Обсуждение: SQL request to retrieve the type of columns
I am looking for a SQL request (must be executed in a ECPG program) to retrieve the type of each column in a Postgres table. For example, \d wapi Table "wapi"Attribute | Type | Modifier ------------+-----------------------+----------wapinom | character(8) | wapicall | character varying(12) |wapitrans | character varying(4) | wapistruct | character varying(50) | It will be great to have the same result with a "select request". regards, -- Jean-Max Reymond ============================================================================Email : Jean-Max.Reymond@bull.netAddress: BULLSLDV (Saint Laurent du Var) ============================================================================
>>>>> "jr" == jean-max reymond <jean-max.reymond@bull.net> writes:
jr> It will be great to have the same result with a select request.
jr> regards,
man psql
read..read..read...
-E, --echo-hidden Echoes the actual queries generated by \d and other backslash commands.
You can use this if you wish to include similar functionality into your own pro- grams. This
isequivalent to setting the variable ECHO_HIDDEN from within psql.
--
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Vivek Khera, Ph.D. Khera Communications, Inc.
Internet: khera@kciLink.com Rockville, MD +1-240-453-8497
AIM: vivekkhera Y!: vivek_khera http://www.khera.org/~vivek/
On Tue, Feb 12, 2002 at 04:45:55PM +0100, Jean-Max Reymond wrote:
> I am looking for a SQL request (must be executed in a ECPG program) to
> retrieve the type of each column in a Postgres table.
>
> For example,
> \d wapi
> Table "wapi"
> Attribute | Type | Modifier
> ------------+-----------------------+----------
> wapinom | character(8) |
> wapicall | character varying(12) |
> wapitrans | character varying(4) |
> wapistruct | character varying(50) |
From the psql man page section on variables:
ECHO_HIDDEN
When this variable is set and a backslash command
queries the database, the query is first shown.
This way you can study the Postgres internals and
provide similar functionality in your own programs.
If you set the variable to the value ``noexec'',
the queries are just shown but are not actually
sent to the backend and executed.
\set ECHO_HIDDEN
CREATE TABLE foo (foo_id SERIAL PRIMARY KEY, name TEXT NOT NULL );
\d foo Table "foo"Attribute | Type | Modifier
-----------+---------+----------------------------------------------------foo_id | integer | not null default
nextval('"foo_foo_id_seq"'::text)name | text | not null
Index: foo_pkey
--
Andrew G. Hammond mailto:drew@xyzzy.dhs.org http://xyzzy.dhs.org/~drew/
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