Practice 2 in Visual Studio .NET

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Practice 2
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Create an annotated XML schema. Then create an updategram to insert new nodes, update existing nodes, and delete nodes. Use the SQLXML API to execute the updategram.
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Converting Between XML Data and Relational Data
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For this task, you should complete Practice 1 to practice using the nodes() method of the XML data type. If you want a more well-rounded understanding of using the nodes() method, you should also complete Practice 2. Practice 3 covers using the SQLXML Bulkload API to insert an XML document in the database.
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Practice 1
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Use the OPENXML Transact-SQL instruction and the XML stored procedures to load an existing XML document and insert the data into a database. Use different sample XML documents one with an element-centric structure, another with an attribute-centric structure, and another combining elements and attributes in a complex nesting structure.
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8 Review
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Practice 2
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Create an XML data type variable and then use the nodes() method to execute an XQUERY expression. Extract the resulting data by using the value() method. Create a new table and create a column of the XML data type. Load the column with data and then use the nodes() method to execute an XQUERY expression. Extract the resulting data by using the value() method. Remember that you must use the APPLY operators.
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Practice 3
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Using the XML document from Practice 1, write a .NET application that uses the SQXML Bulkload API to insert the XML document into a database. Remember that you must write an annotated XSD schema.
Creating XML Indexes
For this task, complete all three practices to get a well-rounded understanding of indexing options.
Practice 1
Create a complex XQUERY expression and execute it by using the query() method of the XML data type. The XQUERY expression must filter the data by its structure for example, by querying if an attribute appears in the XML structure. Time the execution as you process a fairly large amount of XML data. Create an XML PATH index, reexecute the query, and time it again.
Practice 2
Create a complex XQUERY expression, and execute it by using the query() method of the XML data type. The XQUERY expression must filter the data by its content for example, by querying the value of an existing attribute that appears in the XML structure. Do not fully specify the path to the attribute; instead, use //. Time the execution as you process a fairly large amount of XML data. Create an XML VALUE index, reexecute the query, and then time it again.
Practice 3
Create a complex XQUERY expression, and execute it by using the value() method of the XML data type and filtering by the table s primary key. The
8 Review
XQUERY expression must filter the data by its content for example, by querying the value of an existing attribute that appears in the XML structure. Time the execution as you process a fairly large amount of XML data.
Create an XML PROPERTY index, reexecute the query, and then time it again.
Take a Practice Test
The practice tests on this book s companion CD offer many options. For example, you can test yourself on just the content covered in this chapter, or you can test yourself on all the 70-431 certification exam content. You can set up the test so that it closely simulates the experience of taking a certification exam, or you can set it up in study mode so that you can look at the correct answers and explanations after you answer each question.
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Practice tests
For details about all the practice test options available, see the How to Use the Practice Tests section in this book s Introduction.
9
Creating Functions, Stored Procedures, and Triggers
SQL Server provides three types of programmable objects: functions, stored procedures, and triggers. Instead of executing a single statement or command, these objects support the creation of rich programming logic, including looping, flow control, decision making, and branching. In addition to the built-in set of functions in SQL Server, you can create user-defined functions (UDFs) to encapsulate commonly used code for reuse in multiple programs. You use stored procedures, which are saved batches of code, as the interface for all application access to a database, letting you control data access and ease maintenance by avoiding hard-coding SQL into applications. And you use triggers to automatically execute code in response to certain database events. New in SQL Server 2005, you can write the code for each of these objects by using either Transact-SQL or a Microsoft .NET Framework supported language such as C# or Visual Basic.
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