Lesson 3: Performing a BULK INSERT Task in VS .NET

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Lesson 3: Performing a BULK INSERT Task
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You can also include the TABLOCK hint by appending WITH (TABLOCK) to the end of the command. 7. If you like, the command is also available in the BulkInsertCommand.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; then execute the command. You should get a message saying that 500 row(s) were affected.
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The BULK INSERT Transact-SQL command is the in-process brother to bcp. BULK INSERT has similar arguments to bcp, but they are less cryptic. The BULK INSERT permissions have changed from SQL Server 2000 to SQL Server 2005. Similar to bcp, certain hints, such as TABLOCK, must be used with BULK INSERT for minimal logging to occur.
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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.
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Answers
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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.
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1. When loading data from a file by using BULK INSERT on a SQL Server 2005 instance that uses only Windows Authentication, file access permissions are verified based on which user s credentials A. The user account that the SQL Server service is running as. B. The user account of the person executing the BULK INSERT command. C. The user account of the SQL Server Agent service. D. File permissions are ignored because a program, not a person, is trying to access the file.
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10
Working with Flat Files
Lesson 4: Importing Bulk XML Data
SQL Server provides several options for importing XML documents. You can use the OPENROWSET Transact-SQL function to read data, including XML data, from a file. SQL Server also offers OPENXML and XML stored procedures; the XML data type s nodes() method; or the SQLXML middle-tier API to load XML data as relational data, a process called shredding. Lesson 5 of 8, Managing XML Data, covers the shredding methods for loading XML data. This lesson discusses using the BULK rowset provider for OPENROWSET to read data from a file without having to load the data into a target table. With this method, you can use OPENROWSET with a simple SELECT statement.
After this lesson, you will be able to:
List the main uses of the OPENROWSET function. Load an XML file into a table by using the OPENROWSET function. Explain some of the options and parameters of the OPENROWSET function.
Estimated lesson time: 10 minutes
OPENROWSET Function
You can use the OPENROWSET function in any standard SQL statement as a table reference, thus enabling you to use data from any valid OLE DB data source in a query without first having to load it into a table. The syntax of the function is the following:
OPENROWSET ( { 'provider_name' , { 'datasource' ; 'user_id' ; 'password' | 'provider_string' } , { [ catalog. ] [ schema. ] object | 'query' } | BULK 'data_file' , { FORMATFILE = 'format_file_path' [ <bulk_options> ] | SINGLE_BLOB | SINGLE_CLOB | SINGLE_NCLOB } } ) <bulk_options> ::= [ , CODEPAGE = { 'ACP' | 'OEM' | 'RAW' | 'code_page' } ] [ , ERRORFILE = 'file_name' ] [ , FIRSTROW = first_row ] [ , LASTROW = last_row ] [ , MAXERRORS = maximum_errors ] [ , ROWS_PER_BATCH = rows_per_batch ]
Lesson 4: Importing Bulk XML Data
There are many uses of the OPENROWSET function, including using the function as a target of an INSERT, UPDATE, or DELETE query. For example, you can use this function to make a flat file appear to be a table and then you can treat the file as a table by using joins, WHERE clauses, SELECT statements, and so on without having to load the data in a table first. Or you can use OPENROWSET with a different data provider to allow a SQL query to see data in an Analysis Services Measure Group as a flattened table, and all the same uses apply. However, the focus of this chapter and lesson is importing data from files. To use OPENROWSET to bulk load XML data, you use the BULK option, which lets you specify where to start and end reading data, how to deal with errors, and how to interpret data. For example, when importing a single XML document into a column of one row, you specify the BULK option along with the SINGLE_BLOB format. A sample statement to perform this task is the following:
INSERT INTO Documents(XmlCol) SELECT * FROM OPENROWSET( BULK 'c:\XMLDocs\XMLDoc9.txt', SINGLE_BLOB) AS x
This statement bulk imports the contents of the c:\XMLDocs\XMLDoc9.txt file as a SINGLE_BLOB and inserts that BLOB into the XmlCol of a single row in the Documents table. The SINGLE_BLOB format tells the OPENROWSET function to treat the entire file as a single unit, rather than parsing it in some way.
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