/// <summary>
/// isc_database_info
/// </summary>
private void DatabaseInfo(byte[] items, byte[] buffer, int bufferLength)
{
lock (this)
{
try
{
// see src/remote/protocol.h for packet definition (p_info struct)
this.Send.Write(IscCodes.op_info_database); // operation
this.Send.Write(this.handle); // db_handle
this.Send.Write(0); // incarnation
this.Send.WriteBuffer(items, items.Length); // items
this.Send.Write(bufferLength); // result buffer length
this.Send.Flush();
GdsResponse r = this.ReadGenericResponse();
Buffer.BlockCopy(r.Data, 0, buffer, 0, bufferLength);
}
catch (IOException)
{
throw new IscException(IscCodes.isc_network_error);
}
}
}
public override void PutSlice(System.Array sourceArray, int sliceLength)
{
lock (this.db)
{
try
{
byte[] sdl = this.GenerateSDL(this.Descriptor);
byte[] slice = this.EncodeSliceArray(sourceArray);
this.db.Send.Write(IscCodes.op_put_slice); // Op code
this.db.Send.Write(this.transaction.Handle); // Transaction
this.db.Send.Write((long)0); // Array Handle
this.db.Send.Write(sliceLength); // Slice length
this.db.Send.WriteBuffer(sdl); // Slice descriptor language
this.db.Send.Write(String.Empty); // Slice parameters
this.db.Send.Write(sliceLength); // Slice length
this.db.Send.Write(slice, 0, slice.Length); // Slice proper
this.db.Send.Flush();
GdsResponse r = this.db.ReadGenericResponse();
this.handle = r.BlobId;
}
catch (IOException)
{
throw new IscException(IscCodes.isc_net_read_err);
}
}
}
private void CreateOrOpen(int op, BlobParameterBuffer bpb)
{
lock (this.db)
{
try
{
this.db.Send.Write(op);
if (bpb != null)
{
this.db.Send.WriteTyped(IscCodes.isc_bpb_version1, bpb.ToArray());
}
this.db.Send.Write(this.transaction.Handle);
this.db.Send.Write(this.blobId);
this.db.Send.Flush();
GdsResponse r = this.db.ReadGenericResponse();
this.blobId = r.BlobId;
this.blobHandle = r.ObjectHandle;
}
catch (IOException)
{
throw new IscException(IscCodes.isc_net_read_err);
}
}
}
internal GdsResponse ReadGenericResponse()
{
try
{
if (this.ReadOperation() == IscCodes.op_response)
{
GdsResponse r = new GdsResponse(
this.receive.ReadInt32(),
this.receive.ReadInt64(),
this.receive.ReadBuffer());
r.Warning = this.ReadStatusVector();
return(r);
}
else
{
return(null);
}
}
catch (IOException)
{
throw new IscException(IscCodes.isc_net_read_err);
}
}
public void Query(
ServiceParameterBuffer spb,
int requestLength,
byte[] requestBuffer,
int bufferLength,
byte[] buffer)
{
lock (this)
{
try
{
this.connection.Send.Write(IscCodes.op_service_info); // operation
this.connection.Send.Write(this.Handle); // db_handle
this.connection.Send.Write((int)0); // incarnation
this.connection.Send.WriteTyped(
IscCodes.isc_spb_version, spb.ToArray()); // Service parameter buffer
this.connection.Send.WriteBuffer(
requestBuffer, requestLength); // request buffer
this.connection.Send.Write(bufferLength); // result buffer length
this.connection.Send.Flush();
GdsResponse r = this.connection.ReadGenericResponse();
Buffer.BlockCopy(r.Data, 0, buffer, 0, bufferLength);
}
catch (IOException)
{
throw new IscException(IscCodes.isc_network_error);
}
}
}
protected override byte[] GetSegment()
{
int requested = this.SegmentSize;
lock (this.db)
{
try
{
this.db.Send.Write(IscCodes.op_get_segment);
this.db.Send.Write(this.blobHandle);
this.db.Send.Write((requested + 2 < short.MaxValue) ? requested + 2 : short.MaxValue);
this.db.Send.Write((int)0); // Data segment
this.db.Send.Flush();
GdsResponse r = this.db.ReadGenericResponse();
this.RblRemoveValue(IscCodes.RBL_segment);
if (r.ObjectHandle == 1)
{
this.RblAddValue(IscCodes.RBL_segment);
}
else if (r.ObjectHandle == 2)
{
this.RblAddValue(IscCodes.RBL_eof_pending);
}
byte[] buffer = r.Data;
if (buffer.Length == 0)
{
// previous segment was last, this has no data
return(buffer);
}
int len = 0;
int srcpos = 0;
int destpos = 0;
while (srcpos < buffer.Length)
{
len = IscHelper.VaxInteger(buffer, srcpos, 2);
srcpos += 2;
Buffer.BlockCopy(buffer, srcpos, buffer, destpos, len);
srcpos += len;
destpos += len;
}
byte[] result = new byte[destpos];
Buffer.BlockCopy(buffer, 0, result, 0, destpos);
return(result);
}
catch (IOException)
{
throw new IscException(IscCodes.isc_net_read_err);
}
}
}
internal GdsResponse ReadGenericResponse()
{
GdsResponse response = this.connection.ReadGenericResponse();
if (response != null && response.Warning != null)
{
if (this.warningMessage != null)
{
this.warningMessage(response.Warning);
}
}
return(response);
}
public override void Prepare(string commandText)
{
// Clear data
this.Clear();
this.parameters = null;
this.fields = null;
lock (this.db)
{
if (this.state == StatementState.Deallocated)
{
// Allocate statement
this.Allocate();
}
try
{
this.db.Send.Write(IscCodes.op_prepare_statement);
this.db.Send.Write(this.transaction.Handle);
this.db.Send.Write(this.handle);
this.db.Send.Write((int)this.db.Dialect);
this.db.Send.Write(commandText);
this.db.Send.WriteBuffer(DescribeInfoItems, DescribeInfoItems.Length);
this.db.Send.Write(IscCodes.MAX_BUFFER_SIZE);
this.db.Send.Flush();
GdsResponse r = this.db.ReadGenericResponse();
this.fields = this.ParseSqlInfo(r.Data, DescribeInfoItems);
// Determine the statement type
this.statementType = this.GetStatementType();
this.state = StatementState.Prepared;
}
catch (IOException)
{
this.state = StatementState.Error;
throw new IscException(IscCodes.isc_net_read_err);
}
}
}
protected override void Seek(int position)
{
lock (this.db)
{
try
{
this.db.Send.Write(IscCodes.op_seek_blob);
this.db.Send.Write(this.blobHandle);
this.db.Send.Write(0); // Seek mode
this.db.Send.Write(position); // Seek offset
this.db.Send.Flush();
GdsResponse r = db.ReadGenericResponse();
this.position = r.ObjectHandle;
}
catch (IOException)
{
throw new IscException(IscCodes.isc_network_error);
}
}
}
internal GdsResponse ReadGenericResponse()
{
try
{
if (this.ReadOperation() == IscCodes.op_response)
{
GdsResponse r = new GdsResponse(
this.receive.ReadInt32(),
this.receive.ReadInt64(),
this.receive.ReadBuffer());
r.Warning = this.ReadStatusVector();
return r;
}
else
{
return null;
}
}
catch (IOException)
{
throw new IscException(IscCodes.isc_net_read_err);
}
}