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Select a different folder than the one containing the original file.
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15. Click OK and the BLOB is retrieved from the database and written out to the file location specified. Navigate to the folder you selected and verify that the file is there.
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Even though the sample indicates that you should save a document, you can actually select and save any binary file into the database.
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BLOBs are large binary objects that may need to be saved and retrieved from a database. BLOBs typically need to be transferred in sections rather than as one big piece. DataReaders can read large binary objects as well as standard data types.
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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.
6
Working with Data in a Connected Environment
NOTE
Answers
Answers to these questions and explanations of why each choice is correct or incorrect are located in the Answers section at the end of the book.
1. Why is moving BLOB data to and from a database more complex than manipu lating standard data types (Choose all that apply.) A. Because BLOB data typically is transferred with a stream object B. Because BLOB data is not in a readable format C. Because BLOB data tends to be large and typically needs to be transferred in smaller pieces D. Because BLOB data cannot be read into a DataReader 2. How do you configure a command to return binary large objects A. By setting its Connection property to read binary data B. By calling the ExecuteNonQuery method and reading the results into a BinaryReader C. By calling the ExecuteReader method and casting the DataReader to a BufferedStream D. By setting the CommandBehavior to SequentialAccess in the ExecuteReader methods constructor 3. How do you transfer the individual chunks of binary data returned in a DataReader into a byte array A. Call the DataReader.GetData method and add the results to the byte array. B. Call DataReader.Read and access the bytes through a column ordinal. C. Call the DataReader.GetBytes method and add the results to the byte array. D. Call the DataReader.GetSqlByte method and add the results to the byte array.
Lesson 4: Performing Bulk Copy Operations
Lesson 4: Performing Bulk Copy Operations
This lesson describes how to copy large amounts of data quickly, using the SqlBulkCopy object provided by the System.Data.SqlClient namespace and the BULK INSERT SQL statement in SQL Server. In addition to performing an individual bulk copy opera tion, you will also learn how to perform a set of bulk copy operations wrapped within a transaction.
After this lesson, you will be able to:
Perform bulk copy operations to copy data to SQL Server (4.1.19.1). Perform bulk copy operations in transactions (4.1.19.2). Execute the SQL Server Transact-SQL BULK INSERT statement by using the SqlCommand object (4.1.19.3).
Estimated lesson time: 45 minutes
Why Perform Bulk Copies
Copying large amounts of data from one database table to another (or from a file to a database table) can take a lot of time and resources if you simply create an application that reads individual rows out of the original data source and then insert the individ ual rows into the destination data source. To accomplish the task of moving many records (or entire tables) of data, use the .NET Framework and SQL Server bulk copy features, which perform the transfer of the bulk copies more efficiently than transfer ring individual records.
Lab: Bulk Copying
In this lab you will bulk copy data from one table to another.
Creating Tables to Copy Data into
To demonstrate how to perform a bulk copy operation, you need tables to copy data into. A quick way to create the tables is to use Server Explorer and the Visual Database Tools to do some cutting and pasting! Use the following steps to create CustomerHis tory and OrderHistory tables, which you will use to bulk copy the Customer and Order table data into. 1. In Server Explorer, expand the Tables node for the Northwind database. 2. Right-click the Customers table and select Open Table Definition.
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