ABAP Select data from SAP table V_TA20NHS into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP V_TA20NHS 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 V_TA20NHS. 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 V_TA20NHS 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_V_TA20NHS TYPE STANDARD TABLE OF V_TA20NHS,
      WA_V_TA20NHS TYPE V_TA20NHS,
      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: <V_TA20NHS> TYPE V_TA20NHS.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_V_TA20NHS.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM V_TA20NHS
  INTO TABLE IT_V_TA20NHS.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM V_TA20NHS
*  INTO TABLE @DATA(IT_V_TA20NHS2).
*--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_V_TA20NHS INDEX 1 INTO DATA(WA_V_TA20NHS2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_V_TA20NHS ASSIGNING <V_TA20NHS>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<V_TA20NHS>-MANDT = 1.
<V_TA20NHS>-HOTEL_ID = 1.
<V_TA20NHS>-BEDTYPE = 1.
<V_TA20NHS>-BEDS = 1.
<V_TA20NHS>-ROOMTYPE = 1.

ENDLOOP.

LOOP AT IT_V_TA20NHS INTO WA_V_TA20NHS.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_V_TA20NHS-RATECODE, sy-vline,
  WA_V_TA20NHS-ENDDA, sy-vline,
  WA_V_TA20NHS-BEGDA, sy-vline,
  WA_V_TA20NHS-CORPDISC, sy-vline,
  WA_V_TA20NHS-PUSE, sy-vline,
  WA_V_TA20NHS-PRICE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_V_TA20NHS 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_V_TA20NHS 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_V_TA20NHS INTO WA_V_TA20NHS.


*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_V_TA20NHS_STR, 
MANDT TYPE STRING,
HOTEL_ID TYPE STRING,
BEDTYPE TYPE STRING,
BEDS TYPE STRING,
ROOMTYPE TYPE STRING,
RATECODE TYPE STRING,
ENDDA TYPE STRING,
BEGDA TYPE STRING,
CORPDISC TYPE STRING,
PUSE TYPE STRING,
PRICE TYPE STRING,
CURRENCY TYPE STRING,
TOTAL_RATE_IND TYPE STRING,
GUARANTEE_NEEDED TYPE STRING,
GUARANTEE TYPE STRING,
DEPOSIT TYPE STRING,
HOLD_IND TYPE STRING,
CORPORATE_ID_IND TYPE STRING,
MIN_STAY_IND TYPE STRING,
MEALS TYPE STRING,
KTEXT TYPE STRING,
PROVIDER TYPE STRING,
LOCID TYPE STRING,
NAME TYPE STRING,
STRASSE TYPE STRING,
STRASSE2 TYPE STRING,
PLZ TYPE STRING,
ORT TYPE STRING,
ORTSTEIL TYPE STRING,
LAND1 TYPE STRING,
LANDX TYPE STRING,
LOCNAME TYPE STRING,
RATE_NAME TYPE STRING,
PROVIDER_NAME TYPE STRING,END OF T_EKKO_STR.
DATA: WA_V_TA20NHS_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_V_TA20NHS_STR-MANDT sy-vline 
WA_V_TA20NHS_STR-HOTEL_ID sy-vline 
WA_V_TA20NHS_STR-BEDTYPE sy-vline 
WA_V_TA20NHS_STR-BEDS sy-vline 
WA_V_TA20NHS_STR-ROOMTYPE sy-vline 
WA_V_TA20NHS_STR-RATECODE sy-vline 
WA_V_TA20NHS_STR-ENDDA sy-vline 
WA_V_TA20NHS_STR-BEGDA sy-vline 
WA_V_TA20NHS_STR-CORPDISC sy-vline 
WA_V_TA20NHS_STR-PUSE sy-vline 
WA_V_TA20NHS_STR-PRICE sy-vline 
WA_V_TA20NHS_STR-CURRENCY sy-vline 
WA_V_TA20NHS_STR-TOTAL_RATE_IND sy-vline 
WA_V_TA20NHS_STR-GUARANTEE_NEEDED sy-vline 
WA_V_TA20NHS_STR-GUARANTEE sy-vline 
WA_V_TA20NHS_STR-DEPOSIT sy-vline 
WA_V_TA20NHS_STR-HOLD_IND sy-vline 
WA_V_TA20NHS_STR-CORPORATE_ID_IND sy-vline 
WA_V_TA20NHS_STR-MIN_STAY_IND sy-vline 
WA_V_TA20NHS_STR-MEALS sy-vline 
WA_V_TA20NHS_STR-KTEXT sy-vline 
WA_V_TA20NHS_STR-PROVIDER sy-vline 
WA_V_TA20NHS_STR-LOCID sy-vline 
WA_V_TA20NHS_STR-NAME sy-vline 
WA_V_TA20NHS_STR-STRASSE sy-vline 
WA_V_TA20NHS_STR-STRASSE2 sy-vline 
WA_V_TA20NHS_STR-PLZ sy-vline 
WA_V_TA20NHS_STR-ORT sy-vline 
WA_V_TA20NHS_STR-ORTSTEIL sy-vline 
WA_V_TA20NHS_STR-LAND1 sy-vline 
WA_V_TA20NHS_STR-LANDX sy-vline 
WA_V_TA20NHS_STR-LOCNAME sy-vline 
WA_V_TA20NHS_STR-RATE_NAME sy-vline 
WA_V_TA20NHS_STR-PROVIDER_NAME sy-vline      INTO ld_text SEPARATED BY SPACE.

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