ABAP Select data from SAP table IMAINTITEM into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM IMAINTITEM
*  INTO TABLE @DATA(IT_IMAINTITEM2).
*--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_IMAINTITEM INDEX 1 INTO DATA(WA_IMAINTITEM2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<IMAINTITEM>-MANDT = 1.
<IMAINTITEM>-MAINTENANCEITEM = 1.
<IMAINTITEM>-MAINTOBJECTLOCACCTASSGMTNMBR = 1.
<IMAINTITEM>-MAINTENANCEPLANNERGROUP = 1.
<IMAINTITEM>-MAINTENANCEPLANNINGPLANT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_IMAINTITEM-BUSINESSAREA, sy-vline,
  WA_IMAINTITEM-SETTLEMENTRULEISMAINTAINED, sy-vline,
  WA_IMAINTITEM-MAINTENANCEITEMHASLONGTEXT, sy-vline,
  WA_IMAINTITEM-MAINWORKCENTERINTERNALID, sy-vline,
  WA_IMAINTITEM-WORKCENTERTYPECODE, sy-vline,
  WA_IMAINTITEM-TASKLISTTYPE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_IMAINTITEM 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_IMAINTITEM 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_IMAINTITEM INTO WA_IMAINTITEM.


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

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

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

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

*Conversion exit TPLNR, internal->external for field FUNCTIONALLOCATION
CALL FUNCTION 'CONVERSION_EXIT_TPLNR_OUTPUT'
  EXPORTING
    input =                      WA_IMAINTITEM-FUNCTIONALLOCATION
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IMAINTITEM-FUNCTIONALLOCATION.
WRITE:/ 'New Value:', ld_input.

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

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

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

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

*Conversion exit GERNR, internal->external for field SERIALNUMBER
CALL FUNCTION 'CONVERSION_EXIT_GERNR_OUTPUT'
  EXPORTING
    input =                      WA_IMAINTITEM-SERIALNUMBER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IMAINTITEM-SERIALNUMBER.
WRITE:/ 'New Value:', ld_input.

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

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

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

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

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

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

*Conversion exit MATN1, internal->external for field PRODUCT
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_IMAINTITEM-PRODUCT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IMAINTITEM-PRODUCT.
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_IMAINTITEM_STR, 
MANDT TYPE STRING,
MAINTENANCEITEM TYPE STRING,
MAINTOBJECTLOCACCTASSGMTNMBR TYPE STRING,
MAINTENANCEPLANNERGROUP TYPE STRING,
MAINTENANCEPLANNINGPLANT TYPE STRING,
BUSINESSAREA TYPE STRING,
SETTLEMENTRULEISMAINTAINED TYPE STRING,
MAINTENANCEITEMHASLONGTEXT TYPE STRING,
MAINWORKCENTERINTERNALID TYPE STRING,
WORKCENTERTYPECODE TYPE STRING,
TASKLISTTYPE TYPE STRING,
TASKLISTGROUP TYPE STRING,
TASKLISTGROUPCOUNTER TYPE STRING,
EQUIPMENT TYPE STRING,
FUNCTIONALLOCATION TYPE STRING,
ASSEMBLY TYPE STRING,
CREATIONDATE TYPE STRING,
CREATEDBYUSER TYPE STRING,
LASTCHANGEDATE TYPE STRING,
LASTCHANGEDBYUSER TYPE STRING,
MAINTENANCEITEMDESCRIPTION TYPE STRING,
MAINTENANCEPLAN TYPE STRING,
MAINTENANCEPLANITEMPOSITION TYPE STRING,
MAINTENANCESTRATEGY TYPE STRING,
MAINTENANCEPLANCATEGORY TYPE STRING,
MAINTENANCEPLANCALLOBJECT TYPE STRING,
MAINTITEMCAUSESAREDISPLAYED TYPE STRING,
MAINTITEMREASONSAREDISPLAYED TYPE STRING,
NOTIFICATIONTYPE TYPE STRING,
MAINTENANCENOTIFICATION TYPE STRING,
MAINTPRIORITYTYPE TYPE STRING,
MAINTPRIORITY TYPE STRING,
MAINTENANCEORDER TYPE STRING,
MAINTENANCEACTIVITYTYPE TYPE STRING,
MAINTENANCEORDERTYPE TYPE STRING,
SERIALNUMBER TYPE STRING,
MATERIAL TYPE STRING,
MAINTENANCEITEMOBJECTLIST TYPE STRING,
OPERATIONSYSTEMCONDITION TYPE STRING,
NUMBEROFTASKLISTEXECUTIONS TYPE STRING,
MAINTENANCEITEMISINACTIVE TYPE STRING,
OBJECTINTERNALID TYPE STRING,
MAINTOBJECTCATEGORY TYPE STRING,
SALESDOCUMENT TYPE STRING,
PURCHASEORDER TYPE STRING,
PURCHASEORDERITEM TYPE STRING,
SETTLEMENTORDER TYPE STRING,
LASTCHANGEDATETIME TYPE STRING,
MAINTPLANLASTCHANGEDATETIME TYPE STRING,
IMMEDIATERELEASEISBLOCKED TYPE STRING,
CYCLESETSEQUENCE TYPE STRING,
REFERENCEELEMENT TYPE STRING,
SERVICEDOCUMENTTYPE TYPE STRING,
SERVICECONTRACT TYPE STRING,
SERVICECONTRACTITEM TYPE STRING,
SERVICEORDERTEMPLATE TYPE STRING,
PRODUCT TYPE STRING,
SERVICEDOCUMENTPRIORITY TYPE STRING,END OF T_EKKO_STR.
DATA: WA_IMAINTITEM_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_IMAINTITEM_STR-MANDT sy-vline 
WA_IMAINTITEM_STR-MAINTENANCEITEM sy-vline 
WA_IMAINTITEM_STR-MAINTOBJECTLOCACCTASSGMTNMBR sy-vline 
WA_IMAINTITEM_STR-MAINTENANCEPLANNERGROUP sy-vline 
WA_IMAINTITEM_STR-MAINTENANCEPLANNINGPLANT sy-vline 
WA_IMAINTITEM_STR-BUSINESSAREA sy-vline 
WA_IMAINTITEM_STR-SETTLEMENTRULEISMAINTAINED sy-vline 
WA_IMAINTITEM_STR-MAINTENANCEITEMHASLONGTEXT sy-vline 
WA_IMAINTITEM_STR-MAINWORKCENTERINTERNALID sy-vline 
WA_IMAINTITEM_STR-WORKCENTERTYPECODE sy-vline 
WA_IMAINTITEM_STR-TASKLISTTYPE sy-vline 
WA_IMAINTITEM_STR-TASKLISTGROUP sy-vline 
WA_IMAINTITEM_STR-TASKLISTGROUPCOUNTER sy-vline 
WA_IMAINTITEM_STR-EQUIPMENT sy-vline 
WA_IMAINTITEM_STR-FUNCTIONALLOCATION sy-vline 
WA_IMAINTITEM_STR-ASSEMBLY sy-vline 
WA_IMAINTITEM_STR-CREATIONDATE sy-vline 
WA_IMAINTITEM_STR-CREATEDBYUSER sy-vline 
WA_IMAINTITEM_STR-LASTCHANGEDATE sy-vline 
WA_IMAINTITEM_STR-LASTCHANGEDBYUSER sy-vline 
WA_IMAINTITEM_STR-MAINTENANCEITEMDESCRIPTION sy-vline 
WA_IMAINTITEM_STR-MAINTENANCEPLAN sy-vline 
WA_IMAINTITEM_STR-MAINTENANCEPLANITEMPOSITION sy-vline 
WA_IMAINTITEM_STR-MAINTENANCESTRATEGY sy-vline 
WA_IMAINTITEM_STR-MAINTENANCEPLANCATEGORY sy-vline 
WA_IMAINTITEM_STR-MAINTENANCEPLANCALLOBJECT sy-vline 
WA_IMAINTITEM_STR-MAINTITEMCAUSESAREDISPLAYED sy-vline 
WA_IMAINTITEM_STR-MAINTITEMREASONSAREDISPLAYED sy-vline 
WA_IMAINTITEM_STR-NOTIFICATIONTYPE sy-vline 
WA_IMAINTITEM_STR-MAINTENANCENOTIFICATION sy-vline 
WA_IMAINTITEM_STR-MAINTPRIORITYTYPE sy-vline 
WA_IMAINTITEM_STR-MAINTPRIORITY sy-vline 
WA_IMAINTITEM_STR-MAINTENANCEORDER sy-vline 
WA_IMAINTITEM_STR-MAINTENANCEACTIVITYTYPE sy-vline 
WA_IMAINTITEM_STR-MAINTENANCEORDERTYPE sy-vline 
WA_IMAINTITEM_STR-SERIALNUMBER sy-vline 
WA_IMAINTITEM_STR-MATERIAL sy-vline 
WA_IMAINTITEM_STR-MAINTENANCEITEMOBJECTLIST sy-vline 
WA_IMAINTITEM_STR-OPERATIONSYSTEMCONDITION sy-vline 
WA_IMAINTITEM_STR-NUMBEROFTASKLISTEXECUTIONS sy-vline 
WA_IMAINTITEM_STR-MAINTENANCEITEMISINACTIVE sy-vline 
WA_IMAINTITEM_STR-OBJECTINTERNALID sy-vline 
WA_IMAINTITEM_STR-MAINTOBJECTCATEGORY sy-vline 
WA_IMAINTITEM_STR-SALESDOCUMENT sy-vline 
WA_IMAINTITEM_STR-PURCHASEORDER sy-vline 
WA_IMAINTITEM_STR-PURCHASEORDERITEM sy-vline 
WA_IMAINTITEM_STR-SETTLEMENTORDER sy-vline 
WA_IMAINTITEM_STR-LASTCHANGEDATETIME sy-vline 
WA_IMAINTITEM_STR-MAINTPLANLASTCHANGEDATETIME sy-vline 
WA_IMAINTITEM_STR-IMMEDIATERELEASEISBLOCKED sy-vline 
WA_IMAINTITEM_STR-CYCLESETSEQUENCE sy-vline 
WA_IMAINTITEM_STR-REFERENCEELEMENT sy-vline 
WA_IMAINTITEM_STR-SERVICEDOCUMENTTYPE sy-vline 
WA_IMAINTITEM_STR-SERVICECONTRACT sy-vline 
WA_IMAINTITEM_STR-SERVICECONTRACTITEM sy-vline 
WA_IMAINTITEM_STR-SERVICEORDERTEMPLATE sy-vline 
WA_IMAINTITEM_STR-PRODUCT sy-vline 
WA_IMAINTITEM_STR-SERVICEDOCUMENTPRIORITY sy-vline      INTO ld_text SEPARATED BY SPACE.

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