ABAP Select data from SAP table J_1IG_AT into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP J_1IG_AT 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_1IG_AT. 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_1IG_AT 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_1IG_AT TYPE STANDARD TABLE OF J_1IG_AT,
      WA_J_1IG_AT TYPE J_1IG_AT,
      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_1IG_AT> TYPE J_1IG_AT.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_J_1IG_AT.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM J_1IG_AT
  INTO TABLE IT_J_1IG_AT.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM J_1IG_AT
*  INTO TABLE @DATA(IT_J_1IG_AT2).
*--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_1IG_AT INDEX 1 INTO DATA(WA_J_1IG_AT2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_J_1IG_AT ASSIGNING <J_1IG_AT>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<J_1IG_AT>-GSTIN = 1.
<J_1IG_AT>-INVNUM = 1.
<J_1IG_AT>-CTIN = 1.
<J_1IG_AT>-FP = 1.
<J_1IG_AT>-POS = 1.

ENDLOOP.

LOOP AT IT_J_1IG_AT INTO WA_J_1IG_AT.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_J_1IG_AT-RCVRSTATE, sy-vline,
  WA_J_1IG_AT-NRPREFIX, sy-vline,
  WA_J_1IG_AT-NRNUMBER, sy-vline,
  WA_J_1IG_AT-NRSUFFIX, sy-vline,
  WA_J_1IG_AT-INVAMT, sy-vline,
  WA_J_1IG_AT-INVDATE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_J_1IG_AT 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_1IG_AT 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_1IG_AT INTO WA_J_1IG_AT.


*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_1IG_AT_STR, 
GSTIN TYPE STRING,
INVNUM TYPE STRING,
CTIN TYPE STRING,
FP TYPE STRING,
POS TYPE STRING,
RCVRSTATE TYPE STRING,
NRPREFIX TYPE STRING,
NRNUMBER TYPE STRING,
NRSUFFIX TYPE STRING,
INVAMT TYPE STRING,
INVDATE TYPE STRING,
CNAME TYPE STRING,
NUM TYPE STRING,
TYPE TYPE STRING,
HSNSAC TYPE STRING,
DESCRIPTION TYPE STRING,
QUANTITY TYPE STRING,
UQC TYPE STRING,
TAXBASE TYPE STRING,
IGSTRATE TYPE STRING,
IGSTAMT TYPE STRING,
CGSTRATE TYPE STRING,
CGSTAMT TYPE STRING,
SGSTRATE TYPE STRING,
SGSTAMT TYPE STRING,
CESSRATE TYPE STRING,
CESSAMT TYPE STRING,
NILTYPE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_J_1IG_AT_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_1IG_AT_STR-GSTIN sy-vline 
WA_J_1IG_AT_STR-INVNUM sy-vline 
WA_J_1IG_AT_STR-CTIN sy-vline 
WA_J_1IG_AT_STR-FP sy-vline 
WA_J_1IG_AT_STR-POS sy-vline 
WA_J_1IG_AT_STR-RCVRSTATE sy-vline 
WA_J_1IG_AT_STR-NRPREFIX sy-vline 
WA_J_1IG_AT_STR-NRNUMBER sy-vline 
WA_J_1IG_AT_STR-NRSUFFIX sy-vline 
WA_J_1IG_AT_STR-INVAMT sy-vline 
WA_J_1IG_AT_STR-INVDATE sy-vline 
WA_J_1IG_AT_STR-CNAME sy-vline 
WA_J_1IG_AT_STR-NUM sy-vline 
WA_J_1IG_AT_STR-TYPE sy-vline 
WA_J_1IG_AT_STR-HSNSAC sy-vline 
WA_J_1IG_AT_STR-DESCRIPTION sy-vline 
WA_J_1IG_AT_STR-QUANTITY sy-vline 
WA_J_1IG_AT_STR-UQC sy-vline 
WA_J_1IG_AT_STR-TAXBASE sy-vline 
WA_J_1IG_AT_STR-IGSTRATE sy-vline 
WA_J_1IG_AT_STR-IGSTAMT sy-vline 
WA_J_1IG_AT_STR-CGSTRATE sy-vline 
WA_J_1IG_AT_STR-CGSTAMT sy-vline 
WA_J_1IG_AT_STR-SGSTRATE sy-vline 
WA_J_1IG_AT_STR-SGSTAMT sy-vline 
WA_J_1IG_AT_STR-CESSRATE sy-vline 
WA_J_1IG_AT_STR-CESSAMT sy-vline 
WA_J_1IG_AT_STR-NILTYPE sy-vline      INTO ld_text SEPARATED BY SPACE.

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