ABAP Select data from SAP table MEPRO into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MEPRO
*  INTO TABLE @DATA(IT_MEPRO2).
*--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_MEPRO INDEX 1 INTO DATA(WA_MEPRO2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MEPRO>-PREIS = 1.
<MEPRO>-PEINH = 1.
<MEPRO>-BPRME = 1.
<MEPRO>-WAERS = 1.
<MEPRO>-BWSVW = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MEPRO-KZSTA, sy-vline,
  WA_MEPRO-MENGE, sy-vline,
  WA_MEPRO-MEINS, sy-vline,
  WA_MEPRO-BMENG, sy-vline,
  WA_MEPRO-BSTME, sy-vline,
  WA_MEPRO-NETWR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MEPRO 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_MEPRO 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_MEPRO INTO WA_MEPRO.


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

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

*Conversion exit CUNIT, internal->external for field BSTME
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_MEPRO-BSTME
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MEPRO-BSTME.
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_MEPRO_STR, 
PREIS TYPE STRING,
PEINH TYPE STRING,
BPRME TYPE STRING,
WAERS TYPE STRING,
BWSVW TYPE STRING,
KZSTA TYPE STRING,
MENGE TYPE STRING,
MEINS TYPE STRING,
BMENG TYPE STRING,
BSTME TYPE STRING,
NETWR TYPE STRING,
GRWRT TYPE STRING,
NAVNW TYPE STRING,
MWSKZ TYPE STRING,
TXJCD TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MEPRO_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_MEPRO_STR-PREIS sy-vline 
WA_MEPRO_STR-PEINH sy-vline 
WA_MEPRO_STR-BPRME sy-vline 
WA_MEPRO_STR-WAERS sy-vline 
WA_MEPRO_STR-BWSVW sy-vline 
WA_MEPRO_STR-KZSTA sy-vline 
WA_MEPRO_STR-MENGE sy-vline 
WA_MEPRO_STR-MEINS sy-vline 
WA_MEPRO_STR-BMENG sy-vline 
WA_MEPRO_STR-BSTME sy-vline 
WA_MEPRO_STR-NETWR sy-vline 
WA_MEPRO_STR-GRWRT sy-vline 
WA_MEPRO_STR-NAVNW sy-vline 
WA_MEPRO_STR-MWSKZ sy-vline 
WA_MEPRO_STR-TXJCD sy-vline      INTO ld_text SEPARATED BY SPACE.

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