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From "Christian d'Heureuse (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-716) Re-enable VTIs
Date Sun, 15 Apr 2007 21:59:15 GMT

    [ https://issues.apache.org/jira/browse/DERBY-716?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12488968

Christian d'Heureuse commented on DERBY-716:

In H2 (http://www.h2database.com) there is a class called SimpleResultSet (http://www.h2database.com/javadoc/org/h2/tools/SimpleResultSet.html)
which makes it easy to implement a simple stored procedure that returns a Resultset.
Example (from http://www.h2database.com/html/features.html#user_defined_functions)::

public static ResultSet simpleResultSet() throws SQLException {
    SimpleResultSet rs = new SimpleResultSet();
    rs.addColumn("ID", Types.INTEGER, 10, 0);
    rs.addColumn("NAME", Types.VARCHAR, 255, 0);
    rs.addRow(new Object[] { new Integer(0), "Hello" });
    rs.addRow(new Object[] { new Integer(1), "World" });
    return rs;

And the interface SimpleRowSource (http://www.h2database.com/javadoc/org/h2/tools/SimpleRowSource.html)
can be used together with SimpleResultSet. to create rows on demand for dynamic result sets

> Re-enable VTIs
> --------------
>                 Key: DERBY-716
>                 URL: https://issues.apache.org/jira/browse/DERBY-716
>             Project: Derby
>          Issue Type: New Feature
>          Components: SQL
>            Reporter: Rick Hillegas
>         Attachments: functionTables.html
> Cloudscape used to expose Virtual Table Interfaces, by which any class which implemented
ResultSet could be included in a query's FROM list. Derby still exposes a number of these
VTIs as diagnostic tools. However, Derby now prevents customers from declaring their own VTIs.
The parser raises an error if a VTI's package isn't one of the Derby diagnostic packages.
> This is a very powerful feature which customers can use to solve many problems. We should
discuss the reasons that it was disabled and come up with a plan for putting this power back
into our customers' hands.

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