ABAP Select data from SAP table MPO_AC_LIST_GENERAL into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MPO_AC_LIST_GENERAL
*  INTO TABLE @DATA(IT_MPO_AC_LIST_GENERAL2).
*--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_MPO_AC_LIST_GENERAL INDEX 1 INTO DATA(WA_MPO_AC_LIST_GENERAL2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MPO_AC_LIST_GENERAL>-TXA50 = 1.
<MPO_AC_LIST_GENERAL>-ANLKL = 1.
<MPO_AC_LIST_GENERAL>-TXK20 = 1.
<MPO_AC_LIST_GENERAL>-MENGE = 1.
<MPO_AC_LIST_GENERAL>-MEINS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MPO_AC_LIST_GENERAL-TYPBZ, sy-vline,
  WA_MPO_AC_LIST_GENERAL-INKEN, sy-vline,
  WA_MPO_AC_LIST_GENERAL-IVDAT, sy-vline,
  WA_MPO_AC_LIST_GENERAL-INVZU, sy-vline,
  WA_MPO_AC_LIST_GENERAL-INVNR, sy-vline,
  WA_MPO_AC_LIST_GENERAL-ZUJHR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MPO_AC_LIST_GENERAL 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_MPO_AC_LIST_GENERAL 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_MPO_AC_LIST_GENERAL INTO WA_MPO_AC_LIST_GENERAL.


*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 ANLKL
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MPO_AC_LIST_GENERAL-ANLKL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MPO_AC_LIST_GENERAL-ANLKL.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit GJAHR, internal->external for field ZUJHR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_MPO_AC_LIST_GENERAL-ZUJHR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MPO_AC_LIST_GENERAL-ZUJHR.
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_MPO_AC_LIST_GENERAL_STR, 
TXA50 TYPE STRING,
ANLKL TYPE STRING,
TXK20 TYPE STRING,
MENGE TYPE STRING,
MEINS TYPE STRING,
TYPBZ TYPE STRING,
INKEN TYPE STRING,
IVDAT TYPE STRING,
INVZU TYPE STRING,
INVNR TYPE STRING,
ZUJHR TYPE STRING,
ZUPER TYPE STRING,
ZUGDT TYPE STRING,
AKTIV TYPE STRING,
DEAKT TYPE STRING,
GPLAB TYPE STRING,
BSTDT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MPO_AC_LIST_GENERAL_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_MPO_AC_LIST_GENERAL_STR-TXA50 sy-vline 
WA_MPO_AC_LIST_GENERAL_STR-ANLKL sy-vline 
WA_MPO_AC_LIST_GENERAL_STR-TXK20 sy-vline 
WA_MPO_AC_LIST_GENERAL_STR-MENGE sy-vline 
WA_MPO_AC_LIST_GENERAL_STR-MEINS sy-vline 
WA_MPO_AC_LIST_GENERAL_STR-TYPBZ sy-vline 
WA_MPO_AC_LIST_GENERAL_STR-INKEN sy-vline 
WA_MPO_AC_LIST_GENERAL_STR-IVDAT sy-vline 
WA_MPO_AC_LIST_GENERAL_STR-INVZU sy-vline 
WA_MPO_AC_LIST_GENERAL_STR-INVNR sy-vline 
WA_MPO_AC_LIST_GENERAL_STR-ZUJHR sy-vline 
WA_MPO_AC_LIST_GENERAL_STR-ZUPER sy-vline 
WA_MPO_AC_LIST_GENERAL_STR-ZUGDT sy-vline 
WA_MPO_AC_LIST_GENERAL_STR-AKTIV sy-vline 
WA_MPO_AC_LIST_GENERAL_STR-DEAKT sy-vline 
WA_MPO_AC_LIST_GENERAL_STR-GPLAB sy-vline 
WA_MPO_AC_LIST_GENERAL_STR-BSTDT sy-vline      INTO ld_text SEPARATED BY SPACE.

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