ABAP Select data from SAP table WISO_PREQ into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP WISO_PREQ 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_PREQ. 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_PREQ 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_PREQ TYPE STANDARD TABLE OF WISO_PREQ,
      WA_WISO_PREQ TYPE WISO_PREQ,
      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_PREQ> TYPE WISO_PREQ.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WISO_PREQ
*  INTO TABLE @DATA(IT_WISO_PREQ2).
*--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_PREQ INDEX 1 INTO DATA(WA_WISO_PREQ2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WISO_PREQ>-ITM_NUMBER = 1.
<WISO_PREQ>-PREQ_NO = 1.
<WISO_PREQ>-PREQ_ITEM = 1.
<WISO_PREQ>-VNDR_ID = 1.
<WISO_PREQ>-VNDR_TYPE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WISO_PREQ-VENDOR_NO, sy-vline,
  WA_WISO_PREQ-PLANT, sy-vline,
  WA_WISO_PREQ-VNDR_TYPE_D, sy-vline,
  WA_WISO_PREQ-VNDR_NAME, sy-vline,
  WA_WISO_PREQ-ITEM_CAT, sy-vline,
  WA_WISO_PREQ-ITEM_CAT_D, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WISO_PREQ 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_PREQ 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_PREQ INTO WA_WISO_PREQ.


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

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

*Conversion exit CUNIT, internal->external for field UNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_WISO_PREQ-UNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WISO_PREQ-UNIT.
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_PREQ_STR, 
ITM_NUMBER TYPE STRING,
PREQ_NO TYPE STRING,
PREQ_ITEM TYPE STRING,
VNDR_ID TYPE STRING,
VNDR_TYPE TYPE STRING,
VENDOR_NO TYPE STRING,
PLANT TYPE STRING,
VNDR_TYPE_D TYPE STRING,
VNDR_NAME TYPE STRING,
ITEM_CAT TYPE STRING,
ITEM_CAT_D TYPE STRING,
QUANTITY TYPE STRING,
UNIT TYPE STRING,
QUANTITY_CHAR TYPE STRING,
PRICE TYPE STRING,
CURRENCY TYPE STRING,
PRICE_CHAR TYPE STRING,
PRICE_UNIT TYPE STRING,
PRICE_UNIT_CHAR TYPE STRING,
VEND_MAT TYPE STRING,
PURCH_ORG TYPE STRING,
PUR_GROUP TYPE STRING,
PROC_STAT TYPE STRING,
CLOSED TYPE STRING,
DUMMY_FIELD TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WISO_PREQ_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_PREQ_STR-ITM_NUMBER sy-vline 
WA_WISO_PREQ_STR-PREQ_NO sy-vline 
WA_WISO_PREQ_STR-PREQ_ITEM sy-vline 
WA_WISO_PREQ_STR-VNDR_ID sy-vline 
WA_WISO_PREQ_STR-VNDR_TYPE sy-vline 
WA_WISO_PREQ_STR-VENDOR_NO sy-vline 
WA_WISO_PREQ_STR-PLANT sy-vline 
WA_WISO_PREQ_STR-VNDR_TYPE_D sy-vline 
WA_WISO_PREQ_STR-VNDR_NAME sy-vline 
WA_WISO_PREQ_STR-ITEM_CAT sy-vline 
WA_WISO_PREQ_STR-ITEM_CAT_D sy-vline 
WA_WISO_PREQ_STR-QUANTITY sy-vline 
WA_WISO_PREQ_STR-UNIT sy-vline 
WA_WISO_PREQ_STR-QUANTITY_CHAR sy-vline 
WA_WISO_PREQ_STR-PRICE sy-vline 
WA_WISO_PREQ_STR-CURRENCY sy-vline 
WA_WISO_PREQ_STR-PRICE_CHAR sy-vline 
WA_WISO_PREQ_STR-PRICE_UNIT sy-vline 
WA_WISO_PREQ_STR-PRICE_UNIT_CHAR sy-vline 
WA_WISO_PREQ_STR-VEND_MAT sy-vline 
WA_WISO_PREQ_STR-PURCH_ORG sy-vline 
WA_WISO_PREQ_STR-PUR_GROUP sy-vline 
WA_WISO_PREQ_STR-PROC_STAT sy-vline 
WA_WISO_PREQ_STR-CLOSED sy-vline 
WA_WISO_PREQ_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.