ABAP Select data from SAP table TDS_ME_PO_ITEM_COMPONENTS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TDS_ME_PO_ITEM_COMPONENTS
*  INTO TABLE @DATA(IT_TDS_ME_PO_ITEM_COMPONENTS2).
*--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_TDS_ME_PO_ITEM_COMPONENTS INDEX 1 INTO DATA(WA_TDS_ME_PO_ITEM_COMPONENTS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TDS_ME_PO_ITEM_COMPONENTS>-PURCHASEORDER = 1.
<TDS_ME_PO_ITEM_COMPONENTS>-PURCHASEORDERITEM = 1.
<TDS_ME_PO_ITEM_COMPONENTS>-PURCHASEORDERSCHEDULELINE = 1.
<TDS_ME_PO_ITEM_COMPONENTS>-RESERVATIONITEM = 1.
<TDS_ME_PO_ITEM_COMPONENTS>-BATCH = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TDS_ME_PO_ITEM_COMPONENTS-MATERIAL, sy-vline,
  WA_TDS_ME_PO_ITEM_COMPONENTS-MATERIALDESCRIPTION, sy-vline,
  WA_TDS_ME_PO_ITEM_COMPONENTS-PLANT, sy-vline,
  WA_TDS_ME_PO_ITEM_COMPONENTS-QUANTITYINENTRYUNIT, sy-vline,
  WA_TDS_ME_PO_ITEM_COMPONENTS-ENTRYUNIT, sy-vline,
ENDLOOP.
   
*Add any further fields from structure WA_TDS_ME_PO_ITEM_COMPONENTS 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_TDS_ME_PO_ITEM_COMPONENTS 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_TDS_ME_PO_ITEM_COMPONENTS INTO WA_TDS_ME_PO_ITEM_COMPONENTS.


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

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

*Conversion exit CUNIT, internal->external for field ENTRYUNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_TDS_ME_PO_ITEM_COMPONENTS-ENTRYUNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TDS_ME_PO_ITEM_COMPONENTS-ENTRYUNIT.
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_TDS_ME_PO_ITEM_COMPONENTS_STR, 
PURCHASEORDER TYPE STRING,
PURCHASEORDERITEM TYPE STRING,
PURCHASEORDERSCHEDULELINE TYPE STRING,
RESERVATIONITEM TYPE STRING,
BATCH TYPE STRING,
MATERIAL TYPE STRING,
MATERIALDESCRIPTION TYPE STRING,
PLANT TYPE STRING,
QUANTITYINENTRYUNIT TYPE STRING,
ENTRYUNIT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TDS_ME_PO_ITEM_COMPONENTS_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_TDS_ME_PO_ITEM_COMPONENTS_STR-PURCHASEORDER sy-vline 
WA_TDS_ME_PO_ITEM_COMPONENTS_STR-PURCHASEORDERITEM sy-vline 
WA_TDS_ME_PO_ITEM_COMPONENTS_STR-PURCHASEORDERSCHEDULELINE sy-vline 
WA_TDS_ME_PO_ITEM_COMPONENTS_STR-RESERVATIONITEM sy-vline 
WA_TDS_ME_PO_ITEM_COMPONENTS_STR-BATCH sy-vline 
WA_TDS_ME_PO_ITEM_COMPONENTS_STR-MATERIAL sy-vline 
WA_TDS_ME_PO_ITEM_COMPONENTS_STR-MATERIALDESCRIPTION sy-vline 
WA_TDS_ME_PO_ITEM_COMPONENTS_STR-PLANT sy-vline 
WA_TDS_ME_PO_ITEM_COMPONENTS_STR-QUANTITYINENTRYUNIT sy-vline 
WA_TDS_ME_PO_ITEM_COMPONENTS_STR-ENTRYUNIT sy-vline      INTO ld_text SEPARATED BY SPACE.

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