ABAP Select data from SAP table IOVDMAINTORDC into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM IOVDMAINTORDC
*  INTO TABLE @DATA(IT_IOVDMAINTORDC2).
*--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_IOVDMAINTORDC INDEX 1 INTO DATA(WA_IOVDMAINTORDC2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<IOVDMAINTORDC>-MANDT = 1.
<IOVDMAINTORDC>-MAINTENANCEORDER = 1.
<IOVDMAINTORDC>-MAINTENANCEORDERDESC = 1.
<IOVDMAINTORDC>-MAINTENANCEPLANNERGROUP = 1.
<IOVDMAINTORDC>-MAINTENANCEREVISION = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_IOVDMAINTORDC-MAINTENANCEPLANNINGPLANT, sy-vline,
  WA_IOVDMAINTORDC-MAINTENANCEPLANT, sy-vline,
  WA_IOVDMAINTORDC-MAINTENANCEORDERTYPE, sy-vline,
  WA_IOVDMAINTORDC-MAINTENANCEORDERTYPENAME, sy-vline,
  WA_IOVDMAINTORDC-MAINTPRIORITY, sy-vline,
  WA_IOVDMAINTORDC-MAINTPRIORITYDESC, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_IOVDMAINTORDC 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_IOVDMAINTORDC 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_IOVDMAINTORDC INTO WA_IOVDMAINTORDC.


*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_IOVDMAINTORDC-MAINTENANCEORDER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IOVDMAINTORDC-MAINTENANCEORDER.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit ALPHA, internal->external for field RESPONSIBLECOSTCENTER
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_IOVDMAINTORDC-RESPONSIBLECOSTCENTER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IOVDMAINTORDC-RESPONSIBLECOSTCENTER.
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_IOVDMAINTORDC_STR, 
MANDT TYPE STRING,
MAINTENANCEORDER TYPE STRING,
MAINTENANCEORDERDESC TYPE STRING,
MAINTENANCEPLANNERGROUP TYPE STRING,
MAINTENANCEREVISION TYPE STRING,
MAINTENANCEPLANNINGPLANT TYPE STRING,
MAINTENANCEPLANT TYPE STRING,
MAINTENANCEORDERTYPE TYPE STRING,
MAINTENANCEORDERTYPENAME TYPE STRING,
MAINTPRIORITY TYPE STRING,
MAINTPRIORITYDESC TYPE STRING,
MAINTPRIORITYCOLORCODE TYPE STRING,
MAINTENANCEACTIVITYTYPE TYPE STRING,
MAINTENANCEACTIVITYTYPENAME TYPE STRING,
MAINWORKCENTER TYPE STRING,
MAINWORKCENTERPLANT TYPE STRING,
MAINWORKCENTERTEXT TYPE STRING,
MAINTENANCEWORKCENTER TYPE STRING,
MAINTENANCEWORKCENTERPLANT TYPE STRING,
MAINTENANCEWORKCENTERTEXT TYPE STRING,
REFERENCEDATE TYPE STRING,
OVERDUEDAYS TYPE STRING,
EQUIPMENT TYPE STRING,
MAINTOBJECTLOCACCTASSGMTNMBR TYPE STRING,
RESPONSIBLECOSTCENTER TYPE STRING,
CONTROLLINGAREA TYPE STRING,END OF T_EKKO_STR.
DATA: WA_IOVDMAINTORDC_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_IOVDMAINTORDC_STR-MANDT sy-vline 
WA_IOVDMAINTORDC_STR-MAINTENANCEORDER sy-vline 
WA_IOVDMAINTORDC_STR-MAINTENANCEORDERDESC sy-vline 
WA_IOVDMAINTORDC_STR-MAINTENANCEPLANNERGROUP sy-vline 
WA_IOVDMAINTORDC_STR-MAINTENANCEREVISION sy-vline 
WA_IOVDMAINTORDC_STR-MAINTENANCEPLANNINGPLANT sy-vline 
WA_IOVDMAINTORDC_STR-MAINTENANCEPLANT sy-vline 
WA_IOVDMAINTORDC_STR-MAINTENANCEORDERTYPE sy-vline 
WA_IOVDMAINTORDC_STR-MAINTENANCEORDERTYPENAME sy-vline 
WA_IOVDMAINTORDC_STR-MAINTPRIORITY sy-vline 
WA_IOVDMAINTORDC_STR-MAINTPRIORITYDESC sy-vline 
WA_IOVDMAINTORDC_STR-MAINTPRIORITYCOLORCODE sy-vline 
WA_IOVDMAINTORDC_STR-MAINTENANCEACTIVITYTYPE sy-vline 
WA_IOVDMAINTORDC_STR-MAINTENANCEACTIVITYTYPENAME sy-vline 
WA_IOVDMAINTORDC_STR-MAINWORKCENTER sy-vline 
WA_IOVDMAINTORDC_STR-MAINWORKCENTERPLANT sy-vline 
WA_IOVDMAINTORDC_STR-MAINWORKCENTERTEXT sy-vline 
WA_IOVDMAINTORDC_STR-MAINTENANCEWORKCENTER sy-vline 
WA_IOVDMAINTORDC_STR-MAINTENANCEWORKCENTERPLANT sy-vline 
WA_IOVDMAINTORDC_STR-MAINTENANCEWORKCENTERTEXT sy-vline 
WA_IOVDMAINTORDC_STR-REFERENCEDATE sy-vline 
WA_IOVDMAINTORDC_STR-OVERDUEDAYS sy-vline 
WA_IOVDMAINTORDC_STR-EQUIPMENT sy-vline 
WA_IOVDMAINTORDC_STR-MAINTOBJECTLOCACCTASSGMTNMBR sy-vline 
WA_IOVDMAINTORDC_STR-RESPONSIBLECOSTCENTER sy-vline 
WA_IOVDMAINTORDC_STR-CONTROLLINGAREA sy-vline      INTO ld_text SEPARATED BY SPACE.

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