ABAP Select data from SAP table MCEXLOG_04EMAT into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP MCEXLOG_04EMAT 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 MCEXLOG_04EMAT. 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 MCEXLOG_04EMAT 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_MCEXLOG_04EMAT TYPE STANDARD TABLE OF MCEXLOG_04EMAT,
      WA_MCEXLOG_04EMAT TYPE MCEXLOG_04EMAT,
      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: <MCEXLOG_04EMAT> TYPE MCEXLOG_04EMAT.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_MCEXLOG_04EMAT.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM MCEXLOG_04EMAT
  INTO TABLE IT_MCEXLOG_04EMAT.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MCEXLOG_04EMAT
*  INTO TABLE @DATA(IT_MCEXLOG_04EMAT2).
*--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_MCEXLOG_04EMAT INDEX 1 INTO DATA(WA_MCEXLOG_04EMAT2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_MCEXLOG_04EMAT ASSIGNING <MCEXLOG_04EMAT>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MCEXLOG_04EMAT>-TCODE = 1.
<MCEXLOG_04EMAT>-DATUM = 1.
<MCEXLOG_04EMAT>-UZEIT = 1.
<MCEXLOG_04EMAT>-UNAME = 1.
<MCEXLOG_04EMAT>-HOST = 1.

ENDLOOP.

LOOP AT IT_MCEXLOG_04EMAT INTO WA_MCEXLOG_04EMAT.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MCEXLOG_04EMAT-ROCANCEL, sy-vline,
  WA_MCEXLOG_04EMAT-VERID, sy-vline,
  WA_MCEXLOG_04EMAT-WERKS, sy-vline,
  WA_MCEXLOG_04EMAT-AMEIN, sy-vline,
  WA_MCEXLOG_04EMAT-LTRMI, sy-vline,
  WA_MCEXLOG_04EMAT-MATNR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MCEXLOG_04EMAT 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_MCEXLOG_04EMAT 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_MCEXLOG_04EMAT INTO WA_MCEXLOG_04EMAT.


*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 AMEIN
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_MCEXLOG_04EMAT-AMEIN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCEXLOG_04EMAT-AMEIN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_MCEXLOG_04EMAT-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCEXLOG_04EMAT-MATNR.
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_MCEXLOG_04EMAT_STR, 
TCODE TYPE STRING,
DATUM TYPE STRING,
UZEIT TYPE STRING,
UNAME TYPE STRING,
HOST TYPE STRING,
ROCANCEL TYPE STRING,
VERID TYPE STRING,
WERKS TYPE STRING,
AMEIN TYPE STRING,
LTRMI TYPE STRING,
MATNR TYPE STRING,
WEMNG TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MCEXLOG_04EMAT_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_MCEXLOG_04EMAT_STR-TCODE sy-vline 
WA_MCEXLOG_04EMAT_STR-DATUM sy-vline 
WA_MCEXLOG_04EMAT_STR-UZEIT sy-vline 
WA_MCEXLOG_04EMAT_STR-UNAME sy-vline 
WA_MCEXLOG_04EMAT_STR-HOST sy-vline 
WA_MCEXLOG_04EMAT_STR-ROCANCEL sy-vline 
WA_MCEXLOG_04EMAT_STR-VERID sy-vline 
WA_MCEXLOG_04EMAT_STR-WERKS sy-vline 
WA_MCEXLOG_04EMAT_STR-AMEIN sy-vline 
WA_MCEXLOG_04EMAT_STR-LTRMI sy-vline 
WA_MCEXLOG_04EMAT_STR-MATNR sy-vline 
WA_MCEXLOG_04EMAT_STR-WEMNG sy-vline      INTO ld_text SEPARATED BY SPACE.

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