ABAP Select data from SAP table RPTWNHLI into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RPTWNHLI
*  INTO TABLE @DATA(IT_RPTWNHLI2).
*--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_RPTWNHLI INDEX 1 INTO DATA(WA_RPTWNHLI2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RPTWNHLI>-REP_DATE = 1.
<RPTWNHLI>-SEQ_NO = 1.
<RPTWNHLI>-TEST = 1.
<RPTWNHLI>-LIID = 1.
<RPTWNHLI>-NHIID = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RPTWNHLI-NOPER, sy-vline,
  WA_RPTWNHLI-UPMTH, sy-vline,
  WA_RPTWNHLI-UPYER, sy-vline,
  WA_RPTWNHLI-NHIMN, sy-vline,
  WA_RPTWNHLI-LIMIN, sy-vline,
  WA_RPTWNHLI-DECRE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RPTWNHLI 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_RPTWNHLI 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_RPTWNHLI INTO WA_RPTWNHLI.


*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 GJAHR, internal->external for field UPYER
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_RPTWNHLI-UPYER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RPTWNHLI-UPYER.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GJAHR, internal->external for field BGPRY
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_RPTWNHLI-BGPRY
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RPTWNHLI-BGPRY.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GJAHR, internal->external for field EDPRY
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_RPTWNHLI-EDPRY
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RPTWNHLI-EDPRY.
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_RPTWNHLI_STR, 
REP_DATE TYPE STRING,
SEQ_NO TYPE STRING,
TEST TYPE STRING,
LIID TYPE STRING,
NHIID TYPE STRING,
NOPER TYPE STRING,
UPMTH TYPE STRING,
UPYER TYPE STRING,
NHIMN TYPE STRING,
LIMIN TYPE STRING,
DECRE TYPE STRING,
UPDAT TYPE STRING,
RYEAR TYPE STRING,
RTEST TYPE STRING,
BGPRY TYPE STRING,
BGPRM TYPE STRING,
EDPRY TYPE STRING,
EDPRM TYPE STRING,
BSDAT TYPE STRING,
NOSAV TYPE STRING,
NLIFL TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RPTWNHLI_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_RPTWNHLI_STR-REP_DATE sy-vline 
WA_RPTWNHLI_STR-SEQ_NO sy-vline 
WA_RPTWNHLI_STR-TEST sy-vline 
WA_RPTWNHLI_STR-LIID sy-vline 
WA_RPTWNHLI_STR-NHIID sy-vline 
WA_RPTWNHLI_STR-NOPER sy-vline 
WA_RPTWNHLI_STR-UPMTH sy-vline 
WA_RPTWNHLI_STR-UPYER sy-vline 
WA_RPTWNHLI_STR-NHIMN sy-vline 
WA_RPTWNHLI_STR-LIMIN sy-vline 
WA_RPTWNHLI_STR-DECRE sy-vline 
WA_RPTWNHLI_STR-UPDAT sy-vline 
WA_RPTWNHLI_STR-RYEAR sy-vline 
WA_RPTWNHLI_STR-RTEST sy-vline 
WA_RPTWNHLI_STR-BGPRY sy-vline 
WA_RPTWNHLI_STR-BGPRM sy-vline 
WA_RPTWNHLI_STR-EDPRY sy-vline 
WA_RPTWNHLI_STR-EDPRM sy-vline 
WA_RPTWNHLI_STR-BSDAT sy-vline 
WA_RPTWNHLI_STR-NOSAV sy-vline 
WA_RPTWNHLI_STR-NLIFL sy-vline      INTO ld_text SEPARATED BY SPACE.

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