ABAP Select data from SAP table MMIV_PO_STY into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MMIV_PO_STY
*  INTO TABLE @DATA(IT_MMIV_PO_STY2).
*--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_MMIV_PO_STY INDEX 1 INTO DATA(WA_MMIV_PO_STY2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MMIV_PO_STY>-EBELN = 1.
<MMIV_PO_STY>-EBELP = 1.
<MMIV_PO_STY>-EKORG = 1.
<MMIV_PO_STY>-EKGRP = 1.
<MMIV_PO_STY>-BUKRS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MMIV_PO_STY-LIFNR, sy-vline,
  WA_MMIV_PO_STY-LIFRE, sy-vline,
  WA_MMIV_PO_STY-PSTYP, sy-vline,
  WA_MMIV_PO_STY-MATNR, sy-vline,
  WA_MMIV_PO_STY-TXZ01, sy-vline,
  WA_MMIV_PO_STY-KNTTP, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MMIV_PO_STY 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_MMIV_PO_STY 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_MMIV_PO_STY INTO WA_MMIV_PO_STY.


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

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

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

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

*Conversion exit CUNIT, internal->external for field MEINS
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_MMIV_PO_STY-MEINS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MMIV_PO_STY-MEINS.
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_MMIV_PO_STY_STR, 
EBELN TYPE STRING,
EBELP TYPE STRING,
EKORG TYPE STRING,
EKGRP TYPE STRING,
BUKRS TYPE STRING,
LIFNR TYPE STRING,
LIFRE TYPE STRING,
PSTYP TYPE STRING,
MATNR TYPE STRING,
TXZ01 TYPE STRING,
KNTTP TYPE STRING,
MENGE TYPE STRING,
MEINS TYPE STRING,
WERKS TYPE STRING,
WEMNG TYPE STRING,
REMNG TYPE STRING,
NETWR TYPE STRING,
NETPR TYPE STRING,
RETPO TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MMIV_PO_STY_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_MMIV_PO_STY_STR-EBELN sy-vline 
WA_MMIV_PO_STY_STR-EBELP sy-vline 
WA_MMIV_PO_STY_STR-EKORG sy-vline 
WA_MMIV_PO_STY_STR-EKGRP sy-vline 
WA_MMIV_PO_STY_STR-BUKRS sy-vline 
WA_MMIV_PO_STY_STR-LIFNR sy-vline 
WA_MMIV_PO_STY_STR-LIFRE sy-vline 
WA_MMIV_PO_STY_STR-PSTYP sy-vline 
WA_MMIV_PO_STY_STR-MATNR sy-vline 
WA_MMIV_PO_STY_STR-TXZ01 sy-vline 
WA_MMIV_PO_STY_STR-KNTTP sy-vline 
WA_MMIV_PO_STY_STR-MENGE sy-vline 
WA_MMIV_PO_STY_STR-MEINS sy-vline 
WA_MMIV_PO_STY_STR-WERKS sy-vline 
WA_MMIV_PO_STY_STR-WEMNG sy-vline 
WA_MMIV_PO_STY_STR-REMNG sy-vline 
WA_MMIV_PO_STY_STR-NETWR sy-vline 
WA_MMIV_PO_STY_STR-NETPR sy-vline 
WA_MMIV_PO_STY_STR-RETPO sy-vline      INTO ld_text SEPARATED BY SPACE.

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