ABAP Select data from SAP table EMS_UDF_DISP into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM EMS_UDF_DISP
*  INTO TABLE @DATA(IT_EMS_UDF_DISP2).
*--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_EMS_UDF_DISP INDEX 1 INTO DATA(WA_EMS_UDF_DISP2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<EMS_UDF_DISP>-KV_DATA_TYPE_NAME = 1.
<EMS_UDF_DISP>-KV_ELEMENT_NAME = 1.
<EMS_UDF_DISP>-KV_STRING_VALUE = 1.
<EMS_UDF_DISP>-KV_UNIT = 1.
<EMS_UDF_DISP>-VAL_AREA_ID_NAME = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline, ENDLOOP.
   
*Add any further fields from structure WA_EMS_UDF_DISP 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_EMS_UDF_DISP 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_EMS_UDF_DISP INTO WA_EMS_UDF_DISP.


*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 KV_UNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_EMS_UDF_DISP-KV_UNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_EMS_UDF_DISP-KV_UNIT.
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_EMS_UDF_DISP_STR, 
KV_DATA_TYPE_NAME TYPE STRING,
KV_ELEMENT_NAME TYPE STRING,
KV_STRING_VALUE TYPE STRING,
KV_UNIT TYPE STRING,
VAL_AREA_ID_NAME TYPE STRING,END OF T_EKKO_STR.
DATA: WA_EMS_UDF_DISP_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_EMS_UDF_DISP_STR-KV_DATA_TYPE_NAME sy-vline 
WA_EMS_UDF_DISP_STR-KV_ELEMENT_NAME sy-vline 
WA_EMS_UDF_DISP_STR-KV_STRING_VALUE sy-vline 
WA_EMS_UDF_DISP_STR-KV_UNIT sy-vline 
WA_EMS_UDF_DISP_STR-VAL_AREA_ID_NAME sy-vline      INTO ld_text SEPARATED BY SPACE.

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