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Salve a tutti.
Per caricare un file in un database MySQL uso questo codice:
Dim conn As New MySqlConnection
Dim cmd As New MySqlCommand
Dim SQL As String
Dim FileSize As UInt32
Dim rawData() As Byte
Dim fs As FileStream
conn.ConnectionString = "server=ip;" _
& "uid=user;" _
& "pwd=pass;" _
& "database=test"
OpenFileDialog1.FileName = ""
OpenFileDialog1.Filter = "txt files (*.jpg)|*.png|All files (*.*)|*.*"
If OpenFileDialog1.ShowDialog() = System.Windows.Forms.DialogResult.OK Then
Try
fs = New FileStream(OpenFileDialog1.FileName, FileMode.Open, FileAccess.Read)
FileSize = fs.Length
rawData = New Byte(FileSize) {}
fs.Read(rawData, 0, FileSize)
fs.Close()
conn.Open()
SQL = "INSERT INTO upload (file_id,file_name,file_size,file) VALUES(NULL, ?file_name, ?file_size, ?file)"
cmd.Connection = conn
cmd.CommandText = SQL
cmd.Parameters.Add("?file_name", IO.Path.GetFileName(OpenFileDialog1.FileName))
cmd.Parameters.Add("?file_size", FileSize)
cmd.Parameters.Add("?file", rawData)
cmd.ExecuteNonQuery()
MessageBox.Show("File Inserted into database successfully!", _
"Success!", MessageBoxButtons.OK, MessageBoxIcon.Asterisk)
conn.Close()
Catch ex As Exception
MessageBox.Show("There was an error: " & ex.Message, "Error", _
MessageBoxButtons.OK, MessageBoxIcon.Error)
End Try
End If
Per scaricare un file in un database MySQL uso questo codice:
Dim conn As New MySqlConnection
Dim cmd As New MySqlCommand
Dim myData As MySqlDataReader
Dim SQL As String
Dim rawData() As Byte
Dim FileSize As UInt32
Dim fs As FileStream
conn.ConnectionString = "server=ip;" _
& "uid=user;" _
& "pwd=pass;" _
& "database=test"
SQL = "SELECT file_name, file_size, file FROM upload where file_id='2';"
Try
conn.Open()
cmd.Connection = conn
cmd.CommandText = SQL
myData = cmd.ExecuteReader
If Not myData.HasRows Then Throw New Exception("There are no BLOBs to save")
myData.Read()
FileSize = myData.GetUInt32(myData.GetOrdinal("file_size"))
rawData = New Byte(FileSize) {}
myData.GetBytes(myData.GetOrdinal("file"), 0, rawData, 0, FileSize)
fs = New FileStream("C:\" & myData.GetString(myData.GetOrdinal("file_name")), FileMode.OpenOrCreate, FileAccess.Write)
fs.Write(rawData, 0, FileSize)
fs.Close()
MessageBox.Show("File successfully written to disk!", "Success!", MessageBoxButtons.OK, MessageBoxIcon.Asterisk)
myData.Close()
conn.Close()
Catch ex As Exception
MessageBox.Show("There was an error: " & ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error)
End Try
Vorrei visualizzare la percentuale di caricamento del file in una label ed anche in una progressbar
Come posso fare?
Grazie in anticipo
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