ABAP Select data from SAP table MEV_S_WL_WORK_BASE into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP MEV_S_WL_WORK_BASE 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_S_WL_WORK_BASE. 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_S_WL_WORK_BASE 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_S_WL_WORK_BASE TYPE STANDARD TABLE OF MEV_S_WL_WORK_BASE,
      WA_MEV_S_WL_WORK_BASE TYPE MEV_S_WL_WORK_BASE,
      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_S_WL_WORK_BASE> TYPE MEV_S_WL_WORK_BASE.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MEV_S_WL_WORK_BASE
*  INTO TABLE @DATA(IT_MEV_S_WL_WORK_BASE2).
*--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_S_WL_WORK_BASE INDEX 1 INTO DATA(WA_MEV_S_WL_WORK_BASE2).


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

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

ENDLOOP.

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

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


*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_S_WL_WORK_BASE-GJAHR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MEV_S_WL_WORK_BASE-GJAHR.
WRITE:/ 'New Value:', ld_input.

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

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

*Conversion exit MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_MEV_S_WL_WORK_BASE-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MEV_S_WL_WORK_BASE-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_S_WL_WORK_BASE-ORDER_UOM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MEV_S_WL_WORK_BASE-ORDER_UOM.
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_S_WL_WORK_BASE_STR, 
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,
SHORT_TEXT TYPE STRING,
ACCRUAL_AMOUNT TYPE STRING,
DELETE_ITEM TYPE STRING,
ORDER_CREATED_BY TYPE STRING,
ORDER_CREATION_DATE 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_S_WL_WORK_BASE_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_S_WL_WORK_BASE_STR-GUID_ITEM sy-vline 
WA_MEV_S_WL_WORK_BASE_STR-OBJ_TYPE sy-vline 
WA_MEV_S_WL_WORK_BASE_STR-OBJ_ID sy-vline 
WA_MEV_S_WL_WORK_BASE_STR-OBJ_ITEM sy-vline 
WA_MEV_S_WL_WORK_BASE_STR-LIFECYCLE_STATUS sy-vline 
WA_MEV_S_WL_WORK_BASE_STR-USER_VERIF_STATUS sy-vline 
WA_MEV_S_WL_WORK_BASE_STR-CALC_RESULT_STATUS sy-vline 
WA_MEV_S_WL_WORK_BASE_STR-POPER sy-vline 
WA_MEV_S_WL_WORK_BASE_STR-GJAHR sy-vline 
WA_MEV_S_WL_WORK_BASE_STR-VAL_DATE sy-vline 
WA_MEV_S_WL_WORK_BASE_STR-ERNAM sy-vline 
WA_MEV_S_WL_WORK_BASE_STR-CRTSP sy-vline 
WA_MEV_S_WL_WORK_BASE_STR-AENAM sy-vline 
WA_MEV_S_WL_WORK_BASE_STR-CHTSP sy-vline 
WA_MEV_S_WL_WORK_BASE_STR-CHTSPL sy-vline 
WA_MEV_S_WL_WORK_BASE_STR-TEST_DATA_IND sy-vline 
WA_MEV_S_WL_WORK_BASE_STR-BUKRS sy-vline 
WA_MEV_S_WL_WORK_BASE_STR-MATNR sy-vline 
WA_MEV_S_WL_WORK_BASE_STR-MATKL sy-vline 
WA_MEV_S_WL_WORK_BASE_STR-CHARG sy-vline 
WA_MEV_S_WL_WORK_BASE_STR-WERKS sy-vline 
WA_MEV_S_WL_WORK_BASE_STR-ANTICIP_AMOUNT sy-vline 
WA_MEV_S_WL_WORK_BASE_STR-POSTED_AMOUNT sy-vline 
WA_MEV_S_WL_WORK_BASE_STR-WAERS sy-vline 
WA_MEV_S_WL_WORK_BASE_STR-ANTICIP_QUANTITY sy-vline 
WA_MEV_S_WL_WORK_BASE_STR-POSTED_QUANTITY sy-vline 
WA_MEV_S_WL_WORK_BASE_STR-ORDER_UOM sy-vline 
WA_MEV_S_WL_WORK_BASE_STR-GUID_TEXT sy-vline 
WA_MEV_S_WL_WORK_BASE_STR-NOT_EFFECTIVE sy-vline 
WA_MEV_S_WL_WORK_BASE_STR-HWAER sy-vline 
WA_MEV_S_WL_WORK_BASE_STR-OBJ_ITEM_HL sy-vline 
WA_MEV_S_WL_WORK_BASE_STR-SHORT_TEXT sy-vline 
WA_MEV_S_WL_WORK_BASE_STR-ACCRUAL_AMOUNT sy-vline 
WA_MEV_S_WL_WORK_BASE_STR-DELETE_ITEM sy-vline 
WA_MEV_S_WL_WORK_BASE_STR-ORDER_CREATED_BY sy-vline 
WA_MEV_S_WL_WORK_BASE_STR-ORDER_CREATION_DATE sy-vline 
WA_MEV_S_WL_WORK_BASE_STR-PRE_OBJ_TYPE sy-vline 
WA_MEV_S_WL_WORK_BASE_STR-PRE_OBJ_ID sy-vline 
WA_MEV_S_WL_WORK_BASE_STR-PRE_OBJ_ITEM sy-vline 
WA_MEV_S_WL_WORK_BASE_STR-PRE_OBJ_DOC_TYPE sy-vline 
WA_MEV_S_WL_WORK_BASE_STR-PRE_OBJ_DOC_CAT sy-vline 
WA_MEV_S_WL_WORK_BASE_STR-START_OBJ_TYPE sy-vline 
WA_MEV_S_WL_WORK_BASE_STR-START_OBJ_ID sy-vline 
WA_MEV_S_WL_WORK_BASE_STR-START_OBJ_ITEM sy-vline 
WA_MEV_S_WL_WORK_BASE_STR-START_OBJ_DOC_TYPE sy-vline 
WA_MEV_S_WL_WORK_BASE_STR-START_OBJ_DOC_CAT sy-vline 
WA_MEV_S_WL_WORK_BASE_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.