/// <include file='doc\OracleBFile.uex' path='docs/doc[@for="OracleBFile.Read"]/*' />
public override int Read(
byte[] buffer,
int offset,
int count
)
{
AssertInternalLobIsValid();
if (!IsNull)
{
EnsureLobIsOpened();
}
int result = _lob.Read(buffer, offset, count);
return(result);
}
protected void DataList1_SelectedIndexChanged(object sender, EventArgs e)
{
int idx = DataList1.SelectedIndex;
Label lbl = (Label)DataList1.Items[idx].FindControl("Label2");
System.Data.OracleClient.OracleConnection conn = new System.Data.OracleClient.OracleConnection(ConfigurationManager.ConnectionStrings["CGConnectionString"].ToString());
System.Data.OracleClient.OracleCommand myCommand = new System.Data.OracleClient.OracleCommand("SELECT * FROM wf_cm_images WHERE ID = '" + lbl.Text + "'", conn);
conn.Open();
System.Data.OracleClient.OracleDataReader myReader = myCommand.ExecuteReader(System.Data.CommandBehavior.Default);
try
{
while (myReader.Read())
{
System.Data.OracleClient.OracleLob myLob = myReader.GetOracleLob(myReader.GetOrdinal("IMAGE"));
if (!myLob.IsNull)
{
string FN = myReader.GetString(myReader.GetOrdinal("IMAGE_NAME"));
//Use buffer to transfer data
byte[] b = new byte[myLob.Length];
//Read data from database
myLob.Read(b, 0, (int)myLob.Length);
Response.AddHeader("content-disposition", "attachment;filename=" + FN);
Response.ContentType = "application/octectstream";
Response.BinaryWrite(b);
Response.End();
}
}
}
finally
{
myReader.Close();
conn.Close();
}
}
void TryRead(OracleLob lob, long expectedCount, int id)
{
try {
long numberRead = lob.Read (new byte [10], 0, 10);
Assert.AreEqual (expectedCount, numberRead, "Wrong number of bytes read [" + id + ']');
}
catch (OracleException e) {
if (e.Code == 24801)
Assert.Fail ("Unable to perform a legal read [" + id + ']');
else throw;
}
}
internal long GetBytes(NativeBuffer_RowBuffer buffer, long fieldOffset, byte[] destinationBuffer, int destinationOffset, int length)
{
int num;
if (length < 0)
{
throw System.Data.Common.ADP.InvalidDataLength((long)length);
}
if ((destinationOffset < 0) || ((destinationBuffer != null) && (destinationOffset >= destinationBuffer.Length)))
{
throw System.Data.Common.ADP.InvalidDestinationBufferIndex(destinationBuffer.Length, destinationOffset, "bufferoffset");
}
if ((0L > fieldOffset) || (0xffffffffL < fieldOffset))
{
throw System.Data.Common.ADP.InvalidSourceOffset("fieldOffset", 0L, 0xffffffffL);
}
if (this.IsLob)
{
System.Data.OracleClient.OracleType oracleType = this._metaType.OracleType;
if ((System.Data.OracleClient.OracleType.Blob != oracleType) && (System.Data.OracleClient.OracleType.BFile != oracleType))
{
throw System.Data.Common.ADP.InvalidCast();
}
if (this.IsDBNull(buffer))
{
throw System.Data.Common.ADP.DataReaderNoData();
}
using (OracleLob lob = new OracleLob(this._lobLocator))
{
uint num3 = (uint)lob.Length;
uint num2 = (uint)fieldOffset;
if (num2 > num3)
{
throw System.Data.Common.ADP.InvalidSourceBufferIndex((int)num3, (long)num2, "fieldOffset");
}
num = (int)(num3 - num2);
if (destinationBuffer != null)
{
num = Math.Min(num, length);
if (0 < num)
{
lob.Seek((long)num2, SeekOrigin.Begin);
lob.Read(destinationBuffer, destinationOffset, num);
}
}
goto Label_0155;
}
}
if ((System.Data.OracleClient.OracleType.Raw != this.OracleType) && (System.Data.OracleClient.OracleType.LongRaw != this.OracleType))
{
throw System.Data.Common.ADP.InvalidCast();
}
if (this.IsDBNull(buffer))
{
throw System.Data.Common.ADP.DataReaderNoData();
}
this.FixupLongValueLength(buffer);
int num5 = OracleBinary.GetLength(buffer, this._lengthOffset, this._metaType);
int sourceOffset = (int)fieldOffset;
num = num5 - sourceOffset;
if (destinationBuffer != null)
{
num = Math.Min(num, length);
if (0 < num)
{
OracleBinary.GetBytes(buffer, this._valueOffset, this._metaType, sourceOffset, destinationBuffer, destinationOffset, num);
}
}
Label_0155:
return((long)Math.Max(0, num));
}
