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https://issues.apache.org/jira/browse/DERBY-5236?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Knut Anders Hatlen updated DERBY-5236:
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Attachment: d5236-4a-client-compatibility.diff
Attaching a new patch that disables the server-side fix when talking to old
clients, since those clients may get a StringIndexOutOfBoundsException if they
receive longer strings, and also because they don't know exactly how to handle
java.sql.DataTruncation warnings.
I've manually verified that old clients (tested 10.1.2.1 and 10.8.1.2) receive
shorter strings (just like they did before this issue) instead of failing with
a StringIndexOutOfBoundsException for these longer strings. Running the full
regression test suite now.
The fix is only disabled on releases prior to 10.8.2, on the assumption that
the fix gets into the upcoming 10.8.2 release. If it doesn't we'll have to
change that logic on trunk.
> Client driver silently truncates strings that exceed 32KB
> ---------------------------------------------------------
>
> Key: DERBY-5236
> URL: https://issues.apache.org/jira/browse/DERBY-5236
> Project: Derby
> Issue Type: Bug
> Components: Network Client
> Affects Versions: 10.8.1.2
> Reporter: Knut Anders Hatlen
> Assignee: Knut Anders Hatlen
> Attachments: d5236-1a-client-fetch-complete.diff,
> d5236-2a-longer-strings.diff, d5236-3a-warning.diff,
> d5236-4a-client-compatibility.diff, repro.diff, write-full-string.diff
>
>
> Can be seen with this JUnit test case that retrieves a VARCHAR value with
> 20000 characters. With the client driver, the string is truncated to 10900
> characters (32700 bytes when encoded in UTF-8).
> public void testLongColumn() throws SQLException {
> PreparedStatement ps = prepareStatement(
> "values cast(? as varchar(20000))");
> char[] chars = new char[20000];
> Arrays.fill(chars, '\u4e10');
> String str = new String(chars);
> ps.setString(1, str);
> JDBC.assertSingleValueResultSet(ps.executeQuery(), str);
> }
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