判断function的参数是否被实参赋值- IS SUPPLIED
ABAP语言中的IS SUPPLIED是用来判断function的输入参数是否被实参赋值，简单说来就是判断参数是否传入。
下面用一个例子来说明：
SE37创建一个Function，如下：
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FUNCTION ztest_supplied . *"---------------------------------------------------------------------- *"*"Local Interface: *" IMPORTING *" REFERENCE(I_NAME) TYPE UNAME OPTIONAL *"----------------------------------------------------------------------
IF i_name IS NOT SUPPLIED. WRITE:/ 'Import parameter I_NAME is not SUPPLIED'. ELSE. WRITE:/ 'Import parameter I_NAME is SUPPLIED'. ENDIF. IF i_name IS INITIAL. WRITE:/ 'I_NAME is initial'. ELSE. WRITE:/ 'I_NAME = ', i_name. ENDIF.
ENDFUNCTION. |
其中参数I_NAME是optional的
SE38，创建一个report来调用上面的function，如下：
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REPORT ztest_supplied.
WRITE:/ '1st call:'. CALL FUNCTION 'ZTEST_SUPPLIED' * EXPORTING * I_NAME = . SKIP. WRITE:/ '2nd call:'. CALL FUNCTION 'ZTEST_SUPPLIED' EXPORTING i_name = 'BaiduSAP.com'.
SKIP. WRITE:/ '3rd call:'. CALL FUNCTION 'ZTEST_SUPPLIED' EXPORTING i_name = ''. |
运行结果：
以上。