ABAP Select data from SAP table RN2ET_PRI_REG into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RN2ET_PRI_REG 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 RN2ET_PRI_REG. 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 RN2ET_PRI_REG 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_RN2ET_PRI_REG TYPE STANDARD TABLE OF RN2ET_PRI_REG,
      WA_RN2ET_PRI_REG TYPE RN2ET_PRI_REG,
      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: <RN2ET_PRI_REG> TYPE RN2ET_PRI_REG.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RN2ET_PRI_REG.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RN2ET_PRI_REG
  INTO TABLE IT_RN2ET_PRI_REG.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RN2ET_PRI_REG
*  INTO TABLE @DATA(IT_RN2ET_PRI_REG2).
*--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_RN2ET_PRI_REG INDEX 1 INTO DATA(WA_RN2ET_PRI_REG2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RN2ET_PRI_REG ASSIGNING <RN2ET_PRI_REG>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RN2ET_PRI_REG>-RTXTLEN = 1.
<RN2ET_PRI_REG>-PW1SEQVAL = 1.
<RN2ET_PRI_REG>-PW2XBEZ = 1.
<RN2ET_PRI_REG>-PTXTEL = 1.
<RN2ET_PRI_REG>-PW1NAME = 1.

ENDLOOP.

LOOP AT IT_RN2ET_PRI_REG INTO WA_RN2ET_PRI_REG.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RN2ET_PRI_REG-PW1SUPR, sy-vline,
  WA_RN2ET_PRI_REG-PW1ABSFBEZ, sy-vline,
  WA_RN2ET_PRI_REG-PW1ABSFVAL, sy-vline,
  WA_RN2ET_PRI_REG-PW2SUPR, sy-vline,
  WA_RN2ET_PRI_REG-PW1CHFBEZ, sy-vline,
  WA_RN2ET_PRI_REG-PW1CHFVAL, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RN2ET_PRI_REG 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_RN2ET_PRI_REG 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_RN2ET_PRI_REG INTO WA_RN2ET_PRI_REG.


*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_RN2ET_PRI_REG_STR, 
RTXTLEN TYPE STRING,
PW1SEQVAL TYPE STRING,
PW2XBEZ TYPE STRING,
PTXTEL TYPE STRING,
PW1NAME TYPE STRING,
PW1SUPR TYPE STRING,
PW1ABSFBEZ TYPE STRING,
PW1ABSFVAL TYPE STRING,
PW2SUPR TYPE STRING,
PW1CHFBEZ TYPE STRING,
PW1CHFVAL TYPE STRING,
PFETTBEZ TYPE STRING,
PFETTVAL TYPE STRING,
PKURSBEZ TYPE STRING,
PKURSVAL TYPE STRING,
PULINBEZ TYPE STRING,
PULINVAL TYPE STRING,
PCHARF2BEZ TYPE STRING,
PCHARF2VAL TYPE STRING,
RTEXT TYPE STRING,
NOPRINT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RN2ET_PRI_REG_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_RN2ET_PRI_REG_STR-RTXTLEN sy-vline 
WA_RN2ET_PRI_REG_STR-PW1SEQVAL sy-vline 
WA_RN2ET_PRI_REG_STR-PW2XBEZ sy-vline 
WA_RN2ET_PRI_REG_STR-PTXTEL sy-vline 
WA_RN2ET_PRI_REG_STR-PW1NAME sy-vline 
WA_RN2ET_PRI_REG_STR-PW1SUPR sy-vline 
WA_RN2ET_PRI_REG_STR-PW1ABSFBEZ sy-vline 
WA_RN2ET_PRI_REG_STR-PW1ABSFVAL sy-vline 
WA_RN2ET_PRI_REG_STR-PW2SUPR sy-vline 
WA_RN2ET_PRI_REG_STR-PW1CHFBEZ sy-vline 
WA_RN2ET_PRI_REG_STR-PW1CHFVAL sy-vline 
WA_RN2ET_PRI_REG_STR-PFETTBEZ sy-vline 
WA_RN2ET_PRI_REG_STR-PFETTVAL sy-vline 
WA_RN2ET_PRI_REG_STR-PKURSBEZ sy-vline 
WA_RN2ET_PRI_REG_STR-PKURSVAL sy-vline 
WA_RN2ET_PRI_REG_STR-PULINBEZ sy-vline 
WA_RN2ET_PRI_REG_STR-PULINVAL sy-vline 
WA_RN2ET_PRI_REG_STR-PCHARF2BEZ sy-vline 
WA_RN2ET_PRI_REG_STR-PCHARF2VAL sy-vline 
WA_RN2ET_PRI_REG_STR-RTEXT sy-vline 
WA_RN2ET_PRI_REG_STR-NOPRINT sy-vline      INTO ld_text SEPARATED BY SPACE.

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