ABAP Select data from SAP table IMAINTCYCLE into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM IMAINTCYCLE
*  INTO TABLE @DATA(IT_IMAINTCYCLE2).
*--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_IMAINTCYCLE INDEX 1 INTO DATA(WA_IMAINTCYCLE2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<IMAINTCYCLE>-MANDT = 1.
<IMAINTCYCLE>-MAINTENANCEPLAN = 1.
<IMAINTCYCLE>-NUMBEROFCONTROLTABLEENTITIES = 1.
<IMAINTCYCLE>-COMPARISONOPERATOR = 1.
<IMAINTCYCLE>-MAINTPLANCYCLEINTERVALCOUNT = 1.

ENDLOOP.

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

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


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

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

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

*Conversion exit ALPHA, internal->external for field MEASURINGPOINT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_IMAINTCYCLE-MEASURINGPOINT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IMAINTCYCLE-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_IMAINTCYCLE_STR, 
MANDT TYPE STRING,
MAINTENANCEPLAN TYPE STRING,
NUMBEROFCONTROLTABLEENTITIES TYPE STRING,
COMPARISONOPERATOR TYPE STRING,
MAINTPLANCYCLEINTERVALCOUNT TYPE STRING,
MAINTENANCETASKPERFORMANCEUNIT TYPE STRING,
MAINTPLANCYCLEDESC TYPE STRING,
LANGUAGE TYPE STRING,
MEASURINGPOINT TYPE STRING,
MAINTPLANCYCLESTARTOFFSETVALUE TYPE STRING,
MAINTCYCLENEXTPLNDCNTRRDNG TYPE STRING,
EVENTSCHEDULINGISINACTIVE TYPE STRING,
CYCLESETSEQUENCE TYPE STRING,
CYCLESETSEQUENCEREPEATFACTOR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_IMAINTCYCLE_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_IMAINTCYCLE_STR-MANDT sy-vline 
WA_IMAINTCYCLE_STR-MAINTENANCEPLAN sy-vline 
WA_IMAINTCYCLE_STR-NUMBEROFCONTROLTABLEENTITIES sy-vline 
WA_IMAINTCYCLE_STR-COMPARISONOPERATOR sy-vline 
WA_IMAINTCYCLE_STR-MAINTPLANCYCLEINTERVALCOUNT sy-vline 
WA_IMAINTCYCLE_STR-MAINTENANCETASKPERFORMANCEUNIT sy-vline 
WA_IMAINTCYCLE_STR-MAINTPLANCYCLEDESC sy-vline 
WA_IMAINTCYCLE_STR-LANGUAGE sy-vline 
WA_IMAINTCYCLE_STR-MEASURINGPOINT sy-vline 
WA_IMAINTCYCLE_STR-MAINTPLANCYCLESTARTOFFSETVALUE sy-vline 
WA_IMAINTCYCLE_STR-MAINTCYCLENEXTPLNDCNTRRDNG sy-vline 
WA_IMAINTCYCLE_STR-EVENTSCHEDULINGISINACTIVE sy-vline 
WA_IMAINTCYCLE_STR-CYCLESETSEQUENCE sy-vline 
WA_IMAINTCYCLE_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.