The Art of SQL Server FILESTREAM - Red Gate Software

Chapter 3: Accessing FILESTREAM Data from Client ApplicationsFigure 3-2:Verifying that the copy contains two copies of the original text.We can see that the partial update has taken place as expected.Handling multiple FILESTREAM columns and rowsOne of the interesting features T-SQL programming offers is the ability to performset-based operations. A set operation allows you to process more than one row andcolumn in a single T-SQL query.However, when it comes to accessing FILESTREAM data through the streaming APIs,set-based operations are not applicable. In the examples discussed above, we saw howto read or write a single FILESTREAM cell using I/O streaming. If you want to read orwrite more than one FILESTREAM column or row, you must process each, one by one.The pseudocode in Listing 3-25 shows an approximate representation of how to readFILESTREAM data from more than one row and column./*Connect to databaseBegin a transactionRetrieve 10 rows from a table that has 3 FILESTREAM columnsSELECT TOP 10GET_FILESTREAM_TRANSACTION_CONTEXT(),FileStreamColumn1.PathName(),FileStreamColumn2.PathName(),FileStreamColumn3.PathName()114