ABAP Select data from SAP table ROIU_PR_NTWKWC_A1 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP ROIU_PR_NTWKWC_A1 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 ROIU_PR_NTWKWC_A1. 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 ROIU_PR_NTWKWC_A1 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_ROIU_PR_NTWKWC_A1 TYPE STANDARD TABLE OF ROIU_PR_NTWKWC_A1,
      WA_ROIU_PR_NTWKWC_A1 TYPE ROIU_PR_NTWKWC_A1,
      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: <ROIU_PR_NTWKWC_A1> TYPE ROIU_PR_NTWKWC_A1.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_ROIU_PR_NTWKWC_A1.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM ROIU_PR_NTWKWC_A1
  INTO TABLE IT_ROIU_PR_NTWKWC_A1.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ROIU_PR_NTWKWC_A1
*  INTO TABLE @DATA(IT_ROIU_PR_NTWKWC_A12).
*--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_ROIU_PR_NTWKWC_A1 INDEX 1 INTO DATA(WA_ROIU_PR_NTWKWC_A12).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_ROIU_PR_NTWKWC_A1 ASSIGNING <ROIU_PR_NTWKWC_A1>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ROIU_PR_NTWKWC_A1>-INJECT_VOL = 1.
<ROIU_PR_NTWKWC_A1>-THEO_RESIDUE = 1.
<ROIU_PR_NTWKWC_A1>-BEG_REM_INV = 1.
<ROIU_PR_NTWKWC_A1>-BEG_INV_QY = 1.
<ROIU_PR_NTWKWC_A1>-TOP_LEVEL_MTR = 1.

ENDLOOP.

LOOP AT IT_ROIU_PR_NTWKWC_A1 INTO WA_ROIU_PR_NTWKWC_A1.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ROIU_PR_NTWKWC_A1-GP_METERED_PROD, sy-vline,
  WA_ROIU_PR_NTWKWC_A1-METERED_PROD, sy-vline,
  WA_ROIU_PR_NTWKWC_A1-CALCD_PROD, sy-vline,
  WA_ROIU_PR_NTWKWC_A1-TOTAL_EXTR_LOSS, sy-vline,
  WA_ROIU_PR_NTWKWC_A1-TOTAL_SALES_QY, sy-vline,
  WA_ROIU_PR_NTWKWC_A1-TOTAL_OFFLSE_QY, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ROIU_PR_NTWKWC_A1 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_ROIU_PR_NTWKWC_A1 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_ROIU_PR_NTWKWC_A1 INTO WA_ROIU_PR_NTWKWC_A1.


*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.

*Conversion exit ALPHA, internal->external for field LO_PRES_MP
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_ROIU_PR_NTWKWC_A1-LO_PRES_MP
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ROIU_PR_NTWKWC_A1-LO_PRES_MP.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field HI_PRES_MP
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_ROIU_PR_NTWKWC_A1-HI_PRES_MP
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ROIU_PR_NTWKWC_A1-HI_PRES_MP.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field STD_VOL_U
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_ROIU_PR_NTWKWC_A1-STD_VOL_U
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ROIU_PR_NTWKWC_A1-STD_VOL_U.
WRITE:/ 'New Value:', ld_input.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_ROIU_PR_NTWKWC_A1_STR, 
INJECT_VOL TYPE STRING,
THEO_RESIDUE TYPE STRING,
BEG_REM_INV TYPE STRING,
BEG_INV_QY TYPE STRING,
TOP_LEVEL_MTR TYPE STRING,
GP_METERED_PROD TYPE STRING,
METERED_PROD TYPE STRING,
CALCD_PROD TYPE STRING,
TOTAL_EXTR_LOSS TYPE STRING,
TOTAL_SALES_QY TYPE STRING,
TOTAL_OFFLSE_QY TYPE STRING,
TOTAL_ONLSE_QY TYPE STRING,
LOAD_OIL_EFF_DT TYPE STRING,
LOAD_OIL_FL TYPE STRING,
ADJ_LO_PRES_QY TYPE STRING,
ADJ_HI_PRES_QY TYPE STRING,
LO_PRES_QY TYPE STRING,
HI_PRES_QY TYPE STRING,
LO_PRES_MP TYPE STRING,
HI_PRES_MP TYPE STRING,
WC_HAS_HILO_PRES TYPE STRING,
SUP_PCVT_SPL_FL TYPE STRING,
SUP_CONTAM_PD_FL TYPE STRING,
WC_IS_MTRD TYPE STRING,
PRD_HRS TYPE STRING,
ALLOC_VOL TYPE STRING,
STD_VOL_U TYPE STRING,
THEO_RAT_FAC TYPE STRING,
THEO_QY TYPE STRING,
ORIG_THEO_QY TYPE STRING,
ADJ_THEO_QY TYPE STRING,
THEO_QY_SPLIT TYPE STRING,
UP_SPLIT_QY TYPE STRING,
UP_SPLIT_QY_CALC TYPE STRING,
UP_SPLIT_QY_HOLD TYPE STRING,
GL_REC_QY TYPE STRING,
BTU_FAC_VOL TYPE STRING,
VRU_THEO_QY TYPE STRING,
NGL_C1C2TRA_QY TYPE STRING,
SUM_NGL_QY TYPE STRING,
SUM_NGL_MOL_QY TYPE STRING,
TABIX_COTB TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ROIU_PR_NTWKWC_A1_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_ROIU_PR_NTWKWC_A1_STR-INJECT_VOL sy-vline 
WA_ROIU_PR_NTWKWC_A1_STR-THEO_RESIDUE sy-vline 
WA_ROIU_PR_NTWKWC_A1_STR-BEG_REM_INV sy-vline 
WA_ROIU_PR_NTWKWC_A1_STR-BEG_INV_QY sy-vline 
WA_ROIU_PR_NTWKWC_A1_STR-TOP_LEVEL_MTR sy-vline 
WA_ROIU_PR_NTWKWC_A1_STR-GP_METERED_PROD sy-vline 
WA_ROIU_PR_NTWKWC_A1_STR-METERED_PROD sy-vline 
WA_ROIU_PR_NTWKWC_A1_STR-CALCD_PROD sy-vline 
WA_ROIU_PR_NTWKWC_A1_STR-TOTAL_EXTR_LOSS sy-vline 
WA_ROIU_PR_NTWKWC_A1_STR-TOTAL_SALES_QY sy-vline 
WA_ROIU_PR_NTWKWC_A1_STR-TOTAL_OFFLSE_QY sy-vline 
WA_ROIU_PR_NTWKWC_A1_STR-TOTAL_ONLSE_QY sy-vline 
WA_ROIU_PR_NTWKWC_A1_STR-LOAD_OIL_EFF_DT sy-vline 
WA_ROIU_PR_NTWKWC_A1_STR-LOAD_OIL_FL sy-vline 
WA_ROIU_PR_NTWKWC_A1_STR-ADJ_LO_PRES_QY sy-vline 
WA_ROIU_PR_NTWKWC_A1_STR-ADJ_HI_PRES_QY sy-vline 
WA_ROIU_PR_NTWKWC_A1_STR-LO_PRES_QY sy-vline 
WA_ROIU_PR_NTWKWC_A1_STR-HI_PRES_QY sy-vline 
WA_ROIU_PR_NTWKWC_A1_STR-LO_PRES_MP sy-vline 
WA_ROIU_PR_NTWKWC_A1_STR-HI_PRES_MP sy-vline 
WA_ROIU_PR_NTWKWC_A1_STR-WC_HAS_HILO_PRES sy-vline 
WA_ROIU_PR_NTWKWC_A1_STR-SUP_PCVT_SPL_FL sy-vline 
WA_ROIU_PR_NTWKWC_A1_STR-SUP_CONTAM_PD_FL sy-vline 
WA_ROIU_PR_NTWKWC_A1_STR-WC_IS_MTRD sy-vline 
WA_ROIU_PR_NTWKWC_A1_STR-PRD_HRS sy-vline 
WA_ROIU_PR_NTWKWC_A1_STR-ALLOC_VOL sy-vline 
WA_ROIU_PR_NTWKWC_A1_STR-STD_VOL_U sy-vline 
WA_ROIU_PR_NTWKWC_A1_STR-THEO_RAT_FAC sy-vline 
WA_ROIU_PR_NTWKWC_A1_STR-THEO_QY sy-vline 
WA_ROIU_PR_NTWKWC_A1_STR-ORIG_THEO_QY sy-vline 
WA_ROIU_PR_NTWKWC_A1_STR-ADJ_THEO_QY sy-vline 
WA_ROIU_PR_NTWKWC_A1_STR-THEO_QY_SPLIT sy-vline 
WA_ROIU_PR_NTWKWC_A1_STR-UP_SPLIT_QY sy-vline 
WA_ROIU_PR_NTWKWC_A1_STR-UP_SPLIT_QY_CALC sy-vline 
WA_ROIU_PR_NTWKWC_A1_STR-UP_SPLIT_QY_HOLD sy-vline 
WA_ROIU_PR_NTWKWC_A1_STR-GL_REC_QY sy-vline 
WA_ROIU_PR_NTWKWC_A1_STR-BTU_FAC_VOL sy-vline 
WA_ROIU_PR_NTWKWC_A1_STR-VRU_THEO_QY sy-vline 
WA_ROIU_PR_NTWKWC_A1_STR-NGL_C1C2TRA_QY sy-vline 
WA_ROIU_PR_NTWKWC_A1_STR-SUM_NGL_QY sy-vline 
WA_ROIU_PR_NTWKWC_A1_STR-SUM_NGL_MOL_QY sy-vline 
WA_ROIU_PR_NTWKWC_A1_STR-TABIX_COTB sy-vline      INTO ld_text SEPARATED BY SPACE.

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