ABAP Select data from SAP table MPLA_D into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP MPLA_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 MPLA_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 MPLA_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_MPLA_D TYPE STANDARD TABLE OF MPLA_D,
      WA_MPLA_D TYPE MPLA_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: <MPLA_D> TYPE MPLA_D.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MPLA_D
*  INTO TABLE @DATA(IT_MPLA_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_MPLA_D INDEX 1 INTO DATA(WA_MPLA_D2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MPLA_D>-MANDT = 1.
<MPLA_D>-MAINTENANCEPLAN = 1.
<MPLA_D>-MAINTENANCEPLANDESC = 1.
<MPLA_D>-CREATIONDATE = 1.
<MPLA_D>-CREATEDBYUSER = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MPLA_D-LASTCHANGEDATE, sy-vline,
  WA_MPLA_D-LASTCHANGEDBYUSER, sy-vline,
  WA_MPLA_D-MAINTENANCESTRATEGY, sy-vline,
  WA_MPLA_D-SCHEDULINGDURATION, sy-vline,
  WA_MPLA_D-SCHEDULINGDURATIONUNIT, sy-vline,
  WA_MPLA_D-NUMBEROFMAINTENANCEITEMS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MPLA_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_MPLA_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_MPLA_D INTO WA_MPLA_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 MAINTENANCEPLAN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MPLA_D-MAINTENANCEPLAN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MPLA_D-MAINTENANCEPLAN.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit CUNIT, internal->external for field MAINTPLANSTARTBUFFERUNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_MPLA_D-MAINTPLANSTARTBUFFERUNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MPLA_D-MAINTPLANSTARTBUFFERUNIT.
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_MPLA_D_STR, 
MANDT TYPE STRING,
MAINTENANCEPLAN TYPE STRING,
MAINTENANCEPLANDESC TYPE STRING,
CREATIONDATE TYPE STRING,
CREATEDBYUSER TYPE STRING,
LASTCHANGEDATE TYPE STRING,
LASTCHANGEDBYUSER TYPE STRING,
MAINTENANCESTRATEGY TYPE STRING,
SCHEDULINGDURATION TYPE STRING,
SCHEDULINGDURATIONUNIT TYPE STRING,
NUMBEROFMAINTENANCEITEMS TYPE STRING,
CYCLEMODIFICATIONRATIO TYPE STRING,
MAINTPLANSCHEDGINDICATOR TYPE STRING,
CALLHORIZONPERCENT TYPE STRING,
CALLHORIZONINDAYS TYPE STRING,
MAINTENANCEPLANTYPE TYPE STRING,
MAINTENANCECALLHORIZONCALCTYPE TYPE STRING,
AUTHORIZATIONGROUP TYPE STRING,
MAINTENANCEPLANINTERNALID TYPE STRING,
MAINTENANCEPLANCATEGORY TYPE STRING,
MAINTPLANFREEDEFINEDATTRIB TYPE STRING,
BASICSTARTDATE TYPE STRING,
SCHEDULINGSTARTDATE TYPE STRING,
SCHEDULINGSTARTTIME TYPE STRING,
MAINTPLANSTARTCNTRREADINGVALUE TYPE STRING,
MAINTPLNSTRTBUFDURATIONINDAYS TYPE STRING,
MAINTPLANSTARTBUFFERUNIT TYPE STRING,
FACTORYCALENDAR TYPE STRING,
LATECOMPLETIONSHIFTINPERCENT TYPE STRING,
LATECOMPLETIONTOLERANCEPERCENT TYPE STRING,
EARLYCOMPLETIONSHIFTINPERCENT TYPE STRING,
EARLYCOMPLETIONTOLERANCEPCT TYPE STRING,
PRDCSSRCALLOBJCOMPLTNISRQD TYPE STRING,
MAINTPLANLOGICALOPERATORCODE TYPE STRING,
SCHEDULINGENDDATE TYPE STRING,
MAINTPLANENDCNTRREADINGVALUE TYPE STRING,
LASTCHANGEDATETIME TYPE STRING,
MULTIPLECOUNTERPLANSHIFTFACTOR TYPE STRING,
MAINTENANCELEADFLOATINDAYS TYPE STRING,
MAINTENANCEPLANCALLOBJECT TYPE STRING,
SYSTEMSTATUS TYPE STRING,
MAINTCALLOBJECTTYPETEXT TYPE STRING,
DRAFTENTITYCREATIONDATETIME TYPE STRING,
DRAFTENTITYLASTCHANGEDATETIME TYPE STRING,
DRAFTADMINISTRATIVEDATAUUID TYPE STRING,
DRAFTENTITYOPERATIONCODE TYPE STRING,
HASACTIVEENTITY TYPE STRING,
DRAFTFIELDCHANGES TYPE STRING,
MAINTENANCECALL TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MPLA_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_MPLA_D_STR-MANDT sy-vline 
WA_MPLA_D_STR-MAINTENANCEPLAN sy-vline 
WA_MPLA_D_STR-MAINTENANCEPLANDESC sy-vline 
WA_MPLA_D_STR-CREATIONDATE sy-vline 
WA_MPLA_D_STR-CREATEDBYUSER sy-vline 
WA_MPLA_D_STR-LASTCHANGEDATE sy-vline 
WA_MPLA_D_STR-LASTCHANGEDBYUSER sy-vline 
WA_MPLA_D_STR-MAINTENANCESTRATEGY sy-vline 
WA_MPLA_D_STR-SCHEDULINGDURATION sy-vline 
WA_MPLA_D_STR-SCHEDULINGDURATIONUNIT sy-vline 
WA_MPLA_D_STR-NUMBEROFMAINTENANCEITEMS sy-vline 
WA_MPLA_D_STR-CYCLEMODIFICATIONRATIO sy-vline 
WA_MPLA_D_STR-MAINTPLANSCHEDGINDICATOR sy-vline 
WA_MPLA_D_STR-CALLHORIZONPERCENT sy-vline 
WA_MPLA_D_STR-CALLHORIZONINDAYS sy-vline 
WA_MPLA_D_STR-MAINTENANCEPLANTYPE sy-vline 
WA_MPLA_D_STR-MAINTENANCECALLHORIZONCALCTYPE sy-vline 
WA_MPLA_D_STR-AUTHORIZATIONGROUP sy-vline 
WA_MPLA_D_STR-MAINTENANCEPLANINTERNALID sy-vline 
WA_MPLA_D_STR-MAINTENANCEPLANCATEGORY sy-vline 
WA_MPLA_D_STR-MAINTPLANFREEDEFINEDATTRIB sy-vline 
WA_MPLA_D_STR-BASICSTARTDATE sy-vline 
WA_MPLA_D_STR-SCHEDULINGSTARTDATE sy-vline 
WA_MPLA_D_STR-SCHEDULINGSTARTTIME sy-vline 
WA_MPLA_D_STR-MAINTPLANSTARTCNTRREADINGVALUE sy-vline 
WA_MPLA_D_STR-MAINTPLNSTRTBUFDURATIONINDAYS sy-vline 
WA_MPLA_D_STR-MAINTPLANSTARTBUFFERUNIT sy-vline 
WA_MPLA_D_STR-FACTORYCALENDAR sy-vline 
WA_MPLA_D_STR-LATECOMPLETIONSHIFTINPERCENT sy-vline 
WA_MPLA_D_STR-LATECOMPLETIONTOLERANCEPERCENT sy-vline 
WA_MPLA_D_STR-EARLYCOMPLETIONSHIFTINPERCENT sy-vline 
WA_MPLA_D_STR-EARLYCOMPLETIONTOLERANCEPCT sy-vline 
WA_MPLA_D_STR-PRDCSSRCALLOBJCOMPLTNISRQD sy-vline 
WA_MPLA_D_STR-MAINTPLANLOGICALOPERATORCODE sy-vline 
WA_MPLA_D_STR-SCHEDULINGENDDATE sy-vline 
WA_MPLA_D_STR-MAINTPLANENDCNTRREADINGVALUE sy-vline 
WA_MPLA_D_STR-LASTCHANGEDATETIME sy-vline 
WA_MPLA_D_STR-MULTIPLECOUNTERPLANSHIFTFACTOR sy-vline 
WA_MPLA_D_STR-MAINTENANCELEADFLOATINDAYS sy-vline 
WA_MPLA_D_STR-MAINTENANCEPLANCALLOBJECT sy-vline 
WA_MPLA_D_STR-SYSTEMSTATUS sy-vline 
WA_MPLA_D_STR-MAINTCALLOBJECTTYPETEXT sy-vline 
WA_MPLA_D_STR-DRAFTENTITYCREATIONDATETIME sy-vline 
WA_MPLA_D_STR-DRAFTENTITYLASTCHANGEDATETIME sy-vline 
WA_MPLA_D_STR-DRAFTADMINISTRATIVEDATAUUID sy-vline 
WA_MPLA_D_STR-DRAFTENTITYOPERATIONCODE sy-vline 
WA_MPLA_D_STR-HASACTIVEENTITY sy-vline 
WA_MPLA_D_STR-DRAFTFIELDCHANGES sy-vline 
WA_MPLA_D_STR-MAINTENANCECALL sy-vline      INTO ld_text SEPARATED BY SPACE.

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