ABAP Select data from SAP table WRF_PPW_TREEKEYREF_STY into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WRF_PPW_TREEKEYREF_STY
*  INTO TABLE @DATA(IT_WRF_PPW_TREEKEYREF_STY2).
*--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_WRF_PPW_TREEKEYREF_STY INDEX 1 INTO DATA(WA_WRF_PPW_TREEKEYREF_STY2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WRF_PPW_TREEKEYREF_STY>-H01 = 1.
<WRF_PPW_TREEKEYREF_STY>-H02 = 1.
<WRF_PPW_TREEKEYREF_STY>-H03 = 1.
<WRF_PPW_TREEKEYREF_STY>-H04 = 1.
<WRF_PPW_TREEKEYREF_STY>-H05 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WRF_PPW_TREEKEYREF_STY-H06, sy-vline,
  WA_WRF_PPW_TREEKEYREF_STY-H07, sy-vline,
  WA_WRF_PPW_TREEKEYREF_STY-H08, sy-vline,
  WA_WRF_PPW_TREEKEYREF_STY-H09, sy-vline,
  WA_WRF_PPW_TREEKEYREF_STY-H10, sy-vline,
  WA_WRF_PPW_TREEKEYREF_STY-H11, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WRF_PPW_TREEKEYREF_STY 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_WRF_PPW_TREEKEYREF_STY 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_WRF_PPW_TREEKEYREF_STY INTO WA_WRF_PPW_TREEKEYREF_STY.


*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_WRF_PPW_TREEKEYREF_STY_STR, 
H01 TYPE STRING,
H02 TYPE STRING,
H03 TYPE STRING,
H04 TYPE STRING,
H05 TYPE STRING,
H06 TYPE STRING,
H07 TYPE STRING,
H08 TYPE STRING,
H09 TYPE STRING,
H10 TYPE STRING,
H11 TYPE STRING,
H12 TYPE STRING,
H13 TYPE STRING,
H14 TYPE STRING,
H15 TYPE STRING,
H16 TYPE STRING,
H17 TYPE STRING,
H18 TYPE STRING,
H19 TYPE STRING,
H20 TYPE STRING,
T01 TYPE STRING,
T02 TYPE STRING,
T03 TYPE STRING,
T04 TYPE STRING,
T05 TYPE STRING,
T06 TYPE STRING,
T07 TYPE STRING,
T08 TYPE STRING,
T09 TYPE STRING,
T10 TYPE STRING,
T11 TYPE STRING,
T12 TYPE STRING,
T13 TYPE STRING,
T14 TYPE STRING,
T15 TYPE STRING,
T16 TYPE STRING,
T17 TYPE STRING,
T18 TYPE STRING,
T19 TYPE STRING,
T20 TYPE STRING,
FIELDNAME01 TYPE STRING,
FIELDNAME02 TYPE STRING,
FIELDNAME03 TYPE STRING,
FIELDNAME04 TYPE STRING,
FIELDNAME05 TYPE STRING,
FIELDNAME06 TYPE STRING,
FIELDNAME07 TYPE STRING,
FIELDNAME08 TYPE STRING,
FIELDNAME09 TYPE STRING,
FIELDNAME10 TYPE STRING,
FIELDNAME11 TYPE STRING,
FIELDNAME12 TYPE STRING,
FIELDNAME13 TYPE STRING,
FIELDNAME14 TYPE STRING,
FIELDNAME15 TYPE STRING,
FIELDNAME16 TYPE STRING,
FIELDNAME17 TYPE STRING,
FIELDNAME18 TYPE STRING,
FIELDNAME19 TYPE STRING,
FIELDNAME20 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WRF_PPW_TREEKEYREF_STY_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_WRF_PPW_TREEKEYREF_STY_STR-H01 sy-vline 
WA_WRF_PPW_TREEKEYREF_STY_STR-H02 sy-vline 
WA_WRF_PPW_TREEKEYREF_STY_STR-H03 sy-vline 
WA_WRF_PPW_TREEKEYREF_STY_STR-H04 sy-vline 
WA_WRF_PPW_TREEKEYREF_STY_STR-H05 sy-vline 
WA_WRF_PPW_TREEKEYREF_STY_STR-H06 sy-vline 
WA_WRF_PPW_TREEKEYREF_STY_STR-H07 sy-vline 
WA_WRF_PPW_TREEKEYREF_STY_STR-H08 sy-vline 
WA_WRF_PPW_TREEKEYREF_STY_STR-H09 sy-vline 
WA_WRF_PPW_TREEKEYREF_STY_STR-H10 sy-vline 
WA_WRF_PPW_TREEKEYREF_STY_STR-H11 sy-vline 
WA_WRF_PPW_TREEKEYREF_STY_STR-H12 sy-vline 
WA_WRF_PPW_TREEKEYREF_STY_STR-H13 sy-vline 
WA_WRF_PPW_TREEKEYREF_STY_STR-H14 sy-vline 
WA_WRF_PPW_TREEKEYREF_STY_STR-H15 sy-vline 
WA_WRF_PPW_TREEKEYREF_STY_STR-H16 sy-vline 
WA_WRF_PPW_TREEKEYREF_STY_STR-H17 sy-vline 
WA_WRF_PPW_TREEKEYREF_STY_STR-H18 sy-vline 
WA_WRF_PPW_TREEKEYREF_STY_STR-H19 sy-vline 
WA_WRF_PPW_TREEKEYREF_STY_STR-H20 sy-vline 
WA_WRF_PPW_TREEKEYREF_STY_STR-T01 sy-vline 
WA_WRF_PPW_TREEKEYREF_STY_STR-T02 sy-vline 
WA_WRF_PPW_TREEKEYREF_STY_STR-T03 sy-vline 
WA_WRF_PPW_TREEKEYREF_STY_STR-T04 sy-vline 
WA_WRF_PPW_TREEKEYREF_STY_STR-T05 sy-vline 
WA_WRF_PPW_TREEKEYREF_STY_STR-T06 sy-vline 
WA_WRF_PPW_TREEKEYREF_STY_STR-T07 sy-vline 
WA_WRF_PPW_TREEKEYREF_STY_STR-T08 sy-vline 
WA_WRF_PPW_TREEKEYREF_STY_STR-T09 sy-vline 
WA_WRF_PPW_TREEKEYREF_STY_STR-T10 sy-vline 
WA_WRF_PPW_TREEKEYREF_STY_STR-T11 sy-vline 
WA_WRF_PPW_TREEKEYREF_STY_STR-T12 sy-vline 
WA_WRF_PPW_TREEKEYREF_STY_STR-T13 sy-vline 
WA_WRF_PPW_TREEKEYREF_STY_STR-T14 sy-vline 
WA_WRF_PPW_TREEKEYREF_STY_STR-T15 sy-vline 
WA_WRF_PPW_TREEKEYREF_STY_STR-T16 sy-vline 
WA_WRF_PPW_TREEKEYREF_STY_STR-T17 sy-vline 
WA_WRF_PPW_TREEKEYREF_STY_STR-T18 sy-vline 
WA_WRF_PPW_TREEKEYREF_STY_STR-T19 sy-vline 
WA_WRF_PPW_TREEKEYREF_STY_STR-T20 sy-vline 
WA_WRF_PPW_TREEKEYREF_STY_STR-FIELDNAME01 sy-vline 
WA_WRF_PPW_TREEKEYREF_STY_STR-FIELDNAME02 sy-vline 
WA_WRF_PPW_TREEKEYREF_STY_STR-FIELDNAME03 sy-vline 
WA_WRF_PPW_TREEKEYREF_STY_STR-FIELDNAME04 sy-vline 
WA_WRF_PPW_TREEKEYREF_STY_STR-FIELDNAME05 sy-vline 
WA_WRF_PPW_TREEKEYREF_STY_STR-FIELDNAME06 sy-vline 
WA_WRF_PPW_TREEKEYREF_STY_STR-FIELDNAME07 sy-vline 
WA_WRF_PPW_TREEKEYREF_STY_STR-FIELDNAME08 sy-vline 
WA_WRF_PPW_TREEKEYREF_STY_STR-FIELDNAME09 sy-vline 
WA_WRF_PPW_TREEKEYREF_STY_STR-FIELDNAME10 sy-vline 
WA_WRF_PPW_TREEKEYREF_STY_STR-FIELDNAME11 sy-vline 
WA_WRF_PPW_TREEKEYREF_STY_STR-FIELDNAME12 sy-vline 
WA_WRF_PPW_TREEKEYREF_STY_STR-FIELDNAME13 sy-vline 
WA_WRF_PPW_TREEKEYREF_STY_STR-FIELDNAME14 sy-vline 
WA_WRF_PPW_TREEKEYREF_STY_STR-FIELDNAME15 sy-vline 
WA_WRF_PPW_TREEKEYREF_STY_STR-FIELDNAME16 sy-vline 
WA_WRF_PPW_TREEKEYREF_STY_STR-FIELDNAME17 sy-vline 
WA_WRF_PPW_TREEKEYREF_STY_STR-FIELDNAME18 sy-vline 
WA_WRF_PPW_TREEKEYREF_STY_STR-FIELDNAME19 sy-vline 
WA_WRF_PPW_TREEKEYREF_STY_STR-FIELDNAME20 sy-vline      INTO ld_text SEPARATED BY SPACE.

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