ABAP Select data from SAP table ISMAINTENANCETASKLISTTP_D into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ISMAINTENANCETASKLISTTP_D
*  INTO TABLE @DATA(IT_ISMAINTENANCETASKLISTTP_D2).
*--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_ISMAINTENANCETASKLISTTP_D INDEX 1 INTO DATA(WA_ISMAINTENANCETASKLISTTP_D2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ISMAINTENANCETASKLISTTP_D>-TASKLISTTYPE = 1.
<ISMAINTENANCETASKLISTTP_D>-TASKLISTGROUP = 1.
<ISMAINTENANCETASKLISTTP_D>-TASKLISTGROUPCOUNTER = 1.
<ISMAINTENANCETASKLISTTP_D>-TASKLISTDESC = 1.
<ISMAINTENANCETASKLISTTP_D>-MAINTENANCESTRATEGY = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ISMAINTENANCETASKLISTTP_D-PLANT, sy-vline,
  WA_ISMAINTENANCETASKLISTTP_D-RESPONSIBLEPLANNERGROUP, sy-vline,
  WA_ISMAINTENANCETASKLISTTP_D-WORKCENTERTYPECODE, sy-vline,
  WA_ISMAINTENANCETASKLISTTP_D-WORKCENTERINTERNALID, sy-vline,
  WA_ISMAINTENANCETASKLISTTP_D-TASKLISTSTATUS, sy-vline,
  WA_ISMAINTENANCETASKLISTTP_D-VALIDITYSTARTDATE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ISMAINTENANCETASKLISTTP_D 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_ISMAINTENANCETASKLISTTP_D 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_ISMAINTENANCETASKLISTTP_D INTO WA_ISMAINTENANCETASKLISTTP_D.


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

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

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

*Conversion exit MATN1, internal->external for field ASSEMBLY
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_ISMAINTENANCETASKLISTTP_D-ASSEMBLY
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ISMAINTENANCETASKLISTTP_D-ASSEMBLY.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field EQUIPMENT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_ISMAINTENANCETASKLISTTP_D-EQUIPMENT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ISMAINTENANCETASKLISTTP_D-EQUIPMENT.
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_ISMAINTENANCETASKLISTTP_D_STR, 
TASKLISTTYPE TYPE STRING,
TASKLISTGROUP TYPE STRING,
TASKLISTGROUPCOUNTER TYPE STRING,
TASKLISTDESC TYPE STRING,
MAINTENANCESTRATEGY TYPE STRING,
PLANT TYPE STRING,
RESPONSIBLEPLANNERGROUP TYPE STRING,
WORKCENTERTYPECODE TYPE STRING,
WORKCENTERINTERNALID TYPE STRING,
TASKLISTSTATUS TYPE STRING,
VALIDITYSTARTDATE TYPE STRING,
VALIDITYENDDATE TYPE STRING,
CHANGENUMBER TYPE STRING,
ASSEMBLY TYPE STRING,
OPERATIONSYSTEMCONDITION TYPE STRING,
REFERENCEELEMENT TYPE STRING,
TASKLISTUSAGE TYPE STRING,
INSPSUBSETFIELDCOMBINATION TYPE STRING,
INSPEXTERNALNUMBERINGOFVALUES TYPE STRING,
TECHOBJISEQUIPORFUNCNLLOC TYPE STRING,
TECHNICALOBJECT TYPE STRING,
TASKLISTOBJECTKEY TYPE STRING,
SAFETYRELEVANTOBJECT TYPE STRING,
ISDELETED TYPE STRING,
EQUIPMENT TYPE STRING,
FUNCTIONALLOCATIONLABELNAME TYPE STRING,
TASKLISTVERSIONCOUNTER TYPE STRING,
LASTCHANGEDATE TYPE STRING,
LASTCHANGEDBYUSER TYPE STRING,
CREATEDBYUSER TYPE STRING,
CREATIONDATE TYPE STRING,
BILLOFOPERATIONSUSAGE TYPE STRING,
MAINTENANCEPLANNINGPLANT TYPE STRING,
TASKLISTISHIERARCHICAL TYPE STRING,
ISMARKEDFORDELETION TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ISMAINTENANCETASKLISTTP_D_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_ISMAINTENANCETASKLISTTP_D_STR-TASKLISTTYPE sy-vline 
WA_ISMAINTENANCETASKLISTTP_D_STR-TASKLISTGROUP sy-vline 
WA_ISMAINTENANCETASKLISTTP_D_STR-TASKLISTGROUPCOUNTER sy-vline 
WA_ISMAINTENANCETASKLISTTP_D_STR-TASKLISTDESC sy-vline 
WA_ISMAINTENANCETASKLISTTP_D_STR-MAINTENANCESTRATEGY sy-vline 
WA_ISMAINTENANCETASKLISTTP_D_STR-PLANT sy-vline 
WA_ISMAINTENANCETASKLISTTP_D_STR-RESPONSIBLEPLANNERGROUP sy-vline 
WA_ISMAINTENANCETASKLISTTP_D_STR-WORKCENTERTYPECODE sy-vline 
WA_ISMAINTENANCETASKLISTTP_D_STR-WORKCENTERINTERNALID sy-vline 
WA_ISMAINTENANCETASKLISTTP_D_STR-TASKLISTSTATUS sy-vline 
WA_ISMAINTENANCETASKLISTTP_D_STR-VALIDITYSTARTDATE sy-vline 
WA_ISMAINTENANCETASKLISTTP_D_STR-VALIDITYENDDATE sy-vline 
WA_ISMAINTENANCETASKLISTTP_D_STR-CHANGENUMBER sy-vline 
WA_ISMAINTENANCETASKLISTTP_D_STR-ASSEMBLY sy-vline 
WA_ISMAINTENANCETASKLISTTP_D_STR-OPERATIONSYSTEMCONDITION sy-vline 
WA_ISMAINTENANCETASKLISTTP_D_STR-REFERENCEELEMENT sy-vline 
WA_ISMAINTENANCETASKLISTTP_D_STR-TASKLISTUSAGE sy-vline 
WA_ISMAINTENANCETASKLISTTP_D_STR-INSPSUBSETFIELDCOMBINATION sy-vline 
WA_ISMAINTENANCETASKLISTTP_D_STR-INSPEXTERNALNUMBERINGOFVALUES sy-vline 
WA_ISMAINTENANCETASKLISTTP_D_STR-TECHOBJISEQUIPORFUNCNLLOC sy-vline 
WA_ISMAINTENANCETASKLISTTP_D_STR-TECHNICALOBJECT sy-vline 
WA_ISMAINTENANCETASKLISTTP_D_STR-TASKLISTOBJECTKEY sy-vline 
WA_ISMAINTENANCETASKLISTTP_D_STR-SAFETYRELEVANTOBJECT sy-vline 
WA_ISMAINTENANCETASKLISTTP_D_STR-ISDELETED sy-vline 
WA_ISMAINTENANCETASKLISTTP_D_STR-EQUIPMENT sy-vline 
WA_ISMAINTENANCETASKLISTTP_D_STR-FUNCTIONALLOCATIONLABELNAME sy-vline 
WA_ISMAINTENANCETASKLISTTP_D_STR-TASKLISTVERSIONCOUNTER sy-vline 
WA_ISMAINTENANCETASKLISTTP_D_STR-LASTCHANGEDATE sy-vline 
WA_ISMAINTENANCETASKLISTTP_D_STR-LASTCHANGEDBYUSER sy-vline 
WA_ISMAINTENANCETASKLISTTP_D_STR-CREATEDBYUSER sy-vline 
WA_ISMAINTENANCETASKLISTTP_D_STR-CREATIONDATE sy-vline 
WA_ISMAINTENANCETASKLISTTP_D_STR-BILLOFOPERATIONSUSAGE sy-vline 
WA_ISMAINTENANCETASKLISTTP_D_STR-MAINTENANCEPLANNINGPLANT sy-vline 
WA_ISMAINTENANCETASKLISTTP_D_STR-TASKLISTISHIERARCHICAL sy-vline 
WA_ISMAINTENANCETASKLISTTP_D_STR-ISMARKEDFORDELETION sy-vline      INTO ld_text SEPARATED BY SPACE.

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