ABAP Select data from SAP table IMAINTPLAN into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM IMAINTPLAN
*  INTO TABLE @DATA(IT_IMAINTPLAN2).
*--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_IMAINTPLAN INDEX 1 INTO DATA(WA_IMAINTPLAN2).


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

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

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_IMAINTPLAN-LASTCHANGEDATE, sy-vline,
  WA_IMAINTPLAN-LASTCHANGEDBYUSER, sy-vline,
  WA_IMAINTPLAN-MAINTENANCESTRATEGY, sy-vline,
  WA_IMAINTPLAN-SCHEDULINGDURATION, sy-vline,
  WA_IMAINTPLAN-EQUIPMENT, sy-vline,
  WA_IMAINTPLAN-FUNCTIONALLOCATION, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_IMAINTPLAN 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_IMAINTPLAN 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_IMAINTPLAN INTO WA_IMAINTPLAN.


*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_IMAINTPLAN-MAINTENANCEPLAN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IMAINTPLAN-MAINTENANCEPLAN.
WRITE:/ 'New Value:', ld_input.

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

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

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

*Conversion exit ISOLA, internal->external for field LANGUAGE
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_IMAINTPLAN-LANGUAGE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IMAINTPLAN-LANGUAGE.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit CUNIT, internal->external for field MAINTPLANSTARTBUFFERUNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_IMAINTPLAN-MAINTPLANSTARTBUFFERUNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IMAINTPLAN-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_IMAINTPLAN_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,
EQUIPMENT TYPE STRING,
FUNCTIONALLOCATION TYPE STRING,
CUSTOMER TYPE STRING,
NUMBEROFMAINTENANCEITEMS TYPE STRING,
LANGUAGE TYPE STRING,
CYCLEMODIFICATIONRATIO TYPE STRING,
MAINTPLANSCHEDGINDICATOR TYPE STRING,
CALLHORIZONPERCENT TYPE STRING,
CALLHORIZONINDAYS TYPE STRING,
AUTHORIZATIONGROUP TYPE STRING,
MAINTENANCEPLANINTERNALID TYPE STRING,
MAINTENANCECALL TYPE STRING,
MAINTENANCEPLANCATEGORY TYPE STRING,
SCHEDULINGDURATIONUNIT TYPE STRING,
BASICSTARTDATE TYPE STRING,
MAINTPLANFREEDEFINEDATTRIB TYPE STRING,
FACTORYCALENDAR TYPE STRING,
MAINTPLANISLOCKEDAGAINSTCALLS TYPE STRING,
LASTCHANGEDATETIME TYPE STRING,
LATECOMPLETIONSHIFTFACTOR TYPE STRING,
EARLYCOMPLETIONSHIFTFACTOR TYPE STRING,
LATECOMPLETIONTOLERANCEPERCENT TYPE STRING,
EARLYCOMPLETIONTOLERANCEPCT TYPE STRING,
MAINTENANCECALLHORIZONCALCTYPE TYPE STRING,
LOGICALOPERATOR TYPE STRING,
MULTIPLECOUNTERPLANSHIFTFACTOR TYPE STRING,
MAINTSCHEDULINGSTARTCOUNTER TYPE STRING,
SCHEDULINGSTARTDATE TYPE STRING,
SCHEDULINGSTARTTIME TYPE STRING,
MAINTSCHEDULINGENDCOUNTER TYPE STRING,
SCHEDULINGENDDATE TYPE STRING,
MAINTENANCELEADFLOATINDAYS TYPE STRING,
MAINTPLANSTARTBUFFERQUANTITY TYPE STRING,
MAINTPLANSTARTBUFFERUNIT TYPE STRING,
PRDCSSRCALLOBJCOMPLTNISRQD TYPE STRING,
MAINTENANCEPLANHASLONGTEXT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_IMAINTPLAN_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_IMAINTPLAN_STR-MANDT sy-vline 
WA_IMAINTPLAN_STR-MAINTENANCEPLAN sy-vline 
WA_IMAINTPLAN_STR-MAINTENANCEPLANDESC sy-vline 
WA_IMAINTPLAN_STR-CREATIONDATE sy-vline 
WA_IMAINTPLAN_STR-CREATEDBYUSER sy-vline 
WA_IMAINTPLAN_STR-LASTCHANGEDATE sy-vline 
WA_IMAINTPLAN_STR-LASTCHANGEDBYUSER sy-vline 
WA_IMAINTPLAN_STR-MAINTENANCESTRATEGY sy-vline 
WA_IMAINTPLAN_STR-SCHEDULINGDURATION sy-vline 
WA_IMAINTPLAN_STR-EQUIPMENT sy-vline 
WA_IMAINTPLAN_STR-FUNCTIONALLOCATION sy-vline 
WA_IMAINTPLAN_STR-CUSTOMER sy-vline 
WA_IMAINTPLAN_STR-NUMBEROFMAINTENANCEITEMS sy-vline 
WA_IMAINTPLAN_STR-LANGUAGE sy-vline 
WA_IMAINTPLAN_STR-CYCLEMODIFICATIONRATIO sy-vline 
WA_IMAINTPLAN_STR-MAINTPLANSCHEDGINDICATOR sy-vline 
WA_IMAINTPLAN_STR-CALLHORIZONPERCENT sy-vline 
WA_IMAINTPLAN_STR-CALLHORIZONINDAYS sy-vline 
WA_IMAINTPLAN_STR-AUTHORIZATIONGROUP sy-vline 
WA_IMAINTPLAN_STR-MAINTENANCEPLANINTERNALID sy-vline 
WA_IMAINTPLAN_STR-MAINTENANCECALL sy-vline 
WA_IMAINTPLAN_STR-MAINTENANCEPLANCATEGORY sy-vline 
WA_IMAINTPLAN_STR-SCHEDULINGDURATIONUNIT sy-vline 
WA_IMAINTPLAN_STR-BASICSTARTDATE sy-vline 
WA_IMAINTPLAN_STR-MAINTPLANFREEDEFINEDATTRIB sy-vline 
WA_IMAINTPLAN_STR-FACTORYCALENDAR sy-vline 
WA_IMAINTPLAN_STR-MAINTPLANISLOCKEDAGAINSTCALLS sy-vline 
WA_IMAINTPLAN_STR-LASTCHANGEDATETIME sy-vline 
WA_IMAINTPLAN_STR-LATECOMPLETIONSHIFTFACTOR sy-vline 
WA_IMAINTPLAN_STR-EARLYCOMPLETIONSHIFTFACTOR sy-vline 
WA_IMAINTPLAN_STR-LATECOMPLETIONTOLERANCEPERCENT sy-vline 
WA_IMAINTPLAN_STR-EARLYCOMPLETIONTOLERANCEPCT sy-vline 
WA_IMAINTPLAN_STR-MAINTENANCECALLHORIZONCALCTYPE sy-vline 
WA_IMAINTPLAN_STR-LOGICALOPERATOR sy-vline 
WA_IMAINTPLAN_STR-MULTIPLECOUNTERPLANSHIFTFACTOR sy-vline 
WA_IMAINTPLAN_STR-MAINTSCHEDULINGSTARTCOUNTER sy-vline 
WA_IMAINTPLAN_STR-SCHEDULINGSTARTDATE sy-vline 
WA_IMAINTPLAN_STR-SCHEDULINGSTARTTIME sy-vline 
WA_IMAINTPLAN_STR-MAINTSCHEDULINGENDCOUNTER sy-vline 
WA_IMAINTPLAN_STR-SCHEDULINGENDDATE sy-vline 
WA_IMAINTPLAN_STR-MAINTENANCELEADFLOATINDAYS sy-vline 
WA_IMAINTPLAN_STR-MAINTPLANSTARTBUFFERQUANTITY sy-vline 
WA_IMAINTPLAN_STR-MAINTPLANSTARTBUFFERUNIT sy-vline 
WA_IMAINTPLAN_STR-PRDCSSRCALLOBJCOMPLTNISRQD sy-vline 
WA_IMAINTPLAN_STR-MAINTENANCEPLANHASLONGTEXT sy-vline      INTO ld_text SEPARATED BY SPACE.

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