ABAP Select data from SAP table MEPO1331 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP MEPO1331 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 MEPO1331. 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 MEPO1331 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_MEPO1331 TYPE STANDARD TABLE OF MEPO1331,
      WA_MEPO1331 TYPE MEPO1331,
      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: <MEPO1331> TYPE MEPO1331.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_MEPO1331.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM MEPO1331
  INTO TABLE IT_MEPO1331.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MEPO1331
*  INTO TABLE @DATA(IT_MEPO13312).
*--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_MEPO1331 INDEX 1 INTO DATA(WA_MEPO13312).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_MEPO1331 ASSIGNING <MEPO1331>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MEPO1331>-LFART = 1.
<MEPO1331>-VSTEL = 1.
<MEPO1331>-LPRIO = 1.
<MEPO1331>-ROUTE = 1.
<MEPO1331>-KUNNR = 1.

ENDLOOP.

LOOP AT IT_MEPO1331 INTO WA_MEPO1331.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MEPO1331-VKORG, sy-vline,
  WA_MEPO1331-VTWEG, sy-vline,
  WA_MEPO1331-SPART, sy-vline,
  WA_MEPO1331-LEDAT, sy-vline,
  WA_MEPO1331-VSBED, sy-vline,
  WA_MEPO1331-LADGR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MEPO1331 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_MEPO1331 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_MEPO1331 INTO WA_MEPO1331.


*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 KUNNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MEPO1331-KUNNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MEPO1331-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_MEPO1331_STR, 
LFART TYPE STRING,
VSTEL TYPE STRING,
LPRIO TYPE STRING,
ROUTE TYPE STRING,
KUNNR TYPE STRING,
VKORG TYPE STRING,
VTWEG TYPE STRING,
SPART TYPE STRING,
LEDAT TYPE STRING,
VSBED TYPE STRING,
LADGR TYPE STRING,
TRAGR TYPE STRING,
ABLAD TYPE STRING,
KZAZU TYPE STRING,
LFART_TEXT TYPE STRING,
VSTEL_TEXT TYPE STRING,
LPRIO_TEXT TYPE STRING,
VSBED_TEXT TYPE STRING,
LADGR_TEXT TYPE STRING,
TRAGR_TEXT TYPE STRING,
ROUTE_TEXT TYPE STRING,
NAME1 TYPE STRING,
EINDT TYPE STRING,
PLIFZ TYPE STRING,
VKORG_TEXT TYPE STRING,
VTWEG_TEXT TYPE STRING,
SPART_TEXT TYPE STRING,
ORT01 TYPE STRING,
VSART TYPE STRING,
VSART_TEXT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MEPO1331_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_MEPO1331_STR-LFART sy-vline 
WA_MEPO1331_STR-VSTEL sy-vline 
WA_MEPO1331_STR-LPRIO sy-vline 
WA_MEPO1331_STR-ROUTE sy-vline 
WA_MEPO1331_STR-KUNNR sy-vline 
WA_MEPO1331_STR-VKORG sy-vline 
WA_MEPO1331_STR-VTWEG sy-vline 
WA_MEPO1331_STR-SPART sy-vline 
WA_MEPO1331_STR-LEDAT sy-vline 
WA_MEPO1331_STR-VSBED sy-vline 
WA_MEPO1331_STR-LADGR sy-vline 
WA_MEPO1331_STR-TRAGR sy-vline 
WA_MEPO1331_STR-ABLAD sy-vline 
WA_MEPO1331_STR-KZAZU sy-vline 
WA_MEPO1331_STR-LFART_TEXT sy-vline 
WA_MEPO1331_STR-VSTEL_TEXT sy-vline 
WA_MEPO1331_STR-LPRIO_TEXT sy-vline 
WA_MEPO1331_STR-VSBED_TEXT sy-vline 
WA_MEPO1331_STR-LADGR_TEXT sy-vline 
WA_MEPO1331_STR-TRAGR_TEXT sy-vline 
WA_MEPO1331_STR-ROUTE_TEXT sy-vline 
WA_MEPO1331_STR-NAME1 sy-vline 
WA_MEPO1331_STR-EINDT sy-vline 
WA_MEPO1331_STR-PLIFZ sy-vline 
WA_MEPO1331_STR-VKORG_TEXT sy-vline 
WA_MEPO1331_STR-VTWEG_TEXT sy-vline 
WA_MEPO1331_STR-SPART_TEXT sy-vline 
WA_MEPO1331_STR-ORT01 sy-vline 
WA_MEPO1331_STR-VSART sy-vline 
WA_MEPO1331_STR-VSART_TEXT sy-vline      INTO ld_text SEPARATED BY SPACE.

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