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<?xml version="1.0" encoding="ISO-8859-1"?>
<!--
-
- This file is part of the OpenLink Software Virtuoso Open-Source (VOS)
- project.
-
- Copyright (C) 1998-2018 OpenLink Software
-
- This project is free software; you can redistribute it and/or modify it
- under the terms of the GNU General Public License as published by the
- Free Software Foundation; only version 2 of the License, dated June 1991.
-
- This program is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- General Public License for more details.
-
- You should have received a copy of the GNU General Public License along
- with this program; if not, write to the Free Software Foundation, Inc.,
- 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
-
-
-->
<refentry id="fn_xml_auto_schema">
<refmeta>
<refentrytitle>xml_auto_schema</refentrytitle>
<refmiscinfo>xml</refmiscinfo>
</refmeta>
<refnamediv>
<refname>xml_auto_schema</refname>
<refpurpose>returns an XML schema for the result of an SQL query with a FOR XML clause</refpurpose>
</refnamediv>
<refsynopsisdiv>
<funcsynopsis id="fsyn_xml_auto_schema">
<funcprototype id="fproto_xml_auto_schema">
<funcdef>varchar <function>xml_auto_schema</function></funcdef>
<paramdef>in <parameter>query</parameter> varchar</paramdef>
<paramdef>in <parameter>root_element</parameter> varchar</paramdef>
</funcprototype>
</funcsynopsis>
</refsynopsisdiv>
<refsect1 id="desc_xml_auto_schema"><title>Description</title>
<para>
This function returns an XML schema for the results of an SQL query
with a FOR XML clause. The returned schema will apply to the output
generated by <function>xml_auto()</function> with the query in
question after wrapping it in the specified root element.
</para>
</refsect1>
<refsect1 id="params_xml_auto_schema"><title>Parameters</title>
<refsect2><title>query</title>
<para>SQL query</para></refsect2>
<refsect2><title>root_element</title>
<para>name of root element container</para></refsect2>
</refsect1>
<refsect1 id="ret_xml_auto_schema"><title>Return Types</title><para>varchar result containing the
schema of the XML document.</para></refsect1>
<refsect1 id="errors_xml_auto_schema"><title>Errors</title>
<para>If the <parameter>query</parameter> argument is not a valid SQL statement, i.e. SQL compiler signals an error message,
the function resignals the error.
</para>
</refsect1>
<refsect1 id="examples_xml_auto_schema"><title>Examples</title>
<example id="ex_xml_auto_achema"><title>Simple Schema Generation</title>
<programlisting>
SQL> select xml_auto_schema (' select "category"."CategoryID", "CategoryName",
"ProductName", "ProductID"
from "Demo".."Categories" "category", "Demo".."Products" as "product"
where "product"."CategoryID" = "category"."CategoryID"
for xml auto element', 'root');
callret
VARCHAR
_______________________________________________________________________________
<xsd:schema xmlns:xsd="http://www.w3.org/1999/XMLSchema">
<xsd:annotation>
<xsd:documentation>
Schema for output of the following SQL statement:
<[CDATA[ select "category"."CategoryID",
"CategoryName", "ProductName", "ProductID"
from "Demo".."Categories" "category",
"Demo".."Products" as "product"
where "product"."CategoryID" = "category"."CategoryID"
for xml auto element]]>
</xsd:documentation>
</xsd:annotation>
<xsd:element name="root" type="root__Type"/>
<xsd:complexType name="root__Type">
<xsd:element name="category" type="category_Type"
minOccurs="0" maxOccurs="unbounded"/>
</xsd:complexType>
<xsd:complexType name="category_Type">
<xsd:element name="CategoryID" type="xsd:int" precision="10"/>
<xsd:element name="CategoryName" type="xsd:string" maxLength="15"/>
<xsd:element name="product" type="product_Type" minOccurs="0" maxOccurs="unbounded"/>
</xsd:complexType>
<xsd:complexType name="product_Type">
<xsd:element name="ProductName" type="xsd:string" maxLength="40"/>
<xsd:element name="ProductID" type="xsd:int" precision="10"/>
</xsd:complexType>
</xsd:schema>
1 Rows. -- 5 msec.
</programlisting>
</example>
</refsect1>
<refsect1 id="seealso_xml_auto_schema"><title>See Also</title>
<para><link linkend="fn_xml_auto"><function>xml_auto()</function></link></para>
<para><link linkend="fn_xml_auto_dtd"><function>xml_auto_dtd()</function></link></para>
</refsect1>
</refentry>
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