ABAP Select data from SAP table IFLDRESVNDET into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM IFLDRESVNDET
*  INTO TABLE @DATA(IT_IFLDRESVNDET2).
*--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_IFLDRESVNDET INDEX 1 INTO DATA(WA_IFLDRESVNDET2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<IFLDRESVNDET>-MANDT = 1.
<IFLDRESVNDET>-MAINTENANCEORDER = 1.
<IFLDRESVNDET>-PRODUCT = 1.
<IFLDRESVNDET>-PLANT = 1.
<IFLDRESVNDET>-RESERVATIONITEM = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_IFLDRESVNDET-RESERVATION, sy-vline,
  WA_IFLDRESVNDET-REQUIREDQUANTITY, sy-vline,
  WA_IFLDRESVNDET-BASEUNIT, sy-vline,
  WA_IFLDRESVNDET-WITHDRAWNQUANTITY, sy-vline,
  WA_IFLDRESVNDET-OPERATION, sy-vline,
  WA_IFLDRESVNDET-FLDLOGSSUPPLYPROCESS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_IFLDRESVNDET 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_IFLDRESVNDET 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_IFLDRESVNDET INTO WA_IFLDRESVNDET.


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

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

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

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

*Conversion exit CUNIT, internal->external for field ORDERQUANTITYUNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_IFLDRESVNDET-ORDERQUANTITYUNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IFLDRESVNDET-ORDERQUANTITYUNIT.
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_IFLDRESVNDET_STR, 
MANDT TYPE STRING,
MAINTENANCEORDER TYPE STRING,
PRODUCT TYPE STRING,
PLANT TYPE STRING,
RESERVATIONITEM TYPE STRING,
RESERVATION TYPE STRING,
REQUIREDQUANTITY TYPE STRING,
BASEUNIT TYPE STRING,
WITHDRAWNQUANTITY TYPE STRING,
OPERATION TYPE STRING,
FLDLOGSSUPPLYPROCESS TYPE STRING,
PURCHASEREQUISITION TYPE STRING,
PURCHASEREQUISITIONITEM TYPE STRING,
PURCHASEORDER TYPE STRING,
PURCHASEORDERITEM TYPE STRING,
PURCHASEORDERQTY TYPE STRING,
ORDERQUANTITYUNIT TYPE STRING,
FLDLOGSREMOTEQUANTITY TYPE STRING,END OF T_EKKO_STR.
DATA: WA_IFLDRESVNDET_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_IFLDRESVNDET_STR-MANDT sy-vline 
WA_IFLDRESVNDET_STR-MAINTENANCEORDER sy-vline 
WA_IFLDRESVNDET_STR-PRODUCT sy-vline 
WA_IFLDRESVNDET_STR-PLANT sy-vline 
WA_IFLDRESVNDET_STR-RESERVATIONITEM sy-vline 
WA_IFLDRESVNDET_STR-RESERVATION sy-vline 
WA_IFLDRESVNDET_STR-REQUIREDQUANTITY sy-vline 
WA_IFLDRESVNDET_STR-BASEUNIT sy-vline 
WA_IFLDRESVNDET_STR-WITHDRAWNQUANTITY sy-vline 
WA_IFLDRESVNDET_STR-OPERATION sy-vline 
WA_IFLDRESVNDET_STR-FLDLOGSSUPPLYPROCESS sy-vline 
WA_IFLDRESVNDET_STR-PURCHASEREQUISITION sy-vline 
WA_IFLDRESVNDET_STR-PURCHASEREQUISITIONITEM sy-vline 
WA_IFLDRESVNDET_STR-PURCHASEORDER sy-vline 
WA_IFLDRESVNDET_STR-PURCHASEORDERITEM sy-vline 
WA_IFLDRESVNDET_STR-PURCHASEORDERQTY sy-vline 
WA_IFLDRESVNDET_STR-ORDERQUANTITYUNIT sy-vline 
WA_IFLDRESVNDET_STR-FLDLOGSREMOTEQUANTITY sy-vline      INTO ld_text SEPARATED BY SPACE.

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