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13 XML and XQuery
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-- Auxiliary tables CREATE TABLE dbo.Beverages ( percentvitaminsRDA INT ); CREATE TABLE dbo.Condiments ( shortdescription NVARCHAR(50) ); GO -- Store the Schemas in a Variable and Create the Collection DECLARE @mySchema NVARCHAR(MAX); SET @mySchema = N''; SET @mySchema = @mySchema + (SELECT * FROM Beverages FOR XML AUTO, ELEMENTS, XMLSCHEMA('Beverages')); SET @mySchema = @mySchema + (SELECT * FROM Condiments FOR XML AUTO, ELEMENTS, XMLSCHEMA('Condiments')); SELECT CAST(@mySchema AS XML); CREATE XML SCHEMA COLLECTION dbo.ProductsAdditionalAttributes AS @mySchema; GO -- Drop Tables DROP TABLE dbo.Beverages, dbo.Condiments; GO
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I added a SELECT statement to show you the schema collection I am creating . Note that each schema in the collection has its own target namespace, defined in the XMLSCHEMA directive of the FOR XML clause . Therefore, here is the schema collection I created:
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<xsd:schema xmlns:schema="Beverages" xmlns:xsd="http://www.w3.org/2001/ XMLSchema" xmlns:sqltypes="http://schemas.microsoft.com/sqlserver/2004/sqltypes" targetNamespace="Beverages" elementFormDefault="qualified"> <xsd:import namespace="http://schemas.microsoft.com/sqlserver/2004/sqltypes" schemaLocation="http://schemas.microsoft.com/sqlserver/2004/sqltypes/sqltypes.xsd" /> <xsd:element name="Beverages"> <xsd:complexType> <xsd:sequence> <xsd:element name="percentvitaminsRDA" type="sqltypes:int" minOccurs="0" /> </xsd:sequence> </xsd:complexType> </xsd:element> </xsd:schema> <xsd:schema xmlns:schema="Condiments" xmlns:xsd="http://www.w3.org/2001/ XMLSchema" xmlns:sqltypes="http://schemas.microsoft.com/sqlserver/2004/sqltypes" targetNamespace="Condiments" elementFormDefault="qualified"> <xsd:import namespace="http://schemas.microsoft.com/sqlserver/2004/sqltypes" schemaLocation="http://schemas.microsoft.com/sqlserver/2004/sqltypes/sqltypes.xsd" /> <xsd:element name="Condiments"> <xsd:complexType> <xsd:sequence> <xsd:element name="shortdescription" minOccurs="0"> <xsd:simpleType>
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Inside Microsoft SQL Server 2008: T-SQL Programming
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<xsd:restriction base="sqltypes:nvarchar" sqltypes:localeId="1033" sqltypes:sqlCompareOptions="IgnoreCase IgnoreKanaType IgnoreWidth" sqltypes:sqlSortId="52"> <xsd:maxLength value="50" /> </xsd:restriction> </xsd:simpleType> </xsd:element> </xsd:sequence> </xsd:complexType> </xsd:element> </xsd:schema>
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You can get information about schema collections by querying the catalog views sys.xml_schema_collections, sys.xml_schema_namespaces, sys.xml_schema_components, and some others . However, a schema collection is stored in SQL Server in tabular format, not in XML format . It would make sense to perform the same schema validation on the client side as well; why would you send data to the server side if the RDBMS will reject it You can perform schema collection validation in .NET code as well, as long as you have the schemas . Therefore, it makes sense to also save the schemas you create with T-SQL as files in the file system for this purpose . In SQL Server, as I mentioned, you can browse catalog views to get schema collection information:
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-- Retrieve information about the schema collection SELECT * FROM sys.xml_schema_collections WHERE name = 'ProductsAdditionalAttributes'; -- Retrieve information about the namespaces in the schema collection SELECT N.* FROM sys.xml_schema_namespaces AS N JOIN sys.xml_schema_collections AS C ON N.xml_collection_id = C.xml_collection_id WHERE C.name = 'ProductsAdditionalAttributes'; -- Retrieve information about the components in the schema collection SELECT CP.* FROM sys.xml_schema_components AS CP JOIN sys.xml_schema_collections AS C ON CP.xml_collection_id = C.xml_collection_id WHERE C.name = 'ProductsAdditionalAttributes';
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The next step is to alter the XML column from a well-formed state to a schema-validated one:
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ALTER TABLE Production.Products ALTER COLUMN additionalattributes XML(dbo.ProductsAdditionalAttributes);
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Note When you change an XML column from well formed to schema-validated, all values in
that column are validated, so the alteration can take a while .
Before using the new data type, I have to take care of one more issue . How do I prevent binding the wrong schema to a product of a specific category For example, how do I prevent binding a condiments schema to a beverage I want to have a declarative
13 XML and XQuery
constraint namely, a check constraint . This is why I added namespaces to my schemas . I am going to check whether the namespace is the same as the product category name . You cannot use XML data type methods inside constraints . This is why I have to create two additional functions: one retrieves the XML namespace of the additionalattributes XML column; and the other retrieves the category name of a product . In the check constraint, I ll check whether the return values of both functions are equal:
-- Function to retrieve the namespace CREATE FUNCTION dbo.GetNamespace(@chkcol XML) RETURNS NVARCHAR(15) AS BEGIN RETURN @chkcol.value('namespace-uri((/*)[1])','NVARCHAR(15)') END; GO -- Function to retrieve the category name CREATE FUNCTION dbo.GetCategoryName(@catid INT) RETURNS NVARCHAR(15) AS BEGIN RETURN (SELECT categoryname FROM Production.Categories WHERE categoryid = @catid) END; GO -- Add the constraint ALTER TABLE Production.Products ADD CONSTRAINT ck_Namespace CHECK (dbo.GetNamespace(additionalattributes) = dbo.GetCategoryName(categoryid));
Now insert some valid data:
-- Beverage UPDATE Production.Products SET additionalattributes = N' <Beverages xmlns="Beverages"> <percentvitaminsRDA>27</percentvitaminsRDA> </Beverages>' WHERE productid = 1; -- Condiment UPDATE Production.Products SET additionalattributes = N' <Condiments xmlns="Condiments"> <shortdescription>very sweet</shortdescription> </Condiments>' WHERE productid = 3;
Finally, I have to determine whether the XML schema validation and the check constraint work . I ll try to insert some invalid data:
-- String instead of int UPDATE Production.Products SET additionalattributes = N'
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