ABAP Select data from SAP table IMAINTPLANCYCLE into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM IMAINTPLANCYCLE
*  INTO TABLE @DATA(IT_IMAINTPLANCYCLE2).
*--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_IMAINTPLANCYCLE INDEX 1 INTO DATA(WA_IMAINTPLANCYCLE2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<IMAINTPLANCYCLE>-MANDT = 1.
<IMAINTPLANCYCLE>-MAINTENANCEPLAN = 1.
<IMAINTPLANCYCLE>-MAINTENANCEPLANCYCLE = 1.
<IMAINTPLANCYCLE>-COMPARISONOPERATOR = 1.
<IMAINTPLANCYCLE>-MAINTPLANCYCRCRRCINTERVALQTY = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_IMAINTPLANCYCLE-MAINTPLANCYCRCRRCINTERVALUNIT, sy-vline,
  WA_IMAINTPLANCYCLE-MAINTPLANCYCLEDESC, sy-vline,
  WA_IMAINTPLANCYCLE-LANGUAGE, sy-vline,
  WA_IMAINTPLANCYCLE-MEASURINGPOINT, sy-vline,
  WA_IMAINTPLANCYCLE-MAINTPLANCYCLESTARTOFFSETVALUE, sy-vline,
  WA_IMAINTPLANCYCLE-MAINTCYCLENEXTPLNDCNTRRDNG, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_IMAINTPLANCYCLE 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_IMAINTPLANCYCLE 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_IMAINTPLANCYCLE INTO WA_IMAINTPLANCYCLE.


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

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

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

*Conversion exit ALPHA, internal->external for field MEASURINGPOINT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_IMAINTPLANCYCLE-MEASURINGPOINT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IMAINTPLANCYCLE-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_IMAINTPLANCYCLE_STR, 
MANDT TYPE STRING,
MAINTENANCEPLAN TYPE STRING,
MAINTENANCEPLANCYCLE TYPE STRING,
COMPARISONOPERATOR TYPE STRING,
MAINTPLANCYCRCRRCINTERVALQTY TYPE STRING,
MAINTPLANCYCRCRRCINTERVALUNIT TYPE STRING,
MAINTPLANCYCLEDESC TYPE STRING,
LANGUAGE TYPE STRING,
MEASURINGPOINT TYPE STRING,
MAINTPLANCYCLESTARTOFFSETVALUE TYPE STRING,
MAINTCYCLENEXTPLNDCNTRRDNG TYPE STRING,
MAINTENANCEPLANCYCLEISINACTIVE TYPE STRING,
CYCLESETSEQUENCE TYPE STRING,
CYCLESETSEQUENCEREPEATFACTOR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_IMAINTPLANCYCLE_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_IMAINTPLANCYCLE_STR-MANDT sy-vline 
WA_IMAINTPLANCYCLE_STR-MAINTENANCEPLAN sy-vline 
WA_IMAINTPLANCYCLE_STR-MAINTENANCEPLANCYCLE sy-vline 
WA_IMAINTPLANCYCLE_STR-COMPARISONOPERATOR sy-vline 
WA_IMAINTPLANCYCLE_STR-MAINTPLANCYCRCRRCINTERVALQTY sy-vline 
WA_IMAINTPLANCYCLE_STR-MAINTPLANCYCRCRRCINTERVALUNIT sy-vline 
WA_IMAINTPLANCYCLE_STR-MAINTPLANCYCLEDESC sy-vline 
WA_IMAINTPLANCYCLE_STR-LANGUAGE sy-vline 
WA_IMAINTPLANCYCLE_STR-MEASURINGPOINT sy-vline 
WA_IMAINTPLANCYCLE_STR-MAINTPLANCYCLESTARTOFFSETVALUE sy-vline 
WA_IMAINTPLANCYCLE_STR-MAINTCYCLENEXTPLNDCNTRRDNG sy-vline 
WA_IMAINTPLANCYCLE_STR-MAINTENANCEPLANCYCLEISINACTIVE sy-vline 
WA_IMAINTPLANCYCLE_STR-CYCLESETSEQUENCE sy-vline 
WA_IMAINTPLANCYCLE_STR-CYCLESETSEQUENCEREPEATFACTOR sy-vline      INTO ld_text SEPARATED BY SPACE.

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