ABAP Select data from SAP table MCQKENNZ2 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP MCQKENNZ2 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 MCQKENNZ2. 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 MCQKENNZ2 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_MCQKENNZ2 TYPE STANDARD TABLE OF MCQKENNZ2,
      WA_MCQKENNZ2 TYPE MCQKENNZ2,
      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: <MCQKENNZ2> TYPE MCQKENNZ2.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_MCQKENNZ2.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM MCQKENNZ2
  INTO TABLE IT_MCQKENNZ2.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MCQKENNZ2
*  INTO TABLE @DATA(IT_MCQKENNZ22).
*--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_MCQKENNZ2 INDEX 1 INTO DATA(WA_MCQKENNZ22).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_MCQKENNZ2 ASSIGNING <MCQKENNZ2>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MCQKENNZ2>-ZHLN = 1.
<MCQKENNZ2>-ZHLNA = 1.
<MCQKENNZ2>-ZHLNR = 1.
<MCQKENNZ2>-ZHLNSKIP = 1.
<MCQKENNZ2>-ZHLNF = 1.

ENDLOOP.

LOOP AT IT_MCQKENNZ2 INTO WA_MCQKENNZ2.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MCQKENNZ2-ZHLNFEH, sy-vline,
  WA_MCQKENNZ2-ZHLNTOLU, sy-vline,
  WA_MCQKENNZ2-ZHLNTOLO, sy-vline,
  WA_MCQKENNZ2-ZHLNSTPF, sy-vline,
  WA_MCQKENNZ2-ZHLNKF, sy-vline,
  WA_MCQKENNZ2-ZHLNHF, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MCQKENNZ2 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_MCQKENNZ2 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_MCQKENNZ2 INTO WA_MCQKENNZ2.


*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_MCQKENNZ2_STR, 
ZHLN TYPE STRING,
ZHLNA TYPE STRING,
ZHLNR TYPE STRING,
ZHLNSKIP TYPE STRING,
ZHLNF TYPE STRING,
ZHLNFEH TYPE STRING,
ZHLNTOLU TYPE STRING,
ZHLNTOLO TYPE STRING,
ZHLNSTPF TYPE STRING,
ZHLNKF TYPE STRING,
ZHLNHF TYPE STRING,
ZHLNNF TYPE STRING,
SUMFANT TYPE STRING,
SUMFEHLEH TYPE STRING,
XQUER TYPE STRING,
SIGMA TYPE STRING,
CP TYPE STRING,
CPK TYPE STRING,
ZHLNSTAT TYPE STRING,
QUERGES TYPE STRING,
XQUERQUER TYPE STRING,
SUMVARIN TYPE STRING,
SUMSIGMAST TYPE STRING,
SUMVAR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MCQKENNZ2_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_MCQKENNZ2_STR-ZHLN sy-vline 
WA_MCQKENNZ2_STR-ZHLNA sy-vline 
WA_MCQKENNZ2_STR-ZHLNR sy-vline 
WA_MCQKENNZ2_STR-ZHLNSKIP sy-vline 
WA_MCQKENNZ2_STR-ZHLNF sy-vline 
WA_MCQKENNZ2_STR-ZHLNFEH sy-vline 
WA_MCQKENNZ2_STR-ZHLNTOLU sy-vline 
WA_MCQKENNZ2_STR-ZHLNTOLO sy-vline 
WA_MCQKENNZ2_STR-ZHLNSTPF sy-vline 
WA_MCQKENNZ2_STR-ZHLNKF sy-vline 
WA_MCQKENNZ2_STR-ZHLNHF sy-vline 
WA_MCQKENNZ2_STR-ZHLNNF sy-vline 
WA_MCQKENNZ2_STR-SUMFANT sy-vline 
WA_MCQKENNZ2_STR-SUMFEHLEH sy-vline 
WA_MCQKENNZ2_STR-XQUER sy-vline 
WA_MCQKENNZ2_STR-SIGMA sy-vline 
WA_MCQKENNZ2_STR-CP sy-vline 
WA_MCQKENNZ2_STR-CPK sy-vline 
WA_MCQKENNZ2_STR-ZHLNSTAT sy-vline 
WA_MCQKENNZ2_STR-QUERGES sy-vline 
WA_MCQKENNZ2_STR-XQUERQUER sy-vline 
WA_MCQKENNZ2_STR-SUMVARIN sy-vline 
WA_MCQKENNZ2_STR-SUMSIGMAST sy-vline 
WA_MCQKENNZ2_STR-SUMVAR sy-vline      INTO ld_text SEPARATED BY SPACE.

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