ABAP Select data from SAP table CFD_S_RUI_CDS_CONTEXT_MAIN into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP CFD_S_RUI_CDS_CONTEXT_MAIN 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_S_RUI_CDS_CONTEXT_MAIN. 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_S_RUI_CDS_CONTEXT_MAIN 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_S_RUI_CDS_CONTEXT_MAIN TYPE STANDARD TABLE OF CFD_S_RUI_CDS_CONTEXT_MAIN,
      WA_CFD_S_RUI_CDS_CONTEXT_MAIN TYPE CFD_S_RUI_CDS_CONTEXT_MAIN,
      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_S_RUI_CDS_CONTEXT_MAIN> TYPE CFD_S_RUI_CDS_CONTEXT_MAIN.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CFD_S_RUI_CDS_CONTEXT_MAIN
*  INTO TABLE @DATA(IT_CFD_S_RUI_CDS_CONTEXT_MAIN2).
*--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_S_RUI_CDS_CONTEXT_MAIN INDEX 1 INTO DATA(WA_CFD_S_RUI_CDS_CONTEXT_MAIN2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CFD_S_RUI_CDS_CONTEXT_MAIN>-CDS_VIEW_NAME = 1.
<CFD_S_RUI_CDS_CONTEXT_MAIN>-SUPPORTS_STANDARD_FIELDS = 1.
<CFD_S_RUI_CDS_CONTEXT_MAIN>-SUPPORTS_CUSTOM_FIELDS = 1.
<CFD_S_RUI_CDS_CONTEXT_MAIN>-DATA_VIA_ASSOC_TO_INCLUDE_VIEW = 1.
<CFD_S_RUI_CDS_CONTEXT_MAIN>-DATA_FROM_UNDERLYING_VIEW = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CFD_S_RUI_CDS_CONTEXT_MAIN-DATA_FROM_DRAFT_UNION, sy-vline,
  WA_CFD_S_RUI_CDS_CONTEXT_MAIN-DATA_FROM_UNION, sy-vline,
  WA_CFD_S_RUI_CDS_CONTEXT_MAIN-USE_CDS_VIEW_TEXT, sy-vline,
  WA_CFD_S_RUI_CDS_CONTEXT_MAIN-USE_OWN_TEXT, sy-vline,
  WA_CFD_S_RUI_CDS_CONTEXT_MAIN-DESCRIPTION, sy-vline,
  WA_CFD_S_RUI_CDS_CONTEXT_MAIN-AVAILABILITY, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CFD_S_RUI_CDS_CONTEXT_MAIN 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_S_RUI_CDS_CONTEXT_MAIN 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_S_RUI_CDS_CONTEXT_MAIN INTO WA_CFD_S_RUI_CDS_CONTEXT_MAIN.


*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_S_RUI_CDS_CONTEXT_MAIN_STR, 
CDS_VIEW_NAME TYPE STRING,
SUPPORTS_STANDARD_FIELDS TYPE STRING,
SUPPORTS_CUSTOM_FIELDS TYPE STRING,
DATA_VIA_ASSOC_TO_INCLUDE_VIEW TYPE STRING,
DATA_FROM_UNDERLYING_VIEW TYPE STRING,
DATA_FROM_DRAFT_UNION TYPE STRING,
DATA_FROM_UNION TYPE STRING,
USE_CDS_VIEW_TEXT TYPE STRING,
USE_OWN_TEXT TYPE STRING,
DESCRIPTION TYPE STRING,
AVAILABILITY TYPE STRING,
RELEASE_STATUS TYPE STRING,
TEXT_HANDLING_UNCLASSIFIED TYPE STRING,
TEXT_HANDLING_DENORMALIZED TYPE STRING,
TEXT_HANDLING_NOT_DENORMALIZED TYPE STRING,
BASIC_SEARCH_SUPPORT TYPE STRING,
HAS_GROUP_BY TYPE STRING,
HAS_DEFAULT_AGGREGATION TYPE STRING,
HAS_UNION TYPE STRING,
IS_ANALYTICAL_QUERY TYPE STRING,
HAS_DATACATEGORY_CUBE TYPE STRING,
IS_REDIRECT_VIEW TYPE STRING,
LANGUAGE_PARAMETER TYPE STRING,
BEHAVIOR_DEFINITION TYPE STRING,
BEHAVIOR_ENTITY_ALIAS TYPE STRING,
DET_VAL_SUPPORTED TYPE STRING,
HAS_DRAFT TYPE STRING,
USAGE_ENTERPRISE_SEARCH TYPE STRING,
USAGE_UI_REPORT TYPE STRING,
USAGE_EMAIL_TEMPLATE TYPE STRING,
USAGE_API TYPE STRING,
USAGE_INVISIBLE TYPE STRING,
BADI_DEFINITION_FOR_HIDDEN TYPE STRING,
ENTITY_IMPORT_PARAMETER_STRUC TYPE STRING,
BADI_ADDITIONAL_DATA_CLASS TYPE STRING,
RELEASE_STATUS_DE TYPE STRING,
USE_ASSOCIATION TYPE STRING,
USE_UNDERLYING_ASSOCIATIONS TYPE STRING,
USE_UNDERLYING_FIELDS TYPE STRING,
UNDERLYING_VIEW_ALIAS TYPE STRING,
UNDERLYING_VIEW_NAME TYPE STRING,
USAGE_INVISIBLE_DE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CFD_S_RUI_CDS_CONTEXT_MAIN_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_S_RUI_CDS_CONTEXT_MAIN_STR-CDS_VIEW_NAME sy-vline 
WA_CFD_S_RUI_CDS_CONTEXT_MAIN_STR-SUPPORTS_STANDARD_FIELDS sy-vline 
WA_CFD_S_RUI_CDS_CONTEXT_MAIN_STR-SUPPORTS_CUSTOM_FIELDS sy-vline 
WA_CFD_S_RUI_CDS_CONTEXT_MAIN_STR-DATA_VIA_ASSOC_TO_INCLUDE_VIEW sy-vline 
WA_CFD_S_RUI_CDS_CONTEXT_MAIN_STR-DATA_FROM_UNDERLYING_VIEW sy-vline 
WA_CFD_S_RUI_CDS_CONTEXT_MAIN_STR-DATA_FROM_DRAFT_UNION sy-vline 
WA_CFD_S_RUI_CDS_CONTEXT_MAIN_STR-DATA_FROM_UNION sy-vline 
WA_CFD_S_RUI_CDS_CONTEXT_MAIN_STR-USE_CDS_VIEW_TEXT sy-vline 
WA_CFD_S_RUI_CDS_CONTEXT_MAIN_STR-USE_OWN_TEXT sy-vline 
WA_CFD_S_RUI_CDS_CONTEXT_MAIN_STR-DESCRIPTION sy-vline 
WA_CFD_S_RUI_CDS_CONTEXT_MAIN_STR-AVAILABILITY sy-vline 
WA_CFD_S_RUI_CDS_CONTEXT_MAIN_STR-RELEASE_STATUS sy-vline 
WA_CFD_S_RUI_CDS_CONTEXT_MAIN_STR-TEXT_HANDLING_UNCLASSIFIED sy-vline 
WA_CFD_S_RUI_CDS_CONTEXT_MAIN_STR-TEXT_HANDLING_DENORMALIZED sy-vline 
WA_CFD_S_RUI_CDS_CONTEXT_MAIN_STR-TEXT_HANDLING_NOT_DENORMALIZED sy-vline 
WA_CFD_S_RUI_CDS_CONTEXT_MAIN_STR-BASIC_SEARCH_SUPPORT sy-vline 
WA_CFD_S_RUI_CDS_CONTEXT_MAIN_STR-HAS_GROUP_BY sy-vline 
WA_CFD_S_RUI_CDS_CONTEXT_MAIN_STR-HAS_DEFAULT_AGGREGATION sy-vline 
WA_CFD_S_RUI_CDS_CONTEXT_MAIN_STR-HAS_UNION sy-vline 
WA_CFD_S_RUI_CDS_CONTEXT_MAIN_STR-IS_ANALYTICAL_QUERY sy-vline 
WA_CFD_S_RUI_CDS_CONTEXT_MAIN_STR-HAS_DATACATEGORY_CUBE sy-vline 
WA_CFD_S_RUI_CDS_CONTEXT_MAIN_STR-IS_REDIRECT_VIEW sy-vline 
WA_CFD_S_RUI_CDS_CONTEXT_MAIN_STR-LANGUAGE_PARAMETER sy-vline 
WA_CFD_S_RUI_CDS_CONTEXT_MAIN_STR-BEHAVIOR_DEFINITION sy-vline 
WA_CFD_S_RUI_CDS_CONTEXT_MAIN_STR-BEHAVIOR_ENTITY_ALIAS sy-vline 
WA_CFD_S_RUI_CDS_CONTEXT_MAIN_STR-DET_VAL_SUPPORTED sy-vline 
WA_CFD_S_RUI_CDS_CONTEXT_MAIN_STR-HAS_DRAFT sy-vline 
WA_CFD_S_RUI_CDS_CONTEXT_MAIN_STR-USAGE_ENTERPRISE_SEARCH sy-vline 
WA_CFD_S_RUI_CDS_CONTEXT_MAIN_STR-USAGE_UI_REPORT sy-vline 
WA_CFD_S_RUI_CDS_CONTEXT_MAIN_STR-USAGE_EMAIL_TEMPLATE sy-vline 
WA_CFD_S_RUI_CDS_CONTEXT_MAIN_STR-USAGE_API sy-vline 
WA_CFD_S_RUI_CDS_CONTEXT_MAIN_STR-USAGE_INVISIBLE sy-vline 
WA_CFD_S_RUI_CDS_CONTEXT_MAIN_STR-BADI_DEFINITION_FOR_HIDDEN sy-vline 
WA_CFD_S_RUI_CDS_CONTEXT_MAIN_STR-ENTITY_IMPORT_PARAMETER_STRUC sy-vline 
WA_CFD_S_RUI_CDS_CONTEXT_MAIN_STR-BADI_ADDITIONAL_DATA_CLASS sy-vline 
WA_CFD_S_RUI_CDS_CONTEXT_MAIN_STR-RELEASE_STATUS_DE sy-vline 
WA_CFD_S_RUI_CDS_CONTEXT_MAIN_STR-USE_ASSOCIATION sy-vline 
WA_CFD_S_RUI_CDS_CONTEXT_MAIN_STR-USE_UNDERLYING_ASSOCIATIONS sy-vline 
WA_CFD_S_RUI_CDS_CONTEXT_MAIN_STR-USE_UNDERLYING_FIELDS sy-vline 
WA_CFD_S_RUI_CDS_CONTEXT_MAIN_STR-UNDERLYING_VIEW_ALIAS sy-vline 
WA_CFD_S_RUI_CDS_CONTEXT_MAIN_STR-UNDERLYING_VIEW_NAME sy-vline 
WA_CFD_S_RUI_CDS_CONTEXT_MAIN_STR-USAGE_INVISIBLE_DE sy-vline      INTO ld_text SEPARATED BY SPACE.

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