ABAP Select data from SAP table MEV_D_WL_ITEM into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MEV_D_WL_ITEM
*  INTO TABLE @DATA(IT_MEV_D_WL_ITEM2).
*--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_MEV_D_WL_ITEM INDEX 1 INTO DATA(WA_MEV_D_WL_ITEM2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MEV_D_WL_ITEM>-MANDT = 1.
<MEV_D_WL_ITEM>-GUID_ITEM = 1.
<MEV_D_WL_ITEM>-OBJ_TYPE = 1.
<MEV_D_WL_ITEM>-OBJ_ID = 1.
<MEV_D_WL_ITEM>-OBJ_ITEM = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MEV_D_WL_ITEM-LIFECYCLE_STATUS, sy-vline,
  WA_MEV_D_WL_ITEM-USER_VERIF_STATUS, sy-vline,
  WA_MEV_D_WL_ITEM-CALC_RESULT_STATUS, sy-vline,
  WA_MEV_D_WL_ITEM-POPER, sy-vline,
  WA_MEV_D_WL_ITEM-GJAHR, sy-vline,
  WA_MEV_D_WL_ITEM-VAL_DATE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MEV_D_WL_ITEM 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_MEV_D_WL_ITEM 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_MEV_D_WL_ITEM INTO WA_MEV_D_WL_ITEM.


*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 GJAHR, internal->external for field GJAHR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_MEV_D_WL_ITEM-GJAHR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MEV_D_WL_ITEM-GJAHR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit TSTMP, internal->external for field CRTSP
CALL FUNCTION 'CONVERSION_EXIT_TSTMP_OUTPUT'
  EXPORTING
    input =                      WA_MEV_D_WL_ITEM-CRTSP
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MEV_D_WL_ITEM-CRTSP.
WRITE:/ 'New Value:', ld_input.

*Conversion exit TSTMP, internal->external for field CHTSP
CALL FUNCTION 'CONVERSION_EXIT_TSTMP_OUTPUT'
  EXPORTING
    input =                      WA_MEV_D_WL_ITEM-CHTSP
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MEV_D_WL_ITEM-CHTSP.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_MEV_D_WL_ITEM-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MEV_D_WL_ITEM-MATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field ORDER_UOM
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_MEV_D_WL_ITEM-ORDER_UOM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MEV_D_WL_ITEM-ORDER_UOM.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit ALPHA, internal->external for field KUNAG
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MEV_D_WL_ITEM-KUNAG
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MEV_D_WL_ITEM-KUNAG.
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_MEV_D_WL_ITEM_STR, 
MANDT TYPE STRING,
GUID_ITEM TYPE STRING,
OBJ_TYPE TYPE STRING,
OBJ_ID TYPE STRING,
OBJ_ITEM TYPE STRING,
LIFECYCLE_STATUS TYPE STRING,
USER_VERIF_STATUS TYPE STRING,
CALC_RESULT_STATUS TYPE STRING,
POPER TYPE STRING,
GJAHR TYPE STRING,
VAL_DATE TYPE STRING,
ERNAM TYPE STRING,
CRTSP TYPE STRING,
AENAM TYPE STRING,
CHTSP TYPE STRING,
CHTSPL TYPE STRING,
TEST_DATA_IND TYPE STRING,
BUKRS TYPE STRING,
MATNR TYPE STRING,
MATKL TYPE STRING,
CHARG TYPE STRING,
WERKS TYPE STRING,
ANTICIP_AMOUNT TYPE STRING,
POSTED_AMOUNT TYPE STRING,
WAERS TYPE STRING,
ANTICIP_QUANTITY TYPE STRING,
POSTED_QUANTITY TYPE STRING,
ORDER_UOM TYPE STRING,
GUID_TEXT TYPE STRING,
NOT_EFFECTIVE TYPE STRING,
HWAER TYPE STRING,
OBJ_ITEM_HL TYPE STRING,
EKORG TYPE STRING,
EKGRP TYPE STRING,
LIFNR TYPE STRING,
VKORG TYPE STRING,
VTWEG TYPE STRING,
SPART TYPE STRING,
VKGRP TYPE STRING,
VKBUR TYPE STRING,
KUNAG TYPE STRING,
PRE_OBJ_TYPE TYPE STRING,
PRE_OBJ_ID TYPE STRING,
PRE_OBJ_ITEM TYPE STRING,
PRE_OBJ_DOC_TYPE TYPE STRING,
PRE_OBJ_DOC_CAT TYPE STRING,
START_OBJ_TYPE TYPE STRING,
START_OBJ_ID TYPE STRING,
START_OBJ_ITEM TYPE STRING,
START_OBJ_DOC_TYPE TYPE STRING,
START_OBJ_DOC_CAT TYPE STRING,
START_OBJ_EXT_ID TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MEV_D_WL_ITEM_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_MEV_D_WL_ITEM_STR-MANDT sy-vline 
WA_MEV_D_WL_ITEM_STR-GUID_ITEM sy-vline 
WA_MEV_D_WL_ITEM_STR-OBJ_TYPE sy-vline 
WA_MEV_D_WL_ITEM_STR-OBJ_ID sy-vline 
WA_MEV_D_WL_ITEM_STR-OBJ_ITEM sy-vline 
WA_MEV_D_WL_ITEM_STR-LIFECYCLE_STATUS sy-vline 
WA_MEV_D_WL_ITEM_STR-USER_VERIF_STATUS sy-vline 
WA_MEV_D_WL_ITEM_STR-CALC_RESULT_STATUS sy-vline 
WA_MEV_D_WL_ITEM_STR-POPER sy-vline 
WA_MEV_D_WL_ITEM_STR-GJAHR sy-vline 
WA_MEV_D_WL_ITEM_STR-VAL_DATE sy-vline 
WA_MEV_D_WL_ITEM_STR-ERNAM sy-vline 
WA_MEV_D_WL_ITEM_STR-CRTSP sy-vline 
WA_MEV_D_WL_ITEM_STR-AENAM sy-vline 
WA_MEV_D_WL_ITEM_STR-CHTSP sy-vline 
WA_MEV_D_WL_ITEM_STR-CHTSPL sy-vline 
WA_MEV_D_WL_ITEM_STR-TEST_DATA_IND sy-vline 
WA_MEV_D_WL_ITEM_STR-BUKRS sy-vline 
WA_MEV_D_WL_ITEM_STR-MATNR sy-vline 
WA_MEV_D_WL_ITEM_STR-MATKL sy-vline 
WA_MEV_D_WL_ITEM_STR-CHARG sy-vline 
WA_MEV_D_WL_ITEM_STR-WERKS sy-vline 
WA_MEV_D_WL_ITEM_STR-ANTICIP_AMOUNT sy-vline 
WA_MEV_D_WL_ITEM_STR-POSTED_AMOUNT sy-vline 
WA_MEV_D_WL_ITEM_STR-WAERS sy-vline 
WA_MEV_D_WL_ITEM_STR-ANTICIP_QUANTITY sy-vline 
WA_MEV_D_WL_ITEM_STR-POSTED_QUANTITY sy-vline 
WA_MEV_D_WL_ITEM_STR-ORDER_UOM sy-vline 
WA_MEV_D_WL_ITEM_STR-GUID_TEXT sy-vline 
WA_MEV_D_WL_ITEM_STR-NOT_EFFECTIVE sy-vline 
WA_MEV_D_WL_ITEM_STR-HWAER sy-vline 
WA_MEV_D_WL_ITEM_STR-OBJ_ITEM_HL sy-vline 
WA_MEV_D_WL_ITEM_STR-EKORG sy-vline 
WA_MEV_D_WL_ITEM_STR-EKGRP sy-vline 
WA_MEV_D_WL_ITEM_STR-LIFNR sy-vline 
WA_MEV_D_WL_ITEM_STR-VKORG sy-vline 
WA_MEV_D_WL_ITEM_STR-VTWEG sy-vline 
WA_MEV_D_WL_ITEM_STR-SPART sy-vline 
WA_MEV_D_WL_ITEM_STR-VKGRP sy-vline 
WA_MEV_D_WL_ITEM_STR-VKBUR sy-vline 
WA_MEV_D_WL_ITEM_STR-KUNAG sy-vline 
WA_MEV_D_WL_ITEM_STR-PRE_OBJ_TYPE sy-vline 
WA_MEV_D_WL_ITEM_STR-PRE_OBJ_ID sy-vline 
WA_MEV_D_WL_ITEM_STR-PRE_OBJ_ITEM sy-vline 
WA_MEV_D_WL_ITEM_STR-PRE_OBJ_DOC_TYPE sy-vline 
WA_MEV_D_WL_ITEM_STR-PRE_OBJ_DOC_CAT sy-vline 
WA_MEV_D_WL_ITEM_STR-START_OBJ_TYPE sy-vline 
WA_MEV_D_WL_ITEM_STR-START_OBJ_ID sy-vline 
WA_MEV_D_WL_ITEM_STR-START_OBJ_ITEM sy-vline 
WA_MEV_D_WL_ITEM_STR-START_OBJ_DOC_TYPE sy-vline 
WA_MEV_D_WL_ITEM_STR-START_OBJ_DOC_CAT sy-vline 
WA_MEV_D_WL_ITEM_STR-START_OBJ_EXT_ID sy-vline      INTO ld_text SEPARATED BY SPACE.

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