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As we discussed in the section What is XQuery SQL Server s xml data type exposes several methods that allow you to query and manipulate XML data using XQuery. The .query() method is the most basic xml data type method. It accepts an XQuery expression and returns an XML result. Consider listing 4, which creates an xml data type variable, assigns an XML document to it, and then queries the document using the xml data type .query() method. The result is shown in figure 3.

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With the possible exception of the Japanese-format properties, most of the properties of the contact object are useful in everyday situations Now that you ve memorized that little list, here are examples of working with contacts

DECLARE @x xml; SET @x = N'< xml version = "1.0" > <definitions category = "Business Intelligence"> <concept> <name>star schema</name> <definition> The star schema (sometimes referenced as star join schema) is the simplest style of data warehouse schema. The star schema consists of a few "fact tables" (possibly only one, justifying the name) referencing any number of "dimension tables". The star schema is considered an important special case of the snowflake schema. </definition> <source>Wikipedia</source> </concept> <concept> <name>snowflake schema</name> <definition> A snowflake schema is a logical arrangement of tables in a relational database such that the entity relationship diagram resembles a snowflake in shape. Closely related to the star schema, the snowflake schema is represented by centralized fact tables which are connected to multiple dimensions. In the snowflake schema, however, dimensions are normalized into multiple related tables whereas the star schema's dimensions are denormalized with each dimension being represented by a single table. </definition>

<source>Wikipedia</source> </concept> </definitions>'; SELECT @x.query(N'/definitions/concept[2]/name');

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To create a new contact, use a make new contact command The easiest way to set most of the properties for the contact is by using the with properties parameter and specifying each property for which you want to set a value, like this:

As you can see, the XQuery path expression follows the hierarchical structure of the XML document. The first step of the path expression starts at the root of the XML document and then looks below to the <definitions> element. The second step uses a numeric predicate [2], indicating that the second occurrence of the <concept> element should be selected. Finally, the last step of the path expression indicates that the <name> element under the <concept> element should be retrieved. The .value() method accepts both a path expression and a SQL Server data type. It returns a single scalar value from the XML data, cast to the appropriate data type. The SELECT query in listing 5 uses the .value() method on Figure 4 Single scalar the xml data type variable defined in listing 4. The result value returned by the .value() method is shown in figure 4.

make new contact with properties {first name:"Estelle", last name:"Kalamand", nickname:"Stella", title:"Dr", business phone number:"510-555-8280"}

SELECT @x.value(N'(/definitions/concept[2]/name)[1]', N'nvarchar(100)');

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The entire path expression is wrapped in parentheses in this example, and a numeric predicate of [1] is used on the entire path expression. This ensures that only a single scalar value is returned. The .value() method will not accept any path expression that isn t guaranteed, during the pre-execution static analysis phase of processing, to return a single scalar value.

You can also assign the new contact to a variable and then use that variable to set properties, as in this example:

XQuery uses two-phase processing. Initially there s a static analysis phase, during which XQuery checks syntax, data typing, and conformance to any special requirements (such as returning only a single node or single scalar value when necessary). XQuery performs pessimistic static type checking, meaning that it ll throw errors during the static analysis phase whenever the path expression could potentially generate a static type error. After the static analysis phase, XQuery goes into the execution phase, where your path expression is evaluated against your data.

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