ABAP Select data from SAP table ESH_U_MAINTORCNF 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_MAINTORCNF 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_MAINTORCNF. 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_MAINTORCNF 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_MAINTORCNF TYPE STANDARD TABLE OF ESH_U_MAINTORCNF,
      WA_ESH_U_MAINTORCNF TYPE ESH_U_MAINTORCNF,
      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_MAINTORCNF> TYPE ESH_U_MAINTORCNF.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ESH_U_MAINTORCNF
*  INTO TABLE @DATA(IT_ESH_U_MAINTORCNF2).
*--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_MAINTORCNF INDEX 1 INTO DATA(WA_ESH_U_MAINTORCNF2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ESH_U_MAINTORCNF>-MANDT = 1.
<ESH_U_MAINTORCNF>-MAINTORDERCONF = 1.
<ESH_U_MAINTORCNF>-MAINTORDERCONFCNTRVALUE = 1.
<ESH_U_MAINTORCNF>-ORDERTYPE = 1.
<ESH_U_MAINTORCNF>-VARIANCEREASONCODE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ESH_U_MAINTORCNF-EQUIPMENTNAME, sy-vline,
  WA_ESH_U_MAINTORCNF-FUNCNLLOCPRIMARYLABELNAME, sy-vline,
  WA_ESH_U_MAINTORCNF-FUNCTIONALLOCATIONNAME, sy-vline,
  WA_ESH_U_MAINTORCNF-COSTCENTER, sy-vline,
  WA_ESH_U_MAINTORCNF-CONTROLLINGAREA, sy-vline,
  WA_ESH_U_MAINTORCNF-MAINTENANCEPLANNERGROUP, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ESH_U_MAINTORCNF 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_MAINTORCNF 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_MAINTORCNF INTO WA_ESH_U_MAINTORCNF.


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

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

*Conversion exit CUNIT, internal->external for field ACTUALWORKQUANTITYUNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_ESH_U_MAINTORCNF-ACTUALWORKQUANTITYUNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ESH_U_MAINTORCNF-ACTUALWORKQUANTITYUNIT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field ACTUALDURATIONUNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_ESH_U_MAINTORCNF-ACTUALDURATIONUNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ESH_U_MAINTORCNF-ACTUALDURATIONUNIT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field MAINTENANCEORDER
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_ESH_U_MAINTORCNF-MAINTENANCEORDER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ESH_U_MAINTORCNF-MAINTENANCEORDER.
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_MAINTORCNF_STR, 
MANDT TYPE STRING,
MAINTORDERCONF TYPE STRING,
MAINTORDERCONFCNTRVALUE TYPE STRING,
ORDERTYPE TYPE STRING,
VARIANCEREASONCODE TYPE STRING,
EQUIPMENTNAME TYPE STRING,
FUNCNLLOCPRIMARYLABELNAME TYPE STRING,
FUNCTIONALLOCATIONNAME TYPE STRING,
COSTCENTER TYPE STRING,
CONTROLLINGAREA TYPE STRING,
MAINTENANCEPLANNERGROUP TYPE STRING,
MAINTENANCEPLANNINGPLANT TYPE STRING,
ASSEMBLY TYPE STRING,
EQUIPMENT TYPE STRING,
WORKCENTERTEXT TYPE STRING,
WORKCENTER TYPE STRING,
PERSONNELNUMBER TYPE STRING,
PLANT TYPE STRING,
POSTINGDATE TYPE STRING,
MAINTORDERCONFIRMATIONENTRYDTE TYPE STRING,
ENTEREDBYUSER TYPE STRING,
LASTCHANGEDBYUSER TYPE STRING,
CONFIRMATIONTEXT TYPE STRING,
ACTUALWORKQUANTITY TYPE STRING,
ACTUALWORKQUANTITYUNIT TYPE STRING,
ACTIVITYTYPE TYPE STRING,
ACTUALDURATION TYPE STRING,
ACTUALDURATIONUNIT TYPE STRING,
MAINTORDEROPERATIONCOUNTER TYPE STRING,
OPENRESERVATIONSISCLEARED TYPE STRING,
MAINTENANCEORDER TYPE STRING,
ISREVERSED TYPE STRING,
COUNTER TYPE STRING,
CONFIRMATION TYPE STRING,
PLAINLONGTEXT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ESH_U_MAINTORCNF_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_MAINTORCNF_STR-MANDT sy-vline 
WA_ESH_U_MAINTORCNF_STR-MAINTORDERCONF sy-vline 
WA_ESH_U_MAINTORCNF_STR-MAINTORDERCONFCNTRVALUE sy-vline 
WA_ESH_U_MAINTORCNF_STR-ORDERTYPE sy-vline 
WA_ESH_U_MAINTORCNF_STR-VARIANCEREASONCODE sy-vline 
WA_ESH_U_MAINTORCNF_STR-EQUIPMENTNAME sy-vline 
WA_ESH_U_MAINTORCNF_STR-FUNCNLLOCPRIMARYLABELNAME sy-vline 
WA_ESH_U_MAINTORCNF_STR-FUNCTIONALLOCATIONNAME sy-vline 
WA_ESH_U_MAINTORCNF_STR-COSTCENTER sy-vline 
WA_ESH_U_MAINTORCNF_STR-CONTROLLINGAREA sy-vline 
WA_ESH_U_MAINTORCNF_STR-MAINTENANCEPLANNERGROUP sy-vline 
WA_ESH_U_MAINTORCNF_STR-MAINTENANCEPLANNINGPLANT sy-vline 
WA_ESH_U_MAINTORCNF_STR-ASSEMBLY sy-vline 
WA_ESH_U_MAINTORCNF_STR-EQUIPMENT sy-vline 
WA_ESH_U_MAINTORCNF_STR-WORKCENTERTEXT sy-vline 
WA_ESH_U_MAINTORCNF_STR-WORKCENTER sy-vline 
WA_ESH_U_MAINTORCNF_STR-PERSONNELNUMBER sy-vline 
WA_ESH_U_MAINTORCNF_STR-PLANT sy-vline 
WA_ESH_U_MAINTORCNF_STR-POSTINGDATE sy-vline 
WA_ESH_U_MAINTORCNF_STR-MAINTORDERCONFIRMATIONENTRYDTE sy-vline 
WA_ESH_U_MAINTORCNF_STR-ENTEREDBYUSER sy-vline 
WA_ESH_U_MAINTORCNF_STR-LASTCHANGEDBYUSER sy-vline 
WA_ESH_U_MAINTORCNF_STR-CONFIRMATIONTEXT sy-vline 
WA_ESH_U_MAINTORCNF_STR-ACTUALWORKQUANTITY sy-vline 
WA_ESH_U_MAINTORCNF_STR-ACTUALWORKQUANTITYUNIT sy-vline 
WA_ESH_U_MAINTORCNF_STR-ACTIVITYTYPE sy-vline 
WA_ESH_U_MAINTORCNF_STR-ACTUALDURATION sy-vline 
WA_ESH_U_MAINTORCNF_STR-ACTUALDURATIONUNIT sy-vline 
WA_ESH_U_MAINTORCNF_STR-MAINTORDEROPERATIONCOUNTER sy-vline 
WA_ESH_U_MAINTORCNF_STR-OPENRESERVATIONSISCLEARED sy-vline 
WA_ESH_U_MAINTORCNF_STR-MAINTENANCEORDER sy-vline 
WA_ESH_U_MAINTORCNF_STR-ISREVERSED sy-vline 
WA_ESH_U_MAINTORCNF_STR-COUNTER sy-vline 
WA_ESH_U_MAINTORCNF_STR-CONFIRMATION sy-vline 
WA_ESH_U_MAINTORCNF_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.