ABAP Select data from SAP table MAINTORDCOMP_D into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MAINTORDCOMP_D
*  INTO TABLE @DATA(IT_MAINTORDCOMP_D2).
*--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_MAINTORDCOMP_D INDEX 1 INTO DATA(WA_MAINTORDCOMP_D2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MAINTORDCOMP_D>-MANDT = 1.
<MAINTORDCOMP_D>-DRAFTUUID = 1.
<MAINTORDCOMP_D>-PARENTDRAFTUUID = 1.
<MAINTORDCOMP_D>-ROOTDRAFTUUID = 1.
<MAINTORDCOMP_D>-MAINTENANCEORDER = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MAINTORDCOMP_D-MAINTENANCEORDEROPERATION, sy-vline,
  WA_MAINTORDCOMP_D-MAINTENANCEORDERCOMPONENT, sy-vline,
  WA_MAINTORDCOMP_D-MAINTORDERCOMPONENTFOREDIT, sy-vline,
  WA_MAINTORDCOMP_D-RESERVATION, sy-vline,
  WA_MAINTORDCOMP_D-RESERVATIONITEM, sy-vline,
  WA_MAINTORDCOMP_D-RESERVATIONTYPE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MAINTORDCOMP_D 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_MAINTORDCOMP_D 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_MAINTORDCOMP_D INTO WA_MAINTORDCOMP_D.


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

*Conversion exit NUMCV, internal->external for field MAINTENANCEORDEROPERATION
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_MAINTORDCOMP_D-MAINTENANCEORDEROPERATION
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MAINTORDCOMP_D-MAINTENANCEORDEROPERATION.
WRITE:/ 'New Value:', ld_input.

*Conversion exit NUMCV, internal->external for field MAINTENANCEORDERCOMPONENT
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_MAINTORDCOMP_D-MAINTENANCEORDERCOMPONENT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MAINTORDCOMP_D-MAINTENANCEORDERCOMPONENT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit NUMCV, internal->external for field MAINTORDERCOMPONENTFOREDIT
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_MAINTORDCOMP_D-MAINTORDERCOMPONENTFOREDIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MAINTORDCOMP_D-MAINTORDERCOMPONENTFOREDIT.
WRITE:/ 'New Value:', ld_input.

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

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

*Conversion exit ALPHA, internal->external for field SUPPLIER
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MAINTORDCOMP_D-SUPPLIER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MAINTORDCOMP_D-SUPPLIER.
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_MAINTORDCOMP_D_STR, 
MANDT TYPE STRING,
DRAFTUUID TYPE STRING,
PARENTDRAFTUUID TYPE STRING,
ROOTDRAFTUUID TYPE STRING,
MAINTENANCEORDER TYPE STRING,
MAINTENANCEORDEROPERATION TYPE STRING,
MAINTENANCEORDERCOMPONENT TYPE STRING,
MAINTORDERCOMPONENTFOREDIT TYPE STRING,
RESERVATION TYPE STRING,
RESERVATIONITEM TYPE STRING,
RESERVATIONTYPE TYPE STRING,
MATERIAL TYPE STRING,
MATERIALGROUP TYPE STRING,
COMPONENTDESCRIPTION TYPE STRING,
REQUIREMENTQUANTITYINBASEUNIT TYPE STRING,
BASEUNIT TYPE STRING,
PLANT TYPE STRING,
STORAGELOCATION TYPE STRING,
MAINTORDERROUTINGNUMBER TYPE STRING,
MAINTORDEROPERATIONCOUNTER TYPE STRING,
MAINTORDERCOMPONENTINTERNALID TYPE STRING,
ITEMCATEGORY TYPE STRING,
ISDELETED TYPE STRING,
QUANTITYWITHDRAWNINBASEUNIT TYPE STRING,
SUPPLIER TYPE STRING,
HASACTIVEENTITY TYPE STRING,
DRAFTENTITYCREATIONDATETIME TYPE STRING,
DRAFTENTITYLASTCHANGEDATETIME TYPE STRING,
DRAFTADMINISTRATIVEDATAUUID TYPE STRING,
DRAFTENTITYCONSISTENCYSTATUS TYPE STRING,
DRAFTENTITYOPERATIONCODE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MAINTORDCOMP_D_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_MAINTORDCOMP_D_STR-MANDT sy-vline 
WA_MAINTORDCOMP_D_STR-DRAFTUUID sy-vline 
WA_MAINTORDCOMP_D_STR-PARENTDRAFTUUID sy-vline 
WA_MAINTORDCOMP_D_STR-ROOTDRAFTUUID sy-vline 
WA_MAINTORDCOMP_D_STR-MAINTENANCEORDER sy-vline 
WA_MAINTORDCOMP_D_STR-MAINTENANCEORDEROPERATION sy-vline 
WA_MAINTORDCOMP_D_STR-MAINTENANCEORDERCOMPONENT sy-vline 
WA_MAINTORDCOMP_D_STR-MAINTORDERCOMPONENTFOREDIT sy-vline 
WA_MAINTORDCOMP_D_STR-RESERVATION sy-vline 
WA_MAINTORDCOMP_D_STR-RESERVATIONITEM sy-vline 
WA_MAINTORDCOMP_D_STR-RESERVATIONTYPE sy-vline 
WA_MAINTORDCOMP_D_STR-MATERIAL sy-vline 
WA_MAINTORDCOMP_D_STR-MATERIALGROUP sy-vline 
WA_MAINTORDCOMP_D_STR-COMPONENTDESCRIPTION sy-vline 
WA_MAINTORDCOMP_D_STR-REQUIREMENTQUANTITYINBASEUNIT sy-vline 
WA_MAINTORDCOMP_D_STR-BASEUNIT sy-vline 
WA_MAINTORDCOMP_D_STR-PLANT sy-vline 
WA_MAINTORDCOMP_D_STR-STORAGELOCATION sy-vline 
WA_MAINTORDCOMP_D_STR-MAINTORDERROUTINGNUMBER sy-vline 
WA_MAINTORDCOMP_D_STR-MAINTORDEROPERATIONCOUNTER sy-vline 
WA_MAINTORDCOMP_D_STR-MAINTORDERCOMPONENTINTERNALID sy-vline 
WA_MAINTORDCOMP_D_STR-ITEMCATEGORY sy-vline 
WA_MAINTORDCOMP_D_STR-ISDELETED sy-vline 
WA_MAINTORDCOMP_D_STR-QUANTITYWITHDRAWNINBASEUNIT sy-vline 
WA_MAINTORDCOMP_D_STR-SUPPLIER sy-vline 
WA_MAINTORDCOMP_D_STR-HASACTIVEENTITY sy-vline 
WA_MAINTORDCOMP_D_STR-DRAFTENTITYCREATIONDATETIME sy-vline 
WA_MAINTORDCOMP_D_STR-DRAFTENTITYLASTCHANGEDATETIME sy-vline 
WA_MAINTORDCOMP_D_STR-DRAFTADMINISTRATIVEDATAUUID sy-vline 
WA_MAINTORDCOMP_D_STR-DRAFTENTITYCONSISTENCYSTATUS sy-vline 
WA_MAINTORDCOMP_D_STR-DRAFTENTITYOPERATIONCODE sy-vline      INTO ld_text SEPARATED BY SPACE.

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