Patch for broken JDBC's getColumn()

From: Jeroen van Vianen <jeroen(at)vanvianen(dot)nl>
To: pgsql-patches(at)postgresql(dot)org
Cc: pgsql-jdbc(at)postgresql(dot)org
Subject: Patch for broken JDBC's getColumn()
Date: 2001-08-28 21:20:19
Message-ID: 5.1.0.14.2.20010828230236.00a85fc8@ams010.satama.com
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Hi,

Attached is a patch for JDBC's getColumn() function that was broken /
flawed in the following ways:

1. Only returned columns that had a default value defined, rather than all
columns in a table
2. Used 2 * N + 1 queries to find out attributes, comments and typenames
for N columns.

By using some outer join syntax it is possible to retrieve all necessary
information in just one SQL statement. This means this version is only
suitable for PostgreSQL >= 7.1. Don't know whether that's a problem.

I've tested this function with current sources and 7.1.3 and patched both
jdbc1 and jdbc2. I haven't compiled nor tested the jdbc1 version though, as
I have no JDK 1.1 available.

Note the discussion in http://fts.postgresql.org/db/mw/msg.html?mid=1029626
regarding differences in obtaining comments on database object in 7.1 and
7.2. I was unable to use the following syntax (or similar ones):

select
...,
description
from
...
left outer join col_description(a.attrelid, a.attnum) description
order by
c.relname, a.attnum;

(the error was parse error at or near '(') so I had to paste the actual
code for the col_description function into the left outer join. Maybe
someone who is more knowledgable about outer joins might provide me with a
better SQL statement.

Please review.

Regards,

Jeroen

Attachment Content-Type Size
DatabaseMetaData.diff.gz application/octet-stream 3.7 KB

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