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Microsoft intends to drop support for the text, ntext, and image data types in upcoming SQL Server versions. For this reason, Microsoft recommends that you stop using these data types.
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The key benefits of storing XML data in SQL Server 2005 text columns are the following:
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XML provides textual fidelity. All details such as comments and white space are preserved. It does not depend on database capabilities. It reduces the processing workload on the database server because all processing of XML data happens in a middle tier. It provides the best performance for document-level insertion and retrieval. Document-level means that if you want to execute operations at the node level, you are forced to work with the complete XML document because SQL Server is not aware of what is stored in this column.
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Some limitations of storing XML in SQL Server 2005 text columns are as follows:
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Coding complexity (and related higher maintenance cost) is added in the middle tier. You can t manipulate, extract, or modify XML data at the node level. Searching XML data always involves reading the entire document because XML is interpreted as text by the database server. XML validation, well-formedness, and type checking must be executed in the middle tier.
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Well-formed XML
Well-formed XML is an XML document that meets a set of constraints specified by the World Wide Web Consortium (W3C) Recommendation for XML 1.0. For example, well-formed XML must contain a root-level element, and any other nested elements must open and close properly without intermixing. SQL Server 2005 validates some of the well-formedness constraints. Some rules, such as the requirement for a root-level element, are not enforced. For a complete list of well-formedness requirements, read the W3C Recommendation for XML 1.0 at http://www.w3.org/TR/REC-xml.
Quick Check
1. What are two benefits of storing XML in a text column in SQL Server 2005 2. What are two disadvantages of storing XML in a text column in SQL Server 2005
Quick Check Answers
1. Possible answers include the following: XML provides textual fidelity, does not depend on database capabilities, reduces the processing workload on the database server, and provides the best performance for document-level insertion and retrieval. 2. Possible answers include the following: it s impossible to manipulate, extract, or modify the data at the node level; searching XML data always involves reading the entire document; XML validation must be executed in the middle tier; and there is extra coding complexity in the middle tier.
Storing XML in XML Data Type Columns
You can use the new XML data type in SQL Server 2005 as you use any other native SQL Server data type: to define columns on tables, to define parameters for functions and stored procedures, and to create variables. As the following code example demonstrates, the XML data type column accepts both XML documents and XML fragments; this behavior is specified in the SQL/XML ISO-ANSI Standard Part 14.
CREATE TABLE UniversalLog(recordID int, description XML) INSERT UniversalLog(recordID, description) VALUES(1, '<log><application>Sales</application><description>The connection timed out.</description></log>') INSERT UniversalLog(recordID, description) VALUES(1, 'database unavailable')
Lesson 1: Working with XML Structures
You can also use the XML data type to define parameters and variables, as the following code example demonstrates:
CREATE PROCEDURE AddRecordToLog (@record AS XML) AS -- procedure body GO DECLARE @logRecord AS XML SET @logRecord = '<log><application>Sales</ application><description>The connection timed out.</description></log>' EXEC AddRecordToLog @logRecord
SQL Server automatically converts the data types (n)char, (n)varchar, (n)text, varbinary, and image to the XML data type when assigning values to an XML parameter, column, or variable. The benefits of storing XML data by using the XML data type in SQL Server 2005 are as follows:
The XML data type is fully integrated with the SQL Server query engine and all other SQL Server services. The same query processor and query optimizer are used for both relational and XML queries. The data is stored and manipulated natively as XML. SQL Server 2005 provides fine-grained support for selecting, inserting, modifying, or deleting at the node level. Performance improves for data-retrieval operations because multiple indexing is possible with the XML data type, so SQL Server reads only relevant nodes. Document order and structure are preserved.
Limitations of storing XML using the XML data type in SQL Server 2005 include the following:
Textual fidelity is not preserved. White space, the XML declaration at the top of the document, comments in the XML, attribute ordering, and other nondata elements are removed from the structure. The maximum allowed node depth is 128 levels. The maximum allowed storage size is 2 GB.
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