ABAP Select data from SAP table GST_IN_ACCOUNTING_DOCUMENT into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM GST_IN_ACCOUNTING_DOCUMENT
*  INTO TABLE @DATA(IT_GST_IN_ACCOUNTING_DOCUMENT2).
*--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_GST_IN_ACCOUNTING_DOCUMENT INDEX 1 INTO DATA(WA_GST_IN_ACCOUNTING_DOCUMENT2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<GST_IN_ACCOUNTING_DOCUMENT>-COMPANYCODE = 1.
<GST_IN_ACCOUNTING_DOCUMENT>-ACCOUNTINGDOCUMENT = 1.
<GST_IN_ACCOUNTING_DOCUMENT>-FISCALYEAR = 1.
<GST_IN_ACCOUNTING_DOCUMENT>-ACCOUNTINGDOCUMENTTYPE = 1.
<GST_IN_ACCOUNTING_DOCUMENT>-DOCUMENTDATE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_GST_IN_ACCOUNTING_DOCUMENT-POSTINGDATE, sy-vline,
  WA_GST_IN_ACCOUNTING_DOCUMENT-FISCALPERIOD, sy-vline,
  WA_GST_IN_ACCOUNTING_DOCUMENT-ACCOUNTINGDOCUMENTCREATIONDATE, sy-vline,
  WA_GST_IN_ACCOUNTING_DOCUMENT-TRANSACTIONCODE, sy-vline,
  WA_GST_IN_ACCOUNTING_DOCUMENT-ACCOUNTINGDOCUMENTHEADERTEXT, sy-vline,
  WA_GST_IN_ACCOUNTING_DOCUMENT-CURRENCY, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_GST_IN_ACCOUNTING_DOCUMENT 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_GST_IN_ACCOUNTING_DOCUMENT 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_GST_IN_ACCOUNTING_DOCUMENT INTO WA_GST_IN_ACCOUNTING_DOCUMENT.


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

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

*Conversion exit EXCRT, internal->external for field EXCHANGERATE
CALL FUNCTION 'CONVERSION_EXIT_EXCRT_OUTPUT'
  EXPORTING
    input =                      WA_GST_IN_ACCOUNTING_DOCUMENT-EXCHANGERATE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_GST_IN_ACCOUNTING_DOCUMENT-EXCHANGERATE.
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_GST_IN_ACCOUNTING_DOCUMENT_STR, 
COMPANYCODE TYPE STRING,
ACCOUNTINGDOCUMENT TYPE STRING,
FISCALYEAR TYPE STRING,
ACCOUNTINGDOCUMENTTYPE TYPE STRING,
DOCUMENTDATE TYPE STRING,
POSTINGDATE TYPE STRING,
FISCALPERIOD TYPE STRING,
ACCOUNTINGDOCUMENTCREATIONDATE TYPE STRING,
TRANSACTIONCODE TYPE STRING,
ACCOUNTINGDOCUMENTHEADERTEXT TYPE STRING,
CURRENCY TYPE STRING,
EXCHANGERATE TYPE STRING,
REFERENCEDOCUMENTTYPE TYPE STRING,
ORIGINALREFERENCEDOCUMENT TYPE STRING,
BRANCH TYPE STRING,
TAXREPORTINGDATE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_GST_IN_ACCOUNTING_DOCUMENT_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_GST_IN_ACCOUNTING_DOCUMENT_STR-COMPANYCODE sy-vline 
WA_GST_IN_ACCOUNTING_DOCUMENT_STR-ACCOUNTINGDOCUMENT sy-vline 
WA_GST_IN_ACCOUNTING_DOCUMENT_STR-FISCALYEAR sy-vline 
WA_GST_IN_ACCOUNTING_DOCUMENT_STR-ACCOUNTINGDOCUMENTTYPE sy-vline 
WA_GST_IN_ACCOUNTING_DOCUMENT_STR-DOCUMENTDATE sy-vline 
WA_GST_IN_ACCOUNTING_DOCUMENT_STR-POSTINGDATE sy-vline 
WA_GST_IN_ACCOUNTING_DOCUMENT_STR-FISCALPERIOD sy-vline 
WA_GST_IN_ACCOUNTING_DOCUMENT_STR-ACCOUNTINGDOCUMENTCREATIONDATE sy-vline 
WA_GST_IN_ACCOUNTING_DOCUMENT_STR-TRANSACTIONCODE sy-vline 
WA_GST_IN_ACCOUNTING_DOCUMENT_STR-ACCOUNTINGDOCUMENTHEADERTEXT sy-vline 
WA_GST_IN_ACCOUNTING_DOCUMENT_STR-CURRENCY sy-vline 
WA_GST_IN_ACCOUNTING_DOCUMENT_STR-EXCHANGERATE sy-vline 
WA_GST_IN_ACCOUNTING_DOCUMENT_STR-REFERENCEDOCUMENTTYPE sy-vline 
WA_GST_IN_ACCOUNTING_DOCUMENT_STR-ORIGINALREFERENCEDOCUMENT sy-vline 
WA_GST_IN_ACCOUNTING_DOCUMENT_STR-BRANCH sy-vline 
WA_GST_IN_ACCOUNTING_DOCUMENT_STR-TAXREPORTINGDATE sy-vline      INTO ld_text SEPARATED BY SPACE.

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