ABAP Select data from SAP table MC18I00ITM into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP MC18I00ITM 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 MC18I00ITM. 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 MC18I00ITM 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_MC18I00ITM TYPE STANDARD TABLE OF MC18I00ITM,
      WA_MC18I00ITM TYPE MC18I00ITM,
      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: <MC18I00ITM> TYPE MC18I00ITM.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_MC18I00ITM.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM MC18I00ITM
  INTO TABLE IT_MC18I00ITM.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MC18I00ITM
*  INTO TABLE @DATA(IT_MC18I00ITM2).
*--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_MC18I00ITM INDEX 1 INTO DATA(WA_MC18I00ITM2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_MC18I00ITM ASSIGNING <MC18I00ITM>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MC18I00ITM>-ROCANCEL = 1.
<MC18I00ITM>-BAUTL_HD = 1.
<MC18I00ITM>-EQUNR = 1.
<MC18I00ITM>-HERKZ = 1.
<MC18I00ITM>-KUNUM = 1.

ENDLOOP.

LOOP AT IT_MC18I00ITM INTO WA_MC18I00ITM.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MC18I00ITM-QMART, sy-vline,
  WA_MC18I00ITM-QMDAT, sy-vline,
  WA_MC18I00ITM-QMNUM, sy-vline,
  WA_MC18I00ITM-SPART, sy-vline,
  WA_MC18I00ITM-TPLNR, sy-vline,
  WA_MC18I00ITM-VKORG, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MC18I00ITM 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_MC18I00ITM 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_MC18I00ITM INTO WA_MC18I00ITM.


*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 MATN1, internal->external for field BAUTL_HD
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_MC18I00ITM-BAUTL_HD
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MC18I00ITM-BAUTL_HD.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field EQUNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MC18I00ITM-EQUNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MC18I00ITM-EQUNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KUNUM
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MC18I00ITM-KUNUM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MC18I00ITM-KUNUM.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field QMNUM
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MC18I00ITM-QMNUM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MC18I00ITM-QMNUM.
WRITE:/ 'New Value:', ld_input.

*Conversion exit TPLNR, internal->external for field TPLNR
CALL FUNCTION 'CONVERSION_EXIT_TPLNR_OUTPUT'
  EXPORTING
    input =                      WA_MC18I00ITM-TPLNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MC18I00ITM-TPLNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field BAUTL
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_MC18I00ITM-BAUTL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MC18I00ITM-BAUTL.
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_MC18I00ITM_STR, 
ROCANCEL TYPE STRING,
BAUTL_HD TYPE STRING,
EQUNR TYPE STRING,
HERKZ TYPE STRING,
KUNUM TYPE STRING,
QMART TYPE STRING,
QMDAT TYPE STRING,
QMNUM TYPE STRING,
SPART TYPE STRING,
TPLNR TYPE STRING,
VKORG TYPE STRING,
VTWEG TYPE STRING,
BAUTL TYPE STRING,
FECOD TYPE STRING,
FEGRP TYPE STRING,
FEKAT TYPE STRING,
FEQKLAS TYPE STRING,
OTEIL TYPE STRING,
OTGRP TYPE STRING,
OTKAT TYPE STRING,
ZHLPROBL TYPE STRING,
KEY_FENUM TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MC18I00ITM_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_MC18I00ITM_STR-ROCANCEL sy-vline 
WA_MC18I00ITM_STR-BAUTL_HD sy-vline 
WA_MC18I00ITM_STR-EQUNR sy-vline 
WA_MC18I00ITM_STR-HERKZ sy-vline 
WA_MC18I00ITM_STR-KUNUM sy-vline 
WA_MC18I00ITM_STR-QMART sy-vline 
WA_MC18I00ITM_STR-QMDAT sy-vline 
WA_MC18I00ITM_STR-QMNUM sy-vline 
WA_MC18I00ITM_STR-SPART sy-vline 
WA_MC18I00ITM_STR-TPLNR sy-vline 
WA_MC18I00ITM_STR-VKORG sy-vline 
WA_MC18I00ITM_STR-VTWEG sy-vline 
WA_MC18I00ITM_STR-BAUTL sy-vline 
WA_MC18I00ITM_STR-FECOD sy-vline 
WA_MC18I00ITM_STR-FEGRP sy-vline 
WA_MC18I00ITM_STR-FEKAT sy-vline 
WA_MC18I00ITM_STR-FEQKLAS sy-vline 
WA_MC18I00ITM_STR-OTEIL sy-vline 
WA_MC18I00ITM_STR-OTGRP sy-vline 
WA_MC18I00ITM_STR-OTKAT sy-vline 
WA_MC18I00ITM_STR-ZHLPROBL sy-vline 
WA_MC18I00ITM_STR-KEY_FENUM sy-vline      INTO ld_text SEPARATED BY SPACE.

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