ABAP Select data from SAP table IREALSUBSTANCE into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM IREALSUBSTANCE
*  INTO TABLE @DATA(IT_IREALSUBSTANCE2).
*--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_IREALSUBSTANCE INDEX 1 INTO DATA(WA_IREALSUBSTANCE2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<IREALSUBSTANCE>-MANDT = 1.
<IREALSUBSTANCE>-REALSUBSTANCEINTERNALID = 1.
<IREALSUBSTANCE>-REALSUBSTANCE = 1.
<IREALSUBSTANCE>-REALSUBSTANCECREATIONDATE = 1.
<IREALSUBSTANCE>-REALSUBSTANCECREATEDBYUSER = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_IREALSUBSTANCE-REALSUBSTANCECHANGEDATE, sy-vline,
  WA_IREALSUBSTANCE-REALSUBSTANCECHANGEDBYUSER, sy-vline,
  WA_IREALSUBSTANCE-REALSUBSTANCEAUTHZNGROUP, sy-vline,
  WA_IREALSUBSTANCE-REALSUBSTANCETYPE, sy-vline,
  WA_IREALSUBSTANCE-SPECIFICATIONNOTE, sy-vline,
  WA_IREALSUBSTANCE-SPECIFICATIONVALIDITYSTARTDATE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_IREALSUBSTANCE 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_IREALSUBSTANCE 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_IREALSUBSTANCE INTO WA_IREALSUBSTANCE.


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

*Conversion exit ALPHA, internal->external for field SPECIFICATIONCHANGENUMBER
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_IREALSUBSTANCE-SPECIFICATIONCHANGENUMBER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IREALSUBSTANCE-SPECIFICATIONCHANGENUMBER.
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_IREALSUBSTANCE_STR, 
MANDT TYPE STRING,
REALSUBSTANCEINTERNALID TYPE STRING,
REALSUBSTANCE TYPE STRING,
REALSUBSTANCECREATIONDATE TYPE STRING,
REALSUBSTANCECREATEDBYUSER TYPE STRING,
REALSUBSTANCECHANGEDATE TYPE STRING,
REALSUBSTANCECHANGEDBYUSER TYPE STRING,
REALSUBSTANCEAUTHZNGROUP TYPE STRING,
REALSUBSTANCETYPE TYPE STRING,
SPECIFICATIONNOTE TYPE STRING,
SPECIFICATIONVALIDITYSTARTDATE TYPE STRING,
SPECIFICATIONVALIDITYENDDATE TYPE STRING,
SPECIFICATIONSUBSTANCENATR TYPE STRING,
SPECIFICATIONCHANGENUMBER TYPE STRING,
SPECIFICATIONCATEGORY TYPE STRING,END OF T_EKKO_STR.
DATA: WA_IREALSUBSTANCE_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_IREALSUBSTANCE_STR-MANDT sy-vline 
WA_IREALSUBSTANCE_STR-REALSUBSTANCEINTERNALID sy-vline 
WA_IREALSUBSTANCE_STR-REALSUBSTANCE sy-vline 
WA_IREALSUBSTANCE_STR-REALSUBSTANCECREATIONDATE sy-vline 
WA_IREALSUBSTANCE_STR-REALSUBSTANCECREATEDBYUSER sy-vline 
WA_IREALSUBSTANCE_STR-REALSUBSTANCECHANGEDATE sy-vline 
WA_IREALSUBSTANCE_STR-REALSUBSTANCECHANGEDBYUSER sy-vline 
WA_IREALSUBSTANCE_STR-REALSUBSTANCEAUTHZNGROUP sy-vline 
WA_IREALSUBSTANCE_STR-REALSUBSTANCETYPE sy-vline 
WA_IREALSUBSTANCE_STR-SPECIFICATIONNOTE sy-vline 
WA_IREALSUBSTANCE_STR-SPECIFICATIONVALIDITYSTARTDATE sy-vline 
WA_IREALSUBSTANCE_STR-SPECIFICATIONVALIDITYENDDATE sy-vline 
WA_IREALSUBSTANCE_STR-SPECIFICATIONSUBSTANCENATR sy-vline 
WA_IREALSUBSTANCE_STR-SPECIFICATIONCHANGENUMBER sy-vline 
WA_IREALSUBSTANCE_STR-SPECIFICATIONCATEGORY sy-vline      INTO ld_text SEPARATED BY SPACE.

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