ABAP Select data from SAP table QMKST into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM QMKST
*  INTO TABLE @DATA(IT_QMKST2).
*--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_QMKST INDEX 1 INTO DATA(WA_QMKST2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<QMKST>-QUANTITAT = 1.
<QMKST>-MESSWERTE = 1.
<QMKST>-PRUEFKAT = 1.
<QMKST>-TOLEROBEN = 1.
<QMKST>-TOLERUNTEN = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_QMKST-SOLLPRUEF, sy-vline,
  WA_QMKST-PUMFKZ, sy-vline,
  WA_QMKST-LZEITKZ, sy-vline,
  WA_QMKST-ESTUKZ, sy-vline,
  WA_QMKST-DOKUKZ, sy-vline,
  WA_QMKST-RZWANG, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_QMKST 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_QMKST 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_QMKST INTO WA_QMKST.


*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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_QMKST_STR, 
QUANTITAT TYPE STRING,
MESSWERTE TYPE STRING,
PRUEFKAT TYPE STRING,
TOLEROBEN TYPE STRING,
TOLERUNTEN TYPE STRING,
SOLLPRUEF TYPE STRING,
PUMFKZ TYPE STRING,
LZEITKZ TYPE STRING,
ESTUKZ TYPE STRING,
DOKUKZ TYPE STRING,
RZWANG TYPE STRING,
SYNCRO TYPE STRING,
ADDPRO TYPE STRING,
ZERSTPRF TYPE STRING,
FORMELMK TYPE STRING,
STICHPR TYPE STRING,
AUSSLOS TYPE STRING,
FIXIERT TYPE STRING,
BEWFHLZHL TYPE STRING,
LSTKZ TYPE STRING,
VORGAEND TYPE STRING,
PMMZWANG TYPE STRING,
FEHLREC TYPE STRING,
AENDBELEG TYPE STRING,
QSPCMK TYPE STRING,
KEINDRUCK TYPE STRING,
PARA TYPE STRING,
PROCESSMK TYPE STRING,END OF T_EKKO_STR.
DATA: WA_QMKST_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_QMKST_STR-QUANTITAT sy-vline 
WA_QMKST_STR-MESSWERTE sy-vline 
WA_QMKST_STR-PRUEFKAT sy-vline 
WA_QMKST_STR-TOLEROBEN sy-vline 
WA_QMKST_STR-TOLERUNTEN sy-vline 
WA_QMKST_STR-SOLLPRUEF sy-vline 
WA_QMKST_STR-PUMFKZ sy-vline 
WA_QMKST_STR-LZEITKZ sy-vline 
WA_QMKST_STR-ESTUKZ sy-vline 
WA_QMKST_STR-DOKUKZ sy-vline 
WA_QMKST_STR-RZWANG sy-vline 
WA_QMKST_STR-SYNCRO sy-vline 
WA_QMKST_STR-ADDPRO sy-vline 
WA_QMKST_STR-ZERSTPRF sy-vline 
WA_QMKST_STR-FORMELMK sy-vline 
WA_QMKST_STR-STICHPR sy-vline 
WA_QMKST_STR-AUSSLOS sy-vline 
WA_QMKST_STR-FIXIERT sy-vline 
WA_QMKST_STR-BEWFHLZHL sy-vline 
WA_QMKST_STR-LSTKZ sy-vline 
WA_QMKST_STR-VORGAEND sy-vline 
WA_QMKST_STR-PMMZWANG sy-vline 
WA_QMKST_STR-FEHLREC sy-vline 
WA_QMKST_STR-AENDBELEG sy-vline 
WA_QMKST_STR-QSPCMK sy-vline 
WA_QMKST_STR-KEINDRUCK sy-vline 
WA_QMKST_STR-PARA sy-vline 
WA_QMKST_STR-PROCESSMK sy-vline      INTO ld_text SEPARATED BY SPACE.

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