ABAP Select data from SAP table P2TN_NHI into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP P2TN_NHI 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_NHI. 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_NHI 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_NHI TYPE STANDARD TABLE OF P2TN_NHI,
      WA_P2TN_NHI TYPE P2TN_NHI,
      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_NHI> TYPE P2TN_NHI.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_P2TN_NHI.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM P2TN_NHI
  INTO TABLE IT_P2TN_NHI.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM P2TN_NHI
*  INTO TABLE @DATA(IT_P2TN_NHI2).
*--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_NHI INDEX 1 INTO DATA(WA_P2TN_NHI2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_P2TN_NHI ASSIGNING <P2TN_NHI>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<P2TN_NHI>-MANDT = 1.
<P2TN_NHI>-DCT_PERNR = 1.
<P2TN_NHI>-DCT_SEQNR = 1.
<P2TN_NHI>-DCT_ROWID = 1.
<P2TN_NHI>-NHINR = 1.

ENDLOOP.

LOOP AT IT_P2TN_NHI INTO WA_P2TN_NHI.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_P2TN_NHI-BEGDA, sy-vline,
  WA_P2TN_NHI-ENDDA, sy-vline,
  WA_P2TN_NHI-NHCAT, sy-vline,
  WA_P2TN_NHI-NHGRP, sy-vline,
  WA_P2TN_NHI-NHICA, sy-vline,
  WA_P2TN_NHI-INAMT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_P2TN_NHI 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_NHI 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_NHI INTO WA_P2TN_NHI.


*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_NHI_STR, 
MANDT TYPE STRING,
DCT_PERNR TYPE STRING,
DCT_SEQNR TYPE STRING,
DCT_ROWID TYPE STRING,
NHINR TYPE STRING,
BEGDA TYPE STRING,
ENDDA TYPE STRING,
NHCAT TYPE STRING,
NHGRP TYPE STRING,
NHICA TYPE STRING,
INAMT TYPE STRING,
INCUR TYPE STRING,
VADAT TYPE STRING,
NHIST TYPE STRING,
NHISR TYPE STRING,
NHIEX TYPE STRING,
EXRSN TYPE STRING,
DISAB TYPE STRING,
SSIPE TYPE STRING,
ERPAY TYPE STRING,
IDNUM TYPE STRING,
ERNHE TYPE STRING,
TAXRT TYPE STRING,
EXRSH TYPE STRING,
NPSTA TYPE STRING,
NPREA TYPE STRING,
ICSTA TYPE STRING,
ICREA TYPE STRING,
PAYDT TYPE STRING,
SERPY TYPE STRING,
NHIVS TYPE STRING,
ERSHE TYPE STRING,
DISSD TYPE STRING,
NHISP TYPE STRING,END OF T_EKKO_STR.
DATA: WA_P2TN_NHI_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_NHI_STR-MANDT sy-vline 
WA_P2TN_NHI_STR-DCT_PERNR sy-vline 
WA_P2TN_NHI_STR-DCT_SEQNR sy-vline 
WA_P2TN_NHI_STR-DCT_ROWID sy-vline 
WA_P2TN_NHI_STR-NHINR sy-vline 
WA_P2TN_NHI_STR-BEGDA sy-vline 
WA_P2TN_NHI_STR-ENDDA sy-vline 
WA_P2TN_NHI_STR-NHCAT sy-vline 
WA_P2TN_NHI_STR-NHGRP sy-vline 
WA_P2TN_NHI_STR-NHICA sy-vline 
WA_P2TN_NHI_STR-INAMT sy-vline 
WA_P2TN_NHI_STR-INCUR sy-vline 
WA_P2TN_NHI_STR-VADAT sy-vline 
WA_P2TN_NHI_STR-NHIST sy-vline 
WA_P2TN_NHI_STR-NHISR sy-vline 
WA_P2TN_NHI_STR-NHIEX sy-vline 
WA_P2TN_NHI_STR-EXRSN sy-vline 
WA_P2TN_NHI_STR-DISAB sy-vline 
WA_P2TN_NHI_STR-SSIPE sy-vline 
WA_P2TN_NHI_STR-ERPAY sy-vline 
WA_P2TN_NHI_STR-IDNUM sy-vline 
WA_P2TN_NHI_STR-ERNHE sy-vline 
WA_P2TN_NHI_STR-TAXRT sy-vline 
WA_P2TN_NHI_STR-EXRSH sy-vline 
WA_P2TN_NHI_STR-NPSTA sy-vline 
WA_P2TN_NHI_STR-NPREA sy-vline 
WA_P2TN_NHI_STR-ICSTA sy-vline 
WA_P2TN_NHI_STR-ICREA sy-vline 
WA_P2TN_NHI_STR-PAYDT sy-vline 
WA_P2TN_NHI_STR-SERPY sy-vline 
WA_P2TN_NHI_STR-NHIVS sy-vline 
WA_P2TN_NHI_STR-ERSHE sy-vline 
WA_P2TN_NHI_STR-DISSD sy-vline 
WA_P2TN_NHI_STR-NHISP sy-vline      INTO ld_text SEPARATED BY SPACE.

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