ABAP Select data from SAP table PCHNGDUI into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PCHNGDUI
*  INTO TABLE @DATA(IT_PCHNGDUI2).
*--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_PCHNGDUI INDEX 1 INTO DATA(WA_PCHNGDUI2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PCHNGDUI>-MANDT = 1.
<PCHNGDUI>-OBJECTCLASS = 1.
<PCHNGDUI>-OBJECTID = 1.
<PCHNGDUI>-CHANGENUMBER = 1.
<PCHNGDUI>-TABLEKEY = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PCHNGDUI-FIELDNAME, sy-vline,
  WA_PCHNGDUI-DATEOFUPDATE, sy-vline,
  WA_PCHNGDUI-COMPANYCODE, sy-vline,
  WA_PCHNGDUI-ACCOUNTINGDOCUMENT, sy-vline,
  WA_PCHNGDUI-FISCALYEAR, sy-vline,
  WA_PCHNGDUI-ACCOUNTINGDOCUMENTITEM, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PCHNGDUI 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_PCHNGDUI 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_PCHNGDUI INTO WA_PCHNGDUI.


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

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

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

*Conversion exit GJAHR, internal->external for field FISCALYEAR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_PCHNGDUI-FISCALYEAR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PCHNGDUI-FISCALYEAR.
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_PCHNGDUI_STR, 
MANDT TYPE STRING,
OBJECTCLASS TYPE STRING,
OBJECTID TYPE STRING,
CHANGENUMBER TYPE STRING,
TABLEKEY TYPE STRING,
FIELDNAME TYPE STRING,
DATEOFUPDATE TYPE STRING,
COMPANYCODE TYPE STRING,
ACCOUNTINGDOCUMENT TYPE STRING,
FISCALYEAR TYPE STRING,
ACCOUNTINGDOCUMENTITEM TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PCHNGDUI_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_PCHNGDUI_STR-MANDT sy-vline 
WA_PCHNGDUI_STR-OBJECTCLASS sy-vline 
WA_PCHNGDUI_STR-OBJECTID sy-vline 
WA_PCHNGDUI_STR-CHANGENUMBER sy-vline 
WA_PCHNGDUI_STR-TABLEKEY sy-vline 
WA_PCHNGDUI_STR-FIELDNAME sy-vline 
WA_PCHNGDUI_STR-DATEOFUPDATE sy-vline 
WA_PCHNGDUI_STR-COMPANYCODE sy-vline 
WA_PCHNGDUI_STR-ACCOUNTINGDOCUMENT sy-vline 
WA_PCHNGDUI_STR-FISCALYEAR sy-vline 
WA_PCHNGDUI_STR-ACCOUNTINGDOCUMENTITEM sy-vline      INTO ld_text SEPARATED BY SPACE.

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