ABAP Select data from SAP table RNDIA_TXT into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RNDIA_TXT 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 RNDIA_TXT. 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 RNDIA_TXT 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_RNDIA_TXT TYPE STANDARD TABLE OF RNDIA_TXT,
      WA_RNDIA_TXT TYPE RNDIA_TXT,
      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: <RNDIA_TXT> TYPE RNDIA_TXT.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RNDIA_TXT
*  INTO TABLE @DATA(IT_RNDIA_TXT2).
*--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_RNDIA_TXT INDEX 1 INTO DATA(WA_RNDIA_TXT2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RNDIA_TXT>-DKAT = 1.
<RNDIA_TXT>-DKEY = 1.
<RNDIA_TXT>-LFDNR = 1.
<RNDIA_TXT>-DIATXT1 = 1.
<RNDIA_TXT>-DIATXT2 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RNDIA_TXT-DIATXT3, sy-vline,
  WA_RNDIA_TXT-DITXT, sy-vline,
  WA_RNDIA_TXT-EWDIA, sy-vline,
  WA_RNDIA_TXT-BHDIA, sy-vline,
  WA_RNDIA_TXT-AFDIA, sy-vline,
  WA_RNDIA_TXT-ENDIA, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RNDIA_TXT 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_RNDIA_TXT 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_RNDIA_TXT INTO WA_RNDIA_TXT.


*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_RNDIA_TXT_STR, 
DKAT TYPE STRING,
DKEY TYPE STRING,
LFDNR TYPE STRING,
DIATXT1 TYPE STRING,
DIATXT2 TYPE STRING,
DIATXT3 TYPE STRING,
DITXT TYPE STRING,
EWDIA TYPE STRING,
BHDIA TYPE STRING,
AFDIA TYPE STRING,
ENDIA TYPE STRING,
FHDIA TYPE STRING,
KHDIA TYPE STRING,
OPDIA TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RNDIA_TXT_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_RNDIA_TXT_STR-DKAT sy-vline 
WA_RNDIA_TXT_STR-DKEY sy-vline 
WA_RNDIA_TXT_STR-LFDNR sy-vline 
WA_RNDIA_TXT_STR-DIATXT1 sy-vline 
WA_RNDIA_TXT_STR-DIATXT2 sy-vline 
WA_RNDIA_TXT_STR-DIATXT3 sy-vline 
WA_RNDIA_TXT_STR-DITXT sy-vline 
WA_RNDIA_TXT_STR-EWDIA sy-vline 
WA_RNDIA_TXT_STR-BHDIA sy-vline 
WA_RNDIA_TXT_STR-AFDIA sy-vline 
WA_RNDIA_TXT_STR-ENDIA sy-vline 
WA_RNDIA_TXT_STR-FHDIA sy-vline 
WA_RNDIA_TXT_STR-KHDIA sy-vline 
WA_RNDIA_TXT_STR-OPDIA sy-vline      INTO ld_text SEPARATED BY SPACE.

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