ABAP Select data from SAP table M_MEINN into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM M_MEINN
*  INTO TABLE @DATA(IT_M_MEINN2).
*--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_M_MEINN INDEX 1 INTO DATA(WA_M_MEINN2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<M_MEINN>-MANDT = 1.
<M_MEINN>-MATKL = 1.
<M_MEINN>-SORTL = 1.
<M_MEINN>-TXZ01 = 1.
<M_MEINN>-LIFNR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_M_MEINN-INFNR, sy-vline,
  WA_M_MEINN-ESOKZ, sy-vline,
  WA_M_MEINN-EKORG, sy-vline,
  WA_M_MEINN-WERKS, sy-vline,
  WA_M_MEINN-ISEOPBLOCKED, sy-vline,
ENDLOOP.
   
*Add any further fields from structure WA_M_MEINN 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_M_MEINN 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_M_MEINN INTO WA_M_MEINN.


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

*Conversion exit ALPHA, internal->external for field INFNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_M_MEINN-INFNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_M_MEINN-INFNR.
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_M_MEINN_STR, 
MANDT TYPE STRING,
MATKL TYPE STRING,
SORTL TYPE STRING,
TXZ01 TYPE STRING,
LIFNR TYPE STRING,
INFNR TYPE STRING,
ESOKZ TYPE STRING,
EKORG TYPE STRING,
WERKS TYPE STRING,
ISEOPBLOCKED TYPE STRING,END OF T_EKKO_STR.
DATA: WA_M_MEINN_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_M_MEINN_STR-MANDT sy-vline 
WA_M_MEINN_STR-MATKL sy-vline 
WA_M_MEINN_STR-SORTL sy-vline 
WA_M_MEINN_STR-TXZ01 sy-vline 
WA_M_MEINN_STR-LIFNR sy-vline 
WA_M_MEINN_STR-INFNR sy-vline 
WA_M_MEINN_STR-ESOKZ sy-vline 
WA_M_MEINN_STR-EKORG sy-vline 
WA_M_MEINN_STR-WERKS sy-vline 
WA_M_MEINN_STR-ISEOPBLOCKED sy-vline      INTO ld_text SEPARATED BY SPACE.

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