ABAP Select data from SAP table MCLOGGING into internal table

Get Example source ABAP code based on a different SAP table
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Below is a number of ABAP code snippets to demonstrate how to select data from SAP MCLOGGING 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 MCLOGGING. 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 MCLOGGING 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_MCLOGGING TYPE STANDARD TABLE OF MCLOGGING,
      WA_MCLOGGING TYPE MCLOGGING,
      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: <MCLOGGING> TYPE MCLOGGING.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MCLOGGING
*  INTO TABLE @DATA(IT_MCLOGGING2).
*--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_MCLOGGING INDEX 1 INTO DATA(WA_MCLOGGING2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MCLOGGING>-VBELN = 1.
<MCLOGGING>-POSNR = 1.
<MCLOGGING>-PARVW = 1.
<MCLOGGING>-ETENR = 1.
<MCLOGGING>-KSCHL = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MCLOGGING-FKDAT, sy-vline,
  WA_MCLOGGING-GSTRU, sy-vline,
  WA_MCLOGGING-ZEITP, sy-vline,
  WA_MCLOGGING-STAFO, sy-vline,
  WA_MCLOGGING-FROUT, sy-vline,
  WA_MCLOGGING-STFNA, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MCLOGGING 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_MCLOGGING 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_MCLOGGING INTO WA_MCLOGGING.


*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 PARVW, internal->external for field PARVW
CALL FUNCTION 'CONVERSION_EXIT_PARVW_OUTPUT'
  EXPORTING
    input =                      WA_MCLOGGING-PARVW
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCLOGGING-PARVW.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit ALPHA, internal->external for field LIFNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MCLOGGING-LIFNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCLOGGING-LIFNR.
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_MCLOGGING_STR, 
VBELN TYPE STRING,
POSNR TYPE STRING,
PARVW TYPE STRING,
ETENR TYPE STRING,
KSCHL TYPE STRING,
FKDAT TYPE STRING,
GSTRU TYPE STRING,
ZEITP TYPE STRING,
STAFO TYPE STRING,
FROUT TYPE STRING,
STFNA TYPE STRING,
KEY TYPE STRING,
DATA TYPE STRING,
SUPKZ TYPE STRING,
REASON TYPE STRING,
DATE TYPE STRING,
UNIT TYPE STRING,
EXREQR TYPE STRING,
EXZERO TYPE STRING,
EXINIT TYPE STRING,
EXEXPR TYPE STRING,
EXFORM TYPE STRING,
EXFOME TYPE STRING,
LIFNR TYPE STRING,
LIFPO TYPE STRING,
MCINF TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MCLOGGING_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_MCLOGGING_STR-VBELN sy-vline 
WA_MCLOGGING_STR-POSNR sy-vline 
WA_MCLOGGING_STR-PARVW sy-vline 
WA_MCLOGGING_STR-ETENR sy-vline 
WA_MCLOGGING_STR-KSCHL sy-vline 
WA_MCLOGGING_STR-FKDAT sy-vline 
WA_MCLOGGING_STR-GSTRU sy-vline 
WA_MCLOGGING_STR-ZEITP sy-vline 
WA_MCLOGGING_STR-STAFO sy-vline 
WA_MCLOGGING_STR-FROUT sy-vline 
WA_MCLOGGING_STR-STFNA sy-vline 
WA_MCLOGGING_STR-KEY sy-vline 
WA_MCLOGGING_STR-DATA sy-vline 
WA_MCLOGGING_STR-SUPKZ sy-vline 
WA_MCLOGGING_STR-REASON sy-vline 
WA_MCLOGGING_STR-DATE sy-vline 
WA_MCLOGGING_STR-UNIT sy-vline 
WA_MCLOGGING_STR-EXREQR sy-vline 
WA_MCLOGGING_STR-EXZERO sy-vline 
WA_MCLOGGING_STR-EXINIT sy-vline 
WA_MCLOGGING_STR-EXEXPR sy-vline 
WA_MCLOGGING_STR-EXFORM sy-vline 
WA_MCLOGGING_STR-EXFOME sy-vline 
WA_MCLOGGING_STR-LIFNR sy-vline 
WA_MCLOGGING_STR-LIFPO sy-vline 
WA_MCLOGGING_STR-MCINF sy-vline      INTO ld_text SEPARATED BY SPACE.

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