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Image BLOB, MySQL

Posted on 2008-06-19
7
991 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

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Question by:AWestEng
  • 6
7 Comments
 
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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
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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
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