ABAP Select data from SAP table MCQKENNZ1 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP MCQKENNZ1 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 MCQKENNZ1. 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 MCQKENNZ1 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_MCQKENNZ1 TYPE STANDARD TABLE OF MCQKENNZ1,
      WA_MCQKENNZ1 TYPE MCQKENNZ1,
      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: <MCQKENNZ1> TYPE MCQKENNZ1.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_MCQKENNZ1.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM MCQKENNZ1
  INTO TABLE IT_MCQKENNZ1.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MCQKENNZ1
*  INTO TABLE @DATA(IT_MCQKENNZ12).
*--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_MCQKENNZ1 INDEX 1 INTO DATA(WA_MCQKENNZ12).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_MCQKENNZ1 ASSIGNING <MCQKENNZ1>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MCQKENNZ1>-ZHLMELD = 1.
<MCQKENNZ1>-ZHLMOFN = 1.
<MCQKENNZ1>-ZHLMIAR = 1.
<MCQKENNZ1>-ZHLMMAB = 1.
<MCQKENNZ1>-ZHLMRST = 1.

ENDLOOP.

LOOP AT IT_MCQKENNZ1 INTO WA_MCQKENNZ1.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MCQKENNZ1-ZHLERL_TE, sy-vline,
  WA_MCQKENNZ1-ZHLMASS, sy-vline,
  WA_MCQKENNZ1-ZHLMAOF, sy-vline,
  WA_MCQKENNZ1-ZHLMAER, sy-vline,
  WA_MCQKENNZ1-ZHLMERF, sy-vline,
  WA_MCQKENNZ1-ZHLPROBL, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MCQKENNZ1 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_MCQKENNZ1 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_MCQKENNZ1 INTO WA_MCQKENNZ1.


*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 EINHTAG
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_MCQKENNZ1-EINHTAG
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCQKENNZ1-EINHTAG.
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_MCQKENNZ1_STR, 
ZHLMELD TYPE STRING,
ZHLMOFN TYPE STRING,
ZHLMIAR TYPE STRING,
ZHLMMAB TYPE STRING,
ZHLMRST TYPE STRING,
ZHLERL_TE TYPE STRING,
ZHLMASS TYPE STRING,
ZHLMAOF TYPE STRING,
ZHLMAER TYPE STRING,
ZHLMERF TYPE STRING,
ZHLPROBL TYPE STRING,
ZHLFEHL TYPE STRING,
ZHLFPRF TYPE STRING,
SUMDLZT TYPE STRING,
EINHTAG TYPE STRING,
SUMFBEW TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MCQKENNZ1_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_MCQKENNZ1_STR-ZHLMELD sy-vline 
WA_MCQKENNZ1_STR-ZHLMOFN sy-vline 
WA_MCQKENNZ1_STR-ZHLMIAR sy-vline 
WA_MCQKENNZ1_STR-ZHLMMAB sy-vline 
WA_MCQKENNZ1_STR-ZHLMRST sy-vline 
WA_MCQKENNZ1_STR-ZHLERL_TE sy-vline 
WA_MCQKENNZ1_STR-ZHLMASS sy-vline 
WA_MCQKENNZ1_STR-ZHLMAOF sy-vline 
WA_MCQKENNZ1_STR-ZHLMAER sy-vline 
WA_MCQKENNZ1_STR-ZHLMERF sy-vline 
WA_MCQKENNZ1_STR-ZHLPROBL sy-vline 
WA_MCQKENNZ1_STR-ZHLFEHL sy-vline 
WA_MCQKENNZ1_STR-ZHLFPRF sy-vline 
WA_MCQKENNZ1_STR-SUMDLZT sy-vline 
WA_MCQKENNZ1_STR-EINHTAG sy-vline 
WA_MCQKENNZ1_STR-SUMFBEW sy-vline      INTO ld_text SEPARATED BY SPACE.

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