ABAP Select data from SAP table MAINTITMOBJLST_D into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP MAINTITMOBJLST_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 MAINTITMOBJLST_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 MAINTITMOBJLST_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_MAINTITMOBJLST_D TYPE STANDARD TABLE OF MAINTITMOBJLST_D,
      WA_MAINTITMOBJLST_D TYPE MAINTITMOBJLST_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: <MAINTITMOBJLST_D> TYPE MAINTITMOBJLST_D.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MAINTITMOBJLST_D
*  INTO TABLE @DATA(IT_MAINTITMOBJLST_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_MAINTITMOBJLST_D INDEX 1 INTO DATA(WA_MAINTITMOBJLST_D2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MAINTITMOBJLST_D>-MANDT = 1.
<MAINTITMOBJLST_D>-MAINTENANCEITEM = 1.
<MAINTITMOBJLST_D>-MAINTENANCEITEMOBJECTLIST = 1.
<MAINTITMOBJLST_D>-MAINTENANCEOBJECTLISTITEM = 1.
<MAINTITMOBJLST_D>-DRAFTUUID = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MAINTITMOBJLST_D-PARENTDRAFTUUID, sy-vline,
  WA_MAINTITMOBJLST_D-MAINTENANCEOBJECTLISTUSAGECODE, sy-vline,
  WA_MAINTITMOBJLST_D-EQUIPMENT, sy-vline,
  WA_MAINTITMOBJLST_D-FUNCTIONALLOCATION, sy-vline,
  WA_MAINTITMOBJLST_D-TECHNICALOBJECT, sy-vline,
  WA_MAINTITMOBJLST_D-TECHOBJISEQUIPORFUNCNLLOC, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MAINTITMOBJLST_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_MAINTITMOBJLST_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_MAINTITMOBJLST_D INTO WA_MAINTITMOBJLST_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 MAINTENANCEITEM
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MAINTITMOBJLST_D-MAINTENANCEITEM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MAINTITMOBJLST_D-MAINTENANCEITEM.
WRITE:/ 'New Value:', ld_input.

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

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

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

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

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

*Conversion exit ALPHA, internal->external for field EQUIPMENTSERIALNUMBER
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MAINTITMOBJLST_D-EQUIPMENTSERIALNUMBER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MAINTITMOBJLST_D-EQUIPMENTSERIALNUMBER.
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_MAINTITMOBJLST_D_STR, 
MANDT TYPE STRING,
MAINTENANCEITEM TYPE STRING,
MAINTENANCEITEMOBJECTLIST TYPE STRING,
MAINTENANCEOBJECTLISTITEM TYPE STRING,
DRAFTUUID TYPE STRING,
PARENTDRAFTUUID TYPE STRING,
MAINTENANCEOBJECTLISTUSAGECODE TYPE STRING,
EQUIPMENT TYPE STRING,
FUNCTIONALLOCATION TYPE STRING,
TECHNICALOBJECT TYPE STRING,
TECHOBJISEQUIPORFUNCNLLOC TYPE STRING,
MAINTENANCENOTIFICATION TYPE STRING,
ASSEMBLY TYPE STRING,
MAINTOBJECTLOCACCTASSGMTNMBR TYPE STRING,
EQUIPMENTMATERIAL TYPE STRING,
EQUIPMENTSERIALNUMBER TYPE STRING,
UNIQUEITEMIDENTIFIER TYPE STRING,
CREATIONDATE TYPE STRING,
MAINTOBJECTLISTITEMSEQUENCE TYPE STRING,
MAINTOBJLISTENTRYISPROCESSED TYPE STRING,
MAINTENANCEPLANCALLOBJECT TYPE STRING,
MAINTENANCEPLANNINGPLANT TYPE STRING,
MAINTENANCEPLANNERGROUP TYPE STRING,
DRAFTENTITYCREATIONDATETIME TYPE STRING,
DRAFTENTITYLASTCHANGEDATETIME TYPE STRING,
DRAFTADMINISTRATIVEDATAUUID TYPE STRING,
DRAFTENTITYOPERATIONCODE TYPE STRING,
HASACTIVEENTITY TYPE STRING,
DRAFTFIELDCHANGES TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MAINTITMOBJLST_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_MAINTITMOBJLST_D_STR-MANDT sy-vline 
WA_MAINTITMOBJLST_D_STR-MAINTENANCEITEM sy-vline 
WA_MAINTITMOBJLST_D_STR-MAINTENANCEITEMOBJECTLIST sy-vline 
WA_MAINTITMOBJLST_D_STR-MAINTENANCEOBJECTLISTITEM sy-vline 
WA_MAINTITMOBJLST_D_STR-DRAFTUUID sy-vline 
WA_MAINTITMOBJLST_D_STR-PARENTDRAFTUUID sy-vline 
WA_MAINTITMOBJLST_D_STR-MAINTENANCEOBJECTLISTUSAGECODE sy-vline 
WA_MAINTITMOBJLST_D_STR-EQUIPMENT sy-vline 
WA_MAINTITMOBJLST_D_STR-FUNCTIONALLOCATION sy-vline 
WA_MAINTITMOBJLST_D_STR-TECHNICALOBJECT sy-vline 
WA_MAINTITMOBJLST_D_STR-TECHOBJISEQUIPORFUNCNLLOC sy-vline 
WA_MAINTITMOBJLST_D_STR-MAINTENANCENOTIFICATION sy-vline 
WA_MAINTITMOBJLST_D_STR-ASSEMBLY sy-vline 
WA_MAINTITMOBJLST_D_STR-MAINTOBJECTLOCACCTASSGMTNMBR sy-vline 
WA_MAINTITMOBJLST_D_STR-EQUIPMENTMATERIAL sy-vline 
WA_MAINTITMOBJLST_D_STR-EQUIPMENTSERIALNUMBER sy-vline 
WA_MAINTITMOBJLST_D_STR-UNIQUEITEMIDENTIFIER sy-vline 
WA_MAINTITMOBJLST_D_STR-CREATIONDATE sy-vline 
WA_MAINTITMOBJLST_D_STR-MAINTOBJECTLISTITEMSEQUENCE sy-vline 
WA_MAINTITMOBJLST_D_STR-MAINTOBJLISTENTRYISPROCESSED sy-vline 
WA_MAINTITMOBJLST_D_STR-MAINTENANCEPLANCALLOBJECT sy-vline 
WA_MAINTITMOBJLST_D_STR-MAINTENANCEPLANNINGPLANT sy-vline 
WA_MAINTITMOBJLST_D_STR-MAINTENANCEPLANNERGROUP sy-vline 
WA_MAINTITMOBJLST_D_STR-DRAFTENTITYCREATIONDATETIME sy-vline 
WA_MAINTITMOBJLST_D_STR-DRAFTENTITYLASTCHANGEDATETIME sy-vline 
WA_MAINTITMOBJLST_D_STR-DRAFTADMINISTRATIVEDATAUUID sy-vline 
WA_MAINTITMOBJLST_D_STR-DRAFTENTITYOPERATIONCODE sy-vline 
WA_MAINTITMOBJLST_D_STR-HASACTIVEENTITY sy-vline 
WA_MAINTITMOBJLST_D_STR-DRAFTFIELDCHANGES sy-vline      INTO ld_text SEPARATED BY SPACE.

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