ABAP Select data from SAP table QNQMAQMEL0 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP QNQMAQMEL0 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 QNQMAQMEL0. 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 QNQMAQMEL0 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_QNQMAQMEL0 TYPE STANDARD TABLE OF QNQMAQMEL0,
      WA_QNQMAQMEL0 TYPE QNQMAQMEL0,
      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: <QNQMAQMEL0> TYPE QNQMAQMEL0.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_QNQMAQMEL0.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM QNQMAQMEL0
  INTO TABLE IT_QNQMAQMEL0.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM QNQMAQMEL0
*  INTO TABLE @DATA(IT_QNQMAQMEL02).
*--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_QNQMAQMEL0 INDEX 1 INTO DATA(WA_QNQMAQMEL02).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_QNQMAQMEL0 ASSIGNING <QNQMAQMEL0>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<QNQMAQMEL0>-SPART = 1.
<QNQMAQMEL0>-VKORG = 1.
<QNQMAQMEL0>-VTWEG = 1.
<QNQMAQMEL0>-EKORG = 1.
<QNQMAQMEL0>-BKGRP = 1.

ENDLOOP.

LOOP AT IT_QNQMAQMEL0 INTO WA_QNQMAQMEL0.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_QNQMAQMEL0-EBELN, sy-vline,
  WA_QNQMAQMEL0-EBELP, sy-vline,
  WA_QNQMAQMEL0-MJAHR, sy-vline,
  WA_QNQMAQMEL0-MBLNR, sy-vline,
  WA_QNQMAQMEL0-MBLPO, sy-vline,
  WA_QNQMAQMEL0-VKBUR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_QNQMAQMEL0 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_QNQMAQMEL0 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_QNQMAQMEL0 INTO WA_QNQMAQMEL0.


*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_QNQMAQMEL0-EBELN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_QNQMAQMEL0-EBELN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GJAHR, internal->external for field MJAHR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_QNQMAQMEL0-MJAHR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_QNQMAQMEL0-MJAHR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field MBLNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_QNQMAQMEL0-MBLNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_QNQMAQMEL0-MBLNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field PRUEFLOS
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_QNQMAQMEL0-PRUEFLOS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_QNQMAQMEL0-PRUEFLOS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field LS_VBELN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_QNQMAQMEL0-LS_VBELN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_QNQMAQMEL0-LS_VBELN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_QNQMAQMEL0-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_QNQMAQMEL0-MATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field LIFNUM
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_QNQMAQMEL0-LIFNUM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_QNQMAQMEL0-LIFNUM.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KUNUM
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_QNQMAQMEL0-KUNUM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_QNQMAQMEL0-KUNUM.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field BAUTL
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_QNQMAQMEL0-BAUTL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_QNQMAQMEL0-BAUTL.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field FERTAUFNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_QNQMAQMEL0-FERTAUFNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_QNQMAQMEL0-FERTAUFNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field LS_KDAUF
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_QNQMAQMEL0-LS_KDAUF
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_QNQMAQMEL0-LS_KDAUF.
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_QNQMAQMEL0_STR, 
SPART TYPE STRING,
VKORG TYPE STRING,
VTWEG TYPE STRING,
EKORG TYPE STRING,
BKGRP TYPE STRING,
EBELN TYPE STRING,
EBELP TYPE STRING,
MJAHR TYPE STRING,
MBLNR TYPE STRING,
MBLPO TYPE STRING,
VKBUR TYPE STRING,
VKGRP TYPE STRING,
PRUEFLOS TYPE STRING,
LGORTVORG TYPE STRING,
CHARG TYPE STRING,
LGORTCHARG TYPE STRING,
BZMNG TYPE STRING,
RKMNG TYPE STRING,
RGMNG TYPE STRING,
RKDAT TYPE STRING,
LS_VBELN TYPE STRING,
MAWERK TYPE STRING,
MATNR TYPE STRING,
LIFNUM TYPE STRING,
KUNUM TYPE STRING,
BAUTL TYPE STRING,
LS_POSNR TYPE STRING,
FERTAUFNR TYPE STRING,
FERTAUFPL TYPE STRING,
LS_KDAUF TYPE STRING,
LS_KDPOS TYPE STRING,
BSTNK TYPE STRING,
BSTDK TYPE STRING,END OF T_EKKO_STR.
DATA: WA_QNQMAQMEL0_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_QNQMAQMEL0_STR-SPART sy-vline 
WA_QNQMAQMEL0_STR-VKORG sy-vline 
WA_QNQMAQMEL0_STR-VTWEG sy-vline 
WA_QNQMAQMEL0_STR-EKORG sy-vline 
WA_QNQMAQMEL0_STR-BKGRP sy-vline 
WA_QNQMAQMEL0_STR-EBELN sy-vline 
WA_QNQMAQMEL0_STR-EBELP sy-vline 
WA_QNQMAQMEL0_STR-MJAHR sy-vline 
WA_QNQMAQMEL0_STR-MBLNR sy-vline 
WA_QNQMAQMEL0_STR-MBLPO sy-vline 
WA_QNQMAQMEL0_STR-VKBUR sy-vline 
WA_QNQMAQMEL0_STR-VKGRP sy-vline 
WA_QNQMAQMEL0_STR-PRUEFLOS sy-vline 
WA_QNQMAQMEL0_STR-LGORTVORG sy-vline 
WA_QNQMAQMEL0_STR-CHARG sy-vline 
WA_QNQMAQMEL0_STR-LGORTCHARG sy-vline 
WA_QNQMAQMEL0_STR-BZMNG sy-vline 
WA_QNQMAQMEL0_STR-RKMNG sy-vline 
WA_QNQMAQMEL0_STR-RGMNG sy-vline 
WA_QNQMAQMEL0_STR-RKDAT sy-vline 
WA_QNQMAQMEL0_STR-LS_VBELN sy-vline 
WA_QNQMAQMEL0_STR-MAWERK sy-vline 
WA_QNQMAQMEL0_STR-MATNR sy-vline 
WA_QNQMAQMEL0_STR-LIFNUM sy-vline 
WA_QNQMAQMEL0_STR-KUNUM sy-vline 
WA_QNQMAQMEL0_STR-BAUTL sy-vline 
WA_QNQMAQMEL0_STR-LS_POSNR sy-vline 
WA_QNQMAQMEL0_STR-FERTAUFNR sy-vline 
WA_QNQMAQMEL0_STR-FERTAUFPL sy-vline 
WA_QNQMAQMEL0_STR-LS_KDAUF sy-vline 
WA_QNQMAQMEL0_STR-LS_KDPOS sy-vline 
WA_QNQMAQMEL0_STR-BSTNK sy-vline 
WA_QNQMAQMEL0_STR-BSTDK sy-vline      INTO ld_text SEPARATED BY SPACE.

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