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Add current_database().

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> Quick system function to pull out the current database.
>
> I've used this a number of times to allow stored procedures to find out
> where they are.  Especially useful for those that do logging or hit a
> remote server.
>
> It's called current_database() to match with current_user().

It's also a necessity for an informational schema.  The catalog
(database) name is required in a number of places.

Rod Taylor
This commit is contained in:
Bruce Momjian 2002-08-20 04:46:00 +00:00
parent f736fdb022
commit de9801fc62
4 changed files with 30 additions and 4 deletions
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7
doc/src/sgml/func.sgml
View File

@ -1,5 +1,5 @@
<!--
$Header: /cvsroot/pgsql/doc/src/sgml/func.sgml,v 1.112 2002/08/16 23:01:18 tgl Exp $
$Header: /cvsroot/pgsql/doc/src/sgml/func.sgml,v 1.113 2002/08/20 04:45:59 momjian Exp $
PostgreSQL documentation
-->
@ -5082,6 +5082,11 @@ SELECT NULLIF(value, '(none)') ...
<entry><type>name[]</type></entry>
<entry>names of schemas in search path optionally including implicit schemas</entry>
</row>
<row>
<entry><function>current_database()</function></entry>
<entry><type>name</type></entry>
<entry>name of current database</entry>
</row>
</tbody>
</tgroup>
</table>

19
src/backend/utils/adt/misc.c
View File

@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/utils/adt/misc.c,v 1.24 2002/06/20 20:29:37 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/adt/misc.c,v 1.25 2002/08/20 04:45:59 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@ -17,6 +17,7 @@
#include <time.h>
#include "postgres.h"
#include "miscadmin.h"
#include "utils/builtins.h"
@ -111,3 +112,19 @@ userfntest(PG_FUNCTION_ARGS)
PG_RETURN_INT32(i);
}
/*
* current_database()
* Expose the current database to the user
*/
Datum
current_database(PG_FUNCTION_ARGS)
{
Name db;
db = (Name) palloc(NAMEDATALEN);
namestrcpy(db, DatabaseName);
PG_RETURN_NAME(db);
}

5
src/include/catalog/pg_proc.h
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@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: pg_proc.h,v 1.256 2002/08/17 13:04:15 momjian Exp $
* $Id: pg_proc.h,v 1.257 2002/08/20 04:45:59 momjian Exp $
*
* NOTES
* The script catalog/genbki.sh reads this file and generates .bki
@ -1106,6 +1106,9 @@ DESCR("does not match LIKE expression");
DATA(insert OID = 860 ( bpchar PGNSP PGUID 12 f f t f i 1 1042 "18" char_bpchar - _null_ ));
DESCR("convert char to char()");
DATA(insert OID = 861 ( current_database PGNSP PGUID 12 f f t f i 0 19 "0" current_database - _null_ ));
DESCR("returns the current database");
DATA(insert OID = 862 ( int4_mul_cash PGNSP PGUID 12 f f t f i 2 790 "23 790" int4_mul_cash - _null_ ));
DESCR("multiply");
DATA(insert OID = 863 ( int2_mul_cash PGNSP PGUID 12 f f t f i 2 790 "21 790" int2_mul_cash - _null_ ));

3
src/include/utils/builtins.h
View File

@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: builtins.h,v 1.192 2002/08/16 23:01:21 tgl Exp $
* $Id: builtins.h,v 1.193 2002/08/20 04:46:00 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@ -315,6 +315,7 @@ extern Datum nonnullvalue(PG_FUNCTION_ARGS);
extern Datum oidrand(PG_FUNCTION_ARGS);
extern Datum oidsrand(PG_FUNCTION_ARGS);
extern Datum userfntest(PG_FUNCTION_ARGS);
extern Datum current_database(PG_FUNCTION_ARGS);
/* not_in.c */
extern Datum int4notin(PG_FUNCTION_ARGS);