ABAP Select data from SAP table QMMAPCAT into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM QMMAPCAT
*  INTO TABLE @DATA(IT_QMMAPCAT2).
*--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_QMMAPCAT INDEX 1 INTO DATA(WA_QMMAPCAT2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<QMMAPCAT>-MANDT = 1.
<QMMAPCAT>-QMNUM = 1.
<QMMAPCAT>-MANUM = 1.
<QMMAPCAT>-FENUM = 1.
<QMMAPCAT>-URNUM = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_QMMAPCAT-MNKAT, sy-vline,
  WA_QMMAPCAT-MNGRP, sy-vline,
  WA_QMMAPCAT-MNCOD, sy-vline,
  WA_QMMAPCAT-MNVER, sy-vline,
  WA_QMMAPCAT-MATXT, sy-vline,
  WA_QMMAPCAT-ERNAM, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_QMMAPCAT 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_QMMAPCAT 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_QMMAPCAT INTO WA_QMMAPCAT.


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

*Conversion exit ALPHA, internal->external for field MNVER
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_QMMAPCAT-MNVER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_QMMAPCAT-MNVER.
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_QMMAPCAT_STR, 
MANDT TYPE STRING,
QMNUM TYPE STRING,
MANUM TYPE STRING,
FENUM TYPE STRING,
URNUM TYPE STRING,
MNKAT TYPE STRING,
MNGRP TYPE STRING,
MNCOD TYPE STRING,
MNVER TYPE STRING,
MATXT TYPE STRING,
ERNAM TYPE STRING,
ERDAT TYPE STRING,
AENAM TYPE STRING,
AEDAT TYPE STRING,
MAKLS TYPE STRING,
KLAKZ TYPE STRING,
PSTER TYPE STRING,
PETER TYPE STRING,
INDTX TYPE STRING,
KZMLA TYPE STRING,
MNGFA TYPE STRING,
PSTUR TYPE STRING,
PETUR TYPE STRING,
ERZEIT TYPE STRING,
AEZEIT TYPE STRING,
KZLOESCH TYPE STRING,
QMANUM TYPE STRING,
AUTKZ TYPE STRING,
KZACTIONBOX TYPE STRING,
FUNKTION TYPE STRING,
CHANGEDDATETIME TYPE STRING,
DUMMY_QMMA_INCL_EEW_PS TYPE STRING,
KTXTCD TYPE STRING,
KTXTGR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_QMMAPCAT_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_QMMAPCAT_STR-MANDT sy-vline 
WA_QMMAPCAT_STR-QMNUM sy-vline 
WA_QMMAPCAT_STR-MANUM sy-vline 
WA_QMMAPCAT_STR-FENUM sy-vline 
WA_QMMAPCAT_STR-URNUM sy-vline 
WA_QMMAPCAT_STR-MNKAT sy-vline 
WA_QMMAPCAT_STR-MNGRP sy-vline 
WA_QMMAPCAT_STR-MNCOD sy-vline 
WA_QMMAPCAT_STR-MNVER sy-vline 
WA_QMMAPCAT_STR-MATXT sy-vline 
WA_QMMAPCAT_STR-ERNAM sy-vline 
WA_QMMAPCAT_STR-ERDAT sy-vline 
WA_QMMAPCAT_STR-AENAM sy-vline 
WA_QMMAPCAT_STR-AEDAT sy-vline 
WA_QMMAPCAT_STR-MAKLS sy-vline 
WA_QMMAPCAT_STR-KLAKZ sy-vline 
WA_QMMAPCAT_STR-PSTER sy-vline 
WA_QMMAPCAT_STR-PETER sy-vline 
WA_QMMAPCAT_STR-INDTX sy-vline 
WA_QMMAPCAT_STR-KZMLA sy-vline 
WA_QMMAPCAT_STR-MNGFA sy-vline 
WA_QMMAPCAT_STR-PSTUR sy-vline 
WA_QMMAPCAT_STR-PETUR sy-vline 
WA_QMMAPCAT_STR-ERZEIT sy-vline 
WA_QMMAPCAT_STR-AEZEIT sy-vline 
WA_QMMAPCAT_STR-KZLOESCH sy-vline 
WA_QMMAPCAT_STR-QMANUM sy-vline 
WA_QMMAPCAT_STR-AUTKZ sy-vline 
WA_QMMAPCAT_STR-KZACTIONBOX sy-vline 
WA_QMMAPCAT_STR-FUNKTION sy-vline 
WA_QMMAPCAT_STR-CHANGEDDATETIME sy-vline 
WA_QMMAPCAT_STR-DUMMY_QMMA_INCL_EEW_PS sy-vline 
WA_QMMAPCAT_STR-KTXTCD sy-vline 
WA_QMMAPCAT_STR-KTXTGR sy-vline      INTO ld_text SEPARATED BY SPACE.

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