abap 服务器文件打开模式以及每个模式对应的代码实例
时间: 2023-10-12 18:22:44 浏览: 39
以下是ABAP服务器文件打开模式的示例代码:
1. 以二进制格式打开文件,允许读取和写入:
```
DATA: lv_file TYPE string,
lv_mode TYPE string,
lv_buffer TYPE i.
lv_file = '/usr/sap/test.txt'.
lv_mode = 'APPEND'.
lv_buffer = 1024.
OPEN DATASET lv_file FOR (lv_mode) BUFFERED BY lv_buffer.
IF sy-subrc = 0.
WRITE 'File opened successfully.'.
ELSE.
WRITE 'Failed to open file.'.
ENDIF.
```
2. 以只读模式打开文件,只允许读取文件内容:
```
DATA: lv_file TYPE string,
lv_buffer TYPE i.
lv_file = '/usr/sap/test.txt'.
lv_buffer = 1024.
OPEN DATASET lv_file FOR INPUT BUFFERED BY lv_buffer.
IF sy-subrc = 0.
WRITE 'File opened successfully.'.
ELSE.
WRITE 'Failed to open file.'.
ENDIF.
```
3. 以只写模式打开文件,如果文件不存在则创建文件,如果文件已存在则清空文件内容:
```
DATA: lv_file TYPE string,
lv_buffer TYPE i.
lv_file = '/usr/sap/test.txt'.
lv_buffer = 1024.
OPEN DATASET lv_file FOR OUTPUT BUFFERED BY lv_buffer.
IF sy-subrc = 0.
WRITE 'File opened successfully.'.
ELSE.
WRITE 'Failed to open file.'.
ENDIF.
```
4. 以追加模式打开文件,如果文件不存在则创建文件,如果文件已存在则在文件末尾添加新内容:
```
DATA: lv_file TYPE string,
lv_buffer TYPE i.
lv_file = '/usr/sap/test.txt'.
lv_buffer = 1024.
OPEN DATASET lv_file FOR APPENDING BUFFERED BY lv_buffer.
IF sy-subrc = 0.
WRITE 'File opened successfully.'.
ELSE.
WRITE 'Failed to open file.'.
ENDIF.
```
在以上示例代码中,lv_file表示文件名,lv_mode表示打开模式,lv_buffer表示缓冲区大小。如果文件打开成功,程序会输出“File opened successfully.”,否则会输出“Failed to open file.”。