ABAP Select data from SAP table WISO_HEAD into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP WISO_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 WISO_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 WISO_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_WISO_HEAD TYPE STANDARD TABLE OF WISO_HEAD,
      WA_WISO_HEAD TYPE WISO_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: <WISO_HEAD> TYPE WISO_HEAD.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WISO_HEAD
*  INTO TABLE @DATA(IT_WISO_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_WISO_HEAD INDEX 1 INTO DATA(WA_WISO_HEAD2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WISO_HEAD>-DOC_NUMBER = 1.
<WISO_HEAD>-CR_DATE = 1.
<WISO_HEAD>-CHG_DATE = 1.
<WISO_HEAD>-REQ_DATE_H = 1.
<WISO_HEAD>-REQ_DATE_CHAR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WISO_HEAD-REQ_DATE_PERIOD, sy-vline,
  WA_WISO_HEAD-REQ_DATE_PERDSCR, sy-vline,
  WA_WISO_HEAD-PURCH_NO_C, sy-vline,
  WA_WISO_HEAD-DOC_TYPE, sy-vline,
  WA_WISO_HEAD-DOC_TYPE_DESCR, sy-vline,
  WA_WISO_HEAD-COMPL_DLV, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WISO_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_WISO_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_WISO_HEAD INTO WA_WISO_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 DOC_NUMBER
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_WISO_HEAD-DOC_NUMBER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WISO_HEAD-DOC_NUMBER.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AUART, internal->external for field DOC_TYPE
CALL FUNCTION 'CONVERSION_EXIT_AUART_OUTPUT'
  EXPORTING
    input =                      WA_WISO_HEAD-DOC_TYPE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WISO_HEAD-DOC_TYPE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field REF_DOC
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_WISO_HEAD-REF_DOC
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WISO_HEAD-REF_DOC.
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_WISO_HEAD_STR, 
DOC_NUMBER TYPE STRING,
CR_DATE TYPE STRING,
CHG_DATE TYPE STRING,
REQ_DATE_H TYPE STRING,
REQ_DATE_CHAR TYPE STRING,
REQ_DATE_PERIOD TYPE STRING,
REQ_DATE_PERDSCR TYPE STRING,
PURCH_NO_C TYPE STRING,
DOC_TYPE TYPE STRING,
DOC_TYPE_DESCR TYPE STRING,
COMPL_DLV TYPE STRING,
DLV_CLLCT TYPE STRING,
DLV_CHAN TYPE STRING,
PLANT_DLV TYPE STRING,
PLANT_DLV_NAME1 TYPE STRING,
PLANT_DLV_FLAG TYPE STRING,
DLV_BLOCK TYPE STRING,
DLV_BLOCK_DESCR TYPE STRING,
REA_FOR_RE TYPE STRING,
REA_FOR_RE_DESCR TYPE STRING,
SD_PRIC_PR TYPE STRING,
CONDITIONS TYPE STRING,
CURRENCY TYPE STRING,
QT_VALID_F TYPE STRING,
QT_VALID_F_CHAR TYPE STRING,
QT_VALID_T TYPE STRING,
QT_VALID_T_CHAR TYPE STRING,
SD_DOC_CAT TYPE STRING,
REF_DOC TYPE STRING,
SD_DOC_CAT_DESCR TYPE STRING,
BILL_BLOCK TYPE STRING,
CREDIT_BLOCKED TYPE STRING,
DLV_BLK_DP_SUGG TYPE STRING,
SHIP_COND TYPE STRING,
SHIP_COND_DESCR TYPE STRING,
DUMMY_FIELD TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WISO_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_WISO_HEAD_STR-DOC_NUMBER sy-vline 
WA_WISO_HEAD_STR-CR_DATE sy-vline 
WA_WISO_HEAD_STR-CHG_DATE sy-vline 
WA_WISO_HEAD_STR-REQ_DATE_H sy-vline 
WA_WISO_HEAD_STR-REQ_DATE_CHAR sy-vline 
WA_WISO_HEAD_STR-REQ_DATE_PERIOD sy-vline 
WA_WISO_HEAD_STR-REQ_DATE_PERDSCR sy-vline 
WA_WISO_HEAD_STR-PURCH_NO_C sy-vline 
WA_WISO_HEAD_STR-DOC_TYPE sy-vline 
WA_WISO_HEAD_STR-DOC_TYPE_DESCR sy-vline 
WA_WISO_HEAD_STR-COMPL_DLV sy-vline 
WA_WISO_HEAD_STR-DLV_CLLCT sy-vline 
WA_WISO_HEAD_STR-DLV_CHAN sy-vline 
WA_WISO_HEAD_STR-PLANT_DLV sy-vline 
WA_WISO_HEAD_STR-PLANT_DLV_NAME1 sy-vline 
WA_WISO_HEAD_STR-PLANT_DLV_FLAG sy-vline 
WA_WISO_HEAD_STR-DLV_BLOCK sy-vline 
WA_WISO_HEAD_STR-DLV_BLOCK_DESCR sy-vline 
WA_WISO_HEAD_STR-REA_FOR_RE sy-vline 
WA_WISO_HEAD_STR-REA_FOR_RE_DESCR sy-vline 
WA_WISO_HEAD_STR-SD_PRIC_PR sy-vline 
WA_WISO_HEAD_STR-CONDITIONS sy-vline 
WA_WISO_HEAD_STR-CURRENCY sy-vline 
WA_WISO_HEAD_STR-QT_VALID_F sy-vline 
WA_WISO_HEAD_STR-QT_VALID_F_CHAR sy-vline 
WA_WISO_HEAD_STR-QT_VALID_T sy-vline 
WA_WISO_HEAD_STR-QT_VALID_T_CHAR sy-vline 
WA_WISO_HEAD_STR-SD_DOC_CAT sy-vline 
WA_WISO_HEAD_STR-REF_DOC sy-vline 
WA_WISO_HEAD_STR-SD_DOC_CAT_DESCR sy-vline 
WA_WISO_HEAD_STR-BILL_BLOCK sy-vline 
WA_WISO_HEAD_STR-CREDIT_BLOCKED sy-vline 
WA_WISO_HEAD_STR-DLV_BLK_DP_SUGG sy-vline 
WA_WISO_HEAD_STR-SHIP_COND sy-vline 
WA_WISO_HEAD_STR-SHIP_COND_DESCR sy-vline 
WA_WISO_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.