You must indicate that a device file is a DBCS file in order for
the server to process double-byte data properly. You can indicate a DBCS file
in the ways described in this topic.
- Through DDS:
- DDS provides fields of the following data types.
- DBCS-only fields: display and accept only double-byte characters.
Double-byte characters in a DBCS-only field are enclosed in shift-out and
shift-in characters that must be paired.
- DBCS-open fields: display and accept both single-byte and double-byte
characters. Double-byte characters are enclosed in shift-out and shift-in
characters that must be paired.
- DBCS-either fields: display and accept either single-byte
or double-byte characters, but not both. Double-byte characters are
enclosed in shift-out and shift-in character pairs.
- DBCS-graphic fields: display and accept only double-byte characters.
Characters in a DBCS-graphic field do not have shift-out and shift-in characters.
The iSeries™ DBCS-graphic field
is equivalent to a System/370™ DBCS field.
- In ICF files, by defining fields with DBCS-open data type (type O).
- In printer files, by defining fields with DBCS-open data type (type O)
and DBCS-graphic data type (type G).
- In display files, by defining fields with DBCS-only data type (type J),
DBCS-either data type (type E), DBCS-open data type (type O), or DBCS-graphic
data type (type G).
- By using a double-byte literal that is used with the file at processing
time, such as literals specified with the Default (DFT) and Error Message
(ERRMSG) DDS keywords.
Note: You can also use double-byte literals as text
and comments in a file, such as with the DDS keyword TEXT. However, the server
does not consider a file, whose only DBCS usage is that it has double-byte
comments, to be a DBCS file.
- By specifying the Alternative Data Type (IGCALTTYP) DDS keyword in display
and printer files. This keyword lets you use display and printer files with
both alphanumeric and double-byte applications. When you put the IGCALTTYP
keyword into effect, you can use double-byte data with the file.
Put the
IGCALTTYP keyword into effect by creating, changing, or overriding display
and printer files with the IGCDTA(*YES) value. You can put the IGCALTTYP keyword
into effect for display and printer files by specifying IGCDTA(*YES) on the
following device file commands:
Except when using the IGCALTTYP function, you do not need
to specify IGCDTA(*YES) on the file creation command if you have already specified
DBCS functions in the DDS. Instead, specify IGCDTA(*YES) when the file has
DBCS functions that are not indicated in the DDS. For example, specify IGCDTA(*YES)
on the file creation command if the file is intended to contain double-byte
data.
- By specifying IGCDTA(*YES) on the following device file creation commands:
- By specifying IGCDTA(*YES) on the following database file creation commands: