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Storing/Retrieving Oracle BLOB fields

Posted on 2004-08-18
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Last Modified: 2010-05-18
Hi,

I need to know which is the best way (most efficient) to save and retrieve files from an Oracle BLOB field.

Should I use a normal table component ie.

Database.StartTransaction;
Table.Insert;
Table KEYFLD.AsInteger := new_val;
Table TESTFLD.LoadFromFile('D:\data\test.bmp');
Table.Post;
Database.Commit;

or a TQuery component, or is there another better method.

Code examples will be appreciated.

Regards

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Question by:barnarp
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4 Comments
 
LVL 25

Accepted Solution

by:
Tomas Helgi Johannsson earned 500 total points
ID: 11839035
         Hi

Use this method when posting to Oracle

with tTable do
begin
Insert;
TBlobField(FieldByName('PICTURE')).LoadFromFile(OpenPictureDialog1.FileName);
Post;
end;

Take also look at EDBImage and QREDBImage v.1.4  found on http://www.torry.net/pages.php?id=533.
If you want to post JPEGs to Oracle just remember to include jpeg in the uses clause.

Regards,
  Tomas Helgi
0
 
LVL 25

Expert Comment

by:Tomas Helgi Johannsson
ID: 11839085
Similar with retrieving

with tTable do
begin
.....
TBlobField(FieldByName('PICTURE')).SaveToFile(filename);
.....
end;

Regards,
  Tomas Helgi
0
 

Author Comment

by:barnarp
ID: 11839594
Thanks
0
 

Author Comment

by:barnarp
ID: 11867222
Hi,

I seem to be experiencing a problem with the ttable.

I have the following code as you suggested:

begin
   Open;
   Insert;
   TBlobField(FieldByName('CPLANT_BLOB')).LoadFromFile(DocCopyComment);
  Post;
end;

The moment I run Open, I get the following error:

General SQl Error ORA-000936: Missing Expression

Any idea what is going wrong?
0

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