ABAP Select data from SAP table TA20NH into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP TA20NH 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 TA20NH. 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 TA20NH 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_TA20NH TYPE STANDARD TABLE OF TA20NH,
      WA_TA20NH TYPE TA20NH,
      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: <TA20NH> TYPE TA20NH.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_TA20NH.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM TA20NH
  INTO TABLE IT_TA20NH.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TA20NH
*  INTO TABLE @DATA(IT_TA20NH2).
*--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_TA20NH INDEX 1 INTO DATA(WA_TA20NH2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_TA20NH ASSIGNING <TA20NH>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TA20NH>-MANDT = 1.
<TA20NH>-PROVIDER = 1.
<TA20NH>-LOCATIONTYPE = 1.
<TA20NH>-LOCATION = 1.
<TA20NH>-PROPERTY = 1.

ENDLOOP.

LOOP AT IT_TA20NH INTO WA_TA20NH.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TA20NH-HOTELCLASS, sy-vline,
  WA_TA20NH-BEDTYPE, sy-vline,
  WA_TA20NH-ROOMTYPE, sy-vline,
  WA_TA20NH-RATECODE, sy-vline,
  WA_TA20NH-ENDDA, sy-vline,
  WA_TA20NH-BEGDA, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TA20NH 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_TA20NH 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_TA20NH INTO WA_TA20NH.


*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 FMCTP, internal->external for field PROPERTY
CALL FUNCTION 'CONVERSION_EXIT_FMCTP_OUTPUT'
  EXPORTING
    input =                      WA_TA20NH-PROPERTY
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TA20NH-PROPERTY.
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_TA20NH_STR, 
MANDT TYPE STRING,
PROVIDER TYPE STRING,
LOCATIONTYPE TYPE STRING,
LOCATION TYPE STRING,
PROPERTY TYPE STRING,
HOTELCLASS TYPE STRING,
BEDTYPE 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 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TA20NH_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_TA20NH_STR-MANDT sy-vline 
WA_TA20NH_STR-PROVIDER sy-vline 
WA_TA20NH_STR-LOCATIONTYPE sy-vline 
WA_TA20NH_STR-LOCATION sy-vline 
WA_TA20NH_STR-PROPERTY sy-vline 
WA_TA20NH_STR-HOTELCLASS sy-vline 
WA_TA20NH_STR-BEDTYPE sy-vline 
WA_TA20NH_STR-ROOMTYPE sy-vline 
WA_TA20NH_STR-RATECODE sy-vline 
WA_TA20NH_STR-ENDDA sy-vline 
WA_TA20NH_STR-BEGDA sy-vline 
WA_TA20NH_STR-CORPDISC sy-vline 
WA_TA20NH_STR-PUSE sy-vline 
WA_TA20NH_STR-PRICE sy-vline 
WA_TA20NH_STR-CURRENCY sy-vline 
WA_TA20NH_STR-TOTAL_RATE_IND sy-vline 
WA_TA20NH_STR-GUARANTEE sy-vline      INTO ld_text SEPARATED BY SPACE.

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