Write(Byte[],Int32,Int32) Method

In This Topic

Writes a sequence of bytes to the current OracleLob stream, and advances the current position within this stream by the number of bytes written.

Syntax

Visual Basic
C#

'Declaration
 
Public Overloads Overrides Sub Write( _
   ByVal buffer() As Byte, _
   ByVal offset As Integer, _
   ByVal count As Integer _
)

public override void Write( 
   byte[] buffer,
   int offset,
   int count
)

Parameters

buffer: An array of bytes.
offset: The zero-based byte offset in the buffer.
count: The amount of bytes to be written to the current stream.

Remarks

If the write operation is successful, the position within the stream advances by the number of bytes written.

Note that writing data to OracleLob object results in immediate data transfer to server.

Example

In this example data is written to OracleLob object from a stream.

csharp

public void UploadBlob(OracleConnection myConnection)
{
  FileStream fs = new FileStream("D:\\Tmp\\_Water.bmp", FileMode.Open, FileAccess.Read);
  BinaryReader r = new BinaryReader(fs);
  myConnection.Open();
  OracleLob myLob = new OracleLob(myConnection,OracleDbType.Blob);
  int streamLength = (int)fs.Length;
  myLob.Write(r.ReadBytes(streamLength), 0, streamLength);
  OracleCommand myCommand = new OracleCommand("INSERT INTO Pictures (ID, PicName, Picture) VALUES(1,'Water',:Pictures)", myConnection);
  OracleParameter myParam = myCommand.Parameters.Add("Pictures", OracleDbType.Blob);
  myParam.OracleValue = myLob;
  try
  {
    Console.WriteLine(myCommand.ExecuteNonQuery() + " rows affected.");
  }
  finally
  {
    myConnection.Close();
    r.Close();
    fs.Close();
  }
}

Visual Basic

Public Sub UploadBlob(ByVal myConnection As OracleConnection)
  Dim fs As FileStream = New FileStream("D:\Tmp\_Water.bmp", FileMode.Open, FileAccess.Read)
  Dim r As BinaryReader = New BinaryReader(fs)
  myConnection.Open()
  Dim myLob As OracleLob = New OracleLob(myConnection, OracleDbType.Blob)
  Dim streamLength As Int32 = fs.Length
  myLob.Write(r.ReadBytes(streamLength), 0, streamLength)
  Dim myCommand As OracleCommand = New OracleCommand("INSERT INTO Pictures (ID, PicName, Picture) VALUES(1,'Water',:Pictures)", myConnection)
  Dim myParam As OracleParameter = myCommand.Parameters.Add("Pictures", OracleDbType.Blob)
  myParam.OracleValue = myLob
  Try
    Console.WriteLine(myCommand.ExecuteNonQuery() & " rows affected.")
  Finally
    myConnection.Close()
    r.Close()
    fs.Close()
  End Try
End Sub

Reference

OracleLob Class
OracleLob Members
Overload List
Read Method

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