ABAP Select data from SAP table IMAINTCHECKLIST into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM IMAINTCHECKLIST
*  INTO TABLE @DATA(IT_IMAINTCHECKLIST2).
*--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_IMAINTCHECKLIST INDEX 1 INTO DATA(WA_IMAINTCHECKLIST2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<IMAINTCHECKLIST>-MANDT = 1.
<IMAINTCHECKLIST>-MAINTENANCECHECKLISTTYPE = 1.
<IMAINTCHECKLIST>-MAINTENANCECHECKLIST = 1.
<IMAINTCHECKLIST>-MAINTENANCEBUSINESSOBJECTTYPE = 1.
<IMAINTCHECKLIST>-MAINTENANCEBUSINESSOBJECT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_IMAINTCHECKLIST-MAINTBUSINESSSUBOBJECTTYPE, sy-vline,
  WA_IMAINTCHECKLIST-MAINTENANCEBUSINESSSUBOBJECT, sy-vline,
  WA_IMAINTCHECKLIST-MAINTCHECKLISTTEMPLATETYPE, sy-vline,
  WA_IMAINTCHECKLIST-MAINTENANCECHECKLISTTEMPLATE, sy-vline,
  WA_IMAINTCHECKLIST-EQUIPMENT, sy-vline,
  WA_IMAINTCHECKLIST-FUNCTIONALLOCATION, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_IMAINTCHECKLIST 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_IMAINTCHECKLIST 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_IMAINTCHECKLIST INTO WA_IMAINTCHECKLIST.


*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 EQUIPMENT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_IMAINTCHECKLIST-EQUIPMENT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IMAINTCHECKLIST-EQUIPMENT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit TPLNR, internal->external for field FUNCTIONALLOCATION
CALL FUNCTION 'CONVERSION_EXIT_TPLNR_OUTPUT'
  EXPORTING
    input =                      WA_IMAINTCHECKLIST-FUNCTIONALLOCATION
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IMAINTCHECKLIST-FUNCTIONALLOCATION.
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_IMAINTCHECKLIST_STR, 
MANDT TYPE STRING,
MAINTENANCECHECKLISTTYPE TYPE STRING,
MAINTENANCECHECKLIST TYPE STRING,
MAINTENANCEBUSINESSOBJECTTYPE TYPE STRING,
MAINTENANCEBUSINESSOBJECT TYPE STRING,
MAINTBUSINESSSUBOBJECTTYPE TYPE STRING,
MAINTENANCEBUSINESSSUBOBJECT TYPE STRING,
MAINTCHECKLISTTEMPLATETYPE TYPE STRING,
MAINTENANCECHECKLISTTEMPLATE TYPE STRING,
EQUIPMENT TYPE STRING,
FUNCTIONALLOCATION TYPE STRING,
MAINTCHKLSTADDLINFORMATIONTEXT TYPE STRING,
MAINCHECKLISTISDEACTIVATED TYPE STRING,END OF T_EKKO_STR.
DATA: WA_IMAINTCHECKLIST_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_IMAINTCHECKLIST_STR-MANDT sy-vline 
WA_IMAINTCHECKLIST_STR-MAINTENANCECHECKLISTTYPE sy-vline 
WA_IMAINTCHECKLIST_STR-MAINTENANCECHECKLIST sy-vline 
WA_IMAINTCHECKLIST_STR-MAINTENANCEBUSINESSOBJECTTYPE sy-vline 
WA_IMAINTCHECKLIST_STR-MAINTENANCEBUSINESSOBJECT sy-vline 
WA_IMAINTCHECKLIST_STR-MAINTBUSINESSSUBOBJECTTYPE sy-vline 
WA_IMAINTCHECKLIST_STR-MAINTENANCEBUSINESSSUBOBJECT sy-vline 
WA_IMAINTCHECKLIST_STR-MAINTCHECKLISTTEMPLATETYPE sy-vline 
WA_IMAINTCHECKLIST_STR-MAINTENANCECHECKLISTTEMPLATE sy-vline 
WA_IMAINTCHECKLIST_STR-EQUIPMENT sy-vline 
WA_IMAINTCHECKLIST_STR-FUNCTIONALLOCATION sy-vline 
WA_IMAINTCHECKLIST_STR-MAINTCHKLSTADDLINFORMATIONTEXT sy-vline 
WA_IMAINTCHECKLIST_STR-MAINCHECKLISTISDEACTIVATED sy-vline      INTO ld_text SEPARATED BY SPACE.

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