[ http://issues.apache.org/jira/browse/DERBY-721?page=all ]
Kathey Marsden updated DERBY-721:
---------------------------------
Derby Info: [Existing Application Impact, Release Note Needed]
I think this change may affect existing applicaitons. Because of the fact that
the InputStream retrieved from resultset is not clean , we now throw an
exception if the user gest the stream for a value in result set twice.
Typically this would mean they were getting wrong results before if they
retrieved the stream more than once. Now they will get an exception which is
correct but may be surprising to users that are now seeing this new symptom.
A formal release note still needs to be added.
> State of InputStream retrieved from resultset is not clean , if there exists
> previous InputStream .
> ---------------------------------------------------------------------------------------------------
>
> Key: DERBY-721
> URL: http://issues.apache.org/jira/browse/DERBY-721
> Project: Derby
> Issue Type: Bug
> Components: JDBC, Network Client
> Environment: [EMAIL PROTECTED]:~/derby/dev/trunk$ cat /proc/version
> Linux version 2.6.12-1-386 ([EMAIL PROTECTED]) (gcc version 4.0.2 20050917
> (prerelease) (Debian 4.0.1-8)) #1 Tue Sep 27 12:41:08 JST 2005
> [EMAIL PROTECTED]:~/derby/dev/trunk$ java -version
> java version "1.4.2_10"
> Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2_10-b03)
> Java HotSpot(TM) Client VM (build 1.4.2_10-b03, mixed mode)
> Reporter: Tomohito Nakayama
> Assigned To: Tomohito Nakayama
> Fix For: 10.2.0.0
>
> Attachments: DERBY-721.patch, DERBY-721_2.patch, DERBY-721_3.patch,
> DERBY-721_4.patch, DERBY-721_5.patch, DERBY-721_rollback_1+2.patch,
> testLob.java, testLob2.java, testResult.txt, testResult2.txt
>
>
> State of InputStream retrieved from ResultSet was not clean , if there exists
> previous InputStream retrieved from ResultSet .
> Test code ...
> PreparedStatement pst = conn.prepareStatement("insert into a(b)
> values(?)");
> byte[] data = new byte[1024 * 1024];
> for(int i = 0;
> i < 1024 * 1024;
> i ++){
> data[i] = (byte)(i % 256);
> }
> pst.setBinaryStream(1,new ByteArrayInputStream(data),data.length);
> pst.executeUpdate();
> pst.close();
>
>
> st = conn.createStatement();
> ResultSet rs = st.executeQuery("select b from a");
> rs.next();
>
> InputStream is = rs.getBinaryStream(1);
> System.out.println("Here goes first stream");
> System.out.println(is.read());
> System.out.println(is.read());
> System.out.println(is.read());
>
> is = rs.getBinaryStream(1);
> System.out.println("Here goes 2nd stream");
> System.out.println(is.read());
> System.out.println(is.read());
> System.out.println(is.read());
> Result ....
> [EMAIL PROTECTED]:~/derby/test/20051121$ java testLob
> Here goes first stream
> 0
> 1
> 2
> Here goes 2nd stream
> 7
> 8
> 9
> It is expected that result printed from first stream is as same as result
> printed from 2nd.
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