ABAP Select data from SAP table CKMLO into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CKMLO
*  INTO TABLE @DATA(IT_CKMLO2).
*--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_CKMLO INDEX 1 INTO DATA(WA_CKMLO2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CKMLO>-MANDT = 1.
<CKMLO>-BWKEY = 1.
<CKMLO>-BDATJ = 1.
<CKMLO>-POPER = 1.
<CKMLO>-ABRERL = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CKMLO-ABRUSER, sy-vline,
  WA_CKMLO-ABRDAT, sy-vline,
  WA_CKMLO-ABRUHR, sy-vline,
  WA_CKMLO-ABSERL, sy-vline,
  WA_CKMLO-ABSUSER, sy-vline,
  WA_CKMLO-ABSDAT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CKMLO 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_CKMLO 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_CKMLO INTO WA_CKMLO.


*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 GJAHR, internal->external for field BDATJ
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_CKMLO-BDATJ
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CKMLO-BDATJ.
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_CKMLO_STR, 
MANDT TYPE STRING,
BWKEY TYPE STRING,
BDATJ TYPE STRING,
POPER TYPE STRING,
ABRERL TYPE STRING,
ABRUSER TYPE STRING,
ABRDAT TYPE STRING,
ABRUHR TYPE STRING,
ABSERL TYPE STRING,
ABSUSER TYPE STRING,
ABSDAT TYPE STRING,
ABSUHR TYPE STRING,
PERLOCK TYPE STRING,
LOCKUSER TYPE STRING,
LOCKDATE TYPE STRING,
LOCKTIME TYPE STRING,
LOCKRUN TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CKMLO_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_CKMLO_STR-MANDT sy-vline 
WA_CKMLO_STR-BWKEY sy-vline 
WA_CKMLO_STR-BDATJ sy-vline 
WA_CKMLO_STR-POPER sy-vline 
WA_CKMLO_STR-ABRERL sy-vline 
WA_CKMLO_STR-ABRUSER sy-vline 
WA_CKMLO_STR-ABRDAT sy-vline 
WA_CKMLO_STR-ABRUHR sy-vline 
WA_CKMLO_STR-ABSERL sy-vline 
WA_CKMLO_STR-ABSUSER sy-vline 
WA_CKMLO_STR-ABSDAT sy-vline 
WA_CKMLO_STR-ABSUHR sy-vline 
WA_CKMLO_STR-PERLOCK sy-vline 
WA_CKMLO_STR-LOCKUSER sy-vline 
WA_CKMLO_STR-LOCKDATE sy-vline 
WA_CKMLO_STR-LOCKTIME sy-vline 
WA_CKMLO_STR-LOCKRUN sy-vline      INTO ld_text SEPARATED BY SPACE.

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