RTTI: Get length of a character column
For retrieving the type of a given DDIC type only known at runtime, use the method DESCRIBE_BY_NAME
. The RTTI length is always returned as a number of bytes.
Example to get the type of the column CARRID of table SFLIGHT (I know it's a column of 3 characters) :
cl_abap_typedescr=>describe_by_name(
EXPORTING
p_name = 'SFLIGHT-CARRID'
RECEIVING
p_descr_ref = DATA(lo_typedescr)
EXCEPTIONS
type_not_found = 1 ).
" you should handle the error if SY-SUBRC <> 0
" Because it's SFLIGHT-CARRID, I expect 6 BYTES
ASSERT lo_typedescr->length = 6. " 3 characters * 2 bytes (Unicode)
" Length in CHARACTERS
CASE lo_typedescr->type_kind.
WHEN lo_typedescr->typekind_char
OR lo_typedescr->typekind_num
OR lo_typedescr->typekind_date
OR lo_typedescr->typekind_time
OR lo_typedescr->typekind_string.
DATA(no_of_characters) = lo_typedescr->length / cl_abap_char_utilities=>charsize.
ASSERT no_of_characters = 3.
ENDCASE.