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xmlcomment

1. XMLCOMMENT Function​

The XMLCOMMENT function in H2 database is used to generate an XML comment within an XML document or fragment.

2. Syntax​

The syntax for the XMLCOMMENT function in H2 database is as follows:

XMLCOMMENT(comment)

Arguments​

  • comment: The comment text that needs to be included in the XML. It should be a string value.

Return​

  • The XMLCOMMENT function returns an XML comment.

3. Notes​

  • The XMLCOMMENT function in H2 database is used to add comments within an XML document or fragment.
  • The comment text provided to the XMLCOMMENT function should be enclosed within single quotes ('').
  • If the comment contains special characters such as <, >, or &, they will be automatically escaped in the generated XML comment.

4. Examples​

Here are a few examples demonstrating the usage of the XMLCOMMENT function in H2 database:

Example 1 - Adding an XML comment within an XML document:​

SELECT XMLELEMENT(NAME "root", XMLCOMMENT('This is a comment'), XMLELEMENT(NAME "child", 'Some text')) AS xml_data;

Output:

<root><!--This is a comment--><child>Some text</child></root>

Example 2 - Adding an XML comment within an XML fragment:​

SELECT XMLCOMMENT('This is a comment') AS xml_fragment;

Output:

<!--This is a comment-->
  • XMLELEMENT - Generate an XML element
  • XMLATTRIBUTES - Generate XML attributes