ABAP Select data from SAP table DYNPGEN into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DYNPGEN
*  INTO TABLE @DATA(IT_DYNPGEN2).
*--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_DYNPGEN INDEX 1 INTO DATA(WA_DYNPGEN2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DYNPGEN>-TXD = 1.
<DYNPGEN>-DD1 = 1.
<DYNPGEN>-DD2 = 1.
<DYNPGEN>-DD3 = 1.
<DYNPGEN>-DD4 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DYNPGEN-TXT, sy-vline,
  WA_DYNPGEN-DAT, sy-vline,
  WA_DYNPGEN-DTX, sy-vline,
  WA_DYNPGEN-PIC, sy-vline,
  WA_DYNPGEN-CO3, sy-vline,
ENDLOOP.
   
*Add any further fields from structure WA_DYNPGEN 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_DYNPGEN 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_DYNPGEN INTO WA_DYNPGEN.


*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_DYNPGEN_STR, 
TXD TYPE STRING,
DD1 TYPE STRING,
DD2 TYPE STRING,
DD3 TYPE STRING,
DD4 TYPE STRING,
TXT TYPE STRING,
DAT TYPE STRING,
DTX TYPE STRING,
PIC TYPE STRING,
CO3 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DYNPGEN_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_DYNPGEN_STR-TXD sy-vline 
WA_DYNPGEN_STR-DD1 sy-vline 
WA_DYNPGEN_STR-DD2 sy-vline 
WA_DYNPGEN_STR-DD3 sy-vline 
WA_DYNPGEN_STR-DD4 sy-vline 
WA_DYNPGEN_STR-TXT sy-vline 
WA_DYNPGEN_STR-DAT sy-vline 
WA_DYNPGEN_STR-DTX sy-vline 
WA_DYNPGEN_STR-PIC sy-vline 
WA_DYNPGEN_STR-CO3 sy-vline      INTO ld_text SEPARATED BY SPACE.

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