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From "Knut Anders Hatlen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DERBY-5236) Client driver silently truncates strings that exceed 32KB
Date Thu, 25 Aug 2011 12:37:29 GMT

    [ https://issues.apache.org/jira/browse/DERBY-5236?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13090978#comment-13090978
] 

Knut Anders Hatlen commented on DERBY-5236:
-------------------------------------------

The StringIndexOutOfBoundsException only happens with the patch (and I said the wrong number,
it fails on 65510 bytes). The current state of trunk is to send only 32700 bytes, so it'll
never attempt to send strings of that size.

I had a look in a debugger, and it looks like 65509 bytes completely fills two DSSs, and the
client never sees the last byte in the 65510-byte string. I haven't figured out yet if the
server doesn't send the byte or if it's the client that just doesn't fetch it.

> 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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