如何在不破坏图片的情况下将图像保存在数据库中？

Question

我在使用 BLOB 数据类型将图像保存到数据库时遇到问题，它成功保存了图像，但是当我使用图片框检索它时，它破坏了我的图像。我会向您展示我的应用程序的屏幕截图。我正在使用 vb.net。

这是我关于以 blob 数据类型保存图像文件的代码。

Dim filename As String = Me.OpenFileDialog1.FileName
    Dim FileSize As UInt32

    Dim conn As New MySqlConnection
    conn = New MySqlConnection("server=localhost;user=root;password=;database=ticketing_system;")
    conn.Open()

    Dim mstream As New System.IO.MemoryStream()
    Me.PbPicture.Image = Image.FromFile(Me.OpenFileDialog1.FileName)
    Me.PbPicture.Image.Save(mstream, System.Drawing.Imaging.ImageFormat.Jpeg)

    Dim arrImage() As Byte = mstream.GetBuffer()


    FileSize = mstream.Length
    Dim sqlcmd As New MySql.Data.MySqlClient.MySqlCommand
    Dim sql As String
    mstream.Close()

    ' DBconn.Close()

    sql = "INSERT INTO clientreports(img)VALUES(@File)"
    Try
        ' DBconn.Open()
        With sqlcmd
            .CommandText = sql

            .Connection = conn
            .Parameters.AddWithValue("@File", arrImage)
            .ExecuteNonQuery()
        End With

    Catch ex As Exception

        MsgBox(ex.Message)

    Finally

        conn.Close()

    End Try

这是我在图片框中显示图像的代码。

Dim strSQL As String
    Dim conn As New MySqlConnection
    Dim cmd As New MySqlCommand
    Dim dr As MySqlDataReader
    conn = New MySqlConnection("server=localhost;user=root;password=;database=ticketing_system;")


    Dim SQLConnection As MySqlConnection = New MySqlConnection
    'Dim connection As New SqlConnection("connection string here")
    Dim command As New MySqlCommand("SELECT img FROM errdeschis where err_id='31'", conn)

    conn.Open()

    Dim pictureData As Byte() = DirectCast(command.ExecuteScalar(), Byte())
    conn.Close()

    Dim picture As Image = Nothing
    'Create a stream in memory containing the bytes that comprise the image.
    Using stream As New IO.MemoryStream(pictureData)

        'Read the stream and create an Image object from the data.    
        PictureBox1.Image = Image.FromStream(stream)
    End Using

请大家帮帮我。

Answer 1

好的。对字段使用 MEDIUMBLOB 或 LONGBLOB。

Answer 2

你试过 psren 的回答吗？

将 BLOB 更改为 LONGBLOB

它对我有用！