ABAP Select data from SAP table TNROS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TNROS
*  INTO TABLE @DATA(IT_TNROS2).
*--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_TNROS INDEX 1 INTO DATA(WA_TNROS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TNROS>-OBJECT = 1.
<TNROS>-DTELSOBJ = 1.
<TNROS>-NRTAB = 1.
<TNROS>-NRINTFLD = 1.
<TNROS>-NREXTFLD = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TNROS-NRFLD, sy-vline,
  WA_TNROS-NRSOBJFLD, sy-vline,
  WA_TNROS-NRELEFLD, sy-vline,
  WA_TNROS-YEARIND, sy-vline,
  WA_TNROS-DOMLEN, sy-vline,
  WA_TNROS-PERCENTAGE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TNROS 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_TNROS 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_TNROS INTO WA_TNROS.


*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_TNROS_STR, 
OBJECT TYPE STRING,
DTELSOBJ TYPE STRING,
NRTAB TYPE STRING,
NRINTFLD TYPE STRING,
NREXTFLD TYPE STRING,
NRFLD TYPE STRING,
NRSOBJFLD TYPE STRING,
NRELEFLD TYPE STRING,
YEARIND TYPE STRING,
DOMLEN TYPE STRING,
PERCENTAGE TYPE STRING,
CODE TYPE STRING,
TEXTIND TYPE STRING,
NRELTXTTAB TYPE STRING,
NRELTXTSOB TYPE STRING,
NRELTXTELE TYPE STRING,
NRELTXTTXT TYPE STRING,
NRELTXTLNG TYPE STRING,
BUFFER TYPE STRING,
NOIVBUFFER TYPE STRING,
NONRSWAP TYPE STRING,
RFCDEST TYPE STRING,
NRCHECKASCII TYPE STRING,
ABAP_LANGUAGE_VERSION TYPE STRING,
STATUS TYPE STRING,
CHANGED_AT TYPE STRING,
CHANGED_BY TYPE STRING,
UNAME TYPE STRING,
UDATE TYPE STRING,
UTIME TYPE STRING,
ENAME TYPE STRING,
EDATE TYPE STRING,
ETIME TYPE STRING,
IGNORE_GROUP TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TNROS_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_TNROS_STR-OBJECT sy-vline 
WA_TNROS_STR-DTELSOBJ sy-vline 
WA_TNROS_STR-NRTAB sy-vline 
WA_TNROS_STR-NRINTFLD sy-vline 
WA_TNROS_STR-NREXTFLD sy-vline 
WA_TNROS_STR-NRFLD sy-vline 
WA_TNROS_STR-NRSOBJFLD sy-vline 
WA_TNROS_STR-NRELEFLD sy-vline 
WA_TNROS_STR-YEARIND sy-vline 
WA_TNROS_STR-DOMLEN sy-vline 
WA_TNROS_STR-PERCENTAGE sy-vline 
WA_TNROS_STR-CODE sy-vline 
WA_TNROS_STR-TEXTIND sy-vline 
WA_TNROS_STR-NRELTXTTAB sy-vline 
WA_TNROS_STR-NRELTXTSOB sy-vline 
WA_TNROS_STR-NRELTXTELE sy-vline 
WA_TNROS_STR-NRELTXTTXT sy-vline 
WA_TNROS_STR-NRELTXTLNG sy-vline 
WA_TNROS_STR-BUFFER sy-vline 
WA_TNROS_STR-NOIVBUFFER sy-vline 
WA_TNROS_STR-NONRSWAP sy-vline 
WA_TNROS_STR-RFCDEST sy-vline 
WA_TNROS_STR-NRCHECKASCII sy-vline 
WA_TNROS_STR-ABAP_LANGUAGE_VERSION sy-vline 
WA_TNROS_STR-STATUS sy-vline 
WA_TNROS_STR-CHANGED_AT sy-vline 
WA_TNROS_STR-CHANGED_BY sy-vline 
WA_TNROS_STR-UNAME sy-vline 
WA_TNROS_STR-UDATE sy-vline 
WA_TNROS_STR-UTIME sy-vline 
WA_TNROS_STR-ENAME sy-vline 
WA_TNROS_STR-EDATE sy-vline 
WA_TNROS_STR-ETIME sy-vline 
WA_TNROS_STR-IGNORE_GROUP sy-vline      INTO ld_text SEPARATED BY SPACE.

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