ABAP Select data from SAP table RN1_SCREEN_FIELDS into internal table

Get Example source ABAP code based on a different SAP table
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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RN1_SCREEN_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 RN1_SCREEN_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 RN1_SCREEN_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_RN1_SCREEN_FIELDS TYPE STANDARD TABLE OF RN1_SCREEN_FIELDS,
      WA_RN1_SCREEN_FIELDS TYPE RN1_SCREEN_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: <RN1_SCREEN_FIELDS> TYPE RN1_SCREEN_FIELDS.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RN1_SCREEN_FIELDS.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RN1_SCREEN_FIELDS
  INTO TABLE IT_RN1_SCREEN_FIELDS.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RN1_SCREEN_FIELDS
*  INTO TABLE @DATA(IT_RN1_SCREEN_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_RN1_SCREEN_FIELDS INDEX 1 INTO DATA(WA_RN1_SCREEN_FIELDS2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RN1_SCREEN_FIELDS ASSIGNING <RN1_SCREEN_FIELDS>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RN1_SCREEN_FIELDS>-LABEL_NAME = 1.
<RN1_SCREEN_FIELDS>-LABEL_TEXT = 1.
<RN1_SCREEN_FIELDS>-LABEL_ATTR = 1.
<RN1_SCREEN_FIELDS>-TYPE = 1.
<RN1_SCREEN_FIELDS>-NAME = 1.

ENDLOOP.

LOOP AT IT_RN1_SCREEN_FIELDS INTO WA_RN1_SCREEN_FIELDS.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RN1_SCREEN_FIELDS-TEXT, sy-vline,
  WA_RN1_SCREEN_FIELDS-DROPDOWN, sy-vline,
  WA_RN1_SCREEN_FIELDS-ICON_NAME, sy-vline,
  WA_RN1_SCREEN_FIELDS-ICON_QINFO, sy-vline,
  WA_RN1_SCREEN_FIELDS-ICON_QSPEC, sy-vline,
  WA_RN1_SCREEN_FIELDS-WITH_ICON, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RN1_SCREEN_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_RN1_SCREEN_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_RN1_SCREEN_FIELDS INTO WA_RN1_SCREEN_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_RN1_SCREEN_FIELDS_STR, 
LABEL_NAME TYPE STRING,
LABEL_TEXT TYPE STRING,
LABEL_ATTR TYPE STRING,
TYPE TYPE STRING,
NAME TYPE STRING,
TEXT TYPE STRING,
DROPDOWN TYPE STRING,
ICON_NAME TYPE STRING,
ICON_QINFO TYPE STRING,
ICON_QSPEC TYPE STRING,
WITH_ICON TYPE STRING,
ROLLING TYPE STRING,
LINE TYPE STRING,
COLUMN TYPE STRING,
LENGTH TYPE STRING,
VISLENGTH TYPE STRING,
HEIGHT TYPE STRING,
GROUP1 TYPE STRING,
GROUP2 TYPE STRING,
GROUP3 TYPE STRING,
GROUP4 TYPE STRING,
PUSH_FCODE TYPE STRING,
PUSH_FTYPE TYPE STRING,
CXT_MENON TYPE STRING,
FORMAT TYPE STRING,
FROM_DICT TYPE STRING,
MODIFIC TYPE STRING,
CONV_EXIT TYPE STRING,
PARAM_ID TYPE STRING,
SET_PARAM TYPE STRING,
GET_PARAM TYPE STRING,
UP_LOWER TYPE STRING,
NO_TEMPL TYPE STRING,
FOREIGNKEY TYPE STRING,
INPUT_FLD TYPE STRING,
OUTPUT_FLD TYPE STRING,
OUTPUTONLY TYPE STRING,
REQU_ENTRY TYPE STRING,
POSS_ENTRY TYPE STRING,
DROPFROM TYPE STRING,
RIGHT_JUST TYPE STRING,
LEAD_ZEROS TYPE STRING,
*_ENTRY TYPE STRING,
NO_RESET TYPE STRING,
FIXED_FONT TYPE STRING,
BRIGHT TYPE STRING,
INVISIBLE TYPE STRING,
2_DIMENS TYPE STRING,
LABELLEFT TYPE STRING,
LABELRIGHT TYPE STRING,
LTR TYPE STRING,
BIDICTRL TYPE STRING,
DBLCLICK TYPE STRING,
MATCHCODE TYPE STRING,
REF_FIELD TYPE STRING,
TC_TITLE TYPE STRING,
TC_HEADING TYPE STRING,
TC_SELCOL TYPE STRING,
BUTT_RIGHT TYPE STRING,
DICT_I_FKY TYPE STRING,
DICT_I_FKD TYPE STRING,
DICT_I_SGN TYPE STRING,
DICT_I_VAL TYPE STRING,
SFW_SWITCHID TYPE STRING,
SFW_SHOWHIDE TYPE STRING,
PROPERTIES TYPE STRING,
VALUE_NAME TYPE STRING,
VALUE_TEXT TYPE STRING,
VALUE_ATTR TYPE STRING,
TYPE TYPE STRING,
NAME TYPE STRING,
TEXT TYPE STRING,
DROPDOWN TYPE STRING,
ICON_NAME TYPE STRING,
ICON_QINFO TYPE STRING,
ICON_QSPEC TYPE STRING,
WITH_ICON TYPE STRING,
ROLLING TYPE STRING,
LINE TYPE STRING,
COLUMN TYPE STRING,
LENGTH TYPE STRING,
VISLENGTH TYPE STRING,
HEIGHT TYPE STRING,
GROUP1 TYPE STRING,
GROUP2 TYPE STRING,
GROUP3 TYPE STRING,
GROUP4 TYPE STRING,
PUSH_FCODE TYPE STRING,
PUSH_FTYPE TYPE STRING,
CXT_MENON TYPE STRING,
FORMAT TYPE STRING,
FROM_DICT TYPE STRING,
MODIFIC TYPE STRING,
CONV_EXIT TYPE STRING,
PARAM_ID TYPE STRING,
SET_PARAM TYPE STRING,
GET_PARAM TYPE STRING,
UP_LOWER TYPE STRING,
NO_TEMPL TYPE STRING,
FOREIGNKEY TYPE STRING,
INPUT_FLD TYPE STRING,
OUTPUT_FLD TYPE STRING,
OUTPUTONLY TYPE STRING,
REQU_ENTRY TYPE STRING,
POSS_ENTRY TYPE STRING,
DROPFROM TYPE STRING,
RIGHT_JUST TYPE STRING,
LEAD_ZEROS TYPE STRING,
*_ENTRY TYPE STRING,
NO_RESET TYPE STRING,
FIXED_FONT TYPE STRING,
BRIGHT TYPE STRING,
INVISIBLE TYPE STRING,
2_DIMENS TYPE STRING,
LABELLEFT TYPE STRING,
LABELRIGHT TYPE STRING,
LTR TYPE STRING,
BIDICTRL TYPE STRING,
DBLCLICK TYPE STRING,
MATCHCODE TYPE STRING,
REF_FIELD TYPE STRING,
TC_TITLE TYPE STRING,
TC_HEADING TYPE STRING,
TC_SELCOL TYPE STRING,
BUTT_RIGHT TYPE STRING,
DICT_I_FKY TYPE STRING,
DICT_I_FKD TYPE STRING,
DICT_I_SGN TYPE STRING,
DICT_I_VAL TYPE STRING,
SFW_SWITCHID TYPE STRING,
SFW_SHOWHIDE TYPE STRING,
PROPERTIES TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RN1_SCREEN_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_RN1_SCREEN_FIELDS_STR-LABEL_NAME sy-vline 
WA_RN1_SCREEN_FIELDS_STR-LABEL_TEXT sy-vline 
WA_RN1_SCREEN_FIELDS_STR-LABEL_ATTR sy-vline 
WA_RN1_SCREEN_FIELDS_STR-TYPE sy-vline 
WA_RN1_SCREEN_FIELDS_STR-NAME sy-vline 
WA_RN1_SCREEN_FIELDS_STR-TEXT sy-vline 
WA_RN1_SCREEN_FIELDS_STR-DROPDOWN sy-vline 
WA_RN1_SCREEN_FIELDS_STR-ICON_NAME sy-vline 
WA_RN1_SCREEN_FIELDS_STR-ICON_QINFO sy-vline 
WA_RN1_SCREEN_FIELDS_STR-ICON_QSPEC sy-vline 
WA_RN1_SCREEN_FIELDS_STR-WITH_ICON sy-vline 
WA_RN1_SCREEN_FIELDS_STR-ROLLING sy-vline 
WA_RN1_SCREEN_FIELDS_STR-LINE sy-vline 
WA_RN1_SCREEN_FIELDS_STR-COLUMN sy-vline 
WA_RN1_SCREEN_FIELDS_STR-LENGTH sy-vline 
WA_RN1_SCREEN_FIELDS_STR-VISLENGTH sy-vline 
WA_RN1_SCREEN_FIELDS_STR-HEIGHT sy-vline 
WA_RN1_SCREEN_FIELDS_STR-GROUP1 sy-vline 
WA_RN1_SCREEN_FIELDS_STR-GROUP2 sy-vline 
WA_RN1_SCREEN_FIELDS_STR-GROUP3 sy-vline 
WA_RN1_SCREEN_FIELDS_STR-GROUP4 sy-vline 
WA_RN1_SCREEN_FIELDS_STR-PUSH_FCODE sy-vline 
WA_RN1_SCREEN_FIELDS_STR-PUSH_FTYPE sy-vline 
WA_RN1_SCREEN_FIELDS_STR-CXT_MENON sy-vline 
WA_RN1_SCREEN_FIELDS_STR-FORMAT sy-vline 
WA_RN1_SCREEN_FIELDS_STR-FROM_DICT sy-vline 
WA_RN1_SCREEN_FIELDS_STR-MODIFIC sy-vline 
WA_RN1_SCREEN_FIELDS_STR-CONV_EXIT sy-vline 
WA_RN1_SCREEN_FIELDS_STR-PARAM_ID sy-vline 
WA_RN1_SCREEN_FIELDS_STR-SET_PARAM sy-vline 
WA_RN1_SCREEN_FIELDS_STR-GET_PARAM sy-vline 
WA_RN1_SCREEN_FIELDS_STR-UP_LOWER sy-vline 
WA_RN1_SCREEN_FIELDS_STR-NO_TEMPL sy-vline 
WA_RN1_SCREEN_FIELDS_STR-FOREIGNKEY sy-vline 
WA_RN1_SCREEN_FIELDS_STR-INPUT_FLD sy-vline 
WA_RN1_SCREEN_FIELDS_STR-OUTPUT_FLD sy-vline 
WA_RN1_SCREEN_FIELDS_STR-OUTPUTONLY sy-vline 
WA_RN1_SCREEN_FIELDS_STR-REQU_ENTRY sy-vline 
WA_RN1_SCREEN_FIELDS_STR-POSS_ENTRY sy-vline 
WA_RN1_SCREEN_FIELDS_STR-DROPFROM sy-vline 
WA_RN1_SCREEN_FIELDS_STR-RIGHT_JUST sy-vline 
WA_RN1_SCREEN_FIELDS_STR-LEAD_ZEROS sy-vline 
WA_RN1_SCREEN_FIELDS_STR-*_ENTRY sy-vline 
WA_RN1_SCREEN_FIELDS_STR-NO_RESET sy-vline 
WA_RN1_SCREEN_FIELDS_STR-FIXED_FONT sy-vline 
WA_RN1_SCREEN_FIELDS_STR-BRIGHT sy-vline 
WA_RN1_SCREEN_FIELDS_STR-INVISIBLE sy-vline 
WA_RN1_SCREEN_FIELDS_STR-2_DIMENS sy-vline 
WA_RN1_SCREEN_FIELDS_STR-LABELLEFT sy-vline 
WA_RN1_SCREEN_FIELDS_STR-LABELRIGHT sy-vline 
WA_RN1_SCREEN_FIELDS_STR-LTR sy-vline 
WA_RN1_SCREEN_FIELDS_STR-BIDICTRL sy-vline 
WA_RN1_SCREEN_FIELDS_STR-DBLCLICK sy-vline 
WA_RN1_SCREEN_FIELDS_STR-MATCHCODE sy-vline 
WA_RN1_SCREEN_FIELDS_STR-REF_FIELD sy-vline 
WA_RN1_SCREEN_FIELDS_STR-TC_TITLE sy-vline 
WA_RN1_SCREEN_FIELDS_STR-TC_HEADING sy-vline 
WA_RN1_SCREEN_FIELDS_STR-TC_SELCOL sy-vline 
WA_RN1_SCREEN_FIELDS_STR-BUTT_RIGHT sy-vline 
WA_RN1_SCREEN_FIELDS_STR-DICT_I_FKY sy-vline 
WA_RN1_SCREEN_FIELDS_STR-DICT_I_FKD sy-vline 
WA_RN1_SCREEN_FIELDS_STR-DICT_I_SGN sy-vline 
WA_RN1_SCREEN_FIELDS_STR-DICT_I_VAL sy-vline 
WA_RN1_SCREEN_FIELDS_STR-SFW_SWITCHID sy-vline 
WA_RN1_SCREEN_FIELDS_STR-SFW_SHOWHIDE sy-vline 
WA_RN1_SCREEN_FIELDS_STR-PROPERTIES sy-vline 
WA_RN1_SCREEN_FIELDS_STR-VALUE_NAME sy-vline 
WA_RN1_SCREEN_FIELDS_STR-VALUE_TEXT sy-vline 
WA_RN1_SCREEN_FIELDS_STR-VALUE_ATTR sy-vline 
WA_RN1_SCREEN_FIELDS_STR-TYPE sy-vline 
WA_RN1_SCREEN_FIELDS_STR-NAME sy-vline 
WA_RN1_SCREEN_FIELDS_STR-TEXT sy-vline 
WA_RN1_SCREEN_FIELDS_STR-DROPDOWN sy-vline 
WA_RN1_SCREEN_FIELDS_STR-ICON_NAME sy-vline 
WA_RN1_SCREEN_FIELDS_STR-ICON_QINFO sy-vline 
WA_RN1_SCREEN_FIELDS_STR-ICON_QSPEC sy-vline 
WA_RN1_SCREEN_FIELDS_STR-WITH_ICON sy-vline 
WA_RN1_SCREEN_FIELDS_STR-ROLLING sy-vline 
WA_RN1_SCREEN_FIELDS_STR-LINE sy-vline 
WA_RN1_SCREEN_FIELDS_STR-COLUMN sy-vline 
WA_RN1_SCREEN_FIELDS_STR-LENGTH sy-vline 
WA_RN1_SCREEN_FIELDS_STR-VISLENGTH sy-vline 
WA_RN1_SCREEN_FIELDS_STR-HEIGHT sy-vline 
WA_RN1_SCREEN_FIELDS_STR-GROUP1 sy-vline 
WA_RN1_SCREEN_FIELDS_STR-GROUP2 sy-vline 
WA_RN1_SCREEN_FIELDS_STR-GROUP3 sy-vline 
WA_RN1_SCREEN_FIELDS_STR-GROUP4 sy-vline 
WA_RN1_SCREEN_FIELDS_STR-PUSH_FCODE sy-vline 
WA_RN1_SCREEN_FIELDS_STR-PUSH_FTYPE sy-vline 
WA_RN1_SCREEN_FIELDS_STR-CXT_MENON sy-vline 
WA_RN1_SCREEN_FIELDS_STR-FORMAT sy-vline 
WA_RN1_SCREEN_FIELDS_STR-FROM_DICT sy-vline 
WA_RN1_SCREEN_FIELDS_STR-MODIFIC sy-vline 
WA_RN1_SCREEN_FIELDS_STR-CONV_EXIT sy-vline 
WA_RN1_SCREEN_FIELDS_STR-PARAM_ID sy-vline 
WA_RN1_SCREEN_FIELDS_STR-SET_PARAM sy-vline 
WA_RN1_SCREEN_FIELDS_STR-GET_PARAM sy-vline 
WA_RN1_SCREEN_FIELDS_STR-UP_LOWER sy-vline 
WA_RN1_SCREEN_FIELDS_STR-NO_TEMPL sy-vline 
WA_RN1_SCREEN_FIELDS_STR-FOREIGNKEY sy-vline 
WA_RN1_SCREEN_FIELDS_STR-INPUT_FLD sy-vline 
WA_RN1_SCREEN_FIELDS_STR-OUTPUT_FLD sy-vline 
WA_RN1_SCREEN_FIELDS_STR-OUTPUTONLY sy-vline 
WA_RN1_SCREEN_FIELDS_STR-REQU_ENTRY sy-vline 
WA_RN1_SCREEN_FIELDS_STR-POSS_ENTRY sy-vline 
WA_RN1_SCREEN_FIELDS_STR-DROPFROM sy-vline 
WA_RN1_SCREEN_FIELDS_STR-RIGHT_JUST sy-vline 
WA_RN1_SCREEN_FIELDS_STR-LEAD_ZEROS sy-vline 
WA_RN1_SCREEN_FIELDS_STR-*_ENTRY sy-vline 
WA_RN1_SCREEN_FIELDS_STR-NO_RESET sy-vline 
WA_RN1_SCREEN_FIELDS_STR-FIXED_FONT sy-vline 
WA_RN1_SCREEN_FIELDS_STR-BRIGHT sy-vline 
WA_RN1_SCREEN_FIELDS_STR-INVISIBLE sy-vline 
WA_RN1_SCREEN_FIELDS_STR-2_DIMENS sy-vline 
WA_RN1_SCREEN_FIELDS_STR-LABELLEFT sy-vline 
WA_RN1_SCREEN_FIELDS_STR-LABELRIGHT sy-vline 
WA_RN1_SCREEN_FIELDS_STR-LTR sy-vline 
WA_RN1_SCREEN_FIELDS_STR-BIDICTRL sy-vline 
WA_RN1_SCREEN_FIELDS_STR-DBLCLICK sy-vline 
WA_RN1_SCREEN_FIELDS_STR-MATCHCODE sy-vline 
WA_RN1_SCREEN_FIELDS_STR-REF_FIELD sy-vline 
WA_RN1_SCREEN_FIELDS_STR-TC_TITLE sy-vline 
WA_RN1_SCREEN_FIELDS_STR-TC_HEADING sy-vline 
WA_RN1_SCREEN_FIELDS_STR-TC_SELCOL sy-vline 
WA_RN1_SCREEN_FIELDS_STR-BUTT_RIGHT sy-vline 
WA_RN1_SCREEN_FIELDS_STR-DICT_I_FKY sy-vline 
WA_RN1_SCREEN_FIELDS_STR-DICT_I_FKD sy-vline 
WA_RN1_SCREEN_FIELDS_STR-DICT_I_SGN sy-vline 
WA_RN1_SCREEN_FIELDS_STR-DICT_I_VAL sy-vline 
WA_RN1_SCREEN_FIELDS_STR-SFW_SWITCHID sy-vline 
WA_RN1_SCREEN_FIELDS_STR-SFW_SHOWHIDE sy-vline 
WA_RN1_SCREEN_FIELDS_STR-PROPERTIES sy-vline      INTO ld_text SEPARATED BY SPACE.

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