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Create a function quote_nullable(), which works the same as quote_literal()

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except that it returns the string 'NULL', rather than a SQL null, when called
with a null argument.  This is often a much more useful behavior for
constructing dynamic queries.  Add more discussion to the documentation
about how to use these functions.

Brendan Jurd
This commit is contained in:
Tom Lane
2008-03-23 00:24:20 +00:00
parent 40a3dfb7e3
commit 7de81124d5
6 changed files with 134 additions and 27 deletions
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3
src/include/utils/builtins.h
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/utils/builtins.h,v 1.308 2008/01/01 19:45:59 momjian Exp $
* $PostgreSQL: pgsql/src/include/utils/builtins.h,v 1.309 2008/03/23 00:24:20 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -914,6 +914,7 @@ extern int32 type_maximum_size(Oid type_oid, int32 typemod);
/* quote.c */
extern Datum quote_ident(PG_FUNCTION_ARGS);
extern Datum quote_literal(PG_FUNCTION_ARGS);
extern Datum quote_nullable(PG_FUNCTION_ARGS);
/* guc.c */
extern Datum show_config_by_name(PG_FUNCTION_ARGS);