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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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18
src/backend/utils/adt/quote.c
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@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/adt/quote.c,v 1.23 2008/01/01 19:45:52 momjian Exp $
* $PostgreSQL: pgsql/src/backend/utils/adt/quote.c,v 1.24 2008/03/23 00:24:19 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -96,3 +96,19 @@ quote_literal(PG_FUNCTION_ARGS)
PG_RETURN_TEXT_P(result);
}
/*
* quote_nullable -
* Returns a properly quoted literal, with null values returned
* as the text string 'NULL'.
*/
Datum
quote_nullable(PG_FUNCTION_ARGS)
{
if (PG_ARGISNULL(0))
PG_RETURN_DATUM(DirectFunctionCall1(textin,
CStringGetDatum("NULL")));
else
PG_RETURN_DATUM(DirectFunctionCall1(quote_literal,
PG_GETARG_DATUM(0)));
}