ABAP Select data from SAP table ESH_U_MAINTITEM into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ESH_U_MAINTITEM
*  INTO TABLE @DATA(IT_ESH_U_MAINTITEM2).
*--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_ESH_U_MAINTITEM INDEX 1 INTO DATA(WA_ESH_U_MAINTITEM2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ESH_U_MAINTITEM>-MANDT = 1.
<ESH_U_MAINTITEM>-MAINTENANCEITEM = 1.
<ESH_U_MAINTITEM>-FUNCTIONALLOCATION = 1.
<ESH_U_MAINTITEM>-EQUIPMENTNAME = 1.
<ESH_U_MAINTITEM>-OPERATIONSYSTEMCONDITIONTEXT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ESH_U_MAINTITEM-WORKCENTER, sy-vline,
  WA_ESH_U_MAINTITEM-MAINWORKCENTERPLANT, sy-vline,
  WA_ESH_U_MAINTITEM-FUNCNLLOCPRIMARYLABELNAME, sy-vline,
  WA_ESH_U_MAINTITEM-FUNCLOCLABEL, sy-vline,
  WA_ESH_U_MAINTITEM-FUNCTIONALLOCATIONNAME, sy-vline,
  WA_ESH_U_MAINTITEM-TASKLISTGROUPCOUNTER, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ESH_U_MAINTITEM 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_ESH_U_MAINTITEM 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_ESH_U_MAINTITEM INTO WA_ESH_U_MAINTITEM.


*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_ESH_U_MAINTITEM-MAINTENANCEITEM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ESH_U_MAINTITEM-MAINTENANCEITEM.
WRITE:/ 'New Value:', ld_input.

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

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

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

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

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

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

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

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

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

*Conversion exit ALPHA, internal->external for field COSTCENTER
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_ESH_U_MAINTITEM-COSTCENTER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ESH_U_MAINTITEM-COSTCENTER.
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_ESH_U_MAINTITEM_STR, 
MANDT TYPE STRING,
MAINTENANCEITEM TYPE STRING,
FUNCTIONALLOCATION TYPE STRING,
EQUIPMENTNAME TYPE STRING,
OPERATIONSYSTEMCONDITIONTEXT TYPE STRING,
WORKCENTER TYPE STRING,
MAINWORKCENTERPLANT TYPE STRING,
FUNCNLLOCPRIMARYLABELNAME TYPE STRING,
FUNCLOCLABEL TYPE STRING,
FUNCTIONALLOCATIONNAME TYPE STRING,
TASKLISTGROUPCOUNTER TYPE STRING,
TASKLISTGROUP TYPE STRING,
TASKLISTTYPE TYPE STRING,
MAINTOBJECTCATEGORY TYPE STRING,
OPERATIONSYSTEMCONDITION TYPE STRING,
MATERIAL TYPE STRING,
MAINTENANCEACTIVITYTYPE TYPE STRING,
MAINTENANCEORDER TYPE STRING,
MAINTPRIORITY TYPE STRING,
MAINTENANCENOTIFICATION TYPE STRING,
MAINTENANCEPLAN TYPE STRING,
MAINTENANCEITEMDESCRIPTION TYPE STRING,
LASTCHANGEDBYUSER TYPE STRING,
CREATEDBYUSER TYPE STRING,
ASSEMBLY TYPE STRING,
EQUIPMENT TYPE STRING,
MAINTENANCEPLANNINGPLANT TYPE STRING,
MAINTENANCEPLANNERGROUP TYPE STRING,
MAINTENANCESTRATEGY TYPE STRING,
MAINTENANCEPLANCATEGORY TYPE STRING,
MAINTENANCEACTIVITYTYPENAME TYPE STRING,
NOTIFICATIONTEXT TYPE STRING,
MAINTENANCEPLANNERGROUPNAME TYPE STRING,
MAINTENANCESTRATEGYDESC TYPE STRING,
TASKLISTDESC TYPE STRING,
AUTHORIZATIONGROUPEQ TYPE STRING,
AUTHORIZATIONGROUPFL TYPE STRING,
CONTROLLINGAREA TYPE STRING,
COSTCENTER TYPE STRING,
MAINTENANCEPLANT TYPE STRING,
MAINTENANCEPLANCALLOBJECT TYPE STRING,
PLAINLONGTEXT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ESH_U_MAINTITEM_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_ESH_U_MAINTITEM_STR-MANDT sy-vline 
WA_ESH_U_MAINTITEM_STR-MAINTENANCEITEM sy-vline 
WA_ESH_U_MAINTITEM_STR-FUNCTIONALLOCATION sy-vline 
WA_ESH_U_MAINTITEM_STR-EQUIPMENTNAME sy-vline 
WA_ESH_U_MAINTITEM_STR-OPERATIONSYSTEMCONDITIONTEXT sy-vline 
WA_ESH_U_MAINTITEM_STR-WORKCENTER sy-vline 
WA_ESH_U_MAINTITEM_STR-MAINWORKCENTERPLANT sy-vline 
WA_ESH_U_MAINTITEM_STR-FUNCNLLOCPRIMARYLABELNAME sy-vline 
WA_ESH_U_MAINTITEM_STR-FUNCLOCLABEL sy-vline 
WA_ESH_U_MAINTITEM_STR-FUNCTIONALLOCATIONNAME sy-vline 
WA_ESH_U_MAINTITEM_STR-TASKLISTGROUPCOUNTER sy-vline 
WA_ESH_U_MAINTITEM_STR-TASKLISTGROUP sy-vline 
WA_ESH_U_MAINTITEM_STR-TASKLISTTYPE sy-vline 
WA_ESH_U_MAINTITEM_STR-MAINTOBJECTCATEGORY sy-vline 
WA_ESH_U_MAINTITEM_STR-OPERATIONSYSTEMCONDITION sy-vline 
WA_ESH_U_MAINTITEM_STR-MATERIAL sy-vline 
WA_ESH_U_MAINTITEM_STR-MAINTENANCEACTIVITYTYPE sy-vline 
WA_ESH_U_MAINTITEM_STR-MAINTENANCEORDER sy-vline 
WA_ESH_U_MAINTITEM_STR-MAINTPRIORITY sy-vline 
WA_ESH_U_MAINTITEM_STR-MAINTENANCENOTIFICATION sy-vline 
WA_ESH_U_MAINTITEM_STR-MAINTENANCEPLAN sy-vline 
WA_ESH_U_MAINTITEM_STR-MAINTENANCEITEMDESCRIPTION sy-vline 
WA_ESH_U_MAINTITEM_STR-LASTCHANGEDBYUSER sy-vline 
WA_ESH_U_MAINTITEM_STR-CREATEDBYUSER sy-vline 
WA_ESH_U_MAINTITEM_STR-ASSEMBLY sy-vline 
WA_ESH_U_MAINTITEM_STR-EQUIPMENT sy-vline 
WA_ESH_U_MAINTITEM_STR-MAINTENANCEPLANNINGPLANT sy-vline 
WA_ESH_U_MAINTITEM_STR-MAINTENANCEPLANNERGROUP sy-vline 
WA_ESH_U_MAINTITEM_STR-MAINTENANCESTRATEGY sy-vline 
WA_ESH_U_MAINTITEM_STR-MAINTENANCEPLANCATEGORY sy-vline 
WA_ESH_U_MAINTITEM_STR-MAINTENANCEACTIVITYTYPENAME sy-vline 
WA_ESH_U_MAINTITEM_STR-NOTIFICATIONTEXT sy-vline 
WA_ESH_U_MAINTITEM_STR-MAINTENANCEPLANNERGROUPNAME sy-vline 
WA_ESH_U_MAINTITEM_STR-MAINTENANCESTRATEGYDESC sy-vline 
WA_ESH_U_MAINTITEM_STR-TASKLISTDESC sy-vline 
WA_ESH_U_MAINTITEM_STR-AUTHORIZATIONGROUPEQ sy-vline 
WA_ESH_U_MAINTITEM_STR-AUTHORIZATIONGROUPFL sy-vline 
WA_ESH_U_MAINTITEM_STR-CONTROLLINGAREA sy-vline 
WA_ESH_U_MAINTITEM_STR-COSTCENTER sy-vline 
WA_ESH_U_MAINTITEM_STR-MAINTENANCEPLANT sy-vline 
WA_ESH_U_MAINTITEM_STR-MAINTENANCEPLANCALLOBJECT sy-vline 
WA_ESH_U_MAINTITEM_STR-PLAINLONGTEXT sy-vline      INTO ld_text SEPARATED BY SPACE.

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