ABAP Select data from SAP table WSII_HEAD into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WSII_HEAD
*  INTO TABLE @DATA(IT_WSII_HEAD2).
*--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_WSII_HEAD INDEX 1 INTO DATA(WA_WSII_HEAD2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WSII_HEAD>-INV_DOC_NO = 1.
<WSII_HEAD>-FISC_YEAR = 1.
<WSII_HEAD>-IV_CATEGORY = 1.
<WSII_HEAD>-DOC_DATE = 1.
<WSII_HEAD>-DOC_DATE_C = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WSII_HEAD-PSTNG_DATE, sy-vline,
  WA_WSII_HEAD-PSTNG_DATE_C, sy-vline,
  WA_WSII_HEAD-REF_DOC_NO, sy-vline,
  WA_WSII_HEAD-REF_DOC_NO_GR, sy-vline,
  WA_WSII_HEAD-GROSS_AMOUNT, sy-vline,
  WA_WSII_HEAD-GROSS_AMOUNT_C, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WSII_HEAD 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_WSII_HEAD 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_WSII_HEAD INTO WA_WSII_HEAD.


*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 INV_DOC_NO
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_WSII_HEAD-INV_DOC_NO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WSII_HEAD-INV_DOC_NO.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GJAHR, internal->external for field FISC_YEAR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_WSII_HEAD-FISC_YEAR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WSII_HEAD-FISC_YEAR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field REVERSAL_DOC
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_WSII_HEAD-REVERSAL_DOC
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WSII_HEAD-REVERSAL_DOC.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GJAHR, internal->external for field REVERSAL_YEAR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_WSII_HEAD-REVERSAL_YEAR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WSII_HEAD-REVERSAL_YEAR.
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_WSII_HEAD_STR, 
INV_DOC_NO TYPE STRING,
FISC_YEAR TYPE STRING,
IV_CATEGORY TYPE STRING,
DOC_DATE TYPE STRING,
DOC_DATE_C TYPE STRING,
PSTNG_DATE TYPE STRING,
PSTNG_DATE_C TYPE STRING,
REF_DOC_NO TYPE STRING,
REF_DOC_NO_GR TYPE STRING,
GROSS_AMOUNT TYPE STRING,
GROSS_AMOUNT_C TYPE STRING,
CURRENCY TYPE STRING,
TRANSACT TYPE STRING,
TRANSACT_D TYPE STRING,
TRANSACT_ORIG TYPE STRING,
PUT_ON_HOLD TYPE STRING,
HOLD_ACTION TYPE STRING,
PMNT_BLOCK TYPE STRING,
PMNT_BLOCK_D TYPE STRING,
REASON_REV TYPE STRING,
REASON_REV_D TYPE STRING,
REVERSAL_DOC TYPE STRING,
REVERSAL_YEAR TYPE STRING,
COMP_CODE TYPE STRING,
CALC_TAX_IND TYPE STRING,
REF_OBJ_TYPE TYPE STRING,
HEADER_TXT TYPE STRING,
INVOICE_STATUS TYPE STRING,
PMNT_BLOCK_STATUS TYPE STRING,
IS_REVERSED TYPE STRING,
IS_REVERSAL TYPE STRING,
STATUS_DESCR TYPE STRING,
CRED_ITM_CLEARED TYPE STRING,
DUMMY_FIELD TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WSII_HEAD_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_WSII_HEAD_STR-INV_DOC_NO sy-vline 
WA_WSII_HEAD_STR-FISC_YEAR sy-vline 
WA_WSII_HEAD_STR-IV_CATEGORY sy-vline 
WA_WSII_HEAD_STR-DOC_DATE sy-vline 
WA_WSII_HEAD_STR-DOC_DATE_C sy-vline 
WA_WSII_HEAD_STR-PSTNG_DATE sy-vline 
WA_WSII_HEAD_STR-PSTNG_DATE_C sy-vline 
WA_WSII_HEAD_STR-REF_DOC_NO sy-vline 
WA_WSII_HEAD_STR-REF_DOC_NO_GR sy-vline 
WA_WSII_HEAD_STR-GROSS_AMOUNT sy-vline 
WA_WSII_HEAD_STR-GROSS_AMOUNT_C sy-vline 
WA_WSII_HEAD_STR-CURRENCY sy-vline 
WA_WSII_HEAD_STR-TRANSACT sy-vline 
WA_WSII_HEAD_STR-TRANSACT_D sy-vline 
WA_WSII_HEAD_STR-TRANSACT_ORIG sy-vline 
WA_WSII_HEAD_STR-PUT_ON_HOLD sy-vline 
WA_WSII_HEAD_STR-HOLD_ACTION sy-vline 
WA_WSII_HEAD_STR-PMNT_BLOCK sy-vline 
WA_WSII_HEAD_STR-PMNT_BLOCK_D sy-vline 
WA_WSII_HEAD_STR-REASON_REV sy-vline 
WA_WSII_HEAD_STR-REASON_REV_D sy-vline 
WA_WSII_HEAD_STR-REVERSAL_DOC sy-vline 
WA_WSII_HEAD_STR-REVERSAL_YEAR sy-vline 
WA_WSII_HEAD_STR-COMP_CODE sy-vline 
WA_WSII_HEAD_STR-CALC_TAX_IND sy-vline 
WA_WSII_HEAD_STR-REF_OBJ_TYPE sy-vline 
WA_WSII_HEAD_STR-HEADER_TXT sy-vline 
WA_WSII_HEAD_STR-INVOICE_STATUS sy-vline 
WA_WSII_HEAD_STR-PMNT_BLOCK_STATUS sy-vline 
WA_WSII_HEAD_STR-IS_REVERSED sy-vline 
WA_WSII_HEAD_STR-IS_REVERSAL sy-vline 
WA_WSII_HEAD_STR-STATUS_DESCR sy-vline 
WA_WSII_HEAD_STR-CRED_ITM_CLEARED sy-vline 
WA_WSII_HEAD_STR-DUMMY_FIELD sy-vline      INTO ld_text SEPARATED BY SPACE.

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