ABAP Select data from SAP table J_1ITAXVAR into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP J_1ITAXVAR 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_1ITAXVAR. 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_1ITAXVAR 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_1ITAXVAR TYPE STANDARD TABLE OF J_1ITAXVAR,
      WA_J_1ITAXVAR TYPE J_1ITAXVAR,
      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_1ITAXVAR> TYPE J_1ITAXVAR.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_J_1ITAXVAR.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM J_1ITAXVAR
  INTO TABLE IT_J_1ITAXVAR.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM J_1ITAXVAR
*  INTO TABLE @DATA(IT_J_1ITAXVAR2).
*--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_1ITAXVAR INDEX 1 INTO DATA(WA_J_1ITAXVAR2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_J_1ITAXVAR ASSIGNING <J_1ITAXVAR>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<J_1ITAXVAR>-J_1ITAXPC1 = 1.
<J_1ITAXVAR>-J_1ITAXAM1 = 1.
<J_1ITAXVAR>-J_1ITAXBS1 = 1.
<J_1ITAXVAR>-J_1ITAXPC2 = 1.
<J_1ITAXVAR>-J_1ITAXAM2 = 1.

ENDLOOP.

LOOP AT IT_J_1ITAXVAR INTO WA_J_1ITAXVAR.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_J_1ITAXVAR-J_1ITAXBS2, sy-vline,
  WA_J_1ITAXVAR-J_1ITAXPC3, sy-vline,
  WA_J_1ITAXVAR-J_1ITAXAM3, sy-vline,
  WA_J_1ITAXVAR-J_1ITAXBS3, sy-vline,
  WA_J_1ITAXVAR-J_1ITAXPC4, sy-vline,
  WA_J_1ITAXVAR-J_1ITAXAM4, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_J_1ITAXVAR 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_1ITAXVAR 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_1ITAXVAR INTO WA_J_1ITAXVAR.


*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_J_1ITAXVAR_STR, 
J_1ITAXPC1 TYPE STRING,
J_1ITAXAM1 TYPE STRING,
J_1ITAXBS1 TYPE STRING,
J_1ITAXPC2 TYPE STRING,
J_1ITAXAM2 TYPE STRING,
J_1ITAXBS2 TYPE STRING,
J_1ITAXPC3 TYPE STRING,
J_1ITAXAM3 TYPE STRING,
J_1ITAXBS3 TYPE STRING,
J_1ITAXPC4 TYPE STRING,
J_1ITAXAM4 TYPE STRING,
J_1ITAXBS4 TYPE STRING,
J_1ITAXPC5 TYPE STRING,
J_1ITAXAM5 TYPE STRING,
J_1ITAXBS5 TYPE STRING,
J_1ITAXPC6 TYPE STRING,
J_1ITAXAM6 TYPE STRING,
J_1ITAXBS6 TYPE STRING,
J_1ITAXPC7 TYPE STRING,
J_1ITAXAM7 TYPE STRING,
J_1ITAXBS7 TYPE STRING,
J_1ITAXPC8 TYPE STRING,
J_1ITAXAM8 TYPE STRING,
J_1ITAXBS8 TYPE STRING,
J_1ITAXPC9 TYPE STRING,
J_1ITAXAM9 TYPE STRING,
J_1ITAXBS9 TYPE STRING,
J_1ITAXPC0 TYPE STRING,
J_1ITAXAM0 TYPE STRING,
J_1ITAXBS0 TYPE STRING,
J_1ITAXPCA TYPE STRING,
J_1ITAXAMA TYPE STRING,
J_1ITAXBSA TYPE STRING,
J_1ITAXPCB TYPE STRING,
J_1ITAXAMB TYPE STRING,
J_1ITAXBSB TYPE STRING,
J_1ITAXPCC TYPE STRING,
J_1ITAXAMC TYPE STRING,
J_1ITAXBSC TYPE STRING,
J_1ITAXPCD TYPE STRING,
J_1ITAXAMD TYPE STRING,
J_1ITAXBSD TYPE STRING,
J_1ITAXPCE TYPE STRING,
J_1ITAXAME TYPE STRING,
J_1ITAXBSE TYPE STRING,
J_1ITAXPCF TYPE STRING,
J_1ITAXAMF TYPE STRING,
J_1ITAXBSF TYPE STRING,
J_1ITAXPCG1 TYPE STRING,
J_1ITAXAMG1 TYPE STRING,
J_1ITAXBSG1 TYPE STRING,
J_1ITAXPCH1 TYPE STRING,
J_1ITAXAMH1 TYPE STRING,
J_1ITAXBSH1 TYPE STRING,
J_1ITAXPCI1 TYPE STRING,
J_1ITAXAMI1 TYPE STRING,
J_1ITAXBSI1 TYPE STRING,
J_1ITAXPCG2 TYPE STRING,
J_1ITAXAMG2 TYPE STRING,
J_1ITAXBSG2 TYPE STRING,
J_1ITAXPCH2 TYPE STRING,
J_1ITAXAMH2 TYPE STRING,
J_1ITAXBSH2 TYPE STRING,
J_1ITAXPCI2 TYPE STRING,
J_1ITAXAMI2 TYPE STRING,
J_1ITAXBSI2 TYPE STRING,
J_1ITAXPCG3 TYPE STRING,
J_1ITAXAMG3 TYPE STRING,
J_1ITAXBSG3 TYPE STRING,
J_1ITAXPCH3 TYPE STRING,
J_1ITAXAMH3 TYPE STRING,
J_1ITAXBSH3 TYPE STRING,
J_1ITAXPCI3 TYPE STRING,
J_1ITAXAMI3 TYPE STRING,
J_1ITAXBSI3 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_J_1ITAXVAR_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_1ITAXVAR_STR-J_1ITAXPC1 sy-vline 
WA_J_1ITAXVAR_STR-J_1ITAXAM1 sy-vline 
WA_J_1ITAXVAR_STR-J_1ITAXBS1 sy-vline 
WA_J_1ITAXVAR_STR-J_1ITAXPC2 sy-vline 
WA_J_1ITAXVAR_STR-J_1ITAXAM2 sy-vline 
WA_J_1ITAXVAR_STR-J_1ITAXBS2 sy-vline 
WA_J_1ITAXVAR_STR-J_1ITAXPC3 sy-vline 
WA_J_1ITAXVAR_STR-J_1ITAXAM3 sy-vline 
WA_J_1ITAXVAR_STR-J_1ITAXBS3 sy-vline 
WA_J_1ITAXVAR_STR-J_1ITAXPC4 sy-vline 
WA_J_1ITAXVAR_STR-J_1ITAXAM4 sy-vline 
WA_J_1ITAXVAR_STR-J_1ITAXBS4 sy-vline 
WA_J_1ITAXVAR_STR-J_1ITAXPC5 sy-vline 
WA_J_1ITAXVAR_STR-J_1ITAXAM5 sy-vline 
WA_J_1ITAXVAR_STR-J_1ITAXBS5 sy-vline 
WA_J_1ITAXVAR_STR-J_1ITAXPC6 sy-vline 
WA_J_1ITAXVAR_STR-J_1ITAXAM6 sy-vline 
WA_J_1ITAXVAR_STR-J_1ITAXBS6 sy-vline 
WA_J_1ITAXVAR_STR-J_1ITAXPC7 sy-vline 
WA_J_1ITAXVAR_STR-J_1ITAXAM7 sy-vline 
WA_J_1ITAXVAR_STR-J_1ITAXBS7 sy-vline 
WA_J_1ITAXVAR_STR-J_1ITAXPC8 sy-vline 
WA_J_1ITAXVAR_STR-J_1ITAXAM8 sy-vline 
WA_J_1ITAXVAR_STR-J_1ITAXBS8 sy-vline 
WA_J_1ITAXVAR_STR-J_1ITAXPC9 sy-vline 
WA_J_1ITAXVAR_STR-J_1ITAXAM9 sy-vline 
WA_J_1ITAXVAR_STR-J_1ITAXBS9 sy-vline 
WA_J_1ITAXVAR_STR-J_1ITAXPC0 sy-vline 
WA_J_1ITAXVAR_STR-J_1ITAXAM0 sy-vline 
WA_J_1ITAXVAR_STR-J_1ITAXBS0 sy-vline 
WA_J_1ITAXVAR_STR-J_1ITAXPCA sy-vline 
WA_J_1ITAXVAR_STR-J_1ITAXAMA sy-vline 
WA_J_1ITAXVAR_STR-J_1ITAXBSA sy-vline 
WA_J_1ITAXVAR_STR-J_1ITAXPCB sy-vline 
WA_J_1ITAXVAR_STR-J_1ITAXAMB sy-vline 
WA_J_1ITAXVAR_STR-J_1ITAXBSB sy-vline 
WA_J_1ITAXVAR_STR-J_1ITAXPCC sy-vline 
WA_J_1ITAXVAR_STR-J_1ITAXAMC sy-vline 
WA_J_1ITAXVAR_STR-J_1ITAXBSC sy-vline 
WA_J_1ITAXVAR_STR-J_1ITAXPCD sy-vline 
WA_J_1ITAXVAR_STR-J_1ITAXAMD sy-vline 
WA_J_1ITAXVAR_STR-J_1ITAXBSD sy-vline 
WA_J_1ITAXVAR_STR-J_1ITAXPCE sy-vline 
WA_J_1ITAXVAR_STR-J_1ITAXAME sy-vline 
WA_J_1ITAXVAR_STR-J_1ITAXBSE sy-vline 
WA_J_1ITAXVAR_STR-J_1ITAXPCF sy-vline 
WA_J_1ITAXVAR_STR-J_1ITAXAMF sy-vline 
WA_J_1ITAXVAR_STR-J_1ITAXBSF sy-vline 
WA_J_1ITAXVAR_STR-J_1ITAXPCG1 sy-vline 
WA_J_1ITAXVAR_STR-J_1ITAXAMG1 sy-vline 
WA_J_1ITAXVAR_STR-J_1ITAXBSG1 sy-vline 
WA_J_1ITAXVAR_STR-J_1ITAXPCH1 sy-vline 
WA_J_1ITAXVAR_STR-J_1ITAXAMH1 sy-vline 
WA_J_1ITAXVAR_STR-J_1ITAXBSH1 sy-vline 
WA_J_1ITAXVAR_STR-J_1ITAXPCI1 sy-vline 
WA_J_1ITAXVAR_STR-J_1ITAXAMI1 sy-vline 
WA_J_1ITAXVAR_STR-J_1ITAXBSI1 sy-vline 
WA_J_1ITAXVAR_STR-J_1ITAXPCG2 sy-vline 
WA_J_1ITAXVAR_STR-J_1ITAXAMG2 sy-vline 
WA_J_1ITAXVAR_STR-J_1ITAXBSG2 sy-vline 
WA_J_1ITAXVAR_STR-J_1ITAXPCH2 sy-vline 
WA_J_1ITAXVAR_STR-J_1ITAXAMH2 sy-vline 
WA_J_1ITAXVAR_STR-J_1ITAXBSH2 sy-vline 
WA_J_1ITAXVAR_STR-J_1ITAXPCI2 sy-vline 
WA_J_1ITAXVAR_STR-J_1ITAXAMI2 sy-vline 
WA_J_1ITAXVAR_STR-J_1ITAXBSI2 sy-vline 
WA_J_1ITAXVAR_STR-J_1ITAXPCG3 sy-vline 
WA_J_1ITAXVAR_STR-J_1ITAXAMG3 sy-vline 
WA_J_1ITAXVAR_STR-J_1ITAXBSG3 sy-vline 
WA_J_1ITAXVAR_STR-J_1ITAXPCH3 sy-vline 
WA_J_1ITAXVAR_STR-J_1ITAXAMH3 sy-vline 
WA_J_1ITAXVAR_STR-J_1ITAXBSH3 sy-vline 
WA_J_1ITAXVAR_STR-J_1ITAXPCI3 sy-vline 
WA_J_1ITAXVAR_STR-J_1ITAXAMI3 sy-vline 
WA_J_1ITAXVAR_STR-J_1ITAXBSI3 sy-vline      INTO ld_text SEPARATED BY SPACE.

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