ABAP Select data from SAP table M_ERDKA into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM M_ERDKA
*  INTO TABLE @DATA(IT_M_ERDKA2).
*--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_M_ERDKA INDEX 1 INTO DATA(WA_M_ERDKA2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<M_ERDKA>-MANDT = 1.
<M_ERDKA>-OPBEL = 1.
<M_ERDKA>-PARTNER = 1.
<M_ERDKA>-VKONT = 1.
<M_ERDKA>-BUDAT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_M_ERDKA-INTOPBEL, sy-vline,
  WA_M_ERDKA-SIMULATED, sy-vline,
  WA_M_ERDKA-TOBRELEASD, sy-vline,
  WA_M_ERDKA-ABWVK, sy-vline,
  WA_M_ERDKA-ERGRD, sy-vline,
  WA_M_ERDKA-FAEDN, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_M_ERDKA 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_M_ERDKA 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_M_ERDKA INTO WA_M_ERDKA.


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

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

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

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

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

*Conversion exit EXBEL, internal->external for field EXBEL
CALL FUNCTION 'CONVERSION_EXIT_EXBEL_OUTPUT'
  EXPORTING
    input =                      WA_M_ERDKA-EXBEL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_M_ERDKA-EXBEL.
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_M_ERDKA_STR, 
MANDT TYPE STRING,
OPBEL TYPE STRING,
PARTNER TYPE STRING,
VKONT TYPE STRING,
BUDAT TYPE STRING,
INTOPBEL TYPE STRING,
SIMULATED TYPE STRING,
TOBRELEASD TYPE STRING,
ABWVK TYPE STRING,
ERGRD TYPE STRING,
FAEDN TYPE STRING,
EXBEL TYPE STRING,
BILLING_PERIOD TYPE STRING,END OF T_EKKO_STR.
DATA: WA_M_ERDKA_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_M_ERDKA_STR-MANDT sy-vline 
WA_M_ERDKA_STR-OPBEL sy-vline 
WA_M_ERDKA_STR-PARTNER sy-vline 
WA_M_ERDKA_STR-VKONT sy-vline 
WA_M_ERDKA_STR-BUDAT sy-vline 
WA_M_ERDKA_STR-INTOPBEL sy-vline 
WA_M_ERDKA_STR-SIMULATED sy-vline 
WA_M_ERDKA_STR-TOBRELEASD sy-vline 
WA_M_ERDKA_STR-ABWVK sy-vline 
WA_M_ERDKA_STR-ERGRD sy-vline 
WA_M_ERDKA_STR-FAEDN sy-vline 
WA_M_ERDKA_STR-EXBEL sy-vline 
WA_M_ERDKA_STR-BILLING_PERIOD sy-vline      INTO ld_text SEPARATED BY SPACE.

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