Problem with Blob

Question

Hi to all
My JDBC driver not supports getBlob();
My code is
//reading blob1
mResultSet=mStatement.executeQuery("Select blob1 from table1");
mResultSet.next();
InputStream is = mResultSet.getBinaryStream("blob1");
//writing blob2
String mm="UPDATE table2 set blob2=?";
PreparedStatement pp=connection.prepareStatement(mm);
pp.setBinaryStream(1, is, is.available());
pp.executeUpdate();
Can somebody say why I can read blob1 (it is not null), but when I try read blob2 (after executing this code), i retrieve empty BinaryStream - null?
Thanks

Answer 1

Thanks very much Martin for reply,
But I can't understand this:
You wrote:
InputStream is = new InputStream(mResultSet.getBinaryStream("blob1");I write
InputStream is = mResultSet.getBinaryStream("blob1");
Now I think I have Input Stream with data or I'm wrong?
Maybe in this InputStream I have only Adress and no data?
byte[] buf = new byte[MAX_LENGTH];
is.read(buf, 0, buf.length);with these program reads data from InputStream to byte[].Why I must do it?
//Following API:
//setBinaryStream(int parameterIndex, InputStream x, int length)
I must write:
pp.setBinaryStream(1, is, is.available());
//pp is Prepered Statement; is - InputStream.
When I write
byte[] buf = new byte[MAX_LENGTH];
int IS_length=is.read(buf, 0, buf.length);
I get IS_length=8 and is.available()=8
Regards,
Sigis