ABAP Select data from SAP table P2TN_TWDC into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP P2TN_TWDC 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 P2TN_TWDC. 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 P2TN_TWDC 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_P2TN_TWDC TYPE STANDARD TABLE OF P2TN_TWDC,
      WA_P2TN_TWDC TYPE P2TN_TWDC,
      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: <P2TN_TWDC> TYPE P2TN_TWDC.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_P2TN_TWDC.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM P2TN_TWDC
  INTO TABLE IT_P2TN_TWDC.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM P2TN_TWDC
*  INTO TABLE @DATA(IT_P2TN_TWDC2).
*--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_P2TN_TWDC INDEX 1 INTO DATA(WA_P2TN_TWDC2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_P2TN_TWDC ASSIGNING <P2TN_TWDC>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<P2TN_TWDC>-MANDT = 1.
<P2TN_TWDC>-DCT_PERNR = 1.
<P2TN_TWDC>-DCT_SEQNR = 1.
<P2TN_TWDC>-DCT_ROWID = 1.
<P2TN_TWDC>-DEDUC = 1.

ENDLOOP.

LOOP AT IT_P2TN_TWDC INTO WA_P2TN_TWDC.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_P2TN_TWDC-OBJPS, sy-vline,
  WA_P2TN_TWDC-BEGDA, sy-vline,
  WA_P2TN_TWDC-ENDDA, sy-vline,
  WA_P2TN_TWDC-CDEDU, sy-vline,
  WA_P2TN_TWDC-TDEDU, sy-vline,
  WA_P2TN_TWDC-TOTAL, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_P2TN_TWDC 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_P2TN_TWDC 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_P2TN_TWDC INTO WA_P2TN_TWDC.


*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_P2TN_TWDC_STR, 
MANDT TYPE STRING,
DCT_PERNR TYPE STRING,
DCT_SEQNR TYPE STRING,
DCT_ROWID TYPE STRING,
DEDUC TYPE STRING,
OBJPS TYPE STRING,
BEGDA TYPE STRING,
ENDDA TYPE STRING,
CDEDU TYPE STRING,
TDEDU TYPE STRING,
TOTAL TYPE STRING,
INTRS TYPE STRING,
LGART TYPE STRING,
SRATE TYPE STRING,
SFIXA TYPE STRING,
BRATE TYPE STRING,
BFIXA TYPE STRING,
FINAL TYPE STRING,
WAERS TYPE STRING,
REGNO TYPE STRING,
DEPNO TYPE STRING,
ADDEX TYPE STRING,
CDPRO TYPE STRING,
CDLIM TYPE STRING,END OF T_EKKO_STR.
DATA: WA_P2TN_TWDC_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_P2TN_TWDC_STR-MANDT sy-vline 
WA_P2TN_TWDC_STR-DCT_PERNR sy-vline 
WA_P2TN_TWDC_STR-DCT_SEQNR sy-vline 
WA_P2TN_TWDC_STR-DCT_ROWID sy-vline 
WA_P2TN_TWDC_STR-DEDUC sy-vline 
WA_P2TN_TWDC_STR-OBJPS sy-vline 
WA_P2TN_TWDC_STR-BEGDA sy-vline 
WA_P2TN_TWDC_STR-ENDDA sy-vline 
WA_P2TN_TWDC_STR-CDEDU sy-vline 
WA_P2TN_TWDC_STR-TDEDU sy-vline 
WA_P2TN_TWDC_STR-TOTAL sy-vline 
WA_P2TN_TWDC_STR-INTRS sy-vline 
WA_P2TN_TWDC_STR-LGART sy-vline 
WA_P2TN_TWDC_STR-SRATE sy-vline 
WA_P2TN_TWDC_STR-SFIXA sy-vline 
WA_P2TN_TWDC_STR-BRATE sy-vline 
WA_P2TN_TWDC_STR-BFIXA sy-vline 
WA_P2TN_TWDC_STR-FINAL sy-vline 
WA_P2TN_TWDC_STR-WAERS sy-vline 
WA_P2TN_TWDC_STR-REGNO sy-vline 
WA_P2TN_TWDC_STR-DEPNO sy-vline 
WA_P2TN_TWDC_STR-ADDEX sy-vline 
WA_P2TN_TWDC_STR-CDPRO sy-vline 
WA_P2TN_TWDC_STR-CDLIM sy-vline      INTO ld_text SEPARATED BY SPACE.

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