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For example, to uncompress a data file and use the uncompressed data as the source data input rows, use the following command: uncompress -c $PMSourceFileDir/myCompressedFile.Z
The command uncompresses the file and sends the standard output of the command to the flat file reader. The flat file reader reads the standard output of the command as the flat file source data.
Generating a File List
Use a command to generate a list of source files. The flat file reader reads each file in the list when the session runs. Use a command to generate a file list when the list of source files changes often or you want to generate a file list based on specific conditions. You might want to use a command to generate a file list based on a directory listing.
For example, to use a directory listing as a file list, use the following command: cd $PMSourceFileDir; ls -1 sales-records-Sep-*-2005.dat
The command generates a file list from the source file directory listing. When the session runs, the flat file reader reads each file as it reads the file names from the command.
To use the output of a command as a file list, select Command as the Input Type, Command generating file list as the Command Type, and enter a command for the Command property.
Configuring Fixed-Width File Properties
When you read data from a fixed-width file, you can edit file properties in the session, such as the null character or code page. You can configure fixed-width properties for non-reusable sessions in the Workflow Designer and for reusable sessions in the Task Developer. You cannot configure fixed-width properties for instances of reusable sessions in the Workflow Designer.
Click Set File Properties to open the Flat Files dialog box. To edit the fixed-width properties, select Fixed Width and click Advanced. The Fixed Width Properties dialog box appears. By default, the Workflow Manager displays file properties as configured in the mapping. Edit these settings to override those configured in the source definition.
The following table describes options you can define in the Fixed Width Properties dialog box for file sources:
Fixed-Width Properties
Options
Description
Text/Binary
Repeat Null Character
Indicates the character representing a null value in the file. This can be any valid character in the file code page, or any binary value from 0 to 255. For more information about specifying null
characters, see “Null Character Handling” on page 70.
If selected, the Integration Service reads repeat null characters in a single field as a single null value. If you do not select this option, the Integration Service reads a single null character at the beginning of a field as a null field.
Important: For multibyte code pages, specify a single-byte null character if you use repeating nonbinary null characters. This ensures that repeating null characters fit into the column.
Code Page Code page of the fixed-width file. Select a code page or a variable:
- Code page. Select the code page.
- Use Variable. Enter a user-defined workflow or worklet variable or the session parameter
$ParamName, and define the code page in the parameter file. Use the code page name.
Default is the PowerCenter Client code page.
66 Chapter 6: Sources
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