ABAP Select data from SAP table ENTITYTOFIELD into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ENTITYTOFIELD
*  INTO TABLE @DATA(IT_ENTITYTOFIELD2).
*--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_ENTITYTOFIELD INDEX 1 INTO DATA(WA_ENTITYTOFIELD2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ENTITYTOFIELD>-MANDT = 1.
<ENTITYTOFIELD>-ENTITYID = 1.
<ENTITYTOFIELD>-BUSCONTEXTID = 1.
<ENTITYTOFIELD>-TECHNICALETNAME = 1.
<ENTITYTOFIELD>-SEQNO = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ENTITYTOFIELD-ISOPTIONAL, sy-vline,
  WA_ENTITYTOFIELD-CREATEDBY, sy-vline,
  WA_ENTITYTOFIELD-CHANGEDBY, sy-vline,
  WA_ENTITYTOFIELD-CREATEDATETIME, sy-vline,
  WA_ENTITYTOFIELD-CHANGEDATETIME, sy-vline,
  WA_ENTITYTOFIELD-STRUCTURE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ENTITYTOFIELD 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_ENTITYTOFIELD 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_ENTITYTOFIELD INTO WA_ENTITYTOFIELD.


*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_ENTITYTOFIELD_STR, 
MANDT TYPE STRING,
ENTITYID TYPE STRING,
BUSCONTEXTID TYPE STRING,
TECHNICALETNAME TYPE STRING,
SEQNO TYPE STRING,
ISOPTIONAL TYPE STRING,
CREATEDBY TYPE STRING,
CHANGEDBY TYPE STRING,
CREATEDATETIME TYPE STRING,
CHANGEDATETIME TYPE STRING,
STRUCTURE TYPE STRING,
ENTITYTOFIELD TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ENTITYTOFIELD_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_ENTITYTOFIELD_STR-MANDT sy-vline 
WA_ENTITYTOFIELD_STR-ENTITYID sy-vline 
WA_ENTITYTOFIELD_STR-BUSCONTEXTID sy-vline 
WA_ENTITYTOFIELD_STR-TECHNICALETNAME sy-vline 
WA_ENTITYTOFIELD_STR-SEQNO sy-vline 
WA_ENTITYTOFIELD_STR-ISOPTIONAL sy-vline 
WA_ENTITYTOFIELD_STR-CREATEDBY sy-vline 
WA_ENTITYTOFIELD_STR-CHANGEDBY sy-vline 
WA_ENTITYTOFIELD_STR-CREATEDATETIME sy-vline 
WA_ENTITYTOFIELD_STR-CHANGEDATETIME sy-vline 
WA_ENTITYTOFIELD_STR-STRUCTURE sy-vline 
WA_ENTITYTOFIELD_STR-ENTITYTOFIELD sy-vline      INTO ld_text SEPARATED BY SPACE.

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