ABAP Select data from SAP table TNRS2 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP TNRS2 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 TNRS2. 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 TNRS2 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_TNRS2 TYPE STANDARD TABLE OF TNRS2,
      WA_TNRS2 TYPE TNRS2,
      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: <TNRS2> TYPE TNRS2.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_TNRS2.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM TNRS2
  INTO TABLE IT_TNRS2.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TNRS2
*  INTO TABLE @DATA(IT_TNRS22).
*--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_TNRS2 INDEX 1 INTO DATA(WA_TNRS22).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_TNRS2 ASSIGNING <TNRS2>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TNRS2>-MANDT = 1.
<TNRS2>-EINRI = 1.
<TNRS2>-APPKL = 1.
<TNRS2>-EVENT = 1.
<TNRS2>-RGART = 1.

ENDLOOP.

LOOP AT IT_TNRS2 INTO WA_TNRS2.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TNRS2-ENDDT, sy-vline,
  WA_TNRS2-BEGDT, sy-vline,
  WA_TNRS2-FBNAM, sy-vline,
  WA_TNRS2-ACTIV, sy-vline,
  WA_TNRS2-PRFNR, sy-vline,
  WA_TNRS2-ABORT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TNRS2 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_TNRS2 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_TNRS2 INTO WA_TNRS2.


*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 EINRI
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TNRS2-EINRI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TNRS2-EINRI.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field RGART
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TNRS2-RGART
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TNRS2-RGART.
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_TNRS2_STR, 
MANDT TYPE STRING,
EINRI TYPE STRING,
APPKL TYPE STRING,
EVENT TYPE STRING,
RGART TYPE STRING,
ENDDT TYPE STRING,
BEGDT TYPE STRING,
FBNAM TYPE STRING,
ACTIV TYPE STRING,
PRFNR TYPE STRING,
ABORT TYPE STRING,
FASTA TYPE STRING,
FAAMB TYPE STRING,
FATST TYPE STRING,
AKTION TYPE STRING,
NOPOP TYPE STRING,
AKTBI TYPE STRING,
AUTHCK TYPE STRING,
ONPOP TYPE STRING,
TARSIGN TYPE STRING,
AUTSIGN TYPE STRING,
PROCSIGN TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TNRS2_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_TNRS2_STR-MANDT sy-vline 
WA_TNRS2_STR-EINRI sy-vline 
WA_TNRS2_STR-APPKL sy-vline 
WA_TNRS2_STR-EVENT sy-vline 
WA_TNRS2_STR-RGART sy-vline 
WA_TNRS2_STR-ENDDT sy-vline 
WA_TNRS2_STR-BEGDT sy-vline 
WA_TNRS2_STR-FBNAM sy-vline 
WA_TNRS2_STR-ACTIV sy-vline 
WA_TNRS2_STR-PRFNR sy-vline 
WA_TNRS2_STR-ABORT sy-vline 
WA_TNRS2_STR-FASTA sy-vline 
WA_TNRS2_STR-FAAMB sy-vline 
WA_TNRS2_STR-FATST sy-vline 
WA_TNRS2_STR-AKTION sy-vline 
WA_TNRS2_STR-NOPOP sy-vline 
WA_TNRS2_STR-AKTBI sy-vline 
WA_TNRS2_STR-AUTHCK sy-vline 
WA_TNRS2_STR-ONPOP sy-vline 
WA_TNRS2_STR-TARSIGN sy-vline 
WA_TNRS2_STR-AUTSIGN sy-vline 
WA_TNRS2_STR-PROCSIGN sy-vline      INTO ld_text SEPARATED BY SPACE.

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