ABAP Select data from SAP table IMGENRGYEXPC into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM IMGENRGYEXPC
*  INTO TABLE @DATA(IT_IMGENRGYEXPC2).
*--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_IMGENRGYEXPC INDEX 1 INTO DATA(WA_IMGENRGYEXPC2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<IMGENRGYEXPC>-MANDT = 1.
<IMGENRGYEXPC>-MICROGENBUSINESSPARTNER = 1.
<IMGENRGYEXPC>-MICROGENCONTRACTACCOUNT = 1.
<IMGENRGYEXPC>-MICROGENCONTRACT = 1.
<IMGENRGYEXPC>-MICROGENINSTALLATION = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_IMGENRGYEXPC-MICROGENBILLPERIODVALUE, sy-vline,
  WA_IMGENRGYEXPC-MICROGENTOU, sy-vline,
  WA_IMGENRGYEXPC-MICROGENTRANSACTIONNUMBER, sy-vline,
  WA_IMGENRGYEXPC-MICROGENCONTRACTREF, sy-vline,
  WA_IMGENRGYEXPC-MICROGENALLOCATIONDATE, sy-vline,
  WA_IMGENRGYEXPC-MICROGENACTIVITYTYPE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_IMGENRGYEXPC 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_IMGENRGYEXPC 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_IMGENRGYEXPC INTO WA_IMGENRGYEXPC.


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

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

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

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

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

*Conversion exit CUNIT, internal->external for field MICROGENENERGYCREDITSUNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_IMGENRGYEXPC-MICROGENENERGYCREDITSUNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IMGENRGYEXPC-MICROGENENERGYCREDITSUNIT.
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_IMGENRGYEXPC_STR, 
MANDT TYPE STRING,
MICROGENBUSINESSPARTNER TYPE STRING,
MICROGENCONTRACTACCOUNT TYPE STRING,
MICROGENCONTRACT TYPE STRING,
MICROGENINSTALLATION TYPE STRING,
MICROGENBILLPERIODVALUE TYPE STRING,
MICROGENTOU TYPE STRING,
MICROGENTRANSACTIONNUMBER TYPE STRING,
MICROGENCONTRACTREF TYPE STRING,
MICROGENALLOCATIONDATE TYPE STRING,
MICROGENACTIVITYTYPE TYPE STRING,
MICROGENENERGYCREDITSQUANTITY TYPE STRING,
MICROGENENERGYCREDITSUNIT TYPE STRING,
MICROGENCREDITEXPIRYDATE TYPE STRING,
MICROGENEXPIRYCREDITTYPE TYPE STRING,
MCGNCNFGRDEXPRYDATE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_IMGENRGYEXPC_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_IMGENRGYEXPC_STR-MANDT sy-vline 
WA_IMGENRGYEXPC_STR-MICROGENBUSINESSPARTNER sy-vline 
WA_IMGENRGYEXPC_STR-MICROGENCONTRACTACCOUNT sy-vline 
WA_IMGENRGYEXPC_STR-MICROGENCONTRACT sy-vline 
WA_IMGENRGYEXPC_STR-MICROGENINSTALLATION sy-vline 
WA_IMGENRGYEXPC_STR-MICROGENBILLPERIODVALUE sy-vline 
WA_IMGENRGYEXPC_STR-MICROGENTOU sy-vline 
WA_IMGENRGYEXPC_STR-MICROGENTRANSACTIONNUMBER sy-vline 
WA_IMGENRGYEXPC_STR-MICROGENCONTRACTREF sy-vline 
WA_IMGENRGYEXPC_STR-MICROGENALLOCATIONDATE sy-vline 
WA_IMGENRGYEXPC_STR-MICROGENACTIVITYTYPE sy-vline 
WA_IMGENRGYEXPC_STR-MICROGENENERGYCREDITSQUANTITY sy-vline 
WA_IMGENRGYEXPC_STR-MICROGENENERGYCREDITSUNIT sy-vline 
WA_IMGENRGYEXPC_STR-MICROGENCREDITEXPIRYDATE sy-vline 
WA_IMGENRGYEXPC_STR-MICROGENEXPIRYCREDITTYPE sy-vline 
WA_IMGENRGYEXPC_STR-MCGNCNFGRDEXPRYDATE sy-vline      INTO ld_text SEPARATED BY SPACE.

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