ABAP Select data from SAP table TRVSTA_DIS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TRVSTA_DIS
*  INTO TABLE @DATA(IT_TRVSTA_DIS2).
*--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_TRVSTA_DIS INDEX 1 INTO DATA(WA_TRVSTA_DIS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TRVSTA_DIS>-P_ALL#REINR = 1.
<TRVSTA_DIS>-BELEG#BELNR = 1.
<TRVSTA_DIS>-BELEG#BETRG = 1.
<TRVSTA_DIS>-BELEG#WAERS = 1.
<TRVSTA_DIS>-BELEG#KURSB = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TRVSTA_DIS-P_ALL#BETRG, sy-vline,
  WA_TRVSTA_DIS-P_ALL#WAERS, sy-vline,
  WA_TRVSTA_DIS-BELEG#BLDAT, sy-vline,
  WA_TRVSTA_DIS-BELEG#BTEXT, sy-vline,
  WA_TRVSTA_DIS-BELEG#MWSKZ, sy-vline,
  WA_TRVSTA_DIS-BELEG#ANZFR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TRVSTA_DIS 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_TRVSTA_DIS 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_TRVSTA_DIS INTO WA_TRVSTA_DIS.


*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 EXCRT, internal->external for field BELEG#KURSB
CALL FUNCTION 'CONVERSION_EXIT_EXCRT_OUTPUT'
  EXPORTING
    input =                      WA_TRVSTA_DIS-BELEG#KURSB
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TRVSTA_DIS-BELEG#KURSB.
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_TRVSTA_DIS_STR, 
P_ALL#REINR TYPE STRING,
BELEG#BELNR TYPE STRING,
BELEG#BETRG TYPE STRING,
BELEG#WAERS TYPE STRING,
BELEG#KURSB TYPE STRING,
P_ALL#BETRG TYPE STRING,
P_ALL#WAERS TYPE STRING,
BELEG#BLDAT TYPE STRING,
BELEG#BTEXT TYPE STRING,
BELEG#MWSKZ TYPE STRING,
BELEG#ANZFR TYPE STRING,
BELEG#LNDFR TYPE STRING,
BELEG#RGION TYPE STRING,
BELEG#BERFR TYPE STRING,
EXBEL#DATV1 TYPE STRING,
EXBEL#DATB1 TYPE STRING,
EXBEL#ANZAL TYPE STRING,
EXBEL#DESCR TYPE STRING,
EXBEL#PLACE TYPE STRING,
EXBEL#BUSPU TYPE STRING,
EXBEL#BUSRE TYPE STRING,
EXBEL#CCOMP TYPE STRING,
EXBEL#C_DOC TYPE STRING,
EXBEL#C_TXT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TRVSTA_DIS_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_TRVSTA_DIS_STR-P_ALL#REINR sy-vline 
WA_TRVSTA_DIS_STR-BELEG#BELNR sy-vline 
WA_TRVSTA_DIS_STR-BELEG#BETRG sy-vline 
WA_TRVSTA_DIS_STR-BELEG#WAERS sy-vline 
WA_TRVSTA_DIS_STR-BELEG#KURSB sy-vline 
WA_TRVSTA_DIS_STR-P_ALL#BETRG sy-vline 
WA_TRVSTA_DIS_STR-P_ALL#WAERS sy-vline 
WA_TRVSTA_DIS_STR-BELEG#BLDAT sy-vline 
WA_TRVSTA_DIS_STR-BELEG#BTEXT sy-vline 
WA_TRVSTA_DIS_STR-BELEG#MWSKZ sy-vline 
WA_TRVSTA_DIS_STR-BELEG#ANZFR sy-vline 
WA_TRVSTA_DIS_STR-BELEG#LNDFR sy-vline 
WA_TRVSTA_DIS_STR-BELEG#RGION sy-vline 
WA_TRVSTA_DIS_STR-BELEG#BERFR sy-vline 
WA_TRVSTA_DIS_STR-EXBEL#DATV1 sy-vline 
WA_TRVSTA_DIS_STR-EXBEL#DATB1 sy-vline 
WA_TRVSTA_DIS_STR-EXBEL#ANZAL sy-vline 
WA_TRVSTA_DIS_STR-EXBEL#DESCR sy-vline 
WA_TRVSTA_DIS_STR-EXBEL#PLACE sy-vline 
WA_TRVSTA_DIS_STR-EXBEL#BUSPU sy-vline 
WA_TRVSTA_DIS_STR-EXBEL#BUSRE sy-vline 
WA_TRVSTA_DIS_STR-EXBEL#CCOMP sy-vline 
WA_TRVSTA_DIS_STR-EXBEL#C_DOC sy-vline 
WA_TRVSTA_DIS_STR-EXBEL#C_TXT sy-vline      INTO ld_text SEPARATED BY SPACE.

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