ABAP Select data from SAP table YCHSTRUK into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM YCHSTRUK
*  INTO TABLE @DATA(IT_YCHSTRUK2).
*--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_YCHSTRUK INDEX 1 INTO DATA(WA_YCHSTRUK2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<YCHSTRUK>-CARRID = 1.
<YCHSTRUK>-CONNID = 1.
<YCHSTRUK>-FLDATE = 1.
<YCHSTRUK>-PLANETYPE = 1.
<YCHSTRUK>-CARRNAME = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_YCHSTRUK-CITYFROM, sy-vline,
  WA_YCHSTRUK-CITYTO, sy-vline,
  WA_YCHSTRUK-SEATSMAX, sy-vline,
  WA_YCHSTRUK-SEATSOCC, sy-vline,
  WA_YCHSTRUK-PRODUCER, sy-vline,
  WA_YCHSTRUK-SEATSFREE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_YCHSTRUK 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_YCHSTRUK 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_YCHSTRUK INTO WA_YCHSTRUK.


*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_YCHSTRUK_STR, 
CARRID TYPE STRING,
CONNID TYPE STRING,
FLDATE TYPE STRING,
PLANETYPE TYPE STRING,
CARRNAME TYPE STRING,
CITYFROM TYPE STRING,
CITYTO TYPE STRING,
SEATSMAX TYPE STRING,
SEATSOCC TYPE STRING,
PRODUCER TYPE STRING,
SEATSFREE TYPE STRING,
PROZENT TYPE STRING,
IKONE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_YCHSTRUK_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_YCHSTRUK_STR-CARRID sy-vline 
WA_YCHSTRUK_STR-CONNID sy-vline 
WA_YCHSTRUK_STR-FLDATE sy-vline 
WA_YCHSTRUK_STR-PLANETYPE sy-vline 
WA_YCHSTRUK_STR-CARRNAME sy-vline 
WA_YCHSTRUK_STR-CITYFROM sy-vline 
WA_YCHSTRUK_STR-CITYTO sy-vline 
WA_YCHSTRUK_STR-SEATSMAX sy-vline 
WA_YCHSTRUK_STR-SEATSOCC sy-vline 
WA_YCHSTRUK_STR-PRODUCER sy-vline 
WA_YCHSTRUK_STR-SEATSFREE sy-vline 
WA_YCHSTRUK_STR-PROZENT sy-vline 
WA_YCHSTRUK_STR-IKONE sy-vline      INTO ld_text SEPARATED BY SPACE.

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