ABAP Select data from SAP table EXTAX_PERSISTENT into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM EXTAX_PERSISTENT
*  INTO TABLE @DATA(IT_EXTAX_PERSISTENT2).
*--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_EXTAX_PERSISTENT INDEX 1 INTO DATA(WA_EXTAX_PERSISTENT2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<EXTAX_PERSISTENT>-ITEMS = 1.
<EXTAX_PERSISTENT>-HEADER = 1.
<EXTAX_PERSISTENT>-DOCNR = 1.
<EXTAX_PERSISTENT>-REF_DOC_KEY = 1.
<EXTAX_PERSISTENT>-AWTYP = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_EXTAX_PERSISTENT-AWREF, sy-vline,
  WA_EXTAX_PERSISTENT-AWORG, sy-vline,
  WA_EXTAX_PERSISTENT-AWSYS, sy-vline,
  WA_EXTAX_PERSISTENT-DOCSTATUS_INFO, sy-vline,
  WA_EXTAX_PERSISTENT-DOCSTATUS, sy-vline,
  WA_EXTAX_PERSISTENT-DOCSTATUSCHANGED, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_EXTAX_PERSISTENT 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_EXTAX_PERSISTENT 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_EXTAX_PERSISTENT INTO WA_EXTAX_PERSISTENT.


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

*Conversion exit ALPHA, internal->external for field AWSYS
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_EXTAX_PERSISTENT-AWSYS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_EXTAX_PERSISTENT-AWSYS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field SYST_NAME
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_EXTAX_PERSISTENT-SYST_NAME
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_EXTAX_PERSISTENT-SYST_NAME.
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_EXTAX_PERSISTENT_STR, 
ITEMS TYPE STRING,
HEADER TYPE STRING,
DOCNR TYPE STRING,
REF_DOC_KEY TYPE STRING,
AWTYP TYPE STRING,
AWREF TYPE STRING,
AWORG TYPE STRING,
AWSYS TYPE STRING,
DOCSTATUS_INFO TYPE STRING,
DOCSTATUS TYPE STRING,
DOCSTATUSCHANGED TYPE STRING,
UPDATE_INFO TYPE STRING,
CREATEDON TYPE STRING,
CREATEDBY TYPE STRING,
TID TYPE STRING,
GLTAX TYPE STRING,
TXDEF TYPE STRING,
DEFAULT_REASON TYPE STRING,
INCON TYPE STRING,
EXCON TYPE STRING,
UFLAG TYPE STRING,
UDATE TYPE STRING,
USNAM TYPE STRING,
HEADER_INFO TYPE STRING,
SYST_NAME TYPE STRING,
CLIENT TYPE STRING,
COMP_CODE TYPE STRING,
DOC_NUMBER TYPE STRING,
CURRENCY TYPE STRING,
CURR_DEC TYPE STRING,
TXJCD_L1 TYPE STRING,
TXJCD_L2 TYPE STRING,
TXJCD_L3 TYPE STRING,
TXJCD_L4 TYPE STRING,
TAX_PER_ITEM TYPE STRING,
NR_LINE_ITEMS TYPE STRING,
IS_UJCS_ACTIVE TYPE STRING,
API_VERSION TYPE STRING,
GL_CURRENCY TYPE STRING,
GL_CURR_DEC TYPE STRING,
REP_DATE TYPE STRING,
RATEDEC TYPE STRING,
XEXTN TYPE STRING,
INTERF_VERSION TYPE STRING,
TAX_PROCEDURE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_EXTAX_PERSISTENT_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_EXTAX_PERSISTENT_STR-ITEMS sy-vline 
WA_EXTAX_PERSISTENT_STR-HEADER sy-vline 
WA_EXTAX_PERSISTENT_STR-DOCNR sy-vline 
WA_EXTAX_PERSISTENT_STR-REF_DOC_KEY sy-vline 
WA_EXTAX_PERSISTENT_STR-AWTYP sy-vline 
WA_EXTAX_PERSISTENT_STR-AWREF sy-vline 
WA_EXTAX_PERSISTENT_STR-AWORG sy-vline 
WA_EXTAX_PERSISTENT_STR-AWSYS sy-vline 
WA_EXTAX_PERSISTENT_STR-DOCSTATUS_INFO sy-vline 
WA_EXTAX_PERSISTENT_STR-DOCSTATUS sy-vline 
WA_EXTAX_PERSISTENT_STR-DOCSTATUSCHANGED sy-vline 
WA_EXTAX_PERSISTENT_STR-UPDATE_INFO sy-vline 
WA_EXTAX_PERSISTENT_STR-CREATEDON sy-vline 
WA_EXTAX_PERSISTENT_STR-CREATEDBY sy-vline 
WA_EXTAX_PERSISTENT_STR-TID sy-vline 
WA_EXTAX_PERSISTENT_STR-GLTAX sy-vline 
WA_EXTAX_PERSISTENT_STR-TXDEF sy-vline 
WA_EXTAX_PERSISTENT_STR-DEFAULT_REASON sy-vline 
WA_EXTAX_PERSISTENT_STR-INCON sy-vline 
WA_EXTAX_PERSISTENT_STR-EXCON sy-vline 
WA_EXTAX_PERSISTENT_STR-UFLAG sy-vline 
WA_EXTAX_PERSISTENT_STR-UDATE sy-vline 
WA_EXTAX_PERSISTENT_STR-USNAM sy-vline 
WA_EXTAX_PERSISTENT_STR-HEADER_INFO sy-vline 
WA_EXTAX_PERSISTENT_STR-SYST_NAME sy-vline 
WA_EXTAX_PERSISTENT_STR-CLIENT sy-vline 
WA_EXTAX_PERSISTENT_STR-COMP_CODE sy-vline 
WA_EXTAX_PERSISTENT_STR-DOC_NUMBER sy-vline 
WA_EXTAX_PERSISTENT_STR-CURRENCY sy-vline 
WA_EXTAX_PERSISTENT_STR-CURR_DEC sy-vline 
WA_EXTAX_PERSISTENT_STR-TXJCD_L1 sy-vline 
WA_EXTAX_PERSISTENT_STR-TXJCD_L2 sy-vline 
WA_EXTAX_PERSISTENT_STR-TXJCD_L3 sy-vline 
WA_EXTAX_PERSISTENT_STR-TXJCD_L4 sy-vline 
WA_EXTAX_PERSISTENT_STR-TAX_PER_ITEM sy-vline 
WA_EXTAX_PERSISTENT_STR-NR_LINE_ITEMS sy-vline 
WA_EXTAX_PERSISTENT_STR-IS_UJCS_ACTIVE sy-vline 
WA_EXTAX_PERSISTENT_STR-API_VERSION sy-vline 
WA_EXTAX_PERSISTENT_STR-GL_CURRENCY sy-vline 
WA_EXTAX_PERSISTENT_STR-GL_CURR_DEC sy-vline 
WA_EXTAX_PERSISTENT_STR-REP_DATE sy-vline 
WA_EXTAX_PERSISTENT_STR-RATEDEC sy-vline 
WA_EXTAX_PERSISTENT_STR-XEXTN sy-vline 
WA_EXTAX_PERSISTENT_STR-INTERF_VERSION sy-vline 
WA_EXTAX_PERSISTENT_STR-TAX_PROCEDURE sy-vline      INTO ld_text SEPARATED BY SPACE.

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