ABAP Select data from SAP table ICLB_DIHDR into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ICLB_DIHDR
*  INTO TABLE @DATA(IT_ICLB_DIHDR2).
*--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_ICLB_DIHDR INDEX 1 INTO DATA(WA_ICLB_DIHDR2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ICLB_DIHDR>-AKTYP = 1.
<ICLB_DIHDR>-RLTP1 = 1.
<ICLB_DIHDR>-RLTP2 = 1.
<ICLB_DIHDR>-RLTP3 = 1.
<ICLB_DIHDR>-RLTP4 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ICLB_DIHDR-RLTP5, sy-vline,
  WA_ICLB_DIHDR-RLTP6, sy-vline,
  WA_ICLB_DIHDR-RLTP7, sy-vline,
  WA_ICLB_DIHDR-RLTP8, sy-vline,
  WA_ICLB_DIHDR-RLTP9, sy-vline,
  WA_ICLB_DIHDR-SERVCATID, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ICLB_DIHDR 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_ICLB_DIHDR 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_ICLB_DIHDR INTO WA_ICLB_DIHDR.


*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_ICLB_DIHDR_STR, 
AKTYP TYPE STRING,
RLTP1 TYPE STRING,
RLTP2 TYPE STRING,
RLTP3 TYPE STRING,
RLTP4 TYPE STRING,
RLTP5 TYPE STRING,
RLTP6 TYPE STRING,
RLTP7 TYPE STRING,
RLTP8 TYPE STRING,
RLTP9 TYPE STRING,
SERVCATID TYPE STRING,
SC_VARIANT TYPE STRING,
SCPOSID_EXT TYPE STRING,
SCPOS_TYPE_ENTRY TYPE STRING,
SCPOSID_INT TYPE STRING,
VALID_TIME TYPE STRING,
COUNTRY TYPE STRING,
REGION TYPE STRING,
DISABILITY_CLASS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ICLB_DIHDR_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_ICLB_DIHDR_STR-AKTYP sy-vline 
WA_ICLB_DIHDR_STR-RLTP1 sy-vline 
WA_ICLB_DIHDR_STR-RLTP2 sy-vline 
WA_ICLB_DIHDR_STR-RLTP3 sy-vline 
WA_ICLB_DIHDR_STR-RLTP4 sy-vline 
WA_ICLB_DIHDR_STR-RLTP5 sy-vline 
WA_ICLB_DIHDR_STR-RLTP6 sy-vline 
WA_ICLB_DIHDR_STR-RLTP7 sy-vline 
WA_ICLB_DIHDR_STR-RLTP8 sy-vline 
WA_ICLB_DIHDR_STR-RLTP9 sy-vline 
WA_ICLB_DIHDR_STR-SERVCATID sy-vline 
WA_ICLB_DIHDR_STR-SC_VARIANT sy-vline 
WA_ICLB_DIHDR_STR-SCPOSID_EXT sy-vline 
WA_ICLB_DIHDR_STR-SCPOS_TYPE_ENTRY sy-vline 
WA_ICLB_DIHDR_STR-SCPOSID_INT sy-vline 
WA_ICLB_DIHDR_STR-VALID_TIME sy-vline 
WA_ICLB_DIHDR_STR-COUNTRY sy-vline 
WA_ICLB_DIHDR_STR-REGION sy-vline 
WA_ICLB_DIHDR_STR-DISABILITY_CLASS sy-vline      INTO ld_text SEPARATED BY SPACE.

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