ABAP Select data from SAP table MRM_QACK into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MRM_QACK
*  INTO TABLE @DATA(IT_MRM_QACK2).
*--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_MRM_QACK INDEX 1 INTO DATA(WA_MRM_QACK2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MRM_QACK>-BASME = 1.
<MRM_QACK>-BPUMN = 1.
<MRM_QACK>-BPUMZ = 1.
<MRM_QACK>-BSMNG = 1.
<MRM_QACK>-BUDAT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MRM_QACK-BUKRS, sy-vline,
  WA_MRM_QACK-LFBNR, sy-vline,
  WA_MRM_QACK-MENGE, sy-vline,
  WA_MRM_QACK-NETWR, sy-vline,
  WA_MRM_QACK-NOQUANTITY, sy-vline,
  WA_MRM_QACK-PSTYP, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MRM_QACK 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_MRM_QACK 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_MRM_QACK INTO WA_MRM_QACK.


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

*Conversion exit ALPHA, internal->external for field LFBNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MRM_QACK-LFBNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MRM_QACK-LFBNR.
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_MRM_QACK_STR, 
BASME TYPE STRING,
BPUMN TYPE STRING,
BPUMZ TYPE STRING,
BSMNG TYPE STRING,
BUDAT TYPE STRING,
BUKRS TYPE STRING,
LFBNR TYPE STRING,
MENGE TYPE STRING,
NETWR TYPE STRING,
NOQUANTITY TYPE STRING,
PSTYP TYPE STRING,
REMNG TYPE STRING,
RETPO TYPE STRING,
SHKZG TYPE STRING,
TBTKZ TYPE STRING,
WAERS TYPE STRING,
WEBRE TYPE STRING,
WEMNG TYPE STRING,
WEPOS TYPE STRING,
WWERT TYPE STRING,
XEKBZ TYPE STRING,
XRECH TYPE STRING,
XZUORDLI TYPE STRING,
XZUORDRT TYPE STRING,
IVTYP TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MRM_QACK_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_MRM_QACK_STR-BASME sy-vline 
WA_MRM_QACK_STR-BPUMN sy-vline 
WA_MRM_QACK_STR-BPUMZ sy-vline 
WA_MRM_QACK_STR-BSMNG sy-vline 
WA_MRM_QACK_STR-BUDAT sy-vline 
WA_MRM_QACK_STR-BUKRS sy-vline 
WA_MRM_QACK_STR-LFBNR sy-vline 
WA_MRM_QACK_STR-MENGE sy-vline 
WA_MRM_QACK_STR-NETWR sy-vline 
WA_MRM_QACK_STR-NOQUANTITY sy-vline 
WA_MRM_QACK_STR-PSTYP sy-vline 
WA_MRM_QACK_STR-REMNG sy-vline 
WA_MRM_QACK_STR-RETPO sy-vline 
WA_MRM_QACK_STR-SHKZG sy-vline 
WA_MRM_QACK_STR-TBTKZ sy-vline 
WA_MRM_QACK_STR-WAERS sy-vline 
WA_MRM_QACK_STR-WEBRE sy-vline 
WA_MRM_QACK_STR-WEMNG sy-vline 
WA_MRM_QACK_STR-WEPOS sy-vline 
WA_MRM_QACK_STR-WWERT sy-vline 
WA_MRM_QACK_STR-XEKBZ sy-vline 
WA_MRM_QACK_STR-XRECH sy-vline 
WA_MRM_QACK_STR-XZUORDLI sy-vline 
WA_MRM_QACK_STR-XZUORDRT sy-vline 
WA_MRM_QACK_STR-IVTYP sy-vline      INTO ld_text SEPARATED BY SPACE.

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