MyDAC

TCompressedBlob Class

Holds large object value for field and parameter dtBlob, dtMemo data types and can compress its data.

For a list of all members of this type, see TCompressedBlob members.

Unit

MemData

Syntax

TCompressedBlob = class(TBlob);

Remarks

TCompressedBlob is a descendant of the TBlob class. It holds large object value for field and parameter dtBlob, dtMemo data types and can compress its data. For more information about using BLOB compression see TCustomDADataSet.Options.

Note: Internal compression functions are available in CodeGear Delphi 2007 for Win32, Borland Developer Studio 2006, Borland Delphi 2005, and Borland Delphi 7. To use BLOB compression under Borland Delphi 6 and Borland C++ Builder you should use your own compression functions. To use them set the CompressProc and UncompressProc variables declared in the MemUtils unit.

Example

type
   TCompressProc = function(dest: IntPtr; destLen: IntPtr; const source: IntPtr; sourceLen: longint): longint;
   TUncompressProc = function(dest: IntPtr; destlen: IntPtr; source: IntPtr; sourceLne: longint): longint;
   
var
   CompressProc: TCompressProc;
   UncompressProc: TUncompressProc; 

Inheritance Hierarchy

TSharedObject
   TBlob
      TCompressedBlob

See Also

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