ABAP Select data from SAP table ESH_U_MAINTPLAN into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ESH_U_MAINTPLAN
*  INTO TABLE @DATA(IT_ESH_U_MAINTPLAN2).
*--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_ESH_U_MAINTPLAN INDEX 1 INTO DATA(WA_ESH_U_MAINTPLAN2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ESH_U_MAINTPLAN>-MANDT = 1.
<ESH_U_MAINTPLAN>-MAINTENANCEPLAN = 1.
<ESH_U_MAINTPLAN>-PLAINLONGTEXT = 1.
<ESH_U_MAINTPLAN>-NUMBEROFMAINTENANCEITEMS = 1.
<ESH_U_MAINTPLAN>-FUNCTIONALLOCATION = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ESH_U_MAINTPLAN-MAINTENANCEPLANNERGROUP, sy-vline,
  WA_ESH_U_MAINTPLAN-MAINTENANCELEADFLOATINDAYS, sy-vline,
  WA_ESH_U_MAINTPLAN-SCHEDULINGSTARTDATE, sy-vline,
  WA_ESH_U_MAINTPLAN-SCHEDULINGENDDATE, sy-vline,
  WA_ESH_U_MAINTPLAN-MAINTPLANSTARTCNTRREADINGVALUE, sy-vline,
  WA_ESH_U_MAINTPLAN-MAINTPLANENDCNTRREADINGVALUE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ESH_U_MAINTPLAN 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_ESH_U_MAINTPLAN 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_ESH_U_MAINTPLAN INTO WA_ESH_U_MAINTPLAN.


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

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

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

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

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

*Conversion exit ALPHA, internal->external for field MAINTENANCEORDER
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_ESH_U_MAINTPLAN-MAINTENANCEORDER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ESH_U_MAINTPLAN-MAINTENANCEORDER.
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_ESH_U_MAINTPLAN_STR, 
MANDT TYPE STRING,
MAINTENANCEPLAN TYPE STRING,
PLAINLONGTEXT TYPE STRING,
NUMBEROFMAINTENANCEITEMS TYPE STRING,
FUNCTIONALLOCATION TYPE STRING,
MAINTENANCEPLANNERGROUP TYPE STRING,
MAINTENANCELEADFLOATINDAYS TYPE STRING,
SCHEDULINGSTARTDATE TYPE STRING,
SCHEDULINGENDDATE TYPE STRING,
MAINTPLANSTARTCNTRREADINGVALUE TYPE STRING,
MAINTPLANENDCNTRREADINGVALUE TYPE STRING,
EARLYCOMPLETIONTOLERANCEPCT TYPE STRING,
LATECOMPLETIONTOLERANCEPERCENT TYPE STRING,
EARLYCOMPLETIONSHIFTINPERCENT TYPE STRING,
LATECOMPLETIONSHIFTINPERCENT TYPE STRING,
SCHEDULINGDURATIONUNIT TYPE STRING,
MAINTPLANFREEDEFINEDATTRIB TYPE STRING,
BASICSTARTDATE TYPE STRING,
MAINTENANCEPLANDESC TYPE STRING,
CALLHORIZONINDAYS TYPE STRING,
CALLHORIZONPERCENT TYPE STRING,
MAINTPLANSCHEDGINDICATOR TYPE STRING,
MAINTPLANSCHEDGINDDESC TYPE STRING,
CYCLEMODIFICATIONRATIO TYPE STRING,
EQUIPMENT TYPE STRING,
MAINTENANCESTRATEGY TYPE STRING,
LASTCHANGEDBYUSER TYPE STRING,
CREATEDBYUSER TYPE STRING,
MAINTENANCEPLANCATEGORY TYPE STRING,
MAINTENANCEPLANCALLOBJECT TYPE STRING,
MAINTENANCESTRATEGYDESC TYPE STRING,
MAINTENANCEPLANCATEGORYDESC TYPE STRING,
MAINTENANCEITEMDESCRIPTION TYPE STRING,
MAINTPLANCYCLEDESC TYPE STRING,
FUNCNLLOCPRIMARYLABELNAME TYPE STRING,
FACTORYCALENDARNAME TYPE STRING,
EQUIPMENTNAME TYPE STRING,
MAINTENANCEPLANNINGPLANT TYPE STRING,
AUTHORIZATIONGROUP TYPE STRING,
CONTROLLINGAREA TYPE STRING,
COSTCENTER TYPE STRING,
MAINTENANCEPLANT TYPE STRING,
MAINTENANCEORDER TYPE STRING,
MAINTENANCECALL TYPE STRING,
CHARCVALUE TYPE STRING,
CHARCFROMNUMERICVALUE TYPE STRING,
CHARCTONUMERICVALUE TYPE STRING,
CLASSTYPE TYPE STRING,
CLASS TYPE STRING,
CHARACTERISTIC TYPE STRING,
CLASSDESCRIPTION TYPE STRING,
CHARCDESCRIPTION TYPE STRING,
CHARCVALUEDESCRIPTION TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ESH_U_MAINTPLAN_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_ESH_U_MAINTPLAN_STR-MANDT sy-vline 
WA_ESH_U_MAINTPLAN_STR-MAINTENANCEPLAN sy-vline 
WA_ESH_U_MAINTPLAN_STR-PLAINLONGTEXT sy-vline 
WA_ESH_U_MAINTPLAN_STR-NUMBEROFMAINTENANCEITEMS sy-vline 
WA_ESH_U_MAINTPLAN_STR-FUNCTIONALLOCATION sy-vline 
WA_ESH_U_MAINTPLAN_STR-MAINTENANCEPLANNERGROUP sy-vline 
WA_ESH_U_MAINTPLAN_STR-MAINTENANCELEADFLOATINDAYS sy-vline 
WA_ESH_U_MAINTPLAN_STR-SCHEDULINGSTARTDATE sy-vline 
WA_ESH_U_MAINTPLAN_STR-SCHEDULINGENDDATE sy-vline 
WA_ESH_U_MAINTPLAN_STR-MAINTPLANSTARTCNTRREADINGVALUE sy-vline 
WA_ESH_U_MAINTPLAN_STR-MAINTPLANENDCNTRREADINGVALUE sy-vline 
WA_ESH_U_MAINTPLAN_STR-EARLYCOMPLETIONTOLERANCEPCT sy-vline 
WA_ESH_U_MAINTPLAN_STR-LATECOMPLETIONTOLERANCEPERCENT sy-vline 
WA_ESH_U_MAINTPLAN_STR-EARLYCOMPLETIONSHIFTINPERCENT sy-vline 
WA_ESH_U_MAINTPLAN_STR-LATECOMPLETIONSHIFTINPERCENT sy-vline 
WA_ESH_U_MAINTPLAN_STR-SCHEDULINGDURATIONUNIT sy-vline 
WA_ESH_U_MAINTPLAN_STR-MAINTPLANFREEDEFINEDATTRIB sy-vline 
WA_ESH_U_MAINTPLAN_STR-BASICSTARTDATE sy-vline 
WA_ESH_U_MAINTPLAN_STR-MAINTENANCEPLANDESC sy-vline 
WA_ESH_U_MAINTPLAN_STR-CALLHORIZONINDAYS sy-vline 
WA_ESH_U_MAINTPLAN_STR-CALLHORIZONPERCENT sy-vline 
WA_ESH_U_MAINTPLAN_STR-MAINTPLANSCHEDGINDICATOR sy-vline 
WA_ESH_U_MAINTPLAN_STR-MAINTPLANSCHEDGINDDESC sy-vline 
WA_ESH_U_MAINTPLAN_STR-CYCLEMODIFICATIONRATIO sy-vline 
WA_ESH_U_MAINTPLAN_STR-EQUIPMENT sy-vline 
WA_ESH_U_MAINTPLAN_STR-MAINTENANCESTRATEGY sy-vline 
WA_ESH_U_MAINTPLAN_STR-LASTCHANGEDBYUSER sy-vline 
WA_ESH_U_MAINTPLAN_STR-CREATEDBYUSER sy-vline 
WA_ESH_U_MAINTPLAN_STR-MAINTENANCEPLANCATEGORY sy-vline 
WA_ESH_U_MAINTPLAN_STR-MAINTENANCEPLANCALLOBJECT sy-vline 
WA_ESH_U_MAINTPLAN_STR-MAINTENANCESTRATEGYDESC sy-vline 
WA_ESH_U_MAINTPLAN_STR-MAINTENANCEPLANCATEGORYDESC sy-vline 
WA_ESH_U_MAINTPLAN_STR-MAINTENANCEITEMDESCRIPTION sy-vline 
WA_ESH_U_MAINTPLAN_STR-MAINTPLANCYCLEDESC sy-vline 
WA_ESH_U_MAINTPLAN_STR-FUNCNLLOCPRIMARYLABELNAME sy-vline 
WA_ESH_U_MAINTPLAN_STR-FACTORYCALENDARNAME sy-vline 
WA_ESH_U_MAINTPLAN_STR-EQUIPMENTNAME sy-vline 
WA_ESH_U_MAINTPLAN_STR-MAINTENANCEPLANNINGPLANT sy-vline 
WA_ESH_U_MAINTPLAN_STR-AUTHORIZATIONGROUP sy-vline 
WA_ESH_U_MAINTPLAN_STR-CONTROLLINGAREA sy-vline 
WA_ESH_U_MAINTPLAN_STR-COSTCENTER sy-vline 
WA_ESH_U_MAINTPLAN_STR-MAINTENANCEPLANT sy-vline 
WA_ESH_U_MAINTPLAN_STR-MAINTENANCEORDER sy-vline 
WA_ESH_U_MAINTPLAN_STR-MAINTENANCECALL sy-vline 
WA_ESH_U_MAINTPLAN_STR-CHARCVALUE sy-vline 
WA_ESH_U_MAINTPLAN_STR-CHARCFROMNUMERICVALUE sy-vline 
WA_ESH_U_MAINTPLAN_STR-CHARCTONUMERICVALUE sy-vline 
WA_ESH_U_MAINTPLAN_STR-CLASSTYPE sy-vline 
WA_ESH_U_MAINTPLAN_STR-CLASS sy-vline 
WA_ESH_U_MAINTPLAN_STR-CHARACTERISTIC sy-vline 
WA_ESH_U_MAINTPLAN_STR-CLASSDESCRIPTION sy-vline 
WA_ESH_U_MAINTPLAN_STR-CHARCDESCRIPTION sy-vline 
WA_ESH_U_MAINTPLAN_STR-CHARCVALUEDESCRIPTION sy-vline      INTO ld_text SEPARATED BY SPACE.

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