The Art of SQL Server FILESTREAM - Red Gate Software

Chapter 3: Accessing FILESTREAM Data from Client ApplicationsLab 1: Reads, Writes and Partial UpdatesIt is time for us to write some fully functional sample code that reads and writesFILESTREAM data to perform the FILESTREAM operations below.1. Inserting a new record (with T-SQL) and storing FILESTREAM data in the column.2. Reading information from a FILESTREAM column.3. Performing partial updates on the BLOB data stored in a FILESTREAM column.In the following sections, we'll provide the sample code and step-by-step explanationsfor each of these operations in C# using the Managed API. The sample code for VB.NET(using the Managed API) and C++ (using the Win32 API) is supplied separately in thedownload. Though the syntax and code used in each of these programming languagesdiffer a little, the overall flow of the operations remains the same across all theseprogramming languages.Inserting a new record with FILESTREAM dataLet us see an example that reads the content of a disk file and stores it in theFILESTREAM data container. We will load the content of the Microsoft Mouse image filethat we used in Chapter 2.The first step is to create a connection to the desired target SQL Server 2008 instancethat hosts the database with the FILESTREAM-enabled table in which we want to storethe BLOB data, as shown in Listing 3-14.//References at the top of the fileusing System;using System.Data;using System.Windows.Forms;using System.Data.SqlClient;106