ABAP Select data from SAP table HIST_STRUC into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM HIST_STRUC
*  INTO TABLE @DATA(IT_HIST_STRUC2).
*--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_HIST_STRUC INDEX 1 INTO DATA(WA_HIST_STRUC2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<HIST_STRUC>-PLNTY = 1.
<HIST_STRUC>-PLNNR = 1.
<HIST_STRUC>-PLNAL = 1.
<HIST_STRUC>-DATUV = 1.
<HIST_STRUC>-OBJ = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_HIST_STRUC-AENNR, sy-vline,
ENDLOOP.
   
*Add any further fields from structure WA_HIST_STRUC 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_HIST_STRUC 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_HIST_STRUC INTO WA_HIST_STRUC.


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

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

*Conversion exit ALPHA, internal->external for field AENNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_HIST_STRUC-AENNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_HIST_STRUC-AENNR.
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_HIST_STRUC_STR, 
PLNTY TYPE STRING,
PLNNR TYPE STRING,
PLNAL TYPE STRING,
DATUV TYPE STRING,
OBJ TYPE STRING,
AENNR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_HIST_STRUC_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_HIST_STRUC_STR-PLNTY sy-vline 
WA_HIST_STRUC_STR-PLNNR sy-vline 
WA_HIST_STRUC_STR-PLNAL sy-vline 
WA_HIST_STRUC_STR-DATUV sy-vline 
WA_HIST_STRUC_STR-OBJ sy-vline 
WA_HIST_STRUC_STR-AENNR sy-vline      INTO ld_text SEPARATED BY SPACE.

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