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<h1>22. Virtuoso Functions Guide - XMLFOREST</h1>
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<div id="text">
<h2>XMLFOREST</h2>
<div class="refpurpose">Produces a forest of XML elements</div>
<div class="funcsynopsis">
<span class="funcdef">
<span class="function">XMLFOREST</span>
</span>
(<span class="paramdef">
<span class="parameter">string_expr1 [AS alias1]</span> varchar</span>,
<span class="paramdefoptional">[
<span class="optional">string_expr2 [AS alias2]</span> varchar
]</span>,
<span class="paramdefoptional">[
<span class="optional">...</span>
]</span>,
<span class="paramdefoptional">[
<span class="optional">string_exprN [AS aliasN]</span> varchar
]</span>);
</div>
<div class="refsect1">
<div class="refsect1title">Description</div>
<p>
<span class="computeroutput">XMLFOREST</span> produces a forest of XML elements from the given list of arguments.
The arguments may be string expressions with optional aliases. If string expression is a column name,
then you can omit the AS clause, and Virtuoso uses the partially escaped form of
the column name as the name of the enclosing tag. If the expression evaluates to NULL, then no element is
created for that expression. If none of the element is created, then the function returns NULL.
</p>
</div>
<div class="refsect1">
<div class="refsect1title">Parameters</div>
<div class="refsect2">
<span class="refsect2title">string_exprI [AS aliasI] – </span>
string value; AS clause is mandatory if the argument is not a column name but an expression of some other sort.
</div>
</div>
<div class="refsect1title">Errors</div>
<table class="data">
<tr>
<th class="data">SQLState</th>
<th class="data">Error Code</th>
<th class="data">Error Text</th>
<th class="data">Description</th>
</tr>
<tr>
<td class="data">
<a name="err37000" />
<span class="errorcode">37000</span>
</td>
<td class="data">
<a name="errSQ074" />
<span class="errorcode">SQ074</span>
</td>
<td class="data">
<span class="errorname">The special SQL function has invalid argument</span>
</td>
<td class="data">An argument is neither a column name nor an expression with an alias.</td>
</tr>
</table>
<br />
<p />
<p />
<div class="refsect1">
<div class="refsect1title">Examples</div>
<a name="ex_XMLFOREST" />
<div class="example">
<div class="exampletitle">XMLFOREST() with five parameters.</div>
<p>
The following example produces five (or four) elements ('FName', 'LName', 'str', 'Title', and 'Region' - if there is a value)
from the string expressions 'FirstName', 'LastName', 'string', 'Title', and 'Region',
concatenates the elements produced for each
employee, and produces one row for each employee in the result set.
</p>
<div>
<pre class="screen">
select XMLFOREST (
"FirstName" as "FName", "LastName" as "LName",
'string' as "str", "Title", "Region" )
from "Demo"."demo"."Employees";
callret
VARCHAR
_______________________________________________________________________________
<FName>Nancy</FName>
<LName>Davolio</LName>
<str>string</str>
<Title>Sales Representative</Title>
<Region>WA</Region>
. . .
<FName>Anne</FName>
<LName>Dodsworth</LName>
<str>string</str>
<Title>Sales Representative</Title>
9 Rows.
</pre>
</div>
<p>
The following example always produces five elements: empty 'Region' element is created for NULL values.
Note the difference in the last rows of this and the previous query results:
</p>
<div>
<pre class="screen">
select XMLFOREST (
"FirstName" as "FName", "LastName" as "LName",
'string' as "str", "Title", coalesce ("Region", '') as "Region")
from "Demo"."demo"."Employees";
callret
VARCHAR
_______________________________________________________________________________
<FName>Nancy</FName>
<LName>Davolio</LName>
<str>string</str>
<Title>Sales Representative</Title>
<Region>WA</Region>
. . .
<FName>Anne</FName>
<LName>Dodsworth</LName>
<str>string</str>
<Title>Sales Representative</Title>
<Region></Region>
9 Rows.
</pre>
</div>
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<div class="refsect1">
<div class="refsect1title">See Also</div>
<p>
<a href="fn_XMLELEMENT.html">XMLELEMENT()</a>
</p>
<p>
<a href="fn_XMLATTRIBUTES.html">XMLATTRIBUTES()</a>
</p>
<p>
<a href="fn_XMLAGG.html">XMLAGG()</a>
</p>
<p>
<a href="fn_XMLCONCAT.html">XMLCONCAT()</a>
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