ABAP Select data from SAP table P2TN_SI into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP P2TN_SI 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_SI. 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_SI 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_SI TYPE STANDARD TABLE OF P2TN_SI,
      WA_P2TN_SI TYPE P2TN_SI,
      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_SI> TYPE P2TN_SI.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_P2TN_SI.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM P2TN_SI
  INTO TABLE IT_P2TN_SI.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM P2TN_SI
*  INTO TABLE @DATA(IT_P2TN_SI2).
*--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_SI INDEX 1 INTO DATA(WA_P2TN_SI2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_P2TN_SI ASSIGNING <P2TN_SI>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<P2TN_SI>-MANDT = 1.
<P2TN_SI>-DCT_PERNR = 1.
<P2TN_SI>-DCT_SEQNR = 1.
<P2TN_SI>-DCT_ROWID = 1.
<P2TN_SI>-CNTR1 = 1.

ENDLOOP.

LOOP AT IT_P2TN_SI INTO WA_P2TN_SI.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_P2TN_SI-BEGDA, sy-vline,
  WA_P2TN_SI-ENDDA, sy-vline,
  WA_P2TN_SI-LISTU, sy-vline,
  WA_P2TN_SI-LICAT, sy-vline,
  WA_P2TN_SI-INAMT, sy-vline,
  WA_P2TN_SI-INCUR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_P2TN_SI 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_SI 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_SI INTO WA_P2TN_SI.


*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_SI_STR, 
MANDT TYPE STRING,
DCT_PERNR TYPE STRING,
DCT_SEQNR TYPE STRING,
DCT_ROWID TYPE STRING,
CNTR1 TYPE STRING,
BEGDA TYPE STRING,
ENDDA TYPE STRING,
LISTU TYPE STRING,
LICAT TYPE STRING,
INAMT TYPE STRING,
INCUR TYPE STRING,
ERPAY TYPE STRING,
DISAB TYPE STRING,
SSIPE TYPE STRING,
BRCOD TYPE STRING,
IDNUM TYPE STRING,
LIDAY TYPE STRING,
SIREP TYPE STRING,
UNEMS TYPE STRING,
OCUST TYPE STRING,
LIEXP TYPE STRING,
EIEXP TYPE STRING,
ERLIE TYPE STRING,
EREIE TYPE STRING,
EEEIE TYPE STRING,
EROCE TYPE STRING,
ERDFE TYPE STRING,
FRTWS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_P2TN_SI_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_SI_STR-MANDT sy-vline 
WA_P2TN_SI_STR-DCT_PERNR sy-vline 
WA_P2TN_SI_STR-DCT_SEQNR sy-vline 
WA_P2TN_SI_STR-DCT_ROWID sy-vline 
WA_P2TN_SI_STR-CNTR1 sy-vline 
WA_P2TN_SI_STR-BEGDA sy-vline 
WA_P2TN_SI_STR-ENDDA sy-vline 
WA_P2TN_SI_STR-LISTU sy-vline 
WA_P2TN_SI_STR-LICAT sy-vline 
WA_P2TN_SI_STR-INAMT sy-vline 
WA_P2TN_SI_STR-INCUR sy-vline 
WA_P2TN_SI_STR-ERPAY sy-vline 
WA_P2TN_SI_STR-DISAB sy-vline 
WA_P2TN_SI_STR-SSIPE sy-vline 
WA_P2TN_SI_STR-BRCOD sy-vline 
WA_P2TN_SI_STR-IDNUM sy-vline 
WA_P2TN_SI_STR-LIDAY sy-vline 
WA_P2TN_SI_STR-SIREP sy-vline 
WA_P2TN_SI_STR-UNEMS sy-vline 
WA_P2TN_SI_STR-OCUST sy-vline 
WA_P2TN_SI_STR-LIEXP sy-vline 
WA_P2TN_SI_STR-EIEXP sy-vline 
WA_P2TN_SI_STR-ERLIE sy-vline 
WA_P2TN_SI_STR-EREIE sy-vline 
WA_P2TN_SI_STR-EEEIE sy-vline 
WA_P2TN_SI_STR-EROCE sy-vline 
WA_P2TN_SI_STR-ERDFE sy-vline 
WA_P2TN_SI_STR-FRTWS sy-vline      INTO ld_text SEPARATED BY SPACE.

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