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Torsten,
On 8/28/18 09:27, Torsten Krah wrote:
> Am Dienstag, den 28.08.2018, 09:21 -0400 schrieb Christopher
> Schultz:
>> Interesting. I wonder why Postgres decided not to support that
>> through the standard JDBC API.
>>
>> Have you tried setting the "compatible" flag on the connection
>> just to see if it works for you?
>
> I am curious - afaik the standard JDBC API does not support e.g. to
> use seek() or truncate() on the BLOB to fast forward to some
> position in the file - how would you do that with the standard API
> Christopher - maybe i've missed that feature?
>
> The LargeObject API does support this.
I've never tried doing random-access reads into BLOBs in a database
before... that seems like an architectural mistake to me.
But if I had to, I'd try to:
ResultSet rs = ...;
Blob blob = rs.getBlob("bigfield");
// Take a chunk out of the middle
byte[] chunk = blob.getBytes(start, length);
// or
InputStream readFromMiddle = blob.getBinaryStream(strart, length);
// Truncate the blob
blob.truncate(newEndPos);
The Blob API isn't really that extensive... I'm not sure how you could
have missed those methods in there. It's really all there is.
Now... if Postgres artificially places a 1GiB limit on everything that
goes through that API, well, then you are kind of screwed.
- -chris
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