ABAP Select data from SAP table EREF into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM EREF
*  INTO TABLE @DATA(IT_EREF2).
*--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_EREF INDEX 1 INTO DATA(WA_EREF2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<EREF>-MANDT = 1.
<EREF>-ERENR = 1.
<EREF>-OBJNR = 1.
<EREF>-WERKS = 1.
<EREF>-ZUODT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_EREF-ERK01, sy-vline,
  WA_EREF-ERK02, sy-vline,
  WA_EREF-ERK03, sy-vline,
  WA_EREF-ERK04, sy-vline,
  WA_EREF-ERK05, sy-vline,
  WA_EREF-ERK06, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_EREF 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_EREF 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_EREF INTO WA_EREF.


*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_EREF_STR, 
MANDT TYPE STRING,
ERENR TYPE STRING,
OBJNR TYPE STRING,
WERKS TYPE STRING,
ZUODT TYPE STRING,
ERK01 TYPE STRING,
ERK02 TYPE STRING,
ERK03 TYPE STRING,
ERK04 TYPE STRING,
ERK05 TYPE STRING,
ERK06 TYPE STRING,
ERK07 TYPE STRING,
ERK08 TYPE STRING,
ERK09 TYPE STRING,
ERK10 TYPE STRING,
ERK11 TYPE STRING,
ERK12 TYPE STRING,
ERFIX TYPE STRING,
PERKZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_EREF_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_EREF_STR-MANDT sy-vline 
WA_EREF_STR-ERENR sy-vline 
WA_EREF_STR-OBJNR sy-vline 
WA_EREF_STR-WERKS sy-vline 
WA_EREF_STR-ZUODT sy-vline 
WA_EREF_STR-ERK01 sy-vline 
WA_EREF_STR-ERK02 sy-vline 
WA_EREF_STR-ERK03 sy-vline 
WA_EREF_STR-ERK04 sy-vline 
WA_EREF_STR-ERK05 sy-vline 
WA_EREF_STR-ERK06 sy-vline 
WA_EREF_STR-ERK07 sy-vline 
WA_EREF_STR-ERK08 sy-vline 
WA_EREF_STR-ERK09 sy-vline 
WA_EREF_STR-ERK10 sy-vline 
WA_EREF_STR-ERK11 sy-vline 
WA_EREF_STR-ERK12 sy-vline 
WA_EREF_STR-ERFIX sy-vline 
WA_EREF_STR-PERKZ sy-vline      INTO ld_text SEPARATED BY SPACE.

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