ABAP Select data from SAP table J_3RFTAX_OBJSEL into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP J_3RFTAX_OBJSEL 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 J_3RFTAX_OBJSEL. 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 J_3RFTAX_OBJSEL 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_J_3RFTAX_OBJSEL TYPE STANDARD TABLE OF J_3RFTAX_OBJSEL,
      WA_J_3RFTAX_OBJSEL TYPE J_3RFTAX_OBJSEL,
      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: <J_3RFTAX_OBJSEL> TYPE J_3RFTAX_OBJSEL.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_J_3RFTAX_OBJSEL.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM J_3RFTAX_OBJSEL
  INTO TABLE IT_J_3RFTAX_OBJSEL.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM J_3RFTAX_OBJSEL
*  INTO TABLE @DATA(IT_J_3RFTAX_OBJSEL2).
*--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_J_3RFTAX_OBJSEL INDEX 1 INTO DATA(WA_J_3RFTAX_OBJSEL2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_J_3RFTAX_OBJSEL ASSIGNING <J_3RFTAX_OBJSEL>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<J_3RFTAX_OBJSEL>-MANDT = 1.
<J_3RFTAX_OBJSEL>-HIER_KEY = 1.
<J_3RFTAX_OBJSEL>-NODE_CODE = 1.
<J_3RFTAX_OBJSEL>-LINENUM = 1.
<J_3RFTAX_OBJSEL>-SEQNR = 1.

ENDLOOP.

LOOP AT IT_J_3RFTAX_OBJSEL INTO WA_J_3RFTAX_OBJSEL.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_J_3RFTAX_OBJSEL-ACTTYPE, sy-vline,
  WA_J_3RFTAX_OBJSEL-ACTIVITY, sy-vline,
  WA_J_3RFTAX_OBJSEL-SIGN, sy-vline,
  WA_J_3RFTAX_OBJSEL-TABNAME, sy-vline,
  WA_J_3RFTAX_OBJSEL-FIELDNAME, sy-vline,
  WA_J_3RFTAX_OBJSEL-DEBIT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_J_3RFTAX_OBJSEL 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_J_3RFTAX_OBJSEL 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_J_3RFTAX_OBJSEL INTO WA_J_3RFTAX_OBJSEL.


*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 GJAHR, internal->external for field GJAHR_LOW
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_J_3RFTAX_OBJSEL-GJAHR_LOW
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_J_3RFTAX_OBJSEL-GJAHR_LOW.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GJAHR, internal->external for field GJAHR_HIGH
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_J_3RFTAX_OBJSEL-GJAHR_HIGH
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_J_3RFTAX_OBJSEL-GJAHR_HIGH.
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_J_3RFTAX_OBJSEL_STR, 
MANDT TYPE STRING,
HIER_KEY TYPE STRING,
NODE_CODE TYPE STRING,
LINENUM TYPE STRING,
SEQNR TYPE STRING,
ACTTYPE TYPE STRING,
ACTIVITY TYPE STRING,
SIGN TYPE STRING,
TABNAME TYPE STRING,
FIELDNAME TYPE STRING,
DEBIT TYPE STRING,
CREDIT TYPE STRING,
SOPTION TYPE STRING,
LOW TYPE STRING,
HIGH TYPE STRING,
RULE_ID TYPE STRING,
GJAHR_LOW TYPE STRING,
PERIOD_LOW TYPE STRING,
GJAHR_HIGH TYPE STRING,
PERIOD_HIGH TYPE STRING,END OF T_EKKO_STR.
DATA: WA_J_3RFTAX_OBJSEL_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_J_3RFTAX_OBJSEL_STR-MANDT sy-vline 
WA_J_3RFTAX_OBJSEL_STR-HIER_KEY sy-vline 
WA_J_3RFTAX_OBJSEL_STR-NODE_CODE sy-vline 
WA_J_3RFTAX_OBJSEL_STR-LINENUM sy-vline 
WA_J_3RFTAX_OBJSEL_STR-SEQNR sy-vline 
WA_J_3RFTAX_OBJSEL_STR-ACTTYPE sy-vline 
WA_J_3RFTAX_OBJSEL_STR-ACTIVITY sy-vline 
WA_J_3RFTAX_OBJSEL_STR-SIGN sy-vline 
WA_J_3RFTAX_OBJSEL_STR-TABNAME sy-vline 
WA_J_3RFTAX_OBJSEL_STR-FIELDNAME sy-vline 
WA_J_3RFTAX_OBJSEL_STR-DEBIT sy-vline 
WA_J_3RFTAX_OBJSEL_STR-CREDIT sy-vline 
WA_J_3RFTAX_OBJSEL_STR-SOPTION sy-vline 
WA_J_3RFTAX_OBJSEL_STR-LOW sy-vline 
WA_J_3RFTAX_OBJSEL_STR-HIGH sy-vline 
WA_J_3RFTAX_OBJSEL_STR-RULE_ID sy-vline 
WA_J_3RFTAX_OBJSEL_STR-GJAHR_LOW sy-vline 
WA_J_3RFTAX_OBJSEL_STR-PERIOD_LOW sy-vline 
WA_J_3RFTAX_OBJSEL_STR-GJAHR_HIGH sy-vline 
WA_J_3RFTAX_OBJSEL_STR-PERIOD_HIGH sy-vline      INTO ld_text SEPARATED BY SPACE.

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