Solved

Image BLOB, MySQL

Posted on 2008-06-19
7
989 Views
Last Modified: 2013-11-26
Hi

I'm trying to fix my code so I can Insert a image from a picture box to a BLOB filed in my MySQL table

I'm not sure how to create the the Query.
Dim QueryString As String = "UPDATE tbl_employed SET(Image) = (@Image) WHERE EmpNr = 1234"
Public Function InsertImageToBLOB(ByVal QueryString As String, ByVal FieldName As String, ByVal PictureBox As PictureBox) As Integer
    Dim ms As MemoryStream = New MemoryStream       '// Create a new memory reader
    Dim bytBLOBData() As Byte                       '// Create a byte array to store picture
    Dim intBytes As Integer = 0                     '// Size of picture
    Dim iAffectedRows As Integer = 0                '// Number of affected rows
 
    Try
        PictureBox.Image.Save(ms, ImageFormat.Jpeg) '// Get Image from picturebox
        intBytes = CInt(ms.Length - 1)              '// Calulate byte size of image
        ReDim bytBLOBData(intBytes)                 '// Set size if image byte array
        ms.Position = 0                             '// Start position for reader
        ms.Read(bytBLOBData, 0, CInt(ms.Length))    '// Read the image into the bytBLOBData variable
        ms.Close()                                  '// Close reading stream
    Catch ex As Exception
        Throw
    End Try
 
    '// The "Using" block will automatically dispose of the connection when we're finished
    Using MyConnectionMySQLOpen As New MySqlClient.MySqlConnection(m_strConnectionString)
 
        Try
            Dim prm As New MySql.Data.MySqlClient.MySqlParameter( _
                        "@" & FieldName, _
                        MySql.Data.MySqlClient.MySqlDbType.Blob, _
                        bytBLOBData.Length, _
                        ParameterDirection.Input, _
                        False, 0, 0, Nothing, DataRowVersion.Current, bytBLOBData)
 
            '// Open the DB connection
            MyConnectionMySQLOpen.Open()
 
            '// Create a new command object
            Dim cmd As New MySqlClient.MySqlCommand()
 
            '// Set command properties
            With cmd
                .Connection = MyConnectionMySQLOpen
                .CommandType = CommandType.Text
                .CommandText = QueryString
                .Parameters.Add(prm)
            End With
 
            '// Execute the SQL query with the command object, and get the affected rows in the DB back
            iAffectedRows = cmd.ExecuteNonQuery()
 
            '// Close the connection
            MyConnectionMySQLOpen.Close()
 
        Catch MyException As MySqlException
            Throw
        Catch ex As Exception
            Throw
        Finally
            '// Close connection if an exception was thrown before the connection could close
            If MyConnectionMySQLOpen.State = ConnectionState.Open Then
                MyConnectionMySQLOpen.Close()
            End If
        End Try
    End Using
 
    Return iAffectedRows
End Function

Open in new window

0
Comment
Question by:AWestEng
  • 6
7 Comments
 
LVL 24

Accepted Solution

by:
mankowitz earned 500 total points
ID: 21823723
code looks good, but mysql parameters are marked with ? instead of @.

i.e. SET(Image) = (?Image)
0
 
LVL 1

Author Comment

by:AWestEng
ID: 21825658
same in this code then?

  Dim prm As New MySql.Data.MySqlClient.MySqlParameter( _
                        "@" & FieldName, _
                        MySql.Data.MySqlClient.MySqlDbType.Blob, _
                        bytBLOBData.Length, _
                        ParameterDirection.Input, _
                        False, 0, 0, Nothing, DataRowVersion.Current, bytBLOBData)
 

0
 
LVL 1

Author Comment

by:AWestEng
ID: 21825675
hmm are you sure about the ? the .Net connector generates @ if I use a DataAdapter in a dataset
0
VMware Disaster Recovery and Data Protection

In this expert guide, you’ll learn about the components of a Modern Data Center. You will use cases for the value-added capabilities of Veeam®, including combining backup and replication for VMware disaster recovery and using replication for data center migration.

 
LVL 1

Author Comment

by:AWestEng
ID: 21825734
oki. you might be right there :)

No I got this exception
"Data too long for column 'Image' at row 1"
0
 
LVL 1

Author Comment

by:AWestEng
ID: 21825888
thx m8.. I change to LONGBLOB the Imgae size was 250 kB
0
 
LVL 1

Author Comment

by:AWestEng
ID: 21825898
mankowitz:are you still there?

I will give you the points, but I need help with a reading the blob from MySql an put it back to the picturebox.

I will create a new question, can you help me with that?
0
 
LVL 1

Author Comment

by:AWestEng
ID: 21826174
here is where the new question is created

http://www.experts-exchange.com/Database/MySQL/Q_23500417.html
0

Featured Post

Migrating Your Company's PCs

To keep pace with competitors, businesses must keep employees productive, and that means providing them with the latest technology. This document provides the tips and tricks you need to help you migrate an outdated PC fleet to new desktops, laptops, and tablets.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
VB.NET 1 22
VB.net and sql server 4 36
VB.Net - MemoryMappedFiles - Confirm receipt 2 19
vb.net and creating a class 5 17
Wouldn’t it be nice if you could test whether an element is contained in an array by using a Contains method just like the one available on List objects? Wouldn’t it be good if you could write code like this? (CODE) In .NET 3.5, this is possible…
Introduction This article is intended for those who are new to PHP error handling (https://www.experts-exchange.com/articles/11769/And-by-the-way-I-am-New-to-PHP.html).  It addresses one of the most common problems that plague beginning PHP develop…
A short tutorial showing how to set up an email signature in Outlook on the Web (previously known as OWA). For free email signatures designs, visit https://www.mail-signatures.com/articles/signature-templates/?sts=6651 If you want to manage em…

778 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question