ABAP Select data from SAP table ICHANGEMASTR_VH into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ICHANGEMASTR_VH
*  INTO TABLE @DATA(IT_ICHANGEMASTR_VH2).
*--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_ICHANGEMASTR_VH INDEX 1 INTO DATA(WA_ICHANGEMASTR_VH2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ICHANGEMASTR_VH>-MANDT = 1.
<ICHANGEMASTR_VH>-CHANGENUMBER = 1.
<ICHANGEMASTR_VH>-CHANGENUMBERDESCRIPTION = 1.
<ICHANGEMASTR_VH>-AUTHORIZATIONGROUP = 1.
<ICHANGEMASTR_VH>-CHANGENUMBERSTATUS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ICHANGEMASTR_VH-CHANGENUMBERFUNCTION, sy-vline,
  WA_ICHANGEMASTR_VH-REASONFORCHANGETEXT, sy-vline,
  WA_ICHANGEMASTR_VH-ISTECHNICALLYRELEASED, sy-vline,
  WA_ICHANGEMASTR_VH-CHANGENUMBERRELEASEKEY, sy-vline,
  WA_ICHANGEMASTR_VH-CHANGENUMBERVALIDFROMDATE, sy-vline,
  WA_ICHANGEMASTR_VH-CHANGENUMBERCREATIONDATE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ICHANGEMASTR_VH 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_ICHANGEMASTR_VH 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_ICHANGEMASTR_VH INTO WA_ICHANGEMASTR_VH.


*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 CHANGENUMBER
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_ICHANGEMASTR_VH-CHANGENUMBER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ICHANGEMASTR_VH-CHANGENUMBER.
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_ICHANGEMASTR_VH_STR, 
MANDT TYPE STRING,
CHANGENUMBER TYPE STRING,
CHANGENUMBERDESCRIPTION TYPE STRING,
AUTHORIZATIONGROUP TYPE STRING,
CHANGENUMBERSTATUS TYPE STRING,
CHANGENUMBERFUNCTION TYPE STRING,
REASONFORCHANGETEXT TYPE STRING,
ISTECHNICALLYRELEASED TYPE STRING,
CHANGENUMBERRELEASEKEY TYPE STRING,
CHANGENUMBERVALIDFROMDATE TYPE STRING,
CHANGENUMBERCREATIONDATE TYPE STRING,
CHANGENUMBERCREATEDBYUSER TYPE STRING,
CHANGENUMBERLASTCHANGEDDATE TYPE STRING,
CHANGENUMBERLASTCHANGEDBYUSER TYPE STRING,
ISUSEDFORDATADEFINITION TYPE STRING,
CHANGENUMBERISMRKDFORDELETION TYPE STRING,
CHANGENUMBERLASTCHGDDATETIME TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ICHANGEMASTR_VH_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_ICHANGEMASTR_VH_STR-MANDT sy-vline 
WA_ICHANGEMASTR_VH_STR-CHANGENUMBER sy-vline 
WA_ICHANGEMASTR_VH_STR-CHANGENUMBERDESCRIPTION sy-vline 
WA_ICHANGEMASTR_VH_STR-AUTHORIZATIONGROUP sy-vline 
WA_ICHANGEMASTR_VH_STR-CHANGENUMBERSTATUS sy-vline 
WA_ICHANGEMASTR_VH_STR-CHANGENUMBERFUNCTION sy-vline 
WA_ICHANGEMASTR_VH_STR-REASONFORCHANGETEXT sy-vline 
WA_ICHANGEMASTR_VH_STR-ISTECHNICALLYRELEASED sy-vline 
WA_ICHANGEMASTR_VH_STR-CHANGENUMBERRELEASEKEY sy-vline 
WA_ICHANGEMASTR_VH_STR-CHANGENUMBERVALIDFROMDATE sy-vline 
WA_ICHANGEMASTR_VH_STR-CHANGENUMBERCREATIONDATE sy-vline 
WA_ICHANGEMASTR_VH_STR-CHANGENUMBERCREATEDBYUSER sy-vline 
WA_ICHANGEMASTR_VH_STR-CHANGENUMBERLASTCHANGEDDATE sy-vline 
WA_ICHANGEMASTR_VH_STR-CHANGENUMBERLASTCHANGEDBYUSER sy-vline 
WA_ICHANGEMASTR_VH_STR-ISUSEDFORDATADEFINITION sy-vline 
WA_ICHANGEMASTR_VH_STR-CHANGENUMBERISMRKDFORDELETION sy-vline 
WA_ICHANGEMASTR_VH_STR-CHANGENUMBERLASTCHGDDATETIME sy-vline      INTO ld_text SEPARATED BY SPACE.

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