ABAP Select data from SAP table EHPRCS_DECSUB_MIGR_DECFIELDS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM EHPRCS_DECSUB_MIGR_DECFIELDS
*  INTO TABLE @DATA(IT_EHPRCS_DECSUB_MIGR_DECFIELDS2).
*--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_EHPRCS_DECSUB_MIGR_DECFIELDS INDEX 1 INTO DATA(WA_EHPRCS_DECSUB_MIGR_DECFIELDS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<EHPRCS_DECSUB_MIGR_DECFIELDS>-REGLIST = 1.
<EHPRCS_DECSUB_MIGR_DECFIELDS>-SUBST_RECN = 1.
<EHPRCS_DECSUB_MIGR_DECFIELDS>-HOMOGMAT_RECN = 1.
<EHPRCS_DECSUB_MIGR_DECFIELDS>-HOMOGMAT_NAME = 1.
<EHPRCS_DECSUB_MIGR_DECFIELDS>-VALUE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_EHPRCS_DECSUB_MIGR_DECFIELDS-VALUEMIN, sy-vline,
  WA_EHPRCS_DECSUB_MIGR_DECFIELDS-VALUEMAX, sy-vline,
  WA_EHPRCS_DECSUB_MIGR_DECFIELDS-VUNIT, sy-vline,
  WA_EHPRCS_DECSUB_MIGR_DECFIELDS-WEIGHT, sy-vline,
  WA_EHPRCS_DECSUB_MIGR_DECFIELDS-WUNIT, sy-vline,
  WA_EHPRCS_DECSUB_MIGR_DECFIELDS-CONTAINED, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_EHPRCS_DECSUB_MIGR_DECFIELDS 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_EHPRCS_DECSUB_MIGR_DECFIELDS 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_EHPRCS_DECSUB_MIGR_DECFIELDS INTO WA_EHPRCS_DECSUB_MIGR_DECFIELDS.


*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 SUBST_RECN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_EHPRCS_DECSUB_MIGR_DECFIELDS-SUBST_RECN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_EHPRCS_DECSUB_MIGR_DECFIELDS-SUBST_RECN.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit EHFL8, internal->external for field VALUE
CALL FUNCTION 'CONVERSION_EXIT_EHFL8_OUTPUT'
  EXPORTING
    input =                      WA_EHPRCS_DECSUB_MIGR_DECFIELDS-VALUE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_EHPRCS_DECSUB_MIGR_DECFIELDS-VALUE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit EHFL8, internal->external for field VALUEMIN
CALL FUNCTION 'CONVERSION_EXIT_EHFL8_OUTPUT'
  EXPORTING
    input =                      WA_EHPRCS_DECSUB_MIGR_DECFIELDS-VALUEMIN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_EHPRCS_DECSUB_MIGR_DECFIELDS-VALUEMIN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit EHFL8, internal->external for field VALUEMAX
CALL FUNCTION 'CONVERSION_EXIT_EHFL8_OUTPUT'
  EXPORTING
    input =                      WA_EHPRCS_DECSUB_MIGR_DECFIELDS-VALUEMAX
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_EHPRCS_DECSUB_MIGR_DECFIELDS-VALUEMAX.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field VUNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_EHPRCS_DECSUB_MIGR_DECFIELDS-VUNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_EHPRCS_DECSUB_MIGR_DECFIELDS-VUNIT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field WUNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_EHPRCS_DECSUB_MIGR_DECFIELDS-WUNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_EHPRCS_DECSUB_MIGR_DECFIELDS-WUNIT.
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_EHPRCS_DECSUB_MIGR_DECFIELDS_STR, 
REGLIST TYPE STRING,
SUBST_RECN TYPE STRING,
HOMOGMAT_RECN TYPE STRING,
HOMOGMAT_NAME TYPE STRING,
VALUE TYPE STRING,
VALUEMIN TYPE STRING,
VALUEMAX TYPE STRING,
VUNIT TYPE STRING,
WEIGHT TYPE STRING,
WUNIT TYPE STRING,
CONTAINED TYPE STRING,
REMARK TYPE STRING,
ORIGIN TYPE STRING,
EXEMPTION TYPE STRING,
CLASS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_EHPRCS_DECSUB_MIGR_DECFIELDS_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_EHPRCS_DECSUB_MIGR_DECFIELDS_STR-REGLIST sy-vline 
WA_EHPRCS_DECSUB_MIGR_DECFIELDS_STR-SUBST_RECN sy-vline 
WA_EHPRCS_DECSUB_MIGR_DECFIELDS_STR-HOMOGMAT_RECN sy-vline 
WA_EHPRCS_DECSUB_MIGR_DECFIELDS_STR-HOMOGMAT_NAME sy-vline 
WA_EHPRCS_DECSUB_MIGR_DECFIELDS_STR-VALUE sy-vline 
WA_EHPRCS_DECSUB_MIGR_DECFIELDS_STR-VALUEMIN sy-vline 
WA_EHPRCS_DECSUB_MIGR_DECFIELDS_STR-VALUEMAX sy-vline 
WA_EHPRCS_DECSUB_MIGR_DECFIELDS_STR-VUNIT sy-vline 
WA_EHPRCS_DECSUB_MIGR_DECFIELDS_STR-WEIGHT sy-vline 
WA_EHPRCS_DECSUB_MIGR_DECFIELDS_STR-WUNIT sy-vline 
WA_EHPRCS_DECSUB_MIGR_DECFIELDS_STR-CONTAINED sy-vline 
WA_EHPRCS_DECSUB_MIGR_DECFIELDS_STR-REMARK sy-vline 
WA_EHPRCS_DECSUB_MIGR_DECFIELDS_STR-ORIGIN sy-vline 
WA_EHPRCS_DECSUB_MIGR_DECFIELDS_STR-EXEMPTION sy-vline 
WA_EHPRCS_DECSUB_MIGR_DECFIELDS_STR-CLASS sy-vline      INTO ld_text SEPARATED BY SPACE.

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