Working with Flat Files in .NET framework

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Working with Flat Files
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What permissions are needed to run the following bcp command
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bcp Table1 in c:\test.txt -T -c
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First, the -T parameter instructs bcp to use a trusted connection, which means that all database work will be done using the permissions granted to the Microsoft Windows user executing the command. Second, to import data with bcp, the user must have SELECT and INSERT permissions on the target table. Finally, the defaults that are implied by the command are that triggers and constraints will be disabled; therefore, the user also needs ALTER TABLE permission.
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Importing Data by Using bcp
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In this practice, you create the necessary objects and run a bcp import to a table.
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NOTE
See the companion CD for practice files
Lessons 2, 3, and 4 in this chapter use the files in the \Practice Files\ 10 folder on the companion CD.
Practice 1: Prepare the Environment
In this practice, you create a database, a table, a folder, and a file to be used for testing purposes. The folder stores the import file and text files that contain the script to create the table and some commands that are pretyped to help you move quickly through the exercise. 1. In the root folder of the C drive, create a folder named FileImportPractice. 2. Copy all the files in the \Practice Files\ 10 folder on the companion CD to the folder you just created. 3. Open SSMS and connect to the Database Engine. 4. Create a database named FileImportDB. It does not need to be very large (10 MB should be enough), and for our learning purposes, you should configure the database to use the Simple recovery model. 5. Using Windows Explorer, in the FileImportPractice folder, double-click the ExamTableCreateScript.sql file.
Lesson 2: Running the bcp Utility
6. A Connect To Database Engine dialog box opens. Make sure that you connect to the test server in which you created the FileImportDB database. 7. Click Execute to run the script and create a table named Exam within the FileImportDB database. 8. Verify that the script ran without error and that the Exam table was created. 9. Become familiar with the ExamImportFile.txt file. (Open the file in Notepad.) It is ANSI character data, with four columns separated (delimited) by tabs, and rows delimited by the newline character. Also note that the fourth column is always empty (NULL in our case). You will use the fourth column in a later practice. The four columns in the file are ExamID, ExamName, ExamDescription, and ExamXML, in that order. 10. Don t open any of the bcp, BulkInsert, or OpenRowSet command files yet. They are included in case you have difficulty in later practices.
Practice 2: Run bcp
In this practice, you run the bcp command to import 500 rows into the new Exam table that you created in Practice 1. 1. Open Notepad. 2. Try to formulate the proper bcp command to copy the ExamImportFile.txt into the FileImportDB..Exam table. Remember that the defaults for column and row terminators are /t (tab) and /n (newline), respectively. 3. When you think you have the right command, paste it into a command prompt and run it. It doesn t matter if the data is imported more than once, so you do not need to clear the table between attempts. 4. Hints: If you are having trouble, remember that there are actually several ways to form the bcp command properly. However, the quickest is to use the -c parameter, which means that the import file is character data and defaults to using /t (tab) and /n (newline) as column and row terminators. 5. You also need to specify how to connect to the SQL Server. The easiest and best way to do this is to simply use the -T parameter, which instructs bcp to connect using a trusted connection (Windows Authentication). 6. Therefore, here is the simplest command:
bcp FileImportDB..Exam in "c:\FileImportPractice\ExamImportFile.txt" -T -c
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Working with Flat Files
7. If you like, the command is also available in the bcpImportCommand.txt file. Simply copy it to the command prompt and run it. You should get a message saying that 500 rows were imported. The message also tells you how long the import took and how many rows per second it extrapolates to.
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