To use variable name as field name

[sankar1781]

Hi Experts, 

I read the below thread but that goes with a structure and fieldcat methodology that will not suit my requirement. 

https://community.sap.com/t5/application-development-discussions/how-to-use-variable-as-fieldname/td...

So, please consider this request and let us know your valuable solutions/comments.

My requirement is to use the variable names as a field name.

For ex: lv_zbatch , lv_zmatnr, lv_zauto_date are the variables which I want to use these as field names (like zbatch, zmatnr, zauto_date) instead of hard coded value or using text element values.

Currently, I declared using text-001 as field name but due to code review process, I have to avoid this and go with other way solution. 

Please note, I don't have any structure and these are local variables. 

Thanks in advance.

Kind regards.

[Sandra_Rossi]

The following code is wrong because text-001 is for translatable texts but a field name should not be translated:

* anti-pattern
DATA(field_name_1) = text-001.
DATA(field_name_zmatnr) = 'ZMATNR'(001).

The following code is correct if the field name is used only once in the code (despite the "historic tendency in ABAP to wrap every literal in constants" (styleguides/clean-abap/CleanABAP.md at main · SAP/styleguides (github.com))):

DATA(field_name) = `ZMATNR`.

The following code is correct according to "There is a historic tendency in ABAP to wrap every literal in constants" (styleguides/clean-abap/CleanABAP.md at main · SAP/styleguides (github.com)) or if the field name is used more than once in the program:

CONSTANTS:
  BEGIN OF alv_field_names,
    zbatch TYPE string VALUE `ZBATCH`,
    zmatnr TYPE string VALUE `ZMATNR`,
  END OF alv_field_names.

•  "It is of course acceptable to repeat the constant's value if it is already descriptive enough" (styleguides/clean-abap/CleanABAP.md at main · SAP/styleguides (github.com))
• "If you cannot use enumerations and have to collect constants in a loose way, for example in an interface, at least group them" (styleguides/clean-abap/CleanABAP.md at main · SAP/styleguides (github.com))

There is a last solution where you get the name by combining RTTS and DESCRIBE DISTANCE, which you have to code yourself as I don't have the code available right now:

CONSTANTS alv_fields TYPE ... " any structure
DATA(alv_field_names) = zcl_abap_get_comp_names=>create( alv_fields ).
DATA(alv_field_name_zmatnr) = alv_field_names->get( alv_fields-zmatnr ).

[Sandra_Rossi]

As I said, "you have to code yourself as I don't have the code available right now".

[sankar1781]

Hi Sandra_Rossim

Thank you for your response.

Instead of declaring the constants or hard coded values like 'ZMATNR' , is there a way using offset or getting it from the variable lv_zmatnr. After lv_[name] , the name will be fetched as fieldname.

I also understand to achieve it by declaring a structure or the fields in the class method.  I have a similar one, defined it as a structure and derive it from the field cat. 

DATA(alv_field_names) = zcl_abap_get_comp_names=>create( alv_fields ).

[Sandra_Rossi]

Please do not post a solution. Instead, click on the "Reply" of the answer.

[matt]

As Sandra referenced the style guide, I'd also add that prefixes such as lv_ are discouraged. Just use meaningful names as in all strongly typed programming languages.