ABAP Select data from SAP table MMPT_D into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP MMPT_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 MMPT_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 MMPT_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_MMPT_D TYPE STANDARD TABLE OF MMPT_D,
      WA_MMPT_D TYPE MMPT_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: <MMPT_D> TYPE MMPT_D.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MMPT_D
*  INTO TABLE @DATA(IT_MMPT_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_MMPT_D INDEX 1 INTO DATA(WA_MMPT_D2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MMPT_D>-MANDT = 1.
<MMPT_D>-MAINTENANCEPLAN = 1.
<MMPT_D>-MAINTENANCEPLANCYCLE = 1.
<MMPT_D>-MAINTENANCESTRATEGY = 1.
<MMPT_D>-CYCLESETSEQUENCE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MMPT_D-MAINTPLANCYCRCRRCINTERVALQTY, sy-vline,
  WA_MMPT_D-MAINTPLANCYCRCRRCINTERVALUNIT, sy-vline,
  WA_MMPT_D-MAINTPLANCYCLEDESC, sy-vline,
  WA_MMPT_D-MEASURINGPOINT, sy-vline,
  WA_MMPT_D-MAINTPLANCYCLESTARTOFFSETVALUE, sy-vline,
  WA_MMPT_D-MAINTCYCLENEXTPLNDCNTRRDNG, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MMPT_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_MMPT_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_MMPT_D INTO WA_MMPT_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_MMPT_D-MAINTENANCEPLAN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MMPT_D-MAINTENANCEPLAN.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit ALPHA, internal->external for field MEASURINGPOINT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MMPT_D-MEASURINGPOINT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MMPT_D-MEASURINGPOINT.
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_MMPT_D_STR, 
MANDT TYPE STRING,
MAINTENANCEPLAN TYPE STRING,
MAINTENANCEPLANCYCLE TYPE STRING,
MAINTENANCESTRATEGY TYPE STRING,
CYCLESETSEQUENCE TYPE STRING,
MAINTPLANCYCRCRRCINTERVALQTY TYPE STRING,
MAINTPLANCYCRCRRCINTERVALUNIT TYPE STRING,
MAINTPLANCYCLEDESC TYPE STRING,
MEASURINGPOINT TYPE STRING,
MAINTPLANCYCLESTARTOFFSETVALUE TYPE STRING,
MAINTCYCLENEXTPLNDCNTRRDNG TYPE STRING,
MAINTENANCEPLANCYCLEISINACTIVE TYPE STRING,
CYCLESETSEQUENCEREPEATFACTOR 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_MMPT_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_MMPT_D_STR-MANDT sy-vline 
WA_MMPT_D_STR-MAINTENANCEPLAN sy-vline 
WA_MMPT_D_STR-MAINTENANCEPLANCYCLE sy-vline 
WA_MMPT_D_STR-MAINTENANCESTRATEGY sy-vline 
WA_MMPT_D_STR-CYCLESETSEQUENCE sy-vline 
WA_MMPT_D_STR-MAINTPLANCYCRCRRCINTERVALQTY sy-vline 
WA_MMPT_D_STR-MAINTPLANCYCRCRRCINTERVALUNIT sy-vline 
WA_MMPT_D_STR-MAINTPLANCYCLEDESC sy-vline 
WA_MMPT_D_STR-MEASURINGPOINT sy-vline 
WA_MMPT_D_STR-MAINTPLANCYCLESTARTOFFSETVALUE sy-vline 
WA_MMPT_D_STR-MAINTCYCLENEXTPLNDCNTRRDNG sy-vline 
WA_MMPT_D_STR-MAINTENANCEPLANCYCLEISINACTIVE sy-vline 
WA_MMPT_D_STR-CYCLESETSEQUENCEREPEATFACTOR sy-vline 
WA_MMPT_D_STR-DRAFTENTITYCREATIONDATETIME sy-vline 
WA_MMPT_D_STR-DRAFTENTITYLASTCHANGEDATETIME sy-vline 
WA_MMPT_D_STR-DRAFTADMINISTRATIVEDATAUUID sy-vline 
WA_MMPT_D_STR-DRAFTENTITYOPERATIONCODE sy-vline 
WA_MMPT_D_STR-HASACTIVEENTITY sy-vline 
WA_MMPT_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.