ABAP Select data from SAP table CMIG_KEYCLS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CMIG_KEYCLS
*  INTO TABLE @DATA(IT_CMIG_KEYCLS2).
*--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_CMIG_KEYCLS INDEX 1 INTO DATA(WA_CMIG_KEYCLS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CMIG_KEYCLS>-STLTY = 1.
<CMIG_KEYCLS>-STLNR = 1.
<CMIG_KEYCLS>-STLAL = 1.
<CMIG_KEYCLS>-STKOZ = 1.
<CMIG_KEYCLS>-STVKN = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CMIG_KEYCLS-STLKN, sy-vline,
  WA_CMIG_KEYCLS-PLNTY, sy-vline,
  WA_CMIG_KEYCLS-PLNNR, sy-vline,
  WA_CMIG_KEYCLS-PLNAL, sy-vline,
  WA_CMIG_KEYCLS-PLNKN, sy-vline,
  WA_CMIG_KEYCLS-PLNFL, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CMIG_KEYCLS 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_CMIG_KEYCLS 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_CMIG_KEYCLS INTO WA_CMIG_KEYCLS.


*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 NUMCV, internal->external for field STLNR
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_CMIG_KEYCLS-STLNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CMIG_KEYCLS-STLNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field STLAL
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_CMIG_KEYCLS-STLAL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CMIG_KEYCLS-STLAL.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field PLNNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_CMIG_KEYCLS-PLNNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CMIG_KEYCLS-PLNNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field PLNAL
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_CMIG_KEYCLS-PLNAL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CMIG_KEYCLS-PLNAL.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field PLNFL
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_CMIG_KEYCLS-PLNFL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CMIG_KEYCLS-PLNFL.
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_CMIG_KEYCLS_STR, 
STLTY TYPE STRING,
STLNR TYPE STRING,
STLAL TYPE STRING,
STKOZ TYPE STRING,
STVKN TYPE STRING,
STLKN TYPE STRING,
PLNTY TYPE STRING,
PLNNR TYPE STRING,
PLNAL TYPE STRING,
PLNKN TYPE STRING,
PLNFL TYPE STRING,
ZAEHL TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CMIG_KEYCLS_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_CMIG_KEYCLS_STR-STLTY sy-vline 
WA_CMIG_KEYCLS_STR-STLNR sy-vline 
WA_CMIG_KEYCLS_STR-STLAL sy-vline 
WA_CMIG_KEYCLS_STR-STKOZ sy-vline 
WA_CMIG_KEYCLS_STR-STVKN sy-vline 
WA_CMIG_KEYCLS_STR-STLKN sy-vline 
WA_CMIG_KEYCLS_STR-PLNTY sy-vline 
WA_CMIG_KEYCLS_STR-PLNNR sy-vline 
WA_CMIG_KEYCLS_STR-PLNAL sy-vline 
WA_CMIG_KEYCLS_STR-PLNKN sy-vline 
WA_CMIG_KEYCLS_STR-PLNFL sy-vline 
WA_CMIG_KEYCLS_STR-ZAEHL sy-vline      INTO ld_text SEPARATED BY SPACE.

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