ABAP Select data from SAP table WSUBST_SWITCHDAT_STY into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WSUBST_SWITCHDAT_STY
*  INTO TABLE @DATA(IT_WSUBST_SWITCHDAT_STY2).
*--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_WSUBST_SWITCHDAT_STY INDEX 1 INTO DATA(WA_WSUBST_SWITCHDAT_STY2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WSUBST_SWITCHDAT_STY>-MANDT = 1.
<WSUBST_SWITCHDAT_STY>-PO_NUMBER = 1.
<WSUBST_SWITCHDAT_STY>-PO_ITEM_NO = 1.
<WSUBST_SWITCHDAT_STY>-PO_SCHED_NO = 1.
<WSUBST_SWITCHDAT_STY>-REC_PLANT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WSUBST_SWITCHDAT_STY-SUP_PLANT, sy-vline,
  WA_WSUBST_SWITCHDAT_STY-SUP_VENDOR, sy-vline,
  WA_WSUBST_SWITCHDAT_STY-DELIV_DATE, sy-vline,
  WA_WSUBST_SWITCHDAT_STY-ATP_RESULT, sy-vline,
  WA_WSUBST_SWITCHDAT_STY-SUBST_CTRL, sy-vline,
  WA_WSUBST_SWITCHDAT_STY-CTRL_TYPE_ENH, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WSUBST_SWITCHDAT_STY 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_WSUBST_SWITCHDAT_STY 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_WSUBST_SWITCHDAT_STY INTO WA_WSUBST_SWITCHDAT_STY.


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

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

*Conversion exit MATN1, internal->external for field MATNR_ORIG
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_WSUBST_SWITCHDAT_STY-MATNR_ORIG
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WSUBST_SWITCHDAT_STY-MATNR_ORIG.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field UOM_ORIG
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_WSUBST_SWITCHDAT_STY-UOM_ORIG
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WSUBST_SWITCHDAT_STY-UOM_ORIG.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field MATNR_SUBST
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_WSUBST_SWITCHDAT_STY-MATNR_SUBST
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WSUBST_SWITCHDAT_STY-MATNR_SUBST.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field UOM_SUBST
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_WSUBST_SWITCHDAT_STY-UOM_SUBST
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WSUBST_SWITCHDAT_STY-UOM_SUBST.
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_WSUBST_SWITCHDAT_STY_STR, 
MANDT TYPE STRING,
PO_NUMBER TYPE STRING,
PO_ITEM_NO TYPE STRING,
PO_SCHED_NO TYPE STRING,
REC_PLANT TYPE STRING,
SUP_PLANT TYPE STRING,
SUP_VENDOR TYPE STRING,
DELIV_DATE TYPE STRING,
ATP_RESULT TYPE STRING,
SUBST_CTRL TYPE STRING,
CTRL_TYPE_ENH TYPE STRING,
MATNR_ORIG TYPE STRING,
QUANTITY_ORIG TYPE STRING,
UOM_ORIG TYPE STRING,
MATNR_SUBST TYPE STRING,
QUANTITY_SUBST TYPE STRING,
UOM_SUBST TYPE STRING,
DATE_SUBST TYPE STRING,
TIME_SUBST TYPE STRING,
TSTAMP_SUBST TYPE STRING,
APPLICATION TYPE STRING,
SWITCH_TYPE TYPE STRING,
ERNAM TYPE STRING,
AENAM TYPE STRING,
EVALUATION_DATE TYPE STRING,
SWITCH_PER_START TYPE STRING,
SWITCH_PER_END TYPE STRING,
TRANSFERRED TYPE STRING,
DATE_TRANS TYPE STRING,
PACKAGE_ID TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WSUBST_SWITCHDAT_STY_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_WSUBST_SWITCHDAT_STY_STR-MANDT sy-vline 
WA_WSUBST_SWITCHDAT_STY_STR-PO_NUMBER sy-vline 
WA_WSUBST_SWITCHDAT_STY_STR-PO_ITEM_NO sy-vline 
WA_WSUBST_SWITCHDAT_STY_STR-PO_SCHED_NO sy-vline 
WA_WSUBST_SWITCHDAT_STY_STR-REC_PLANT sy-vline 
WA_WSUBST_SWITCHDAT_STY_STR-SUP_PLANT sy-vline 
WA_WSUBST_SWITCHDAT_STY_STR-SUP_VENDOR sy-vline 
WA_WSUBST_SWITCHDAT_STY_STR-DELIV_DATE sy-vline 
WA_WSUBST_SWITCHDAT_STY_STR-ATP_RESULT sy-vline 
WA_WSUBST_SWITCHDAT_STY_STR-SUBST_CTRL sy-vline 
WA_WSUBST_SWITCHDAT_STY_STR-CTRL_TYPE_ENH sy-vline 
WA_WSUBST_SWITCHDAT_STY_STR-MATNR_ORIG sy-vline 
WA_WSUBST_SWITCHDAT_STY_STR-QUANTITY_ORIG sy-vline 
WA_WSUBST_SWITCHDAT_STY_STR-UOM_ORIG sy-vline 
WA_WSUBST_SWITCHDAT_STY_STR-MATNR_SUBST sy-vline 
WA_WSUBST_SWITCHDAT_STY_STR-QUANTITY_SUBST sy-vline 
WA_WSUBST_SWITCHDAT_STY_STR-UOM_SUBST sy-vline 
WA_WSUBST_SWITCHDAT_STY_STR-DATE_SUBST sy-vline 
WA_WSUBST_SWITCHDAT_STY_STR-TIME_SUBST sy-vline 
WA_WSUBST_SWITCHDAT_STY_STR-TSTAMP_SUBST sy-vline 
WA_WSUBST_SWITCHDAT_STY_STR-APPLICATION sy-vline 
WA_WSUBST_SWITCHDAT_STY_STR-SWITCH_TYPE sy-vline 
WA_WSUBST_SWITCHDAT_STY_STR-ERNAM sy-vline 
WA_WSUBST_SWITCHDAT_STY_STR-AENAM sy-vline 
WA_WSUBST_SWITCHDAT_STY_STR-EVALUATION_DATE sy-vline 
WA_WSUBST_SWITCHDAT_STY_STR-SWITCH_PER_START sy-vline 
WA_WSUBST_SWITCHDAT_STY_STR-SWITCH_PER_END sy-vline 
WA_WSUBST_SWITCHDAT_STY_STR-TRANSFERRED sy-vline 
WA_WSUBST_SWITCHDAT_STY_STR-DATE_TRANS sy-vline 
WA_WSUBST_SWITCHDAT_STY_STR-PACKAGE_ID sy-vline      INTO ld_text SEPARATED BY SPACE.

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