VB.Net file to blob - sql server

Storing a file as a blob (Binary Large Object) in SQL Server involves several steps. Here's a detailed explanation with examples in VB.NET.

Create a SQL Server Database

First, make sure you have a SQL Server database where you want to store the file as a blob. You can use SQL Server Management Studio (SSMS) to create a database if you don't have one already.

Create a Table for Blob Storage

Create a table with a column of data type VARBINARY(MAX) to store the binary data of the file. For example:


VB.NET Code to Insert a File into SQL Server

You can use VB.NET to read a file and insert it into the SQL Server database. Here's an example using ADO.NET:

Imports System.Data.SqlClient ' Connection string to your SQL Server database Dim connectionString As String = "Data Source=ServerName;Initial Catalog=YourDatabase;Integrated Security=True" ' Path to the file you want to insert Dim filePath As String = "C:\Path\To\Your\File.pdf" Using connection As New SqlConnection(connectionString) connection.Open() ' Read the file into a byte array Dim fileData As Byte() = File.ReadAllBytes(filePath) ' SQL query to insert the file into the database Dim insertQuery As String = "INSERT INTO FileStorage (FileName, FileData) VALUES (@FileName, @FileData)" Using command As New SqlCommand(insertQuery, connection) command.Parameters.Add("@FileName", SqlDbType.NVarChar).Value = "YourFileName.pdf" command.Parameters.Add("@FileData", SqlDbType.VarBinary, -1).Value = fileData command.ExecuteNonQuery() End Using End Using

Retrieve a Blob from SQL Server

To retrieve a blob from SQL Server, you can use a SELECT statement and read the binary data back into a file. Here's an example to retrieve a file and save it to the disk:

Dim selectQuery As String = "SELECT FileData FROM FileStorage WHERE FileID = @FileID" Using connection As New SqlConnection(connectionString) connection.Open() Using command As New SqlCommand(selectQuery, connection) command.Parameters.Add("@FileID", SqlDbType.Int).Value = 1 ' Change the FileID as needed Using reader As SqlDataReader = command.ExecuteReader() If reader.Read() Then Dim fileData As Byte() = DirectCast(reader("FileData"), Byte()) Dim filePath As String = "C:\Path\To\Your\Destination\File.pdf" File.WriteAllBytes(filePath, fileData) End If End Using End Using End Using

This code demonstrates how to store a file as a blob in a SQL Server database and later retrieve it. Make sure to adapt the connection string, file paths, and table structure to your specific requirements.


You can store a file as a blob (Binary Large Object) in SQL Server by reading the file into a byte array and then inserting it into a table with a VARBINARY(MAX) column. To retrieve the file, you can run a SQL query to extract the binary data and save it back to a file on your disk using ADO.NET.