[
https://issues.apache.org/jira/browse/DERBY-5090?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Knut Anders Hatlen updated DERBY-5090:
--------------------------------------
Attachment: Derby5090.java
Attaching a repro for the issue (Derby5090.java).
With the embedded driver, I get the following exception (no message text):
Exception in thread "main" java.io.IOException
at
org.apache.derby.iapi.services.io.NewByteArrayInputStream.read(NewByteArrayInputStream.java:53)
at Derby5090.main(Derby5090.java:22)
With the client driver, I get this exception (which does say the stream is
closed):
Exception in thread "main" java.io.IOException: The object is already closed.
at
org.apache.derby.client.am.CloseFilterInputStream.read(CloseFilterInputStream.java:50)
at Derby5090.main(Derby5090.java:22)
> Retrieving BLOB fields sometimes fails
> --------------------------------------
>
> Key: DERBY-5090
> URL: https://issues.apache.org/jira/browse/DERBY-5090
> Project: Derby
> Issue Type: Bug
> Components: JDBC, Miscellaneous
> Affects Versions: 10.7.1.1
> Environment: JDBC derby embedded driver
> Reporter: Unai Vivi
> Labels: BLOB, Ordering, exception, null, order, read
> Attachments: Derby5090.java
>
>
> 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
> [...]
--
This message is automatically generated by JIRA.
For more information on JIRA, see: http://www.atlassian.com/software/jira
