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For comprehensive coverage of OPENROWSET, see the SQL Server 2005 Books Online topic OPENROWSET (Transact-SQL).
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Can OPENROWSET be used only to load data from XML files No. You can use OPENROWSET to make data from many different data providers available for use inside a query.
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In this practice, you use the OPENROWSET function in an UPDATE statement to import data from a text file that contains an XML fragment and update specific rows in the Exam table with the imported XML fragment.
IMPORTANT
Work through the Lessons 2 and 3 practices first
The necessary database, table, and files for this practice were created or copied during Practice 1, Prepare the Environment, in Lesson 2 of this chapter. Be sure to finish that exercise before attempting the following practice. Also, you need to perform at least one of the bcp or BULK INSERT import exercises before doing this practice.
1. If necessary, open SSMS and connect to the server that you are using for these exercises. 2. Open a new query window by pressing Ctrl+N. 3. Here is the base UPDATE statement you use:
UPDATE EXAM SET ExamXML = (SELECT A.Col1 FROM OPENROWSET( ) AS A(Col1)) WHERE ExamID=1
4. Try to formulate the proper OPENROWSET section of the preceding UPDATE statement. Remember that the defaults for column and row terminators are /t (tab) and /n (newline), respectively. 5. When you think you have the right command, try executing it in the SQL window. It doesn t matter if you run the command more than once, so there is no need to reset any rows between attempts, and you can always change which ExamID the statement is updating. 6. Here is the complete UPDATE statement:
UPDATE EXAM SET ExamXML = (SELECT A.Col1 FROM OPENROWSET( BULK 'c:\FileImportPractice\XMLTest.txt', SINGLE_BLOB) AS A(Col1)) WHERE ExamID=1
Lesson 4: Importing Bulk XML Data
7. If you like, the statement is also available in the OpenRowsetCommand.sql file. Simply copy the command to the SQL window and execute it, or double-click the file for a new SQL window and connection and then execute the command. You should get a message saying that a few row(s) were affected. The number of affected rows depends on how many times you ran the bcp and BULK INSERT commands in previous exercises.
Lesson Summary
The OPENROWSET function, which can be used with an OLE DB data provider, allows you to use data from a file in a query without having to load it into a table first. To import an XML file into a single column and row, use OPENROWSET with the BULK option and SINGLE_BLOB format.
Lesson Review
The following questions are intended to reinforce key information presented in this lesson. The questions are also available on the companion CD if you prefer to review them in electronic form.
NOTE
Answers
Answers to these questions and explanations of why each answer choice is right or wrong are located in the Answers section at the end of the book.
1. Which of the following are valid places to use the OPENROWSET function (Choose all that apply.) A. In the FROM clause of a query in place of a regular table B. In bcp as a data source for import into SQL Server 2005 C. In BULK INSERT as a data source for import into SQL Server 2005 D. As the target of an INSERT, UPDATE, or DELETE query
10
Working with Flat Files
Lesson 5: Using the SSIS Import/Export Wizard
The most robust way to import or export data is with SSIS. SSIS is the SQL Server 2005 successor to the popular Data Transformation Services (DTS) extraction, transformation, and loading (ETL) tool that ships as part of SQL Server 2000 and SQL Server 7.0. Exploring the full power, flexibility, and usage of SSIS are well beyond the scope of this book, but this lesson provides a basic overview of the SSIS Import/ Export Wizard as it pertains to importing a flat file.
After this lesson, you will be able to:
List ways to start the SSIS Import/Export Wizard. Explain the wizard s screens. Explain how starting the wizard from different applications alters its behavior.
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