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Extend EXPLAIN to support output in XML or JSON format.

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There are probably still some adjustments to be made in the details
of the output, but this gets the basic structure in place.

Robert Haas
This commit is contained in:
Tom Lane
2009-08-10 05:46:50 +00:00
parent 18894c401f
commit 9bd27b7c9e
12 changed files with 1153 additions and 364 deletions
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73
src/backend/utils/adt/xml.c
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2009, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/backend/utils/adt/xml.c,v 1.92 2009/06/11 14:49:04 momjian Exp $
* $PostgreSQL: pgsql/src/backend/utils/adt/xml.c,v 1.93 2009/08/10 05:46:50 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -1593,8 +1593,6 @@ map_xml_name_to_sql_identifier(char *name)
char *
map_sql_value_to_xml_value(Datum value, Oid type, bool xml_escape_strings)
{
StringInfoData buf;
if (type_is_array(type))
{
ArrayType *array;
@@ -1605,6 +1603,7 @@ map_sql_value_to_xml_value(Datum value, Oid type, bool xml_escape_strings)
int num_elems;
Datum *elem_values;
bool *elem_nulls;
StringInfoData buf;
int i;
array = DatumGetArrayTypeP(value);
@@ -1638,8 +1637,7 @@ map_sql_value_to_xml_value(Datum value, Oid type, bool xml_escape_strings)
{
Oid typeOut;
bool isvarlena;
char *p,
*str;
char *str;
/*
* Special XSD formatting for some data types
@@ -1788,35 +1786,50 @@ map_sql_value_to_xml_value(Datum value, Oid type, bool xml_escape_strings)
return str;
/* otherwise, translate special characters as needed */
initStringInfo(&buf);
for (p = str; *p; p++)
{
switch (*p)
{
case '&':
appendStringInfoString(&buf, "&");
break;
case '<':
appendStringInfoString(&buf, "&lt;");
break;
case '>':
appendStringInfoString(&buf, "&gt;");
break;
case '\r':
appendStringInfoString(&buf, "&#x0d;");
break;
default:
appendStringInfoCharMacro(&buf, *p);
break;
}
}
return buf.data;
return escape_xml(str);
}
}
/*
* Escape characters in text that have special meanings in XML.
*
* Returns a palloc'd string.
*
* NB: this is intentionally not dependent on libxml.
*/
char *
escape_xml(const char *str)
{
StringInfoData buf;
const char *p;
initStringInfo(&buf);
for (p = str; *p; p++)
{
switch (*p)
{
case '&':
appendStringInfoString(&buf, "&amp;");
break;
case '<':
appendStringInfoString(&buf, "&lt;");
break;
case '>':
appendStringInfoString(&buf, "&gt;");
break;
case '\r':
appendStringInfoString(&buf, "&#x0d;");
break;
default:
appendStringInfoCharMacro(&buf, *p);
break;
}
}
return buf.data;
}
static char *
_SPI_strdup(const char *s)
{