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From "Knut Anders Hatlen (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (DERBY-5236) Client driver silently truncates strings that exceed 32KB
Date Wed, 25 May 2011 13:21:47 GMT

     [ https://issues.apache.org/jira/browse/DERBY-5236?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Knut Anders Hatlen updated DERBY-5236:
--------------------------------------

    Attachment: write-full-string.diff

DDMWriter.writeLDString() truncates the string down to LONGVARCHAR_MAX_LEN bytes (not characters).
I tried to change it to just send the full string, regardless of its length (see the attached
patch), and that made the repro pass. (I haven't run any other tests.)

At the location where DRDAConnThread calls writeLDString(), there is a comment about the truncation:

					//WriteLDString and generate warning if truncated
					// which will be picked up by checkWarning()
					writer.writeLDString(val.toString(), index);

But there is no code that actually generates the warning if the string is truncated.

> 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
>         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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