Examples: DDS for each file type

This topic provides examples of data description specifications (DDS) for each type of file discussed in this topic. If you choose, you can use the examples in this topic with appropriate high-level language programs.

• Examples of database files include the following types:
  • Field reference file (a physical file used for reference, not data storage)
  • Physical file
  • Logical file
• Examples of device files include the following types:
  • Display file with help specifications
  • Subfile examples
  • Printer file
  • ICF file

• Example: A field reference file
  This example defines all of the fields used in an application and refers to fields only within the field reference file itself.
• Example: A physical file with a new record format
  The REF keyword is important in this example. This file has one record format. The names of all fields in the record format are specified. This example uses fields in a reference file (REF keyword) and uses a keyed-sequence access path.
• Example: A logical file specifying multiple formats and new keys
  The PFILE keyword is important in this example. The example uses new field specifications and provides two record formats. Each record format provides a different view of the associated physical file and uses a key different from the associated physical file.
• Example: A logical file specifying a new record format
  The UNIQUE keyword is important in this example. The example specifies a record format different from the associated physical file.
• Example: A join logical file
  The join logical file joins three physical files (PF1, PF2, and PF3) in this example, so that an application program can get name, address, and salary information in one input operation, even though the information is stored in three different physical files.
• Example: An inquiry display with two record formats in DDS
  The display is defined by the DDS in this example. It is displayed by output operations to the record formats PROMPT and RESPONSE.
• Example: A subfile with SFLPAG value equal to SFLSIZ value
  The display is defined by the DDS in this example. It is displayed by an output operation to the subfile control-record format SFLCTL1.
• Example: A subfile with paging by i5/OS operating system and high-level language program
  This example describes a combined method of paging a subfile that uses system resources efficiently.
• Example: A horizontal subfile displayable on two display sizes
  The two displays show the subfile defined in this example as it appears on the 24 x 80 and 27 x 132 display sizes.
• Example: A message subfile using DDS
  The display shows the message subfile defined in this example.
• Example: A printer file using DDS
  This printer file example contains DDS for printing a customer master list.
• Example: An ICF file using DDS
  This example contains DDS for transmitting data between the iSeries™ server and a remote system or device.