database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-07-20 05:03:10 +03:00
Code Activity

Add XMLText function (SQL/XML X038)

Browse Source 
This function implements the standard XMLTest function, which
converts text into xml text nodes. It uses the libxml2 function
xmlEncodeSpecialChars to escape predefined entities (&"<>), so
that those do not cause any conflict when concatenating the text
node output with existing xml documents.

This also adds a note in  features.sgml about not supporting
XML(SEQUENCE). The SQL specification defines a RETURNING clause
to a set of XML functions, where RETURNING CONTENT or RETURNING
SEQUENCE can be defined. Since PostgreSQL doesn't support
XML(SEQUENCE) all of these functions operate with an
implicit RETURNING CONTENT.

Author: Jim Jones <jim.jones@uni-muenster.de>
Reviewed-by: Vik Fearing <vik@postgresfriends.org>
Discussion: https://postgr.es/m/86617a66-ec95-581f-8d54-08059cca8885@uni-muenster.de
This commit is contained in:
Daniel Gustafsson
2023-11-06 09:38:29 +01:00
parent 7b5275eec3
commit 526fe0d799
9 changed files with 167 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

22
src/backend/utils/adt/xml.c
View File

@ -47,6 +47,7 @@
#ifdef USE_LIBXML
#include <libxml/chvalid.h>
#include <libxml/entities.h>
#include <libxml/parser.h>
#include <libxml/parserInternals.h>
#include <libxml/tree.h>
@ -513,6 +514,27 @@ xmlcomment(PG_FUNCTION_ARGS)
}
Datum
xmltext(PG_FUNCTION_ARGS)
{
#ifdef USE_LIBXML
text *arg = PG_GETARG_TEXT_PP(0);
text *result;
xmlChar *xmlbuf = NULL;
xmlbuf = xmlEncodeSpecialChars(NULL, xml_text2xmlChar(arg));
Assert(xmlbuf);
result = cstring_to_text_with_len((const char *) xmlbuf, xmlStrlen(xmlbuf));
xmlFree(xmlbuf);
PG_RETURN_XML_P(result);
#else
NO_XML_SUPPORT();
return 0;
#endif /* not USE_LIBXML */
}
/*
* TODO: xmlconcat needs to merge the notations and unparsed entities