return result;
}
+/*
+ * Copy xmlChar string to PostgreSQL-owned memory, freeing the input.
+ *
+ * The input xmlChar is freed regardless of success of the copy.
+ */
+static char *
+xml_pstrdup_and_free(xmlChar *str)
+{
+ char *result;
+
+ if (str)
+ {
+ PG_TRY();
+ {
+ result = pstrdup((char *) str);
+ }
+ PG_CATCH();
+ {
+ xmlFree(str);
+ PG_RE_THROW();
+ }
+ PG_END_TRY();
+ xmlFree(str);
+ }
+ else
+ result = NULL;
+
+ return result;
+}
+
/*
* str is the null-terminated input string. Remaining arguments are
* output arguments; each can be NULL if value is not wanted.
#ifdef USE_LIBXML
/*
- * Convert XML node to text (dump subtree in case of element,
- * return value otherwise)
+ * Convert XML node to text.
+ *
+ * For attribute and text nodes, return the escaped text. For anything else,
+ * dump the whole subtree.
*/
static text *
xml_xmlnodetoxmltype(xmlNodePtr cur, PgXmlErrorContext *xmlerrcxt)
{
xmltype *result;
- if (cur->type == XML_ELEMENT_NODE)
+ if (cur->type != XML_ATTRIBUTE_NODE && cur->type != XML_TEXT_NODE)
{
xmlBufferPtr buf;
xmlNodePtr cur_copy;
/*
* There are four possible cases, depending on the number of nodes
* returned by the XPath expression and the type of the target column:
- * a) XPath returns no nodes. b) One node is returned, and column is
- * of type XML. c) One node, column type other than XML. d) Multiple
- * nodes are returned.
+ * a) XPath returns no nodes. b) The target type is XML (return all
+ * as XML). For non-XML return types: c) One node (return content).
+ * d) Multiple nodes (error).
*/
if (xpathobj->type == XPATH_NODESET)
{
{
*isnull = true;
}
- else if (count == 1 && typid == XMLOID)
- {
- text *textstr;
-
- /* simple case, result is one value */
- textstr = xml_xmlnodetoxmltype(xpathobj->nodesetval->nodeTab[0],
- xtCxt->xmlerrcxt);
- cstr = text_to_cstring(textstr);
- }
- else if (count == 1)
+ else
{
- xmlChar *str;
- xmlNodePtr node;
-
- /*
- * Most nodes (elements and even attributes) store their data
- * in children nodes. If they don't have children nodes, it
- * means that they are empty (e.g. <element/>). Text nodes and
- * CDATA sections are an exception: they don't have children
- * but have content in the Text/CDATA node itself.
- */
- node = xpathobj->nodesetval->nodeTab[0];
- if (node->type != XML_CDATA_SECTION_NODE &&
- node->type != XML_TEXT_NODE)
- node = node->xmlChildrenNode;
-
- str = xmlNodeListGetString(xtCxt->doc, node, 1);
- if (str != NULL)
+ if (typid == XMLOID)
{
- PG_TRY();
- {
- cstr = pstrdup((char *) str);
- }
- PG_CATCH();
+ text *textstr;
+ StringInfoData str;
+
+ /* Concatenate serialized values */
+ initStringInfo(&str);
+ for (int i = 0; i < count; i++)
{
- xmlFree(str);
- PG_RE_THROW();
+ textstr =
+ xml_xmlnodetoxmltype(xpathobj->nodesetval->nodeTab[i],
+ xtCxt->xmlerrcxt);
+
+ appendStringInfoText(&str, textstr);
}
- PG_END_TRY();
- xmlFree(str);
+ cstr = str.data;
}
else
{
- /* Ensure mapping of empty tags to PostgreSQL values. */
- cstr = "";
+ xmlChar *str;
+
+ if (count > 1)
+ ereport(ERROR,
+ (errcode(ERRCODE_CARDINALITY_VIOLATION),
+ errmsg("more than one value returned by column XPath expression")));
+
+ str = xmlXPathCastNodeSetToString(xpathobj->nodesetval);
+ cstr = str ? xml_pstrdup_and_free(str) : "";
}
}
+ }
+ else if (xpathobj->type == XPATH_STRING)
+ {
+ /* Content should be escaped when target will be XML */
+ if (typid == XMLOID)
+ cstr = escape_xml((char *) xpathobj->stringval);
else
- {
- StringInfoData str;
- int i;
+ cstr = (char *) xpathobj->stringval;
+ }
+ else if (xpathobj->type == XPATH_BOOLEAN)
+ {
+ char typcategory;
+ bool typispreferred;
+ xmlChar *str;
- Assert(count > 1);
+ /* Allow implicit casting from boolean to numbers */
+ get_type_category_preferred(typid, &typcategory, &typispreferred);
- /*
- * When evaluating the XPath expression returns multiple
- * nodes, the result is the concatenation of them all. The
- * target type must be XML.
- */
- if (typid != XMLOID)
- ereport(ERROR,
- (errcode(ERRCODE_CARDINALITY_VIOLATION),
- errmsg("more than one value returned by column XPath expression")));
+ if (typcategory != TYPCATEGORY_NUMERIC)
+ str = xmlXPathCastBooleanToString(xpathobj->boolval);
+ else
+ str = xmlXPathCastNumberToString(xmlXPathCastBooleanToNumber(xpathobj->boolval));
- /* Concatenate serialized values */
- initStringInfo(&str);
- for (i = 0; i < count; i++)
- {
- appendStringInfoText(&str,
- xml_xmlnodetoxmltype(xpathobj->nodesetval->nodeTab[i],
- xtCxt->xmlerrcxt));
- }
- cstr = str.data;
- }
+ cstr = xml_pstrdup_and_free(str);
}
- else if (xpathobj->type == XPATH_STRING)
+ else if (xpathobj->type == XPATH_NUMBER)
{
- cstr = (char *) xpathobj->stringval;
+ xmlChar *str;
+
+ str = xmlXPathCastNumberToString(xpathobj->floatval);
+ cstr = xml_pstrdup_and_free(str);
}
else
elog(ERROR, "unexpected XPath object type %u", xpathobj->type);
(2 rows)
SELECT * FROM xmltable('/root' passing '<root><element>a1a<!-- aaaa -->a2a<?aaaaa?> <!--z--> bbbb<x>xxx</x>cccc</element></root>' COLUMNS element text);
- element
--------------------
- a1aa2a bbbbcccc
+ element
+----------------------
+ a1aa2a bbbbxxxcccc
(1 row)
SELECT * FROM xmltable('/root' passing '<root><element>a1a<!-- aaaa -->a2a<?aaaaa?> <!--z--> bbbb<x>xxx</x>cccc</element></root>' COLUMNS element text PATH 'element/text()'); -- should fail
14
(4 rows)
+-- XPath result can be boolean or number too
+SELECT * FROM XMLTABLE('*' PASSING '<a>a</a>' COLUMNS a xml PATH '.', b text PATH '.', c text PATH '"hi"', d boolean PATH '. = "a"', e integer PATH 'string-length(.)');
+ a | b | c | d | e
+----------+---+----+---+---
+ <a>a</a> | a | hi | t | 1
+(1 row)
+
+\x
+SELECT * FROM XMLTABLE('*' PASSING '<e>pre<!--c1--><?pi arg?><![CDATA[&ent1]]><n2>&deep</n2>post</e>' COLUMNS x xml PATH 'node()', y xml PATH '/');
+-[ RECORD 1 ]-----------------------------------------------------------
+x | pre<!--c1--><?pi arg?><![CDATA[&ent1]]><n2>&deep</n2>post
+y | <e>pre<!--c1--><?pi arg?><![CDATA[&ent1]]><n2>&deep</n2>post</e>+
+ |
+
+\x
+SELECT * FROM XMLTABLE('.' PASSING XMLELEMENT(NAME a) columns a varchar(20) PATH '"<foo/>"', b xml PATH '"<foo/>"');
+ a | b
+--------+--------------
+ <foo/> | <foo/>
+(1 row)
+
---
(0 rows)
+-- XPath result can be boolean or number too
+SELECT * FROM XMLTABLE('*' PASSING '<a>a</a>' COLUMNS a xml PATH '.', b text PATH '.', c text PATH '"hi"', d boolean PATH '. = "a"', e integer PATH 'string-length(.)');
+ERROR: unsupported XML feature
+LINE 1: SELECT * FROM XMLTABLE('*' PASSING '<a>a</a>' COLUMNS a xml ...
+ ^
+DETAIL: This functionality requires the server to be built with libxml support.
+HINT: You need to rebuild PostgreSQL using --with-libxml.
+\x
+SELECT * FROM XMLTABLE('*' PASSING '<e>pre<!--c1--><?pi arg?><![CDATA[&ent1]]><n2>&deep</n2>post</e>' COLUMNS x xml PATH 'node()', y xml PATH '/');
+ERROR: unsupported XML feature
+LINE 1: SELECT * FROM XMLTABLE('*' PASSING '<e>pre<!--c1--><?pi arg?...
+ ^
+DETAIL: This functionality requires the server to be built with libxml support.
+HINT: You need to rebuild PostgreSQL using --with-libxml.
+\x
+SELECT * FROM XMLTABLE('.' PASSING XMLELEMENT(NAME a) columns a varchar(20) PATH '"<foo/>"', b xml PATH '"<foo/>"');
+ERROR: unsupported XML feature
+DETAIL: This functionality requires the server to be built with libxml support.
+HINT: You need to rebuild PostgreSQL using --with-libxml.
(2 rows)
SELECT * FROM xmltable('/root' passing '<root><element>a1a<!-- aaaa -->a2a<?aaaaa?> <!--z--> bbbb<x>xxx</x>cccc</element></root>' COLUMNS element text);
- element
--------------------
- a1aa2a bbbbcccc
+ element
+----------------------
+ a1aa2a bbbbxxxcccc
(1 row)
SELECT * FROM xmltable('/root' passing '<root><element>a1a<!-- aaaa -->a2a<?aaaaa?> <!--z--> bbbb<x>xxx</x>cccc</element></root>' COLUMNS element text PATH 'element/text()'); -- should fail
14
(4 rows)
+-- XPath result can be boolean or number too
+SELECT * FROM XMLTABLE('*' PASSING '<a>a</a>' COLUMNS a xml PATH '.', b text PATH '.', c text PATH '"hi"', d boolean PATH '. = "a"', e integer PATH 'string-length(.)');
+ a | b | c | d | e
+----------+---+----+---+---
+ <a>a</a> | a | hi | t | 1
+(1 row)
+
+\x
+SELECT * FROM XMLTABLE('*' PASSING '<e>pre<!--c1--><?pi arg?><![CDATA[&ent1]]><n2>&deep</n2>post</e>' COLUMNS x xml PATH 'node()', y xml PATH '/');
+-[ RECORD 1 ]-----------------------------------------------------------
+x | pre<!--c1--><?pi arg?><![CDATA[&ent1]]><n2>&deep</n2>post
+y | <e>pre<!--c1--><?pi arg?><![CDATA[&ent1]]><n2>&deep</n2>post</e>+
+ |
+
+\x
+SELECT * FROM XMLTABLE('.' PASSING XMLELEMENT(NAME a) columns a varchar(20) PATH '"<foo/>"', b xml PATH '"<foo/>"');
+ a | b
+--------+--------------
+ <foo/> | <foo/>
+(1 row)
+
projects / postgresql / commitdiff