ABAP Select data from SAP table MCH_MPOS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MCH_MPOS
*  INTO TABLE @DATA(IT_MCH_MPOS2).
*--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_MCH_MPOS INDEX 1 INTO DATA(WA_MCH_MPOS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MCH_MPOS>-MANDT = 1.
<MCH_MPOS>-WAPOS = 1.
<MCH_MPOS>-WARPL = 1.
<MCH_MPOS>-PSTXT = 1.
<MCH_MPOS>-EQUNR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MCH_MPOS-PLNTY, sy-vline,
  WA_MCH_MPOS-PLNNR, sy-vline,
  WA_MCH_MPOS-PLNAL, sy-vline,
  WA_MCH_MPOS-WPGRP, sy-vline,
  WA_MCH_MPOS-IWERK, sy-vline,
  WA_MCH_MPOS-BAUTL, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MCH_MPOS 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_MCH_MPOS 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_MCH_MPOS INTO WA_MCH_MPOS.


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

*Conversion exit ALPHA, internal->external for field WARPL
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MCH_MPOS-WARPL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCH_MPOS-WARPL.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field EQUNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MCH_MPOS-EQUNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCH_MPOS-EQUNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field PLNNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MCH_MPOS-PLNNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCH_MPOS-PLNNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field PLNAL
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MCH_MPOS-PLNAL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCH_MPOS-PLNAL.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field BAUTL
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_MCH_MPOS-BAUTL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCH_MPOS-BAUTL.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ABPSP, internal->external for field PSPEL
CALL FUNCTION 'CONVERSION_EXIT_ABPSP_OUTPUT'
  EXPORTING
    input =                      WA_MCH_MPOS-PSPEL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCH_MPOS-PSPEL.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KDAUF
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MCH_MPOS-KDAUF
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCH_MPOS-KDAUF.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field BSTNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MCH_MPOS-BSTNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCH_MPOS-BSTNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GERNR, internal->external for field SERIALNR
CALL FUNCTION 'CONVERSION_EXIT_GERNR_OUTPUT'
  EXPORTING
    input =                      WA_MCH_MPOS-SERIALNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCH_MPOS-SERIALNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field SERMAT
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_MCH_MPOS-SERMAT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCH_MPOS-SERMAT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit TPLNR, internal->external for field TPLNR
CALL FUNCTION 'CONVERSION_EXIT_TPLNR_OUTPUT'
  EXPORTING
    input =                      WA_MCH_MPOS-TPLNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCH_MPOS-TPLNR.
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_MCH_MPOS_STR, 
MANDT TYPE STRING,
WAPOS TYPE STRING,
WARPL TYPE STRING,
PSTXT TYPE STRING,
EQUNR TYPE STRING,
PLNTY TYPE STRING,
PLNNR TYPE STRING,
PLNAL TYPE STRING,
WPGRP TYPE STRING,
IWERK TYPE STRING,
BAUTL TYPE STRING,
ANLZU TYPE STRING,
AUART TYPE STRING,
ILART TYPE STRING,
GSBER TYPE STRING,
PRIOK TYPE STRING,
PSPEL TYPE STRING,
KDAUF TYPE STRING,
KDPOS TYPE STRING,
BSTNR TYPE STRING,
BSTPO TYPE STRING,
SERIALNR TYPE STRING,
SERMAT TYPE STRING,
DEVICEID TYPE STRING,
TPLNR TYPE STRING,
ARBPL TYPE STRING,
WERKS TYPE STRING,
QMART TYPE STRING,
APFKT TYPE STRING,
CYCLESEQIND TYPE STRING,
TASK_DETERMINE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MCH_MPOS_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_MCH_MPOS_STR-MANDT sy-vline 
WA_MCH_MPOS_STR-WAPOS sy-vline 
WA_MCH_MPOS_STR-WARPL sy-vline 
WA_MCH_MPOS_STR-PSTXT sy-vline 
WA_MCH_MPOS_STR-EQUNR sy-vline 
WA_MCH_MPOS_STR-PLNTY sy-vline 
WA_MCH_MPOS_STR-PLNNR sy-vline 
WA_MCH_MPOS_STR-PLNAL sy-vline 
WA_MCH_MPOS_STR-WPGRP sy-vline 
WA_MCH_MPOS_STR-IWERK sy-vline 
WA_MCH_MPOS_STR-BAUTL sy-vline 
WA_MCH_MPOS_STR-ANLZU sy-vline 
WA_MCH_MPOS_STR-AUART sy-vline 
WA_MCH_MPOS_STR-ILART sy-vline 
WA_MCH_MPOS_STR-GSBER sy-vline 
WA_MCH_MPOS_STR-PRIOK sy-vline 
WA_MCH_MPOS_STR-PSPEL sy-vline 
WA_MCH_MPOS_STR-KDAUF sy-vline 
WA_MCH_MPOS_STR-KDPOS sy-vline 
WA_MCH_MPOS_STR-BSTNR sy-vline 
WA_MCH_MPOS_STR-BSTPO sy-vline 
WA_MCH_MPOS_STR-SERIALNR sy-vline 
WA_MCH_MPOS_STR-SERMAT sy-vline 
WA_MCH_MPOS_STR-DEVICEID sy-vline 
WA_MCH_MPOS_STR-TPLNR sy-vline 
WA_MCH_MPOS_STR-ARBPL sy-vline 
WA_MCH_MPOS_STR-WERKS sy-vline 
WA_MCH_MPOS_STR-QMART sy-vline 
WA_MCH_MPOS_STR-APFKT sy-vline 
WA_MCH_MPOS_STR-CYCLESEQIND sy-vline 
WA_MCH_MPOS_STR-TASK_DETERMINE sy-vline      INTO ld_text SEPARATED BY SPACE.

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