Display XML Schema in SQL Query Result - sql

Question

I'm brand new to SQL and SQL Server Management Studio, so bear with me. Here's a shortened version of my query:
SELECT *
FROM [dbo].[BranchLocations] WHERE NOT (PropertyOwnerType IS NULL)
FOR XML PATH('LocationData'), ROOT('MainRoot')
This gives me exactly what I need except for the schema. I don't want to automatically generate a schema because the service to which I upload the XML data only accepts a specific schema structure, and I would prefer to control it.
My schema looks similar to this:
<xs:schema id="LocationData_ds" xmlns="" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
<xs:element name="LocationData_ds" msdata:IsDataSet="true" msdata:UseCurrentLocale="true">
<xs:complexType>
<xs:choice minOccurs="0" maxOccurs="unbounded">
<xs:element name="LocationData">
<xs:complexType>
<xs:sequence>
<xs:element name="EntityID" type="xs:string" />
<xs:element name="AddressLine" type="xs:string" minOccurs="0" />
<xs:element name="Locality" type="xs:string" minOccurs="0" />
<xs:element name="AdminDistrict" type="xs:string" minOccurs="0" />
<xs:element name="PostalCode" type="xs:string" minOccurs="0" />
<xs:element name="CountryRegion" type="xs:string" minOccurs="0" />
<xs:element name="Latitude" type="xs:double" minOccurs="0" />
<xs:element name="Longitude" type="xs:double" minOccurs="0" />
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:choice>
</xs:complexType>
<xs:unique name="Constraint1" msdata:PrimaryKey="true">
<xs:selector xpath=".//LocationData" />
<xs:field xpath="EntityID" />
</xs:unique>
</xs:element>
</xs:schema>
My query returns this:
<MainRoot>
<LocationData>
<EntityID>10010000</EntityID>
<AddressLine>1234 address<\/AddressLine>
<Locality>Converse</Locality>
<AdminDistrict>TX</AdminDistrict>
<PostalCode>12345</PostalCode>
<CountryRegion>US</CountryRegion>
</LocationData>
<LocationData>
<EntityID>70390000</EntityID>
<AddressLine>1234 address<\/AddressLine>
<Locality>Denver</Locality>
<AdminDistrict>CO</AdminDistrict>
<PostalCode>12345</PostalCode>
<CountryRegion>US</CountryRegion>
</LocationData>
...
<MainRoot>
And what I need is this:
(and I need ti include<?xml version="1.0" encoding="utf-8" standalone="yes"?> at the top as well)
<?xml version="1.0" encoding="utf-8" standalone="yes"?>
<MainRoot>
<xs:schema id="LocationData_ds" xmlns="" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
<xs:element name="LocationData_ds" msdata:IsDataSet="true" msdata:UseCurrentLocale="true">
<xs:complexType>
<xs:choice minOccurs="0" maxOccurs="unbounded">
<xs:element name="LocationData">
<xs:complexType>
<xs:sequence>
<xs:element name="EntityID" type="xs:string" />
<xs:element name="AddressLine" type="xs:string" minOccurs="0" />
<xs:element name="Locality" type="xs:string" minOccurs="0" />
<xs:element name="AdminDistrict" type="xs:string" minOccurs="0" />
<xs:element name="PostalCode" type="xs:string" minOccurs="0" />
<xs:element name="CountryRegion" type="xs:string" minOccurs="0" />
<xs:element name="Latitude" type="xs:double" minOccurs="0" />
<xs:element name="Longitude" type="xs:double" minOccurs="0" />
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:choice>
</xs:complexType>
<xs:unique name="Constraint1" msdata:PrimaryKey="true">
<xs:selector xpath=".//LocationData" />
<xs:field xpath="EntityID" />
</xs:unique>
</xs:element>
</xs:schema>
<LocationData>
<EntityID>10010000</EntityID>
<AddressLine>1234 address<\/AddressLine>
<Locality>Converse</Locality>
<AdminDistrict>TX</AdminDistrict>
<PostalCode>12345</PostalCode>
<CountryRegion>US</CountryRegion>
</LocationData>
<LocationData>
<EntityID>70390000</EntityID>
<AddressLine>1234 address<\/AddressLine>
<Locality>Denver</Locality>
<AdminDistrict>CO</AdminDistrict>
<PostalCode>12345</PostalCode>
<CountryRegion>US</CountryRegion>
</LocationData>
...
<MainRoot>
Looking through the documentation has led me here:
https://learn.microsoft.com/en-us/sql/t-sql/xml/insert-xml-dml?view=sql-server-ver15
It isn't working, but I think I might be on the right track.
These answers only relate to generating a schema:
convert database table into XML schema filehow to create XML schema from an existing database in SQL Server 2008

Answer 1

declare #BranchLocations table
(
EntityId varchar(20),
AddressLine varchar(20),
Locality varchar(20),
AdminDistrict varchar(20),
PostalCode varchar(20),
CountryRegion varchar(20),
PropertyOwnerType varchar(20)
);
insert into #BranchLocations(EntityId, AddressLine, Locality, AdminDistrict, PostalCode, CountryRegion, PropertyOwnerType)
values
('10010000', '1234 address', 'Converse', 'TX', '12345', 'US', 'x'),
('70390000', '1234 address', 'Denver', 'CO', '12345', 'US', 'x');
declare #myschema xml = N'<xs:schema id="LocationData_ds" xmlns="" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
<xs:element name="LocationData_ds" msdata:IsDataSet="true" msdata:UseCurrentLocale="true">
<xs:complexType>
<xs:choice minOccurs="0" maxOccurs="unbounded">
<xs:element name="LocationData">
<xs:complexType>
<xs:sequence>
<xs:element name="EntityID" type="xs:string" />
<xs:element name="AddressLine" type="xs:string" minOccurs="0" />
<xs:element name="Locality" type="xs:string" minOccurs="0" />
<xs:element name="AdminDistrict" type="xs:string" minOccurs="0" />
<xs:element name="PostalCode" type="xs:string" minOccurs="0" />
<xs:element name="CountryRegion" type="xs:string" minOccurs="0" />
<xs:element name="Latitude" type="xs:double" minOccurs="0" />
<xs:element name="Longitude" type="xs:double" minOccurs="0" />
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:choice>
</xs:complexType>
<xs:unique name="Constraint1" msdata:PrimaryKey="true">
<xs:selector xpath=".//LocationData" />
<xs:field xpath="EntityID" />
</xs:unique>
</xs:element>
</xs:schema>';
declare #res nvarchar(max);
select #res = N'<?xml version="1.0" encoding="utf-8" standalone="yes"?>' +
(
select *
from
(
select #myschema as '*'
union all
select
(
select *
FROM #BranchLocations
WHERE PropertyOwnerType is not null
FOR XML PATH('LocationData')
)
) as src
for xml path(''), root('Mainroot')
);
--test, show result
select 1 as tag, 0 as parent,
#res+'</foo>' as 'test!1!!xmltext'
for xml explicit;
--or
select #res = null;
declare #myxml xml = ( select *
FROM #BranchLocations
WHERE PropertyOwnerType is not null
and 1=2
FOR XML PATH('LocationData'));
--null result when empty resultset from table
select #res =
N'<?xml version="1.0" encoding="utf-8" standalone="yes"?>'
+(select #myschema,#myxml for xml path(''), root('Mainroot'))
where #myxml is not null;
select #res;

Answer 2

What you are looking for is called an Inline XSD Schema.
Here is BOL link: Generate an Inline XSD Schema
Unfortunately, it is very limited: "...You can specify XMLSCHEMA only in RAW and AUTO mode, not in EXPLICIT mode...". Same with the PATH mode.
Additional limitation is that SQL Server keeps XML as UTF-16, and strips an XML prolog from any XML data type internally.
To achieve what you need everything needs to be done manually, i.e. stitch together a prolog, XML Schema, and actual XML.