ABAP Select data from SAP table CFD_L_RT_FIELDS into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP CFD_L_RT_FIELDS table and store it within an internal table, including using the newer @DATA inline declaration methods. It also shows you various ways to process this data using ABAP work area, inline declaration or field symbols including executing all the relevant CONVERSION_EXIT routines specific to CFD_L_RT_FIELDS. See here for more generic Select statement tips.

Sometimes data within SAP is stored within the database table in a different format to what it is displayed to the user. These input/output conversation FM routines are what translates the data between the two formats.

There is also a full declaration of the CFD_L_RT_FIELDS table where each field has a char/string type for you to simply copy and paste. This allows you to use processing that is only available to these field types such as the CONCATENATE statement.

DATA: IT_CFD_L_RT_FIELDS TYPE STANDARD TABLE OF CFD_L_RT_FIELDS,
      WA_CFD_L_RT_FIELDS TYPE CFD_L_RT_FIELDS,
      GD_STR TYPE STRING.

DATA: lo_typedescr type REF TO cl_abap_typedescr.
DATA: lv_fieldname type fieldname.

FIELD-SYMBOLS: <FIELD> TYPE any.
FIELD-SYMBOLS: <CFD_L_RT_FIELDS> TYPE CFD_L_RT_FIELDS.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_CFD_L_RT_FIELDS.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM CFD_L_RT_FIELDS
  INTO TABLE IT_CFD_L_RT_FIELDS.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CFD_L_RT_FIELDS
*  INTO TABLE @DATA(IT_CFD_L_RT_FIELDS2).
*--Further methods of using ABAP code to  select data from SAP database tables

*You can also declare the header/work area using the in-line DATA declaration method
READ TABLE IT_CFD_L_RT_FIELDS INDEX 1 INTO DATA(WA_CFD_L_RT_FIELDS2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_CFD_L_RT_FIELDS ASSIGNING <CFD_L_RT_FIELDS>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CFD_L_RT_FIELDS>-MODEL_KEY = 1.
<CFD_L_RT_FIELDS>-ENTITY_NAME = 1.
<CFD_L_RT_FIELDS>-BUSINESS_CONTEXT = 1.
<CFD_L_RT_FIELDS>-ROLE_SUFFIX = 1.
<CFD_L_RT_FIELDS>-UNION_SUFFIX = 1.

ENDLOOP.

LOOP AT IT_CFD_L_RT_FIELDS INTO WA_CFD_L_RT_FIELDS.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CFD_L_RT_FIELDS-ODATA_ABAP_FIELD_NAME, sy-vline,
  WA_CFD_L_RT_FIELDS-CUSTOM_FIELD_NAME, sy-vline,
  WA_CFD_L_RT_FIELDS-ODATA_EXTERNAL_FIELD_NAME, sy-vline,
  WA_CFD_L_RT_FIELDS-PERSISTENCE_ABAP_FIELD_NAME, sy-vline,
  WA_CFD_L_RT_FIELDS-ENHANCEMENT_PREFIX, sy-vline,
  WA_CFD_L_RT_FIELDS-SADL_MAPPING_PATH, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CFD_L_RT_FIELDS you want to display...

  WRITE:/ sy-uline.
* Aternatively use generic code to Write field values (and NAME) to screen report
  DO.
    ASSIGN COMPONENT sy-index OF STRUCTURE wa_CFD_L_RT_FIELDS TO <field>.
    IF sy-subrc <> 0. EXIT. ENDIF.
    WRITE:/ 'Field Value', <field>, sy-vline.
    gd_str = <field> .
    lo_typedescr ?= CL_ABAP_DATADESCR=>DESCRIBE_BY_DATA( <field> ).
    lv_fieldname = lo_typedescr->GET_RELATIVE_NAME( ).
    WRITE:/ 'Field Name', lv_fieldname.
  ENDDO.

  
*Redo loop but convert all fields from internal to out value  
LOOP AT IT_CFD_L_RT_FIELDS INTO WA_CFD_L_RT_FIELDS.


*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Convert all fields to display/output versions using conversion routines
  PERFORM convert_all_field_values CHANGING wa_EKKO.
	 
ENDLOOP.

  
*&---------------------------------------------------------------------*
*& Form convert_all_field_values
*&---------------------------------------------------------------------*
FORM convert_all_field_values CHANGING p_EKKO LIKE wa_EKKO.
DATA: ld_input(1000) TYPE c, ld_output(1000) TYPE C.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_CFD_L_RT_FIELDS_STR, 
MODEL_KEY TYPE STRING,
ENTITY_NAME TYPE STRING,
BUSINESS_CONTEXT TYPE STRING,
ROLE_SUFFIX TYPE STRING,
UNION_SUFFIX TYPE STRING,
ODATA_ABAP_FIELD_NAME TYPE STRING,
CUSTOM_FIELD_NAME TYPE STRING,
ODATA_EXTERNAL_FIELD_NAME TYPE STRING,
PERSISTENCE_ABAP_FIELD_NAME TYPE STRING,
ENHANCEMENT_PREFIX TYPE STRING,
SADL_MAPPING_PATH TYPE STRING,
FIELD_TYPE TYPE STRING,
LENGTH TYPE STRING,
DATA_ELEMENT_NAME TYPE STRING,
INCLUDE_IN_BASIC_SEARCH TYPE STRING,
VALUE_HELP_CODE_CDS_VIEW_NAME TYPE STRING,
VALUE_HELP_ENTITY_NAME TYPE STRING,
VALUE_HELP_ENTITY_SET_NAME TYPE STRING,
VALUE_HELP_GROUP TYPE STRING,
REF_CODE_FIELD_NAME TYPE STRING,
REF_DESCRIPTION_FIELD_NAME TYPE STRING,
REF_FIELD_CONTROL_FIELD_NAME TYPE STRING,
IS_CODE_FIELD TYPE STRING,
IS_DESCRIPTION_FIELD TYPE STRING,
IS_FIELD_CONTROL_FIELD TYPE STRING,
ASSOCIATED_BO TYPE STRING,
ASSOCIATED_BO_FIELD_NAME TYPE STRING,
ASSOCIATED_BO_COMP_IDENTIFIER TYPE STRING,
ASSOCIATED_BO_SEMANTIC_OBJECT TYPE STRING,
ASSOCIATED_BO_SEMANTIC_ACTION TYPE STRING,
DISPLAY_OPTION TYPE STRING,
CDS_ASSOCIATION_NAME TYPE STRING,
TEXT_ENTITY_SET_NAME TYPE STRING,
DISPLAY_FORMAT TYPE STRING,
CDS_TEXT_DENORMALIZATION TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CFD_L_RT_FIELDS_STR type T_EKKO_STR.

DATA: ld_text TYPE string.

LOOP AT IT_EKKO INTO WA_EKKO.
  MOVE-CORRESPONDING wa_EKKO TO WA_EKKO_STR.
  CONCATENATE: sy-vline
WA_CFD_L_RT_FIELDS_STR-MODEL_KEY sy-vline 
WA_CFD_L_RT_FIELDS_STR-ENTITY_NAME sy-vline 
WA_CFD_L_RT_FIELDS_STR-BUSINESS_CONTEXT sy-vline 
WA_CFD_L_RT_FIELDS_STR-ROLE_SUFFIX sy-vline 
WA_CFD_L_RT_FIELDS_STR-UNION_SUFFIX sy-vline 
WA_CFD_L_RT_FIELDS_STR-ODATA_ABAP_FIELD_NAME sy-vline 
WA_CFD_L_RT_FIELDS_STR-CUSTOM_FIELD_NAME sy-vline 
WA_CFD_L_RT_FIELDS_STR-ODATA_EXTERNAL_FIELD_NAME sy-vline 
WA_CFD_L_RT_FIELDS_STR-PERSISTENCE_ABAP_FIELD_NAME sy-vline 
WA_CFD_L_RT_FIELDS_STR-ENHANCEMENT_PREFIX sy-vline 
WA_CFD_L_RT_FIELDS_STR-SADL_MAPPING_PATH sy-vline 
WA_CFD_L_RT_FIELDS_STR-FIELD_TYPE sy-vline 
WA_CFD_L_RT_FIELDS_STR-LENGTH sy-vline 
WA_CFD_L_RT_FIELDS_STR-DATA_ELEMENT_NAME sy-vline 
WA_CFD_L_RT_FIELDS_STR-INCLUDE_IN_BASIC_SEARCH sy-vline 
WA_CFD_L_RT_FIELDS_STR-VALUE_HELP_CODE_CDS_VIEW_NAME sy-vline 
WA_CFD_L_RT_FIELDS_STR-VALUE_HELP_ENTITY_NAME sy-vline 
WA_CFD_L_RT_FIELDS_STR-VALUE_HELP_ENTITY_SET_NAME sy-vline 
WA_CFD_L_RT_FIELDS_STR-VALUE_HELP_GROUP sy-vline 
WA_CFD_L_RT_FIELDS_STR-REF_CODE_FIELD_NAME sy-vline 
WA_CFD_L_RT_FIELDS_STR-REF_DESCRIPTION_FIELD_NAME sy-vline 
WA_CFD_L_RT_FIELDS_STR-REF_FIELD_CONTROL_FIELD_NAME sy-vline 
WA_CFD_L_RT_FIELDS_STR-IS_CODE_FIELD sy-vline 
WA_CFD_L_RT_FIELDS_STR-IS_DESCRIPTION_FIELD sy-vline 
WA_CFD_L_RT_FIELDS_STR-IS_FIELD_CONTROL_FIELD sy-vline 
WA_CFD_L_RT_FIELDS_STR-ASSOCIATED_BO sy-vline 
WA_CFD_L_RT_FIELDS_STR-ASSOCIATED_BO_FIELD_NAME sy-vline 
WA_CFD_L_RT_FIELDS_STR-ASSOCIATED_BO_COMP_IDENTIFIER sy-vline 
WA_CFD_L_RT_FIELDS_STR-ASSOCIATED_BO_SEMANTIC_OBJECT sy-vline 
WA_CFD_L_RT_FIELDS_STR-ASSOCIATED_BO_SEMANTIC_ACTION sy-vline 
WA_CFD_L_RT_FIELDS_STR-DISPLAY_OPTION sy-vline 
WA_CFD_L_RT_FIELDS_STR-CDS_ASSOCIATION_NAME sy-vline 
WA_CFD_L_RT_FIELDS_STR-TEXT_ENTITY_SET_NAME sy-vline 
WA_CFD_L_RT_FIELDS_STR-DISPLAY_FORMAT sy-vline 
WA_CFD_L_RT_FIELDS_STR-CDS_TEXT_DENORMALIZATION sy-vline      INTO ld_text SEPARATED BY SPACE.

*Add any further fields from structure WA_EKKO_STR you want to CONCATENATE...
ENDLOOP.
ENDFORM.