ABAP Select data from SAP table RNERP_FI_MC02 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RNERP_FI_MC02 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 RNERP_FI_MC02. 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 RNERP_FI_MC02 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_RNERP_FI_MC02 TYPE STANDARD TABLE OF RNERP_FI_MC02,
      WA_RNERP_FI_MC02 TYPE RNERP_FI_MC02,
      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: <RNERP_FI_MC02> TYPE RNERP_FI_MC02.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RNERP_FI_MC02.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RNERP_FI_MC02
  INTO TABLE IT_RNERP_FI_MC02.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RNERP_FI_MC02
*  INTO TABLE @DATA(IT_RNERP_FI_MC022).
*--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_RNERP_FI_MC02 INDEX 1 INTO DATA(WA_RNERP_FI_MC022).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RNERP_FI_MC02 ASSIGNING <RNERP_FI_MC02>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RNERP_FI_MC02>-POSNR = 1.
<RNERP_FI_MC02>-WERKS = 1.
<RNERP_FI_MC02>-MATNR = 1.
<RNERP_FI_MC02>-MENGE = 1.
<RNERP_FI_MC02>-MEINS = 1.

ENDLOOP.

LOOP AT IT_RNERP_FI_MC02 INTO WA_RNERP_FI_MC02.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RNERP_FI_MC02-LFDAT, sy-vline,
  WA_RNERP_FI_MC02-BADAT, sy-vline,
  WA_RNERP_FI_MC02-MBLNR, sy-vline,
  WA_RNERP_FI_MC02-MBPOS, sy-vline,
  WA_RNERP_FI_MC02-MBART, sy-vline,
  WA_RNERP_FI_MC02-BNFDT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RNERP_FI_MC02 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_RNERP_FI_MC02 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_RNERP_FI_MC02 INTO WA_RNERP_FI_MC02.


*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_RNERP_FI_MC02_STR, 
POSNR TYPE STRING,
WERKS TYPE STRING,
MATNR TYPE STRING,
MENGE TYPE STRING,
MEINS TYPE STRING,
LFDAT TYPE STRING,
BADAT TYPE STRING,
MBLNR TYPE STRING,
MBPOS TYPE STRING,
MBART TYPE STRING,
BNFDT TYPE STRING,
EAUFN TYPE STRING,
KOSTL TYPE STRING,
ERRKZ TYPE STRING,
ERNAM TYPE STRING,
COTYP TYPE STRING,
POSTX TYPE STRING,
ABLAD TYPE STRING,
LGORT TYPE STRING,
WEMPF TYPE STRING,
FTXTKZ TYPE STRING,
TXZ01 TYPE STRING,
PRIO_URG TYPE STRING,
PRIO_REQ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RNERP_FI_MC02_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_RNERP_FI_MC02_STR-POSNR sy-vline 
WA_RNERP_FI_MC02_STR-WERKS sy-vline 
WA_RNERP_FI_MC02_STR-MATNR sy-vline 
WA_RNERP_FI_MC02_STR-MENGE sy-vline 
WA_RNERP_FI_MC02_STR-MEINS sy-vline 
WA_RNERP_FI_MC02_STR-LFDAT sy-vline 
WA_RNERP_FI_MC02_STR-BADAT sy-vline 
WA_RNERP_FI_MC02_STR-MBLNR sy-vline 
WA_RNERP_FI_MC02_STR-MBPOS sy-vline 
WA_RNERP_FI_MC02_STR-MBART sy-vline 
WA_RNERP_FI_MC02_STR-BNFDT sy-vline 
WA_RNERP_FI_MC02_STR-EAUFN sy-vline 
WA_RNERP_FI_MC02_STR-KOSTL sy-vline 
WA_RNERP_FI_MC02_STR-ERRKZ sy-vline 
WA_RNERP_FI_MC02_STR-ERNAM sy-vline 
WA_RNERP_FI_MC02_STR-COTYP sy-vline 
WA_RNERP_FI_MC02_STR-POSTX sy-vline 
WA_RNERP_FI_MC02_STR-ABLAD sy-vline 
WA_RNERP_FI_MC02_STR-LGORT sy-vline 
WA_RNERP_FI_MC02_STR-WEMPF sy-vline 
WA_RNERP_FI_MC02_STR-FTXTKZ sy-vline 
WA_RNERP_FI_MC02_STR-TXZ01 sy-vline 
WA_RNERP_FI_MC02_STR-PRIO_URG sy-vline 
WA_RNERP_FI_MC02_STR-PRIO_REQ sy-vline      INTO ld_text SEPARATED BY SPACE.

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