ABAP Select data from SAP table RDGCHANGE into internal table

Get Example source ABAP code based on a different SAP table
  Get ABAP code

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RDGCHANGE
*  INTO TABLE @DATA(IT_RDGCHANGE2).
*--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_RDGCHANGE INDEX 1 INTO DATA(WA_RDGCHANGE2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RDGCHANGE>-VBELN = 1.
<RDGCHANGE>-POSNR = 1.
<RDGCHANGE>-UPOSNR = 1.
<RDGCHANGE>-MATNR = 1.
<RDGCHANGE>-MATNR_CHG = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RDGCHANGE-PR_MAT_CHG, sy-vline,
  WA_RDGCHANGE-FLG_CHG, sy-vline,
  WA_RDGCHANGE-DGNTGEW_CHG, sy-vline,
  WA_RDGCHANGE-DGBRGEW_CHG, sy-vline,
  WA_RDGCHANGE-DGGEWEI_CHG, sy-vline,
  WA_RDGCHANGE-MATNR_DISLV, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RDGCHANGE 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_RDGCHANGE 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_RDGCHANGE INTO WA_RDGCHANGE.


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

*Conversion exit MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_RDGCHANGE-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RDGCHANGE-MATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field MATNR_CHG
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_RDGCHANGE-MATNR_CHG
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RDGCHANGE-MATNR_CHG.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field DGGEWEI_CHG
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_RDGCHANGE-DGGEWEI_CHG
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RDGCHANGE-DGGEWEI_CHG.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field MATNR_DISLV
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_RDGCHANGE-MATNR_DISLV
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RDGCHANGE-MATNR_DISLV.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field DGGEWEI_DISLV
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_RDGCHANGE-DGGEWEI_DISLV
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RDGCHANGE-DGGEWEI_DISLV.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit MATN1, internal->external for field MATNR_PACK
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_RDGCHANGE-MATNR_PACK
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RDGCHANGE-MATNR_PACK.
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_RDGCHANGE_STR, 
VBELN TYPE STRING,
POSNR TYPE STRING,
UPOSNR TYPE STRING,
MATNR TYPE STRING,
MATNR_CHG TYPE STRING,
PR_MAT_CHG TYPE STRING,
FLG_CHG TYPE STRING,
DGNTGEW_CHG TYPE STRING,
DGBRGEW_CHG TYPE STRING,
DGGEWEI_CHG TYPE STRING,
MATNR_DISLV TYPE STRING,
PR_MAT_DISLV TYPE STRING,
FLG_DISLV TYPE STRING,
DGNTGEW_DISLV TYPE STRING,
DGBRGEW_DISLV TYPE STRING,
DGGEWEI_DISLV TYPE STRING,
VENUM TYPE STRING,
VEPOS TYPE STRING,
PACOD TYPE STRING,
MATNR_PACK TYPE STRING,
FLG_DAM_MAT TYPE STRING,
MSGTY TYPE STRING,
MSGID TYPE STRING,
MSGNO TYPE STRING,
MSGV1 TYPE STRING,
MSGV2 TYPE STRING,
MSGV3 TYPE STRING,
MSGV4 TYPE STRING,
ALTEXT TYPE STRING,
USEREXITP TYPE STRING,
USEREXITF TYPE STRING,
DETLEVEL TYPE STRING,
PROBCLASS TYPE STRING,
ALSORT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RDGCHANGE_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_RDGCHANGE_STR-VBELN sy-vline 
WA_RDGCHANGE_STR-POSNR sy-vline 
WA_RDGCHANGE_STR-UPOSNR sy-vline 
WA_RDGCHANGE_STR-MATNR sy-vline 
WA_RDGCHANGE_STR-MATNR_CHG sy-vline 
WA_RDGCHANGE_STR-PR_MAT_CHG sy-vline 
WA_RDGCHANGE_STR-FLG_CHG sy-vline 
WA_RDGCHANGE_STR-DGNTGEW_CHG sy-vline 
WA_RDGCHANGE_STR-DGBRGEW_CHG sy-vline 
WA_RDGCHANGE_STR-DGGEWEI_CHG sy-vline 
WA_RDGCHANGE_STR-MATNR_DISLV sy-vline 
WA_RDGCHANGE_STR-PR_MAT_DISLV sy-vline 
WA_RDGCHANGE_STR-FLG_DISLV sy-vline 
WA_RDGCHANGE_STR-DGNTGEW_DISLV sy-vline 
WA_RDGCHANGE_STR-DGBRGEW_DISLV sy-vline 
WA_RDGCHANGE_STR-DGGEWEI_DISLV sy-vline 
WA_RDGCHANGE_STR-VENUM sy-vline 
WA_RDGCHANGE_STR-VEPOS sy-vline 
WA_RDGCHANGE_STR-PACOD sy-vline 
WA_RDGCHANGE_STR-MATNR_PACK sy-vline 
WA_RDGCHANGE_STR-FLG_DAM_MAT sy-vline 
WA_RDGCHANGE_STR-MSGTY sy-vline 
WA_RDGCHANGE_STR-MSGID sy-vline 
WA_RDGCHANGE_STR-MSGNO sy-vline 
WA_RDGCHANGE_STR-MSGV1 sy-vline 
WA_RDGCHANGE_STR-MSGV2 sy-vline 
WA_RDGCHANGE_STR-MSGV3 sy-vline 
WA_RDGCHANGE_STR-MSGV4 sy-vline 
WA_RDGCHANGE_STR-ALTEXT sy-vline 
WA_RDGCHANGE_STR-USEREXITP sy-vline 
WA_RDGCHANGE_STR-USEREXITF sy-vline 
WA_RDGCHANGE_STR-DETLEVEL sy-vline 
WA_RDGCHANGE_STR-PROBCLASS sy-vline 
WA_RDGCHANGE_STR-ALSORT sy-vline      INTO ld_text SEPARATED BY SPACE.

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