ABAP Select data from SAP table EREN into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM EREN
*  INTO TABLE @DATA(IT_EREN2).
*--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_EREN INDEX 1 INTO DATA(WA_EREN2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<EREN>-MANDT = 1.
<EREN>-ERENR = 1.
<EREN>-ERK01 = 1.
<EREN>-ERK02 = 1.
<EREN>-ERK03 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_EREN-ERK04, sy-vline,
  WA_EREN-ERK05, sy-vline,
  WA_EREN-ERK06, sy-vline,
  WA_EREN-ERK07, sy-vline,
  WA_EREN-ERK08, sy-vline,
  WA_EREN-ERK09, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_EREN 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_EREN 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_EREN INTO WA_EREN.


*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_EREN_STR, 
MANDT TYPE STRING,
ERENR 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,
PERKZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_EREN_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_EREN_STR-MANDT sy-vline 
WA_EREN_STR-ERENR sy-vline 
WA_EREN_STR-ERK01 sy-vline 
WA_EREN_STR-ERK02 sy-vline 
WA_EREN_STR-ERK03 sy-vline 
WA_EREN_STR-ERK04 sy-vline 
WA_EREN_STR-ERK05 sy-vline 
WA_EREN_STR-ERK06 sy-vline 
WA_EREN_STR-ERK07 sy-vline 
WA_EREN_STR-ERK08 sy-vline 
WA_EREN_STR-ERK09 sy-vline 
WA_EREN_STR-ERK10 sy-vline 
WA_EREN_STR-ERK11 sy-vline 
WA_EREN_STR-ERK12 sy-vline 
WA_EREN_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.