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binary

What is the fastest way to insert a record with binary data in TQuery ?

Andrew
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andrewyu
Asked:
andrewyu
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1 Solution
 
ZifNabCommented:
how do you mean?
0
 
andrewyuAuthor Commented:
How can I select the record with a field type is binary in TQuery ?

Andrew
0
 
williams2Commented:
This will handle the record thing, isn't that what you mean?
(Just cut'n'paste to a default unit)

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs;

Type

  pRecord = ^TRecord;
  TRecord = record
    S: String[123];
    BlaBla: Integer;
  End;

  TData = Array[0..SizeOf(TRecord)-1] of Byte;

type
  TForm1 = class(TForm)
    procedure FormCreate(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

  Procedure BinToRecord(pRec: pRecord; var Data: TData);
  var
    p: pByteArray;
    i: Integer;
  Begin
    p:= Pointer(pRec);
    For i:= 0 to SizeOf(TData)-1 do p[i]:= Data[i];
  End;

  Procedure RecordToBin(pRec: pRecord; var Data: TData);
  var
    p: pByteArray;
    i: Integer;
  Begin
    p:= Pointer(pRec);
    For i:= 0 to SizeOf(TData)-1 do Data[i]:= p[i];
  End;

procedure TForm1.FormCreate(Sender: TObject);
Var
  Rec1,Rec2: TRecord;
  Data: TData;
begin
  Rec1.BlaBla:= 7;
  Rec1.S:= 'Test me';
  RecordToBin(@Rec1,Data);
  BinToRecord(@Rec2,Data);
  ShowMessage(Rec2.S+' : '+IntToStr(Rec2.BlaBla));
end;

end.

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andrewyuAuthor Commented:
Actually, I want to know how can I locate the record by the binary field in SQL select command ?

Anyway, thank you very much !

Andrew
0
 
williams2Commented:
Oh, I think I misuderstood your question then.

Under these circumstances you normally don't. What you do is to create a name for the record, and then select it by f.ex.:

"SELECT BinaryFieldname,BinaryField FROM BinTable WHERE BinaryFieldName='test'"

You normally don't want to search for a stream with the stream as a criteria. Even if it could be done, the query would be very slow. If You do not want to use names, number indexes works even better.

Cheers
Williams
0
 
andrewyuAuthor Commented:
So, do you mean the 'test' can be any ASCII code from 0-255 ?

Andrew
0
 
williams2Commented:
'test' can be any name from 'A','AAA' to 'Anders', but!!!! ..SQL is NOT case-sensitive, so if you are working with strings, you should not rely on ASCII values, only if you deal with strict Char types (not ANSI, they are WideChars!)

But I ment, you should be able to index the table by some kind of primarykey, which is a unique number or name identified with the table entry, it works the same way as the handle system works in windows.

If you need any help doing it, just say so. I've done it with severel types of databases.

Regards
Williams
0
 
andrewyuAuthor Commented:
I understand and I think I will use the TTable in this case ! But, is TTable much slower than the TQuery when I use it on the Oracle, Sybase, Interbase or MS-SQL ?

Anyway, thank you very much !

Andrew
0

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