large values. In ADO.NET 1.x and 2.0, you can use the GetChars and GetBytes methods on the SqlDataReader class to improve application performance (but only if you create the reader using the SequentialAccess command behavior). When you work sequentially, the data reader doesn t cache the currently selected record, but it lets you freely move the cursor. This lets you optimize your code when you re using large objects. However, you can t, for example, move back to the second field after you access the fourth field. This limitation doesn t exist in the default scenario because the entire record is cached.
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Support for CLR Types
The great news in SQL Server 2005 is that it supports any CLR types. In addition to default types, you can store into and retrieve from SQL Server tables any object that is a valid .NET type. This includes both system types such as a Point and user-defined classes. This extended set of capabilities is reflected in the ADO.NET 2.0 provider for SQL Server. CLR types appear as objects to the data reader, and parameters to commands can be instances of CLR types. The following code snippet demonstrates how to retrieve a value from the MyCustomers table that corresponds to an instance of user-defined MyCustomer class:
string cmdText = SELECT CustomerData FROM MyCustomers"; SqlConnection conn = new SqlConnection(connStr); SqlCommand cmd = new SqlCommand(cmdText, conn); cmd.Connection.Open(); SqlDataReader reader = cmd.ExecuteReader(); while(reader.Read()) { MyCustomer cust = (MyCustomer) reader[0]; // Do some work } cmd.Connection.Close();
A SQL Server 2005 user-defined type is stored as a binary stream of bytes. The get accessor of the data reader gets the bytes and deserializes them to a valid instance of the original class. The reverse process (serialization) takes place when a user-defined object is placed in a SQL Server column.
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