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Here are two patches. The guc_and_tablefunc patch addresses the two

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changes mentioned above, and also adds a new function to the tablefunc
API. The tablefunc API change adds the following function:

* Oid foidGetTypeId(Oid foid) - Get a function's typeid given the
* function Oid. Use this together with TypeGetTupleDesc() to get a
* TupleDesc which is derived from the function's declared return type.

In the next post I'll send the contrib/tablefunc patch, which
illustrates the usage of this new function. Also attached is a doc patch
for this change. The doc patch also adds a function that I failed to
document previously.

Joe Conway
This commit is contained in:
Bruce Momjian 2002-07-30 16:20:03 +00:00
parent ceb438ed8c
commit 23a8b77d42
4 changed files with 24 additions and 6 deletions
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10
doc/src/sgml/xfunc.sgml
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@ -1,5 +1,5 @@
<!--
$Header: /cvsroot/pgsql/doc/src/sgml/xfunc.sgml,v 1.53 2002/07/18 04:47:17 momjian Exp $
$Header: /cvsroot/pgsql/doc/src/sgml/xfunc.sgml,v 1.54 2002/07/30 16:20:03 momjian Exp $
-->
<chapter id="xfunc">
@ -1556,6 +1556,14 @@ HeapTuple BuildTupleFromCStrings(AttInMetadata *attinmeta, char **values)
should be set to NULL.
</para>
<para>
In order to get an attribute "in" function and typelem value given the
typeid, use
<programlisting>
void get_type_metadata(Oid typeid, Oid *attinfuncid, Oid *attelem)
</programlisting>
</para>
<para>
Finally, in order to return a tuple using the SRF portion of the API
(described below), the tuple must be converted into a Datum. Use

14
src/backend/utils/misc/guc.c
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@ -5,7 +5,7 @@
* command, configuration file, and command line options.
* See src/backend/utils/misc/README for more information.
*
* $Header: /cvsroot/pgsql/src/backend/utils/misc/guc.c,v 1.75 2002/07/20 15:12:55 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/misc/guc.c,v 1.76 2002/07/30 16:20:03 momjian Exp $
*
* Copyright 2000 by PostgreSQL Global Development Group
* Written by Peter Eisentraut <peter_e@gmx.net>.
@ -2347,13 +2347,21 @@ GetConfigOptionByName(const char *name, const char **varname)
* form of name. Return value is palloc'd.
*/
char *
GetConfigOptionByNum(int varnum, const char **varname)
GetConfigOptionByNum(int varnum, const char **varname, bool *noshow)
{
struct config_generic *conf = guc_variables[varnum];
struct config_generic *conf;
/* check requested variable number valid */
Assert((varnum >= 0) && (varnum < num_guc_variables));
conf = guc_variables[varnum];
if (varname)
*varname = conf->name;
if (noshow)
*noshow = (conf->flags & GUC_NO_SHOW_ALL) ? true : false;
return _ShowOption(conf);
}

2
src/include/funcapi.h
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@ -139,6 +139,8 @@ typedef struct
* HeapTuple BuildTupleFromCStrings(AttInMetadata *attinmeta, char **values) -
* build a HeapTuple given user data in C string form. values is an array
* of C strings, one for each attribute of the return tuple.
* void get_type_metadata(Oid typeid, Oid *attinfuncid, Oid *attelem) - Get
* an attribute "in" function and typelem value given the typeid.
*
* Macro declarations:
* TupleGetDatum(TupleTableSlot *slot, HeapTuple tuple) - get a Datum

4
src/include/utils/guc.h
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@ -4,7 +4,7 @@
* External declarations pertaining to backend/utils/misc/guc.c and
* backend/utils/misc/guc-file.l
*
* $Id: guc.h,v 1.19 2002/07/20 15:12:56 tgl Exp $
* $Id: guc.h,v 1.20 2002/07/30 16:20:03 momjian Exp $
*/
#ifndef GUC_H
#define GUC_H
@ -87,7 +87,7 @@ extern bool set_config_option(const char *name, const char *value,
extern void ShowGUCConfigOption(const char *name);
extern void ShowAllGUCConfig(void);
extern char *GetConfigOptionByName(const char *name, const char **varname);
extern char *GetConfigOptionByNum(int varnum, const char **varname);
extern char *GetConfigOptionByNum(int varnum, const char **varname, bool *noshow);
extern int GetNumConfigOptions(void);
extern void SetPGVariable(const char *name, List *args, bool is_local);