ABAP Select data from SAP table IEMTRRDNGUNITRL into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM IEMTRRDNGUNITRL
*  INTO TABLE @DATA(IT_IEMTRRDNGUNITRL2).
*--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_IEMTRRDNGUNITRL INDEX 1 INTO DATA(WA_IEMTRRDNGUNITRL2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<IEMTRRDNGUNITRL>-MANDT = 1.
<IEMTRRDNGUNITRL>-UTILITIESINSTALLATION = 1.
<IEMTRRDNGUNITRL>-SCHEDULEDMETERREADINGDATE = 1.
<IEMTRRDNGUNITRL>-UTILITIESLOGICALREGISTERNUMBER = 1.
<IEMTRRDNGUNITRL>-METERREADINGUNIT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_IEMTRRDNGUNITRL-UTILITIESREGISTER, sy-vline,
  WA_IEMTRRDNGUNITRL-EQUIPMENT, sy-vline,
  WA_IEMTRRDNGUNITRL-METERREADINGREASON, sy-vline,
  WA_IEMTRRDNGUNITRL-UTILITIESRATECATEGORY, sy-vline,
  WA_IEMTRRDNGUNITRL-MTRRDNGUNITSCHEDDATE, sy-vline,
  WA_IEMTRRDNGUNITRL-UTILITIESBILLINGCLASS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_IEMTRRDNGUNITRL 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_IEMTRRDNGUNITRL 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_IEMTRRDNGUNITRL INTO WA_IEMTRRDNGUNITRL.


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

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

*Conversion exit ALPHA, internal->external for field METERREADINGDOCUMENT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_IEMTRRDNGUNITRL-METERREADINGDOCUMENT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IEMTRRDNGUNITRL-METERREADINGDOCUMENT.
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_IEMTRRDNGUNITRL_STR, 
MANDT TYPE STRING,
UTILITIESINSTALLATION TYPE STRING,
SCHEDULEDMETERREADINGDATE TYPE STRING,
UTILITIESLOGICALREGISTERNUMBER TYPE STRING,
METERREADINGUNIT TYPE STRING,
UTILITIESREGISTER TYPE STRING,
EQUIPMENT TYPE STRING,
METERREADINGREASON TYPE STRING,
UTILITIESRATECATEGORY TYPE STRING,
MTRRDNGUNITSCHEDDATE TYPE STRING,
UTILITIESBILLINGCLASS TYPE STRING,
UTILITIESPORTION TYPE STRING,
MTRRDNGUNITSCHEDULERECORDDATE TYPE STRING,
DIVISION TYPE STRING,
AUTHORIZATIONGROUP TYPE STRING,
UTILSBILLGBLOCKREASON TYPE STRING,
METERREADINGSTATUS TYPE STRING,
METERREADINGDOCUMENT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_IEMTRRDNGUNITRL_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_IEMTRRDNGUNITRL_STR-MANDT sy-vline 
WA_IEMTRRDNGUNITRL_STR-UTILITIESINSTALLATION sy-vline 
WA_IEMTRRDNGUNITRL_STR-SCHEDULEDMETERREADINGDATE sy-vline 
WA_IEMTRRDNGUNITRL_STR-UTILITIESLOGICALREGISTERNUMBER sy-vline 
WA_IEMTRRDNGUNITRL_STR-METERREADINGUNIT sy-vline 
WA_IEMTRRDNGUNITRL_STR-UTILITIESREGISTER sy-vline 
WA_IEMTRRDNGUNITRL_STR-EQUIPMENT sy-vline 
WA_IEMTRRDNGUNITRL_STR-METERREADINGREASON sy-vline 
WA_IEMTRRDNGUNITRL_STR-UTILITIESRATECATEGORY sy-vline 
WA_IEMTRRDNGUNITRL_STR-MTRRDNGUNITSCHEDDATE sy-vline 
WA_IEMTRRDNGUNITRL_STR-UTILITIESBILLINGCLASS sy-vline 
WA_IEMTRRDNGUNITRL_STR-UTILITIESPORTION sy-vline 
WA_IEMTRRDNGUNITRL_STR-MTRRDNGUNITSCHEDULERECORDDATE sy-vline 
WA_IEMTRRDNGUNITRL_STR-DIVISION sy-vline 
WA_IEMTRRDNGUNITRL_STR-AUTHORIZATIONGROUP sy-vline 
WA_IEMTRRDNGUNITRL_STR-UTILSBILLGBLOCKREASON sy-vline 
WA_IEMTRRDNGUNITRL_STR-METERREADINGSTATUS sy-vline 
WA_IEMTRRDNGUNITRL_STR-METERREADINGDOCUMENT sy-vline      INTO ld_text SEPARATED BY SPACE.

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