ABAP Select data from SAP table MEV_S_WL_SEL_CRIT 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_SEL_CRIT 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_SEL_CRIT. 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_SEL_CRIT 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_SEL_CRIT TYPE STANDARD TABLE OF MEV_S_WL_SEL_CRIT,
      WA_MEV_S_WL_SEL_CRIT TYPE MEV_S_WL_SEL_CRIT,
      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_SEL_CRIT> TYPE MEV_S_WL_SEL_CRIT.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MEV_S_WL_SEL_CRIT
*  INTO TABLE @DATA(IT_MEV_S_WL_SEL_CRIT2).
*--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_SEL_CRIT INDEX 1 INTO DATA(WA_MEV_S_WL_SEL_CRIT2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MEV_S_WL_SEL_CRIT>-SSCR_BLOCK = 1.
<MEV_S_WL_SEL_CRIT>-BUKRS = 1.
<MEV_S_WL_SEL_CRIT>-MATNR = 1.
<MEV_S_WL_SEL_CRIT>-MATKL = 1.
<MEV_S_WL_SEL_CRIT>-EKORG = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MEV_S_WL_SEL_CRIT-EKGRP, sy-vline,
  WA_MEV_S_WL_SEL_CRIT-LIFNR, sy-vline,
  WA_MEV_S_WL_SEL_CRIT-VKORG, sy-vline,
  WA_MEV_S_WL_SEL_CRIT-VTWEG, sy-vline,
  WA_MEV_S_WL_SEL_CRIT-SPART, sy-vline,
  WA_MEV_S_WL_SEL_CRIT-KUNAG, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MEV_S_WL_SEL_CRIT 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_SEL_CRIT 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_SEL_CRIT INTO WA_MEV_S_WL_SEL_CRIT.


*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_MEV_S_WL_SEL_CRIT_STR, 
SSCR_BLOCK TYPE STRING,
BUKRS TYPE STRING,
MATNR TYPE STRING,
MATKL TYPE STRING,
EKORG TYPE STRING,
EKGRP TYPE STRING,
LIFNR TYPE STRING,
VKORG TYPE STRING,
VTWEG TYPE STRING,
SPART TYPE STRING,
KUNAG 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_EXT_ID TYPE STRING,
POPER TYPE STRING,
GJAHR TYPE STRING,
LIFECYCLE_STATUS TYPE STRING,
USER_VERIF_STATUS TYPE STRING,
VAL_DATE TYPE STRING,
CALC_RESULT_STATUS TYPE STRING,
TEST_DATA_IND TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MEV_S_WL_SEL_CRIT_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_SEL_CRIT_STR-SSCR_BLOCK sy-vline 
WA_MEV_S_WL_SEL_CRIT_STR-BUKRS sy-vline 
WA_MEV_S_WL_SEL_CRIT_STR-MATNR sy-vline 
WA_MEV_S_WL_SEL_CRIT_STR-MATKL sy-vline 
WA_MEV_S_WL_SEL_CRIT_STR-EKORG sy-vline 
WA_MEV_S_WL_SEL_CRIT_STR-EKGRP sy-vline 
WA_MEV_S_WL_SEL_CRIT_STR-LIFNR sy-vline 
WA_MEV_S_WL_SEL_CRIT_STR-VKORG sy-vline 
WA_MEV_S_WL_SEL_CRIT_STR-VTWEG sy-vline 
WA_MEV_S_WL_SEL_CRIT_STR-SPART sy-vline 
WA_MEV_S_WL_SEL_CRIT_STR-KUNAG sy-vline 
WA_MEV_S_WL_SEL_CRIT_STR-START_OBJ_TYPE sy-vline 
WA_MEV_S_WL_SEL_CRIT_STR-START_OBJ_ID sy-vline 
WA_MEV_S_WL_SEL_CRIT_STR-START_OBJ_ITEM sy-vline 
WA_MEV_S_WL_SEL_CRIT_STR-START_OBJ_DOC_TYPE sy-vline 
WA_MEV_S_WL_SEL_CRIT_STR-START_OBJ_EXT_ID sy-vline 
WA_MEV_S_WL_SEL_CRIT_STR-POPER sy-vline 
WA_MEV_S_WL_SEL_CRIT_STR-GJAHR sy-vline 
WA_MEV_S_WL_SEL_CRIT_STR-LIFECYCLE_STATUS sy-vline 
WA_MEV_S_WL_SEL_CRIT_STR-USER_VERIF_STATUS sy-vline 
WA_MEV_S_WL_SEL_CRIT_STR-VAL_DATE sy-vline 
WA_MEV_S_WL_SEL_CRIT_STR-CALC_RESULT_STATUS sy-vline 
WA_MEV_S_WL_SEL_CRIT_STR-TEST_DATA_IND sy-vline      INTO ld_text SEPARATED BY SPACE.

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