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Re: DatabaseMetaData.getIndexInfo() added

From: Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
To: William Webber <william(at)ferengi(dot)live(dot)com(dot)au>
Cc: pgsql-patches(at)postgresql(dot)org
Subject: Re: DatabaseMetaData.getIndexInfo() added
Date: 2001-05-16 17:46:14
Message-ID: 200105161746.f4GHkEQ20763@candle.pha.pa.us (view raw or flat)
Thread:
Lists: pgsql-jdbcpgsql-patches
Patch applied to jdbc1 and jdbc2.  This allows index lookups from jdbc. 
Thanks.


> Hi all!
> 
> Attached is a patch that implements DatabaseMetaData.getIndexInfo()
> for the JDBC2 driver.  It also fixes a compile error under jikes by
> casting characters in case statements of a byte-compared switch to
> bytes.
> 
> A few notes on getIndexInfo():
> 
> 1.) getArray() is not implemented for the postgresql JDBC driver yet,
> so getIndexInfo() parses the pg_index.indkey field into separate
> integers by hand.
> 
> 2.) I have guessed that if pg_index.indisclustered is "false", then
> the index is "hashed"; if not, line 2561 of the resultant class
> should have "tableIndexOther" rather than "tableIndexHashed".
> 
> 3.) I didn't know what sort sequence (if any) was used in indexes, so
> I have set it to "null" (unknown) on line 2566.
> 
> 4.) For "CARDINALITY" (number of unique index items, the 11th field of
> the ResultSet returned by getIndexInfo()) I have used
> pg_classes.reltuples.
> 
> I have tested this method, but hardly extensively.  Is there a proper
> regression test suite for the JDBC driver that tests can be added to?
> 
> William
> -- 
> William Webber                               william(at)peopleweb(dot)net(dot)au
> Senior Programmer                             
> PeopleWeb Australia                          http://www.peopleweb.com

[ Attachment, skipping... ]

-- 
  Bruce Momjian                        |  http://candle.pha.pa.us
  pgman(at)candle(dot)pha(dot)pa(dot)us               |  (610) 853-3000
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