ABAP Select data from SAP table MCEKPOADD into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MCEKPOADD
*  INTO TABLE @DATA(IT_MCEKPOADD2).
*--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_MCEKPOADD INDEX 1 INTO DATA(WA_MCEKPOADD2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MCEKPOADD>-ESOKZ = 1.
<MCEKPOADD>-ALIEF = 1.
<MCEKPOADD>-LFZTA = 1.
<MCEKPOADD>-AKTWE = 1.
<MCEKPOADD>-KZTAB = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MCEKPOADD-TABW, sy-vline,
  WA_MCEKPOADD-KZMAB, sy-vline,
  WA_MCEKPOADD-MABW, sy-vline,
  WA_MCEKPOADD-PWTT, sy-vline,
  WA_MCEKPOADD-KZAVI, sy-vline,
  WA_MCEKPOADD-LAVI, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MCEKPOADD 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_MCEKPOADD 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_MCEKPOADD INTO WA_MCEKPOADD.


*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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_MCEKPOADD_STR, 
ESOKZ TYPE STRING,
ALIEF TYPE STRING,
LFZTA TYPE STRING,
AKTWE TYPE STRING,
KZTAB TYPE STRING,
TABW TYPE STRING,
KZMAB TYPE STRING,
MABW TYPE STRING,
PWTT TYPE STRING,
KZAVI TYPE STRING,
LAVI TYPE STRING,
ALAV TYPE STRING,
PWMT TYPE STRING,
KZWEV TYPE STRING,
PWEV TYPE STRING,
PWWE TYPE STRING,
PWFR TYPE STRING,
PWQA TYPE STRING,
KZPOS TYPE STRING,
KZKPO TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MCEKPOADD_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_MCEKPOADD_STR-ESOKZ sy-vline 
WA_MCEKPOADD_STR-ALIEF sy-vline 
WA_MCEKPOADD_STR-LFZTA sy-vline 
WA_MCEKPOADD_STR-AKTWE sy-vline 
WA_MCEKPOADD_STR-KZTAB sy-vline 
WA_MCEKPOADD_STR-TABW sy-vline 
WA_MCEKPOADD_STR-KZMAB sy-vline 
WA_MCEKPOADD_STR-MABW sy-vline 
WA_MCEKPOADD_STR-PWTT sy-vline 
WA_MCEKPOADD_STR-KZAVI sy-vline 
WA_MCEKPOADD_STR-LAVI sy-vline 
WA_MCEKPOADD_STR-ALAV sy-vline 
WA_MCEKPOADD_STR-PWMT sy-vline 
WA_MCEKPOADD_STR-KZWEV sy-vline 
WA_MCEKPOADD_STR-PWEV sy-vline 
WA_MCEKPOADD_STR-PWWE sy-vline 
WA_MCEKPOADD_STR-PWFR sy-vline 
WA_MCEKPOADD_STR-PWQA sy-vline 
WA_MCEKPOADD_STR-KZPOS sy-vline 
WA_MCEKPOADD_STR-KZKPO sy-vline      INTO ld_text SEPARATED BY SPACE.

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