ABAP Select data from SAP table /ACCGO/MCK_S_ITEM into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /ACCGO/MCK_S_ITEM
*  INTO TABLE @DATA(IT_/ACCGO/MCK_S_ITEM2).
*--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_/ACCGO/MCK_S_ITEM INDEX 1 INTO DATA(WA_/ACCGO/MCK_S_ITEM2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
</ACCGO/MCK_S_ITEM>-SIDE = 1.
</ACCGO/MCK_S_ITEM>-TKONN = 1.
</ACCGO/MCK_S_ITEM>-TPOSN = 1.
</ACCGO/MCK_S_ITEM>-MATNR = 1.
</ACCGO/MCK_S_ITEM>-CUSTOMER = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/ACCGO/MCK_S_ITEM-VENDOR, sy-vline,
  WA_/ACCGO/MCK_S_ITEM-KWMENG, sy-vline,
  WA_/ACCGO/MCK_S_ITEM-VRKME, sy-vline,
  WA_/ACCGO/MCK_S_ITEM-MENGE, sy-vline,
  WA_/ACCGO/MCK_S_ITEM-MEINS, sy-vline,
  WA_/ACCGO/MCK_S_ITEM-DATE_FROM, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/ACCGO/MCK_S_ITEM 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_/ACCGO/MCK_S_ITEM 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_/ACCGO/MCK_S_ITEM INTO WA_/ACCGO/MCK_S_ITEM.


*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 TKONN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/ACCGO/MCK_S_ITEM-TKONN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/ACCGO/MCK_S_ITEM-TKONN.
WRITE:/ 'New Value:', ld_input.

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

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

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

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

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

*Conversion exit CUNIT, internal->external for field BASIS_MEINS
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_/ACCGO/MCK_S_ITEM-BASIS_MEINS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/ACCGO/MCK_S_ITEM-BASIS_MEINS.
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_/ACCGO/MCK_S_ITEM_STR, 
SIDE TYPE STRING,
TKONN TYPE STRING,
TPOSN TYPE STRING,
MATNR TYPE STRING,
CUSTOMER TYPE STRING,
VENDOR TYPE STRING,
KWMENG TYPE STRING,
VRKME TYPE STRING,
MENGE TYPE STRING,
MEINS TYPE STRING,
DATE_FROM TYPE STRING,
DATE_TO TYPE STRING,
BUCKET TYPE STRING,
HKPSTP TYPE STRING,
UMVKZ TYPE STRING,
UMVKN TYPE STRING,
UMREZ_MM TYPE STRING,
UMREN_MM TYPE STRING,
BASIS_MEINS TYPE STRING,
WERKS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/ACCGO/MCK_S_ITEM_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_/ACCGO/MCK_S_ITEM_STR-SIDE sy-vline 
WA_/ACCGO/MCK_S_ITEM_STR-TKONN sy-vline 
WA_/ACCGO/MCK_S_ITEM_STR-TPOSN sy-vline 
WA_/ACCGO/MCK_S_ITEM_STR-MATNR sy-vline 
WA_/ACCGO/MCK_S_ITEM_STR-CUSTOMER sy-vline 
WA_/ACCGO/MCK_S_ITEM_STR-VENDOR sy-vline 
WA_/ACCGO/MCK_S_ITEM_STR-KWMENG sy-vline 
WA_/ACCGO/MCK_S_ITEM_STR-VRKME sy-vline 
WA_/ACCGO/MCK_S_ITEM_STR-MENGE sy-vline 
WA_/ACCGO/MCK_S_ITEM_STR-MEINS sy-vline 
WA_/ACCGO/MCK_S_ITEM_STR-DATE_FROM sy-vline 
WA_/ACCGO/MCK_S_ITEM_STR-DATE_TO sy-vline 
WA_/ACCGO/MCK_S_ITEM_STR-BUCKET sy-vline 
WA_/ACCGO/MCK_S_ITEM_STR-HKPSTP sy-vline 
WA_/ACCGO/MCK_S_ITEM_STR-UMVKZ sy-vline 
WA_/ACCGO/MCK_S_ITEM_STR-UMVKN sy-vline 
WA_/ACCGO/MCK_S_ITEM_STR-UMREZ_MM sy-vline 
WA_/ACCGO/MCK_S_ITEM_STR-UMREN_MM sy-vline 
WA_/ACCGO/MCK_S_ITEM_STR-BASIS_MEINS sy-vline 
WA_/ACCGO/MCK_S_ITEM_STR-WERKS sy-vline      INTO ld_text SEPARATED BY SPACE.

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