ABAP Select data from SAP table /ISDFPS/MCHG_WD_ALV into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP /ISDFPS/MCHG_WD_ALV 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 /ISDFPS/MCHG_WD_ALV. 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 /ISDFPS/MCHG_WD_ALV 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_/ISDFPS/MCHG_WD_ALV TYPE STANDARD TABLE OF /ISDFPS/MCHG_WD_ALV,
      WA_/ISDFPS/MCHG_WD_ALV TYPE /ISDFPS/MCHG_WD_ALV,
      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: </ISDFPS/MCHG_WD_ALV> TYPE /ISDFPS/MCHG_WD_ALV.

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

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM /ISDFPS/MCHG_WD_ALV
  INTO TABLE IT_/ISDFPS/MCHG_WD_ALV.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /ISDFPS/MCHG_WD_ALV
*  INTO TABLE @DATA(IT_/ISDFPS/MCHG_WD_ALV2).
*--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_/ISDFPS/MCHG_WD_ALV INDEX 1 INTO DATA(WA_/ISDFPS/MCHG_WD_ALV2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_/ISDFPS/MCHG_WD_ALV ASSIGNING </ISDFPS/MCHG_WD_ALV>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
</ISDFPS/MCHG_WD_ALV>-MANDT = 1.
</ISDFPS/MCHG_WD_ALV>-OBJID = 1.
</ISDFPS/MCHG_WD_ALV>-SHORT = 1.
</ISDFPS/MCHG_WD_ALV>-STEXT = 1.
</ISDFPS/MCHG_WD_ALV>-WERKS = 1.

ENDLOOP.

LOOP AT IT_/ISDFPS/MCHG_WD_ALV INTO WA_/ISDFPS/MCHG_WD_ALV.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/ISDFPS/MCHG_WD_ALV-BERID, sy-vline,
  WA_/ISDFPS/MCHG_WD_ALV-BERTX, sy-vline,
  WA_/ISDFPS/MCHG_WD_ALV-LGORT, sy-vline,
  WA_/ISDFPS/MCHG_WD_ALV-LGOBE, sy-vline,
  WA_/ISDFPS/MCHG_WD_ALV-LGORT_S, sy-vline,
  WA_/ISDFPS/MCHG_WD_ALV-SLOC_TYPE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/ISDFPS/MCHG_WD_ALV 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_/ISDFPS/MCHG_WD_ALV 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_/ISDFPS/MCHG_WD_ALV INTO WA_/ISDFPS/MCHG_WD_ALV.


*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 LIFNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/ISDFPS/MCHG_WD_ALV-LIFNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/ISDFPS/MCHG_WD_ALV-LIFNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KUNNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/ISDFPS/MCHG_WD_ALV-KUNNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/ISDFPS/MCHG_WD_ALV-KUNNR.
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_/ISDFPS/MCHG_WD_ALV_STR, 
MANDT TYPE STRING,
OBJID TYPE STRING,
SHORT TYPE STRING,
STEXT TYPE STRING,
WERKS TYPE STRING,
BERID TYPE STRING,
BERTX TYPE STRING,
LGORT TYPE STRING,
LGOBE TYPE STRING,
LGORT_S TYPE STRING,
SLOC_TYPE TYPE STRING,
REC_LGORT TYPE STRING,
LGORT_HU TYPE STRING,
LGOBE_HU TYPE STRING,
XHUPF TYPE STRING,
PARLG TYPE STRING,
LGNUM TYPE STRING,
SPART TYPE STRING,
VKORG TYPE STRING,
VTWEG TYPE STRING,
VSTEL TYPE STRING,
LIFNR TYPE STRING,
KUNNR TYPE STRING,
EKORG TYPE STRING,
EKOTX TYPE STRING,
EKGRP TYPE STRING,
EKNAM TYPE STRING,
MLOKZ TYPE STRING,
PRIO TYPE STRING,
LOGLEV TYPE STRING,
XLONG TYPE STRING,
XBUFX TYPE STRING,
DISKZ TYPE STRING,
XBLGO TYPE STRING,
XRESS TYPE STRING,
OBJID_MAT TYPE STRING,
OTYPE TYPE STRING,
PLVAR TYPE STRING,
UPDATE_DB TYPE STRING,
READ_ONLY TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/ISDFPS/MCHG_WD_ALV_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_/ISDFPS/MCHG_WD_ALV_STR-MANDT sy-vline 
WA_/ISDFPS/MCHG_WD_ALV_STR-OBJID sy-vline 
WA_/ISDFPS/MCHG_WD_ALV_STR-SHORT sy-vline 
WA_/ISDFPS/MCHG_WD_ALV_STR-STEXT sy-vline 
WA_/ISDFPS/MCHG_WD_ALV_STR-WERKS sy-vline 
WA_/ISDFPS/MCHG_WD_ALV_STR-BERID sy-vline 
WA_/ISDFPS/MCHG_WD_ALV_STR-BERTX sy-vline 
WA_/ISDFPS/MCHG_WD_ALV_STR-LGORT sy-vline 
WA_/ISDFPS/MCHG_WD_ALV_STR-LGOBE sy-vline 
WA_/ISDFPS/MCHG_WD_ALV_STR-LGORT_S sy-vline 
WA_/ISDFPS/MCHG_WD_ALV_STR-SLOC_TYPE sy-vline 
WA_/ISDFPS/MCHG_WD_ALV_STR-REC_LGORT sy-vline 
WA_/ISDFPS/MCHG_WD_ALV_STR-LGORT_HU sy-vline 
WA_/ISDFPS/MCHG_WD_ALV_STR-LGOBE_HU sy-vline 
WA_/ISDFPS/MCHG_WD_ALV_STR-XHUPF sy-vline 
WA_/ISDFPS/MCHG_WD_ALV_STR-PARLG sy-vline 
WA_/ISDFPS/MCHG_WD_ALV_STR-LGNUM sy-vline 
WA_/ISDFPS/MCHG_WD_ALV_STR-SPART sy-vline 
WA_/ISDFPS/MCHG_WD_ALV_STR-VKORG sy-vline 
WA_/ISDFPS/MCHG_WD_ALV_STR-VTWEG sy-vline 
WA_/ISDFPS/MCHG_WD_ALV_STR-VSTEL sy-vline 
WA_/ISDFPS/MCHG_WD_ALV_STR-LIFNR sy-vline 
WA_/ISDFPS/MCHG_WD_ALV_STR-KUNNR sy-vline 
WA_/ISDFPS/MCHG_WD_ALV_STR-EKORG sy-vline 
WA_/ISDFPS/MCHG_WD_ALV_STR-EKOTX sy-vline 
WA_/ISDFPS/MCHG_WD_ALV_STR-EKGRP sy-vline 
WA_/ISDFPS/MCHG_WD_ALV_STR-EKNAM sy-vline 
WA_/ISDFPS/MCHG_WD_ALV_STR-MLOKZ sy-vline 
WA_/ISDFPS/MCHG_WD_ALV_STR-PRIO sy-vline 
WA_/ISDFPS/MCHG_WD_ALV_STR-LOGLEV sy-vline 
WA_/ISDFPS/MCHG_WD_ALV_STR-XLONG sy-vline 
WA_/ISDFPS/MCHG_WD_ALV_STR-XBUFX sy-vline 
WA_/ISDFPS/MCHG_WD_ALV_STR-DISKZ sy-vline 
WA_/ISDFPS/MCHG_WD_ALV_STR-XBLGO sy-vline 
WA_/ISDFPS/MCHG_WD_ALV_STR-XRESS sy-vline 
WA_/ISDFPS/MCHG_WD_ALV_STR-OBJID_MAT sy-vline 
WA_/ISDFPS/MCHG_WD_ALV_STR-OTYPE sy-vline 
WA_/ISDFPS/MCHG_WD_ALV_STR-PLVAR sy-vline 
WA_/ISDFPS/MCHG_WD_ALV_STR-UPDATE_DB sy-vline 
WA_/ISDFPS/MCHG_WD_ALV_STR-READ_ONLY sy-vline      INTO ld_text SEPARATED BY SPACE.

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