public override long GetBytes(int ordinal, long dataOffset, byte[] buffer, int bufferOffset, int length)
{
var value = GetRawValue(ordinal);
if (value is SqlBinary)
{
var binary = (SqlBinary)value;
var input = binary.GetInput();
input.Seek(dataOffset, SeekOrigin.Begin);
return(input.Read(buffer, bufferOffset, length));
}
if (value is IObjectRef)
{
var objRef = ((IObjectRef)value);
var lob = new DeveelDbLob(command.Connection, objRef.ObjectId, objRef.Size);
if (!lob.CanRead)
{
throw new NotSupportedException();
}
lob.Seek(dataOffset, SeekOrigin.Begin);
return(lob.Read(buffer, bufferOffset, length));
}
throw new NotSupportedException();
}
internal static ObjectId Upload(DeveelDbConnection connection, DeveelDbLob lob)
{
if (connection == null)
{
throw new InvalidOperationException("An open connection is required to upload the LOB");
}
var objId = connection.CreateLargeObject(lob.Length);
using (var channel = connection.OpenLargeObjectChannel(objId)) {
const int bufferSize = 2048;
var copyBuffer = new byte[bufferSize];
int readCount;
long copyOffset = 0;
lob.writeStream.Seek(0, SeekOrigin.Begin);
while ((readCount = lob.writeStream.Read(copyBuffer, 0, bufferSize)) > 0)
{
channel.PushData(copyOffset, copyBuffer, readCount);
copyOffset += readCount;
}
}
return(objId);
}
private void PrepareCommand()
{
if (Parameters != null && Parameters.Count > 0)
{
preparedParameters = new List <QueryParameter>(Parameters.Count);
foreach (DeveelDbParameter parameter in Parameters)
{
DeveelDbLob lob = null;
if (parameter.Value is DeveelDbLob)
{
lob = (DeveelDbLob)parameter.Value;
}
else if (parameter.Value is Stream)
{
var stream = (Stream)parameter.Value;
lob = new DeveelDbLob(parameter.Size);
stream.CopyTo(lob);
}
if (lob != null)
{
var objId = DeveelDbLob.Upload(connection, lob);
}
var sqlType = parameter.GetSqlType();
var queryParam = new QueryParameter(parameter.ParameterName, sqlType);
queryParam.Value = sqlType.CreateFrom(parameter.Value);
preparedParameters.Add(queryParam);
}
}
}
private void PrepareCommand()
{
if (Parameters != null && Parameters.Count > 0) {
preparedParameters = new List<QueryParameter>(Parameters.Count);
foreach (DeveelDbParameter parameter in Parameters) {
DeveelDbLob lob = null;
if (parameter.Value is DeveelDbLob) {
lob = (DeveelDbLob) parameter.Value;
} else if (parameter.Value is Stream) {
var stream = (Stream) parameter.Value;
lob = new DeveelDbLob(parameter.Size);
stream.CopyTo(lob);
}
if (lob != null) {
var objId = DeveelDbLob.Upload(connection, lob);
}
var sqlType = parameter.GetSqlType();
var queryParam = new QueryParameter(parameter.ParameterName, sqlType);
queryParam.Value = sqlType.CreateFrom(parameter.Value);
preparedParameters.Add(queryParam);
}
}
}
protected override void Dispose(bool disposing)
{
lob = null;
base.Dispose(disposing);
}
public LobInputStream(DeveelDbLob lob)
{
this.lob = lob;
}
protected override void Dispose(bool disposing)
{
lob = null;
base.Dispose(disposing);
}
public LobInputStream(DeveelDbLob lob)
{
this.lob = lob;
}
internal static ObjectId Upload(DeveelDbConnection connection, DeveelDbLob lob)
{
if (connection == null)
throw new InvalidOperationException("An open connection is required to upload the LOB");
var objId = connection.CreateLargeObject(lob.Length);
using (var channel = connection.OpenLargeObjectChannel(objId)) {
const int bufferSize = 2048;
var copyBuffer = new byte[bufferSize];
int readCount;
long copyOffset = 0;
lob.writeStream.Seek(0, SeekOrigin.Begin);
while ((readCount = lob.writeStream.Read(copyBuffer, 0, bufferSize)) > 0) {
channel.PushData(copyOffset, copyBuffer, readCount);
copyOffset += readCount;
}
}
return objId;
}
