ABAP Select data from SAP table MAM_30_INV_MNG_ITEM_COMBO into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP MAM_30_INV_MNG_ITEM_COMBO 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 MAM_30_INV_MNG_ITEM_COMBO. 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 MAM_30_INV_MNG_ITEM_COMBO 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_MAM_30_INV_MNG_ITEM_COMBO TYPE STANDARD TABLE OF MAM_30_INV_MNG_ITEM_COMBO,
      WA_MAM_30_INV_MNG_ITEM_COMBO TYPE MAM_30_INV_MNG_ITEM_COMBO,
      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: <MAM_30_INV_MNG_ITEM_COMBO> TYPE MAM_30_INV_MNG_ITEM_COMBO.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_MAM_30_INV_MNG_ITEM_COMBO.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM MAM_30_INV_MNG_ITEM_COMBO
  INTO TABLE IT_MAM_30_INV_MNG_ITEM_COMBO.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MAM_30_INV_MNG_ITEM_COMBO
*  INTO TABLE @DATA(IT_MAM_30_INV_MNG_ITEM_COMBO2).
*--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_MAM_30_INV_MNG_ITEM_COMBO INDEX 1 INTO DATA(WA_MAM_30_INV_MNG_ITEM_COMBO2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_MAM_30_INV_MNG_ITEM_COMBO ASSIGNING <MAM_30_INV_MNG_ITEM_COMBO>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MAM_30_INV_MNG_ITEM_COMBO>-MATERIAL_KEY = 1.
<MAM_30_INV_MNG_ITEM_COMBO>-PLANT = 1.
<MAM_30_INV_MNG_ITEM_COMBO>-CUSTOMER = 1.
<MAM_30_INV_MNG_ITEM_COMBO>-STGE_LOC = 1.
<MAM_30_INV_MNG_ITEM_COMBO>-MATERIAL = 1.

ENDLOOP.

LOOP AT IT_MAM_30_INV_MNG_ITEM_COMBO INTO WA_MAM_30_INV_MNG_ITEM_COMBO.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MAM_30_INV_MNG_ITEM_COMBO-SERIALNO, sy-vline,
  WA_MAM_30_INV_MNG_ITEM_COMBO-EQUIPMENT, sy-vline,
  WA_MAM_30_INV_MNG_ITEM_COMBO-INVENTORY_TYPE, sy-vline,
  WA_MAM_30_INV_MNG_ITEM_COMBO-MATL_DESC, sy-vline,
  WA_MAM_30_INV_MNG_ITEM_COMBO-ENTRY_QNT, sy-vline,
  WA_MAM_30_INV_MNG_ITEM_COMBO-ENTRY_UOM, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MAM_30_INV_MNG_ITEM_COMBO 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_MAM_30_INV_MNG_ITEM_COMBO 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_MAM_30_INV_MNG_ITEM_COMBO INTO WA_MAM_30_INV_MNG_ITEM_COMBO.


*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 CUSTOMER
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MAM_30_INV_MNG_ITEM_COMBO-CUSTOMER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MAM_30_INV_MNG_ITEM_COMBO-CUSTOMER.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field MATERIAL
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_MAM_30_INV_MNG_ITEM_COMBO-MATERIAL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MAM_30_INV_MNG_ITEM_COMBO-MATERIAL.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GERNR, internal->external for field SERIALNO
CALL FUNCTION 'CONVERSION_EXIT_GERNR_OUTPUT'
  EXPORTING
    input =                      WA_MAM_30_INV_MNG_ITEM_COMBO-SERIALNO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MAM_30_INV_MNG_ITEM_COMBO-SERIALNO.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field EQUIPMENT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MAM_30_INV_MNG_ITEM_COMBO-EQUIPMENT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MAM_30_INV_MNG_ITEM_COMBO-EQUIPMENT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field ENTRY_UOM
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_MAM_30_INV_MNG_ITEM_COMBO-ENTRY_UOM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MAM_30_INV_MNG_ITEM_COMBO-ENTRY_UOM.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field MATERIAL_DISPLAY
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_MAM_30_INV_MNG_ITEM_COMBO-MATERIAL_DISPLAY
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MAM_30_INV_MNG_ITEM_COMBO-MATERIAL_DISPLAY.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GERNR, internal->external for field SERIALNO_DISPLAY
CALL FUNCTION 'CONVERSION_EXIT_GERNR_OUTPUT'
  EXPORTING
    input =                      WA_MAM_30_INV_MNG_ITEM_COMBO-SERIALNO_DISPLAY
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MAM_30_INV_MNG_ITEM_COMBO-SERIALNO_DISPLAY.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field EQUIPMENT_DISPLAY
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MAM_30_INV_MNG_ITEM_COMBO-EQUIPMENT_DISPLAY
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MAM_30_INV_MNG_ITEM_COMBO-EQUIPMENT_DISPLAY.
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_MAM_30_INV_MNG_ITEM_COMBO_STR, 
MATERIAL_KEY TYPE STRING,
PLANT TYPE STRING,
CUSTOMER TYPE STRING,
STGE_LOC TYPE STRING,
MATERIAL TYPE STRING,
SERIALNO TYPE STRING,
EQUIPMENT TYPE STRING,
INVENTORY_TYPE TYPE STRING,
MATL_DESC TYPE STRING,
ENTRY_QNT TYPE STRING,
ENTRY_UOM TYPE STRING,
EQUIPMENT_DESC TYPE STRING,
ENHANCEMENT_FLAG TYPE STRING,
MATERIAL_DISPLAY TYPE STRING,
SERIALNO_DISPLAY TYPE STRING,
EQUIPMENT_DISPLAY TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MAM_30_INV_MNG_ITEM_COMBO_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_MAM_30_INV_MNG_ITEM_COMBO_STR-MATERIAL_KEY sy-vline 
WA_MAM_30_INV_MNG_ITEM_COMBO_STR-PLANT sy-vline 
WA_MAM_30_INV_MNG_ITEM_COMBO_STR-CUSTOMER sy-vline 
WA_MAM_30_INV_MNG_ITEM_COMBO_STR-STGE_LOC sy-vline 
WA_MAM_30_INV_MNG_ITEM_COMBO_STR-MATERIAL sy-vline 
WA_MAM_30_INV_MNG_ITEM_COMBO_STR-SERIALNO sy-vline 
WA_MAM_30_INV_MNG_ITEM_COMBO_STR-EQUIPMENT sy-vline 
WA_MAM_30_INV_MNG_ITEM_COMBO_STR-INVENTORY_TYPE sy-vline 
WA_MAM_30_INV_MNG_ITEM_COMBO_STR-MATL_DESC sy-vline 
WA_MAM_30_INV_MNG_ITEM_COMBO_STR-ENTRY_QNT sy-vline 
WA_MAM_30_INV_MNG_ITEM_COMBO_STR-ENTRY_UOM sy-vline 
WA_MAM_30_INV_MNG_ITEM_COMBO_STR-EQUIPMENT_DESC sy-vline 
WA_MAM_30_INV_MNG_ITEM_COMBO_STR-ENHANCEMENT_FLAG sy-vline 
WA_MAM_30_INV_MNG_ITEM_COMBO_STR-MATERIAL_DISPLAY sy-vline 
WA_MAM_30_INV_MNG_ITEM_COMBO_STR-SERIALNO_DISPLAY sy-vline 
WA_MAM_30_INV_MNG_ITEM_COMBO_STR-EQUIPMENT_DISPLAY sy-vline      INTO ld_text SEPARATED BY SPACE.

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