[jira] Updated: (DERBY-1231) LIKE does not match empty strings when used with a prepared statement

["Dyre Tjeldvoll (JIRA)" <de...@db.apache.org>]

     [ http://issues.apache.org/jira/browse/DERBY-1231?page=all ]

Dyre Tjeldvoll updated DERBY-1231:
----------------------------------

    Attachment: vti.java

Attaching vti.java which is a simple repro for the problem (the name vti is not meaningful).

> LIKE does not match empty strings when used with a prepared statement
> ---------------------------------------------------------------------
>
>          Key: DERBY-1231
>          URL: http://issues.apache.org/jira/browse/DERBY-1231
>      Project: Derby
>         Type: Bug

>   Components: JDBC, SQL
>     Versions: 10.2.0.0, 10.1.2.0, 10.1.3.0, 10.3.0.0
>     Reporter: Dyre Tjeldvoll
>      Fix For: 10.2.0.0
>  Attachments: vti.java
>
> LIKE should give true for two 0-length strings. See SQL 2003 Ch. 8.5
> General Rules 3)c)i)
> The query SELECT * FROM t WHERE v like ''
> appears to give me all rows where v is an empty
> string, as expected.
> But a prepared statement
> SELECT * FROM t WHERE v like ?, with setString(1, "")
> always returns an empty result set. See attached repro for the full example.

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