ABAP Select data from SAP table IHC_DB_DSP_TRAPO into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM IHC_DB_DSP_TRAPO
*  INTO TABLE @DATA(IT_IHC_DB_DSP_TRAPO2).
*--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_IHC_DB_DSP_TRAPO INDEX 1 INTO DATA(WA_IHC_DB_DSP_TRAPO2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<IHC_DB_DSP_TRAPO>-MANDT = 1.
<IHC_DB_DSP_TRAPO>-DOCNO = 1.
<IHC_DB_DSP_TRAPO>-FRACCT = 1.
<IHC_DB_DSP_TRAPO>-TOACCT = 1.
<IHC_DB_DSP_TRAPO>-PSTKY = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_IHC_DB_DSP_TRAPO-TCODE, sy-vline,
  WA_IHC_DB_DSP_TRAPO-DOCTYP, sy-vline,
  WA_IHC_DB_DSP_TRAPO-DESCR, sy-vline,
  WA_IHC_DB_DSP_TRAPO-CURR, sy-vline,
  WA_IHC_DB_DSP_TRAPO-AMT, sy-vline,
  WA_IHC_DB_DSP_TRAPO-SELFD, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_IHC_DB_DSP_TRAPO 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_IHC_DB_DSP_TRAPO 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_IHC_DB_DSP_TRAPO INTO WA_IHC_DB_DSP_TRAPO.


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

*Conversion exit ALPHA, internal->external for field TRPRTN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_IHC_DB_DSP_TRAPO-TRPRTN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IHC_DB_DSP_TRAPO-TRPRTN.
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_IHC_DB_DSP_TRAPO_STR, 
MANDT TYPE STRING,
DOCNO TYPE STRING,
FRACCT TYPE STRING,
TOACCT TYPE STRING,
PSTKY TYPE STRING,
TCODE TYPE STRING,
DOCTYP TYPE STRING,
DESCR TYPE STRING,
CURR TYPE STRING,
AMT TYPE STRING,
SELFD TYPE STRING,
INTEXTTRANS TYPE STRING,
TRPRTN TYPE STRING,
LINO TYPE STRING,END OF T_EKKO_STR.
DATA: WA_IHC_DB_DSP_TRAPO_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_IHC_DB_DSP_TRAPO_STR-MANDT sy-vline 
WA_IHC_DB_DSP_TRAPO_STR-DOCNO sy-vline 
WA_IHC_DB_DSP_TRAPO_STR-FRACCT sy-vline 
WA_IHC_DB_DSP_TRAPO_STR-TOACCT sy-vline 
WA_IHC_DB_DSP_TRAPO_STR-PSTKY sy-vline 
WA_IHC_DB_DSP_TRAPO_STR-TCODE sy-vline 
WA_IHC_DB_DSP_TRAPO_STR-DOCTYP sy-vline 
WA_IHC_DB_DSP_TRAPO_STR-DESCR sy-vline 
WA_IHC_DB_DSP_TRAPO_STR-CURR sy-vline 
WA_IHC_DB_DSP_TRAPO_STR-AMT sy-vline 
WA_IHC_DB_DSP_TRAPO_STR-SELFD sy-vline 
WA_IHC_DB_DSP_TRAPO_STR-INTEXTTRANS sy-vline 
WA_IHC_DB_DSP_TRAPO_STR-TRPRTN sy-vline 
WA_IHC_DB_DSP_TRAPO_STR-LINO sy-vline      INTO ld_text SEPARATED BY SPACE.

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