ABAP Select data from SAP table DIIHSG into internal table

Get Example source ABAP code based on a different SAP table
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Below is a number of ABAP code snippets to demonstrate how to select data from SAP DIIHSG 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 DIIHSG. 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 DIIHSG 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_DIIHSG TYPE STANDARD TABLE OF DIIHSG,
      WA_DIIHSG TYPE DIIHSG,
      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: <DIIHSG> TYPE DIIHSG.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DIIHSG
*  INTO TABLE @DATA(IT_DIIHSG2).
*--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_DIIHSG INDEX 1 INTO DATA(WA_DIIHSG2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DIIHSG>-MANDT = 1.
<DIIHSG>-OBJNR = 1.
<DIIHSG>-COUNTER = 1.
<DIIHSG>-ERDAT = 1.
<DIIHSG>-ERNAM = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DIIHSG-AEDAT, sy-vline,
  WA_DIIHSG-AENAM, sy-vline,
  WA_DIIHSG-PMSOG, sy-vline,
  WA_DIIHSG-K_AF, sy-vline,
  WA_DIIHSG-K_AA, sy-vline,
  WA_DIIHSG-K_DRUCK, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DIIHSG 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_DIIHSG 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_DIIHSG INTO WA_DIIHSG.


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

*Conversion exit TPLNR, internal->external for field TPLNR
CALL FUNCTION 'CONVERSION_EXIT_TPLNR_OUTPUT'
  EXPORTING
    input =                      WA_DIIHSG-TPLNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DIIHSG-TPLNR.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit NUMCV, internal->external for field VORNR
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_DIIHSG-VORNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DIIHSG-VORNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ISOLA, internal->external for field IHASP
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_DIIHSG-IHASP
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DIIHSG-IHASP.
WRITE:/ 'New Value:', ld_input.

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

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

*Conversion exit ISOLA, internal->external for field SPRAS
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_DIIHSG-SPRAS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DIIHSG-SPRAS.
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_DIIHSG_STR, 
MANDT TYPE STRING,
OBJNR TYPE STRING,
COUNTER TYPE STRING,
ERDAT TYPE STRING,
ERNAM TYPE STRING,
AEDAT TYPE STRING,
AENAM TYPE STRING,
PMSOG TYPE STRING,
K_AF TYPE STRING,
K_AA TYPE STRING,
K_DRUCK TYPE STRING,
K_PRO TYPE STRING,
KZLTX TYPE STRING,
EQUNR TYPE STRING,
TPLNR TYPE STRING,
AUFNR TYPE STRING,
VORNR TYPE STRING,
K_OBJEKT TYPE STRING,
IHASP TYPE STRING,
K_NODEL TYPE STRING,
K_SKIP TYPE STRING,
K_ORIGIN TYPE STRING,
CLASS TYPE STRING,
LVORM TYPE STRING,
PLNTY TYPE STRING,
PLNNR TYPE STRING,
PLNAL TYPE STRING,
GNTXT TYPE STRING,
SPRAS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DIIHSG_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_DIIHSG_STR-MANDT sy-vline 
WA_DIIHSG_STR-OBJNR sy-vline 
WA_DIIHSG_STR-COUNTER sy-vline 
WA_DIIHSG_STR-ERDAT sy-vline 
WA_DIIHSG_STR-ERNAM sy-vline 
WA_DIIHSG_STR-AEDAT sy-vline 
WA_DIIHSG_STR-AENAM sy-vline 
WA_DIIHSG_STR-PMSOG sy-vline 
WA_DIIHSG_STR-K_AF sy-vline 
WA_DIIHSG_STR-K_AA sy-vline 
WA_DIIHSG_STR-K_DRUCK sy-vline 
WA_DIIHSG_STR-K_PRO sy-vline 
WA_DIIHSG_STR-KZLTX sy-vline 
WA_DIIHSG_STR-EQUNR sy-vline 
WA_DIIHSG_STR-TPLNR sy-vline 
WA_DIIHSG_STR-AUFNR sy-vline 
WA_DIIHSG_STR-VORNR sy-vline 
WA_DIIHSG_STR-K_OBJEKT sy-vline 
WA_DIIHSG_STR-IHASP sy-vline 
WA_DIIHSG_STR-K_NODEL sy-vline 
WA_DIIHSG_STR-K_SKIP sy-vline 
WA_DIIHSG_STR-K_ORIGIN sy-vline 
WA_DIIHSG_STR-CLASS sy-vline 
WA_DIIHSG_STR-LVORM sy-vline 
WA_DIIHSG_STR-PLNTY sy-vline 
WA_DIIHSG_STR-PLNNR sy-vline 
WA_DIIHSG_STR-PLNAL sy-vline 
WA_DIIHSG_STR-GNTXT sy-vline 
WA_DIIHSG_STR-SPRAS sy-vline      INTO ld_text SEPARATED BY SPACE.

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