ABAP Select data from SAP table IMAINTENANCECALL into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM IMAINTENANCECALL
*  INTO TABLE @DATA(IT_IMAINTENANCECALL2).
*--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_IMAINTENANCECALL INDEX 1 INTO DATA(WA_IMAINTENANCECALL2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<IMAINTENANCECALL>-MANDT = 1.
<IMAINTENANCECALL>-MAINTENANCEPLAN = 1.
<IMAINTENANCECALL>-MAINTENANCECALL = 1.
<IMAINTENANCECALL>-MAINTENANCEITEM = 1.
<IMAINTENANCECALL>-MAINTENANCEORDER = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_IMAINTENANCECALL-MAINTENANCENOTIFICATION, sy-vline,
  WA_IMAINTENANCECALL-MAINTCALLHORIZONISNOTREACHED, sy-vline,
  WA_IMAINTENANCECALL-SCHEDULINGSTATUS, sy-vline,
  WA_IMAINTENANCECALL-COMPLETIONDATE, sy-vline,
  WA_IMAINTENANCECALL-COMPLETIONTIME, sy-vline,
  WA_IMAINTENANCECALL-PLANNEDSTARTDATE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_IMAINTENANCECALL 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_IMAINTENANCECALL 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_IMAINTENANCECALL INTO WA_IMAINTENANCECALL.


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

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

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

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

*Conversion exit ALPHA, internal->external for field SERVICEORDER
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_IMAINTENANCECALL-SERVICEORDER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IMAINTENANCECALL-SERVICEORDER.
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_IMAINTENANCECALL_STR, 
MANDT TYPE STRING,
MAINTENANCEPLAN TYPE STRING,
MAINTENANCECALL TYPE STRING,
MAINTENANCEITEM TYPE STRING,
MAINTENANCEORDER TYPE STRING,
MAINTENANCENOTIFICATION TYPE STRING,
MAINTCALLHORIZONISNOTREACHED TYPE STRING,
SCHEDULINGSTATUS TYPE STRING,
COMPLETIONDATE TYPE STRING,
COMPLETIONTIME TYPE STRING,
PLANNEDSTARTDATE TYPE STRING,
RELEASEDBYUSERNAME TYPE STRING,
SERVICEORDER TYPE STRING,END OF T_EKKO_STR.
DATA: WA_IMAINTENANCECALL_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_IMAINTENANCECALL_STR-MANDT sy-vline 
WA_IMAINTENANCECALL_STR-MAINTENANCEPLAN sy-vline 
WA_IMAINTENANCECALL_STR-MAINTENANCECALL sy-vline 
WA_IMAINTENANCECALL_STR-MAINTENANCEITEM sy-vline 
WA_IMAINTENANCECALL_STR-MAINTENANCEORDER sy-vline 
WA_IMAINTENANCECALL_STR-MAINTENANCENOTIFICATION sy-vline 
WA_IMAINTENANCECALL_STR-MAINTCALLHORIZONISNOTREACHED sy-vline 
WA_IMAINTENANCECALL_STR-SCHEDULINGSTATUS sy-vline 
WA_IMAINTENANCECALL_STR-COMPLETIONDATE sy-vline 
WA_IMAINTENANCECALL_STR-COMPLETIONTIME sy-vline 
WA_IMAINTENANCECALL_STR-PLANNEDSTARTDATE sy-vline 
WA_IMAINTENANCECALL_STR-RELEASEDBYUSERNAME sy-vline 
WA_IMAINTENANCECALL_STR-SERVICEORDER sy-vline      INTO ld_text SEPARATED BY SPACE.

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