Working with Flat Files in .NET

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Working with Flat Files
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bcp Command-Line Syntax
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The syntax for the bcp command is as follows:
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bcp {[[database_name.][owner].]{table_name | view_name} | "query"} {in | out | queryout | format} data_file [-mmax_errors] [-fformat_file] [-x] [-eerr_file] [-Ffirst_row] [-Llast_row] [-bbatch_size] [-n] [-c] [-w] [-N] [-V (60 | 65 | 70 | 80)] [-6] [-q] [-C { ACP | OEM | RAW | code_page } ] [-tfield_term] [-rrow_term] [-iinput_file] [-ooutput_file] [-apacket_size] [-Sserver_name[\instance_name]] [-Ulogin_id] [-Ppassword] [-T] [-v] [-R] [-k] [-E] [-h"hint [,...n]"]
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As you can see, there are many parameters and options. The following discussion centers on the most frequently used bcp parameters.
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bcp parameters
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For a full description of all the parameters available for bcp, see the SQL Server 2005 Books Online topic bcp Utility. SQL Server 2005 Books Online is installed as part of SQL Server 2005. Updates for SQL Server 2005 Books Online are available for download at www.microsoft.com/technet/ prodtechnol/sql/2005/downloads/books.mspx.
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Flat files can come in many formats: with or without header rows, varying field delimiters or row delimiters, and so on. Some of the parameters that help with these variances are -t, -r, and -F.
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IMPORTANT
Parameters are case-sensitive
Note that bcp parameters are case-sensitive. Therefore, -t and -T are different and unrelated parameters.
-t defines the column delimiter or field t erminator. The default for this parameter is \t (tab character), or tab delimited. If you are familiar with importing and exporting files in Microsoft Office Excel, you are probably familiar with tab-delimited files. -r defines the r ow delimiter or r ow terminator. The default for this parameter is \n (newline character). -F defines the number of the F irst row to import from the data file. This parameter can be useful in many ways, including telling bcp to skip the first row because it is the file header. You can also use -F in a case in which part of a file has been processed and you want to restart processing where it left off.
Lesson 2: Running the bcp Utility
NOTE
Most common bcp parameters
The bcp parameters -t, -r, and -F are the most commonly used parameters for bulk importing an ASCII character file.
bcp Hint Parameter
In addition to the previously mentioned commonly used bcp parameters, the -h or h int parameter can have a substantial impact on both performance and logging overhead of the data-load operation. Unlike some of the other bcp parameters, you use the -h parameter to specify a set of hints for use during the bulk import. There are several hints you can use, including TABLOCK and ORDER. You use the TABLOCK hint to tell the bcp command to use a table lock while loading data into the destination table. As noted before, using a table lock decreases locking overhead and allows the Bulk-Logged recovery model to perform minimal logging. Use the ORDER hint to specify that the records in the data file are ordered by certain columns. If the order of the data file matches the order of the clustered index of the destination table, bulkimport performance is enhanced. If the order of the data file is not specified or does not exactly match the ordering of the clustered index of the destination table, the ORDER hint is ignored.
Exam Tip
The Hint parameter applies only to importing data from a file to a table. When used with out, queryout, or format, the Hint parameter is ignored.
Exam Tip
Both the bcp TABLOCK and ORDER hints are important for import performance. But ORDER is useful only if it exactly matches the sort order of the destination table s clustered index.
bcp Permissions
The minimum security permissions a user needs to successfully import data to a table by using bcp are the SELECT/INSERT permissions. However, unlike SQL Server 2000, SQL Server 2005 requires that the user have ALTER TABLE permissions to suspend trigger execution, to suspend constraint checking, or to use the KEEPIDENTITY option.
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