ABAP Select data from SAP table MCQMEL_KYF into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MCQMEL_KYF
*  INTO TABLE @DATA(IT_MCQMEL_KYF2).
*--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_MCQMEL_KYF INDEX 1 INTO DATA(WA_MCQMEL_KYF2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MCQMEL_KYF>-EHTAG = 1.
<MCQMEL_KYF>-BASIC_UNIT = 1.
<MCQMEL_KYF>-MGEIN = 1.
<MCQMEL_KYF>-ZHLMELD = 1.
<MCQMEL_KYF>-ZHLMOFN = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MCQMEL_KYF-ZHLERL_TE, sy-vline,
  WA_MCQMEL_KYF-SUMDLZT, sy-vline,
  WA_MCQMEL_KYF-ZHLMASS, sy-vline,
  WA_MCQMEL_KYF-ZHLMAOF, sy-vline,
  WA_MCQMEL_KYF-ZHLMERF, sy-vline,
  WA_MCQMEL_KYF-MGEIG, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MCQMEL_KYF 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_MCQMEL_KYF 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_MCQMEL_KYF INTO WA_MCQMEL_KYF.


*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 EHTAG
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_MCQMEL_KYF-EHTAG
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCQMEL_KYF-EHTAG.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field BASIC_UNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_MCQMEL_KYF-BASIC_UNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCQMEL_KYF-BASIC_UNIT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MGEIN
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_MCQMEL_KYF-MGEIN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCQMEL_KYF-MGEIN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field SUNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_MCQMEL_KYF-SUNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCQMEL_KYF-SUNIT.
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_MCQMEL_KYF_STR, 
EHTAG TYPE STRING,
BASIC_UNIT TYPE STRING,
MGEIN TYPE STRING,
ZHLMELD TYPE STRING,
ZHLMOFN TYPE STRING,
ZHLERL_TE TYPE STRING,
SUMDLZT TYPE STRING,
ZHLMASS TYPE STRING,
ZHLMAOF TYPE STRING,
ZHLMERF TYPE STRING,
MGEIG TYPE STRING,
BMGEIG TYPE STRING,
MGFRD TYPE STRING,
BMGFRD TYPE STRING,
RKMNG TYPE STRING,
BRKMNG TYPE STRING,
RGMNG TYPE STRING,
BRGMNG TYPE STRING,
MSAUS TYPE STRING,
AUSZT1 TYPE STRING,
SUNIT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MCQMEL_KYF_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_MCQMEL_KYF_STR-EHTAG sy-vline 
WA_MCQMEL_KYF_STR-BASIC_UNIT sy-vline 
WA_MCQMEL_KYF_STR-MGEIN sy-vline 
WA_MCQMEL_KYF_STR-ZHLMELD sy-vline 
WA_MCQMEL_KYF_STR-ZHLMOFN sy-vline 
WA_MCQMEL_KYF_STR-ZHLERL_TE sy-vline 
WA_MCQMEL_KYF_STR-SUMDLZT sy-vline 
WA_MCQMEL_KYF_STR-ZHLMASS sy-vline 
WA_MCQMEL_KYF_STR-ZHLMAOF sy-vline 
WA_MCQMEL_KYF_STR-ZHLMERF sy-vline 
WA_MCQMEL_KYF_STR-MGEIG sy-vline 
WA_MCQMEL_KYF_STR-BMGEIG sy-vline 
WA_MCQMEL_KYF_STR-MGFRD sy-vline 
WA_MCQMEL_KYF_STR-BMGFRD sy-vline 
WA_MCQMEL_KYF_STR-RKMNG sy-vline 
WA_MCQMEL_KYF_STR-BRKMNG sy-vline 
WA_MCQMEL_KYF_STR-RGMNG sy-vline 
WA_MCQMEL_KYF_STR-BRGMNG sy-vline 
WA_MCQMEL_KYF_STR-MSAUS sy-vline 
WA_MCQMEL_KYF_STR-AUSZT1 sy-vline 
WA_MCQMEL_KYF_STR-SUNIT sy-vline      INTO ld_text SEPARATED BY SPACE.

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