ABAP Keyword Documentation → ABAP - Reference → Processing External Data → ABAP File Interface → Statements for the ABAP File Interface → OPEN DATASET
cOPEN DATASET - access
Other versions: 7.31 | 7.40 | 7.54
Syntax
... INPUT
| OUTPUT
| APPENDING
| UPDATE ... .
Alternatives
2. ... OUTPUT
3. ... APPENDING
4. ... UPDATE
Effect
These additions are used to open the file for reading, writing, appending, or changing. In Unicode programs, specification of the access type is obligatory.
Alternative 1
... INPUT
Effect
The addition FOR INPUT opens the file for reading. By default, the file pointer
is set at the start of the file. If the file specified does not exist, sy-subrc is set to 8.
In a Unicode program, it is not possible to obtain write access to a file that is open for reading. In a non-Unicode program write access is also permitted.
Alternative 2
... OUTPUT
Effect
The addition FOR OUTPUT opens the file for writing. If the specified file
already exists, its content is deleted. If the file specified does not exist, it is created. Read access is also permitted.
Alternative 3
... APPENDING
Effect
The addition FOR APPENDING opens the file for appending. If the file specified
already exists, it is opened and the file pointer is set at the end of the file. If the file specified
does not exist, it is created. Attempted read access to a file opened with FOR APPENDING
with the statement READ DATASET fails, and returns the value 4 for sy-subrc.
Alternative 4
... UPDATE
Effect
The addition FOR UPDATE opens the file for changes to the existing content.
By default, the file pointer is set to the start of the file. If the specified file does not exist, no file is opened and sy-subrc is set to 8.