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From "Knut Anders Hatlen (JIRA)" <derby-...@db.apache.org>
Subject [jira] Updated: (DERBY-137) Derby metadata always returns JDBC 2 result sets, even when JDBC 3 result sets are required.
Date Wed, 21 Jun 2006 13:15:31 GMT
     [ http://issues.apache.org/jira/browse/DERBY-137?page=all ]

Knut Anders Hatlen updated DERBY-137:
-------------------------------------

    Derby Info: [Patch Available]

Patch is available and ready for review. Thanks!

> Derby metadata always returns JDBC 2 result sets, even when JDBC 3 result sets are required.
> --------------------------------------------------------------------------------------------
>
>          Key: DERBY-137
>          URL: http://issues.apache.org/jira/browse/DERBY-137
>      Project: Derby
>         Type: Bug

>   Components: JDBC
>     Reporter: A B
>     Assignee: Knut Anders Hatlen
>     Priority: Critical
>  Attachments: derby-137-v1.diff, derby-137-v1.stat
>
> BACKGROUND:
> Derby's implementation of the JDBC class java.sql.DatabaseMetaData returns result sets
that are defined by the SQL queries in impl/jdbc/metadata.properties.
> PROBLEM:
> The current queries in the metadata.properties file are for JDBC 2 only.  The queries
do NOT account for the result sets as defined by JDBC 3, and thus even when JDBC 3 result
sets should be returned, a user will get metadata correlating to the JDBC 2 standard.
> Just for reference, here are a couple of examples of changes that have been made from
JDBC 2 to JDBC 3:
> 1) getColumns(): JDBC 2 specifies 18 columns, JDBC 3 specifies 22 (the four extra columns
are SCOPE_CATALOG, SCOPE_SCHEMA, SCOPE_TABLE, and SOURCE_DATA_TYPE).
> 2) getTables(): JDBC 2 specifics 5 columns, JDBC 3 specifies 10 (the five extra columns
are TYPE_CAT, TYPE_SCHEM, TYPE_NAME, SELF_REFERENCING_COL_NAME, and REF_GENERATION).
> 3) getProcedureColumns(): JDBC 2 specifies that DATA_TYPE is a "short"; JDBC 3 specifies
that DATA_TYPE is an "int".
> NOTES:
> JDBC 3 needs to be backward compatible with JDBC 2, so it should be okay to just modify
metadata.properties to return JDBC 3 result sets...

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