ABAP Select data from SAP table /SAPDII/WTYHEAD into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP /SAPDII/WTYHEAD 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 /SAPDII/WTYHEAD. 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 /SAPDII/WTYHEAD 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_/SAPDII/WTYHEAD TYPE STANDARD TABLE OF /SAPDII/WTYHEAD,
      WA_/SAPDII/WTYHEAD TYPE /SAPDII/WTYHEAD,
      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: </SAPDII/WTYHEAD> TYPE /SAPDII/WTYHEAD.

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

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM /SAPDII/WTYHEAD
  INTO TABLE IT_/SAPDII/WTYHEAD.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /SAPDII/WTYHEAD
*  INTO TABLE @DATA(IT_/SAPDII/WTYHEAD2).
*--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_/SAPDII/WTYHEAD INDEX 1 INTO DATA(WA_/SAPDII/WTYHEAD2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_/SAPDII/WTYHEAD ASSIGNING </SAPDII/WTYHEAD>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
</SAPDII/WTYHEAD>-CLAIM_TYPE = 1.
</SAPDII/WTYHEAD>-CLAIM_NO = 1.
</SAPDII/WTYHEAD>-VIN_NO = 1.
</SAPDII/WTYHEAD>-REPAIR_DATE = 1.
</SAPDII/WTYHEAD>-EXT_CLAIMNO = 1.

ENDLOOP.

LOOP AT IT_/SAPDII/WTYHEAD INTO WA_/SAPDII/WTYHEAD.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/SAPDII/WTYHEAD-REF_TYPE, sy-vline,
  WA_/SAPDII/WTYHEAD-CLAIM_REF, sy-vline,
  WA_/SAPDII/WTYHEAD-AUTH_CODE, sy-vline,
  WA_/SAPDII/WTYHEAD-AUTH_NAME, sy-vline,
  WA_/SAPDII/WTYHEAD-DLR_SHORTXT, sy-vline,
  WA_/SAPDII/WTYHEAD-DLR_LONGTXT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/SAPDII/WTYHEAD 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_/SAPDII/WTYHEAD 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_/SAPDII/WTYHEAD INTO WA_/SAPDII/WTYHEAD.


*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 ALPHA, internal->external for field CLAIM_NO
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/SAPDII/WTYHEAD-CLAIM_NO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/SAPDII/WTYHEAD-CLAIM_NO.
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_/SAPDII/WTYHEAD_STR, 
CLAIM_TYPE TYPE STRING,
CLAIM_NO TYPE STRING,
VIN_NO TYPE STRING,
REPAIR_DATE TYPE STRING,
EXT_CLAIMNO TYPE STRING,
REF_TYPE TYPE STRING,
CLAIM_REF TYPE STRING,
AUTH_CODE TYPE STRING,
AUTH_NAME TYPE STRING,
DLR_SHORTXT TYPE STRING,
DLR_LONGTXT TYPE STRING,
OBJ_TYPE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/SAPDII/WTYHEAD_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_/SAPDII/WTYHEAD_STR-CLAIM_TYPE sy-vline 
WA_/SAPDII/WTYHEAD_STR-CLAIM_NO sy-vline 
WA_/SAPDII/WTYHEAD_STR-VIN_NO sy-vline 
WA_/SAPDII/WTYHEAD_STR-REPAIR_DATE sy-vline 
WA_/SAPDII/WTYHEAD_STR-EXT_CLAIMNO sy-vline 
WA_/SAPDII/WTYHEAD_STR-REF_TYPE sy-vline 
WA_/SAPDII/WTYHEAD_STR-CLAIM_REF sy-vline 
WA_/SAPDII/WTYHEAD_STR-AUTH_CODE sy-vline 
WA_/SAPDII/WTYHEAD_STR-AUTH_NAME sy-vline 
WA_/SAPDII/WTYHEAD_STR-DLR_SHORTXT sy-vline 
WA_/SAPDII/WTYHEAD_STR-DLR_LONGTXT sy-vline 
WA_/SAPDII/WTYHEAD_STR-OBJ_TYPE sy-vline      INTO ld_text SEPARATED BY SPACE.

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