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https://issues.apache.org/jira/browse/DERBY-5236?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13061269#comment-13061269
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Dag H. Wanvik commented on DERBY-5236:
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+1 to error or warning when this happens. Since client behavior is different
than the embedded driver here, I'd personally prefer an error since warnings
are typically not checked, but I agree DataTruncation warning is reasonable. I
wish there were a way to get the entire string over the protocol, though...
> 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: 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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