[
https://issues.apache.org/jira/browse/DERBY-5090?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Kristian Waagan resolved DERBY-5090.
------------------------------------
Resolution: Fixed
Fix Version/s: 10.9.0.0
Issue & fix info: [Newcomer, Release Note Needed, Repro attached,
Workaround attached] (was: [Workaround attached, Repro attached, Release Note
Needed, Patch Available, Newcomer])
Since the incorporated issue and this issue have been marked as unsuitable for
backport, there is no more work to be done.
Note that the fix isn't required for proper operation. The fix makes Derby balk
if someone tries to do something that's not in accordance with the JDBC
specification.
> Retrieving BLOB fields sometimes fails
> --------------------------------------
>
> Key: DERBY-5090
> URL: https://issues.apache.org/jira/browse/DERBY-5090
> Project: Derby
> Issue Type: Bug
> Components: JDBC
> Affects Versions: 10.7.1.1
> Environment: JDBC derby embedded driver
> Reporter: Unai Vivi
> Assignee: Kristian Waagan
> Labels: BLOB, derby_backport_reject_10_8, exception, null, read
> Fix For: 10.9.0.0
>
> Attachments: Derby5090.java, Derby5090_2.java, Derby5090_3.java,
> derby-5090-1a-fix.diff, derby-5090-1a-fix.stat, derby-5090-1b-fix.diff,
> derby-5090-2a-test.diff, derby-5090-2a-test.stat,
> derby-5090-3a-change_messages.diff, releaseNote.html
>
>
> This is my first issue report, so please be understanding if I'm posting the
> wrong thing, in the wrong place or in the wrong way. I just want to help. :)
> While iterating through a ResultSet, when accessing a BLOB field to read its
> contents via an InputStream, I noticed that:
> - if the current ResultSet's has been "warmed up" by retrieving another
> column first, everything it's fine;
> - if, on the other hand, you first-thing access the BLOB (and read other
> columns later), then upon reading the first byte out the InputStream bound to
> the BLOB field (ResultSet.getBinaryStream("col_name")) an IOException is
> thrown (and IOException's getMessage() method returns null).
> Following is an example, taken from a real application. The two code segments
> only differ in the fact that a SMALLINT & VARCHAR read is done before/after
> the BLOB read.
> --Working snippet--
> [...]
> icRelPath[i] = "imm" + File.separator + "ic" + "_" +
> rs.getShort("setIcone") + "_" + i + "." + rs.getString("estensione");
> AutoCloseInputStream acis = new
> AutoCloseInputStream(rs.getBinaryStream("ic" + i));
> if (rs.wasNull())
> icRelPath[i] = null;
> else
> {
> //icRelPath[i] = "imm" + File.separator + "ic" + "_"
> + rs.getShort("setIcone") + "_" + i + "." + rs.getString("estensione");
> BufferedInputStream bis = new
> BufferedInputStream(acis);
> int b = bis.read();//READS FINE
> [...]
> --Broken snippet--
> [...]
> //icRelPath[i] = "imm" + File.separator + "ic" + "_" +
> rs.getShort("setIcone") + "_" + i + "." + rs.getString("estensione");
> AutoCloseInputStream acis = new
> AutoCloseInputStream(rs.getBinaryStream("ic" + i));
> if (rs.wasNull())
> icRelPath[i] = null;
> else
> {
> icRelPath[i] = "imm" + File.separator + "ic" + "_" +
> rs.getShort("setIcone") + "_" + i + "." + rs.getString("estensione");
> BufferedInputStream bis = new
> BufferedInputStream(acis);
> int b = bis.read();//THROWS IOException WITH A null
> ERROR MESSAGE STRING
> [...]
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