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1. XMLCOMMENT Function

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xmlcomment

1. XMLCOMMENT Function

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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