Name
XMLInsertBefore — Modify an XML document by inserting new children before the node specified by given entity.
Synopsis
XMLInsertBefore
(
|
inout source any , |
| in insertion1 any , | |
| in insertion2 any , | |
| ... , | |
in
insertionN
any
); |
Description
The function modifies the XML document of the given
source XML tree entity by adding new
siblings to the node specified by the entity. Siblings will be
added right before the node. The source
entity should be XML tree entity, not "persistent XML" entity. The
value of source should be a node entity;
source can not be an attribute entity or a
root entity.
The values passed in parameters insertion1
... insertionN will be converted into XML
nodes according to rules described in section Composing Document Fragments From DOM
Function Arguments.
After calling the function, parameter
source is still a valid XML entity that
points to the same node. The value passed as
source can be used in the rest of caller
procedure.
Parameters
source
The XML tree entity whose document should be modified. This document should not be locked (see Changing XML Entities in DOM Style for details).
parameterI
The value to be added as child node of
source .
Return Types
The function returns NULL.
Examples
Example 24.545. XMLInsertBefore in a Virtuoso/PL procedure
The sample procedure contains two calls of
XMLInsertBefore . First call insert two new
element nodes just before the given node; second call
demonstrates how text nodes can be merged.
create procedure XMLInsertBefore_demo()
{
declare DESCRIPTION varchar (40);
declare ENTITY, ent any;
result_names (DESCRIPTION, ENTITY);
result ('EXAMPLE1', 'Plain inserting of some children');
ent := xpath_eval ('//child0', xtree_doc ('<a><child0></child0></a>'));
result ('The document to modify', xpath_eval ('/', ent));
result ('The place of insertion', ent);
XMLInsertBefore (ent, xtree_doc ('<child1/>'), xtree_doc ('<child2/>'));
result ('The changed document', xpath_eval ('/', ent));
result ('The original node is updated', ent);
result ('EXAMPLE2', 'Insertion that cause concatenation of text nodes');
ent := xpath_eval ('//b/text()', xtree_doc ('<a><b>world!</b></a>'));
result ('The document to modify', xpath_eval ('/', ent));
result ('The place of insertion', ent);
XMLInsertBefore (ent, 'Hello, ');
result ('The changed document', xpath_eval ('/', ent));
result ('The original node is updated', ent);
}
Done. -- 00000 msec.
XMLInsertBefore_demo()
DESCRIPTION ENTITY
VARCHAR VARCHAR
_______________________________________________________________________________
EXAMPLE1 Plain inserting of some children
The document to modify <a><child0 /></a>
The place of insertion <child0 />
The changed document <a><child1 /><child2 /><child0 /></a>
The original node is updated <child0 />
EXAMPLE2 Insertion that cause concatenation of text nodes
The document to modify <a><b>world!</b></a>
The place of insertion world!
The changed document <a><b>Hello, world!</b></a>
The original node is updated Hello, world!
10 Rows. -- 00000 msec.