ABAP Select data from SAP table TREE_HIST into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TREE_HIST
*  INTO TABLE @DATA(IT_TREE_HIST2).
*--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_TREE_HIST INDEX 1 INTO DATA(WA_TREE_HIST2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TREE_HIST>-LIFNR = 1.
<TREE_HIST>-EBELN = 1.
<TREE_HIST>-EBELP = 1.
<TREE_HIST>-BEWTP = 1.
<TREE_HIST>-BEWTK = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TREE_HIST-BEWTL, sy-vline,
  WA_TREE_HIST-PSTYP, sy-vline,
  WA_TREE_HIST-LEBRE, sy-vline,
  WA_TREE_HIST-WEBRE, sy-vline,
  WA_TREE_HIST-WEPOS, sy-vline,
  WA_TREE_HIST-VGABE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TREE_HIST 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_TREE_HIST 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_TREE_HIST INTO WA_TREE_HIST.


*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 LIFNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TREE_HIST-LIFNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TREE_HIST-LIFNR.
WRITE:/ 'New Value:', ld_input.

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

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

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

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

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

*Conversion exit GJAHR, internal->external for field GJAHR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_TREE_HIST-GJAHR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TREE_HIST-GJAHR.
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_TREE_HIST_STR, 
LIFNR TYPE STRING,
EBELN TYPE STRING,
EBELP TYPE STRING,
BEWTP TYPE STRING,
BEWTK TYPE STRING,
BEWTL TYPE STRING,
PSTYP TYPE STRING,
LEBRE TYPE STRING,
WEBRE TYPE STRING,
WEPOS TYPE STRING,
VGABE TYPE STRING,
MENGE TYPE STRING,
WRBTR TYPE STRING,
DMBTR TYPE STRING,
MEINS TYPE STRING,
WAERS TYPE STRING,
HSWAE TYPE STRING,
BELNR TYPE STRING,
BUDAT TYPE STRING,
QUELLE TYPE STRING,
SHKZG TYPE STRING,
VORZ TYPE STRING,
NAME1 TYPE STRING,
XBLNR TYPE STRING,
LFBNR TYPE STRING,
LFPOS TYPE STRING,
LFGJA TYPE STRING,
PACKNO TYPE STRING,
INTROW TYPE STRING,
TXZ01 TYPE STRING,
SUWRB TYPE STRING,
VRTKZ TYPE STRING,
ZEKKN TYPE STRING,
GJAHR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TREE_HIST_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_TREE_HIST_STR-LIFNR sy-vline 
WA_TREE_HIST_STR-EBELN sy-vline 
WA_TREE_HIST_STR-EBELP sy-vline 
WA_TREE_HIST_STR-BEWTP sy-vline 
WA_TREE_HIST_STR-BEWTK sy-vline 
WA_TREE_HIST_STR-BEWTL sy-vline 
WA_TREE_HIST_STR-PSTYP sy-vline 
WA_TREE_HIST_STR-LEBRE sy-vline 
WA_TREE_HIST_STR-WEBRE sy-vline 
WA_TREE_HIST_STR-WEPOS sy-vline 
WA_TREE_HIST_STR-VGABE sy-vline 
WA_TREE_HIST_STR-MENGE sy-vline 
WA_TREE_HIST_STR-WRBTR sy-vline 
WA_TREE_HIST_STR-DMBTR sy-vline 
WA_TREE_HIST_STR-MEINS sy-vline 
WA_TREE_HIST_STR-WAERS sy-vline 
WA_TREE_HIST_STR-HSWAE sy-vline 
WA_TREE_HIST_STR-BELNR sy-vline 
WA_TREE_HIST_STR-BUDAT sy-vline 
WA_TREE_HIST_STR-QUELLE sy-vline 
WA_TREE_HIST_STR-SHKZG sy-vline 
WA_TREE_HIST_STR-VORZ sy-vline 
WA_TREE_HIST_STR-NAME1 sy-vline 
WA_TREE_HIST_STR-XBLNR sy-vline 
WA_TREE_HIST_STR-LFBNR sy-vline 
WA_TREE_HIST_STR-LFPOS sy-vline 
WA_TREE_HIST_STR-LFGJA sy-vline 
WA_TREE_HIST_STR-PACKNO sy-vline 
WA_TREE_HIST_STR-INTROW sy-vline 
WA_TREE_HIST_STR-TXZ01 sy-vline 
WA_TREE_HIST_STR-SUWRB sy-vline 
WA_TREE_HIST_STR-VRTKZ sy-vline 
WA_TREE_HIST_STR-ZEKKN sy-vline 
WA_TREE_HIST_STR-GJAHR sy-vline      INTO ld_text SEPARATED BY SPACE.

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