Editors for flat files

At this point, in the Flat File Connection Manager Editor, name your connection Products Flat File Destination , and pick a location and name for your file and enter it in the Filename window, such as Any of these can be selected if you intend to send the file to another machine that will consume the data in a different format.

Change the Code page to UTF-8 , which should be the last one on the list. Switch to the Advanced property page on the left, which displays a list of the columns that the Flat File Destination adapter received from the upstream transformation in this case the Source adapter.

Finally, in the Flat File Destination Editor, click the Mappings property page on the left, which by default maps the input columns to the columns created in the destination file. When this is checked, the file will be cleared before data is loaded in the Data Flow. If this is unchecked, then data will be appended to the file.

Run this simple package, which will create the flat file and overwrite any data that previously existed. Now that you have created and loaded a flat file, the next task is to understand how to extract data from a flat file. Of course, when you are working in your work environment, the first step in extracting data from a flat file is to make sure you have access to the file and you somewhat understand how the data is structured.

In this example, you will be working with a fixed-width file created in the prior example, encoded in UTF-8 code page format. The file contains a list of AdventureWorks products.

Connecting to a flat file requires using a package connection. Flat File Connection Manager Editor. Name the connection Products File Source in the Connection manager name text box.

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For more information about the properties that you can set in the Advanced Editor dialog box or programmatically, click one of the following topics:. Common Properties. Flat File Custom Properties. For details about how to set properties of a data flow component, see Set the Properties of a Data Flow Component. The Flat File source reads data from a text file, which can be in a delimited, fixed width, or mixed format. A Flat File connection manager if the source is a single flat file.

A Multiple Flat Files connection manager if the source is multiple flat files and the Data Flow task is inside a loop container, such as the For Loop container. On each loop of the container, the Flat File source loads data from the next file name that the Multiple Flat Files connection manager provides.

Flat file connection manager Select an existing connection manager from the list, or create a new connection manager by clicking New. Retain null values from the source as null values in the data flow Specify whether to keep null values when data is extracted.

The default value of this property is false. When this value is f alse , the Flat File source replaces null values from the source data with appropriate default values for each column, such as empty strings for string columns and zero for numeric columns. Preview Preview results by using the Data View dialog box. Preview can display up to rows. Use the Columns node of the Flat File Source Editor dialog box to map an output column to each external source column.

Available External Columns View the list of available external columns in the data source. You cannot use this table to add or delete columns. External Column View external source columns in the order in which the task will read them.