Managing XML Data in Visual Studio .NET

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Managing XML Data
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1. Which of the following INSERT statements will fail (Choose all that apply.) A. INSERT UniversalLog(recordID, description) VALUES (1, '<ROOT/>') B. INSERT UniversalLog(recordID, description) VALUES (1, 'ROOT') C. INSERT UniversalLog(recordID, description) VALUES (1, '<ROOT>') D. INSERT UniversalLog(recordID, description) VALUES (1, '<ROOT> <A><b></a></B></ROOT>')
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1. Will succeed: Represents a single-node XML document. 2. Will succeed: Represents an XML fragment. 3. Will fail: SQL Server validates the well-formedness of the XML document. The <ROOT> node is opened but never closed. 4. Will fail: SQL Server validates the well-formedness of the XML document. The hierarchy constructed by the A and B nodes is not closed properly. Also, XML is case sensitive, so the A node is not the same as the a node.
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Typing and Validating XML Data with XML Schemas
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An XML schema describes the structure and constrains the contents of XML documents. Additionally, XML schemas provide type information that describes the nature of the data in elements and attributes. SQL Server 2005 supports untyped XML data and typed XML data. By binding an XML data type variable, column, or parameter to an XML schema, SQL Server gets input that lets it validate the correctness of the XML instance and to strongly type the nodes and contents of the XML instance. If an XML document conforms to what is declared inside an XML schema, the XML document is said to be valid. An invalid XML document does not conform to what is declared inside an XML schema. XML schemas are declared at the database level and deployed to SQL Server. XML schemas are valuable to SQL Server because they provide metadata that defines and constrains XML data types. After creating the XML schema as the following code shows, you can type and validate any XML data type column, variable, or parameter according to the XML schema collection.
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Lesson 1: Working with XML Structures
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Creating an XML Schema in SQL Server 2005
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CREATE XML SCHEMA COLLECTION LogRecordSchema AS '<schema xmlns="http://www.w3.org/2001/XMLSchema"> <element name="log"> <complexType> <sequence> <element name="application" type="string"/> <element name="description" type="string"/> </sequence> </complexType> </element> </schema>'
In the following code example, SQL Server validates the contents of the @myXML variable by the rules specified in all the XML schemas that compose the LogRecordSchema schema collection:
DECLARE @myXML AS XML(LogRecordSchema) SET @myXML = '<log><date>2005-11-07</date></log>'
The assignment in the example fails because the XML instance does not conform to the XML structure declared by the XML schema collection.
NOTE
Loading an XML schema from a file
In most cases, instead of retyping the complete XML schema, it is easier to load it from an XML schema file (extension .xsd). Use the OPENROWSET command in SQL Server 2005 to load the file into a variable of type XML:
DECLARE @schema XML SELECT @schema = c FROM OPENROWSET ( BULK 'MyXMLSchema.xsd', SINGLE_BLOB) AS TEMP(c) CREATE XML SCHEMA COLLECTION MySchema AS @schema
PRACTICE
Creating a New Database
In this practice, you will create a new database. In the database, you will create a new XML schema collection, loading it from an .xsd file. Then, you will create a table with columns of XML data type and constrain the XML columns to the XML schema collection. Finally, you will load data into the table. This database is the basic database you will use in the other lessons in this chapter.
NOTE
Code available on the companion CD
The practices for this chapter are code intensive. So that you don t have to type in the code examples in the practices, the Practice Files\8 folder provides the code needed for all the practices in this chapter. For solutions to the exercises in the Lesson 1 practice, see the Practice Files\8\Lesson 1\CompleteLesson1.sql file on the CD.
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Managing XML Data
Practice 1: Create the TK4318 Database, UniversalLog Table, and XML Schema
In this exercise, you will create the necessary database schema elements to support typed XML data inside a database. 1. Open SQL Server Management Studio (SSMS) and open a connection to SQL Server 2005. 2. Issue a CREATE DATABASE statement to create a new database called TK4318.
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