pgjdbc/pgjdbc GitHub issues and pull requests (mirror)  

help / color / mirror / Atom feed

From: lukaseder (@lukaseder) <[email protected]>
To: pgjdbc/pgjdbc <[email protected]>
Subject: Re: [pgjdbc/pgjdbc] issue #538: Why getSchemaName return empty string or exists getBaseSchemaName and getColumnName return getColumnLabel?
Date: Mon, 12 Dec 2022 09:57:27 +0000
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>

I wonder if this could be implemented relatively easily by now? It was implemented for `PgResultSetMetaData::getTableName`, in case of which a query like this one is issued:

```sql
SELECT
  c.oid,
  a.attnum,
  a.attname,
  c.relname,
  n.nspname,
  a.attnotnull OR (t.typtype = 'd' AND t.typnotnull),
  a.attidentity != '' OR pg_catalog.pg_get_expr(d.adbin, d.adrelid) LIKE '%nextval(%'
FROM
  pg_catalog.pg_class c
JOIN pg_catalog.pg_namespace n ON
  (c.relnamespace = n.oid)
JOIN pg_catalog.pg_attribute a ON
  (c.oid = a.attrelid)
JOIN pg_catalog.pg_type t ON
  (a.atttypid = t.oid)
LEFT JOIN pg_catalog.pg_attrdef d ON
  (d.adrelid = a.attrelid
    AND d.adnum = a.attnum)
JOIN (...) vals ON
  (c.oid = vals.oid AND a.attnum = vals.attnum)
```

That query produces the schema name (`n.nspname`) and the information is cached. Since users are likely going to call `PgResultSetMetaData::getTableName` as well when they call `PgResultSetMetaData::getSchemaName`, I suspect there wouldn't be any additional overhead?

view thread (31+ messages)  latest in thread

reply

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Reply to all the recipients using the --to and --cc options:
  reply via email

  To: github://pgjdbc/pgjdbc
  Cc: [email protected], [email protected]
  Subject: Re: [pgjdbc/pgjdbc] issue #538: Why getSchemaName return empty string or exists getBaseSchemaName and getColumnName return getColumnLabel?
  In-Reply-To: <<[email protected]>>

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

This inbox is served by agora; see mirroring instructions
for how to clone and mirror all data and code used for this inbox