ABAP Select data from SAP table ISTLUNITSIDATA into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ISTLUNITSIDATA
*  INTO TABLE @DATA(IT_ISTLUNITSIDATA2).
*--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_ISTLUNITSIDATA INDEX 1 INTO DATA(WA_ISTLUNITSIDATA2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ISTLUNITSIDATA>-MANDT = 1.
<ISTLUNITSIDATA>-SETTLEMENTDOCHEADERUUID = 1.
<ISTLUNITSIDATA>-FEEFRAMEWORKFEEID = 1.
<ISTLUNITSIDATA>-FEEVERSION = 1.
<ISTLUNITSIDATA>-SEQUENCENUMBER = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ISTLUNITSIDATA-FEEDOCUMENTLEVEL, sy-vline,
  WA_ISTLUNITSIDATA-TRADINGCONTRACTNUMBER, sy-vline,
  WA_ISTLUNITSIDATA-TRADINGCONTRACTITEM, sy-vline,
  WA_ISTLUNITSIDATA-REFERENCEDOCUMENTFISCALYEAR, sy-vline,
  WA_ISTLUNITSIDATA-FEEFRAMEWORKFEENAME, sy-vline,
ENDLOOP.
   
*Add any further fields from structure WA_ISTLUNITSIDATA 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_ISTLUNITSIDATA 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_ISTLUNITSIDATA INTO WA_ISTLUNITSIDATA.


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

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

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

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

*Conversion exit GJAHR, internal->external for field REFERENCEDOCUMENTFISCALYEAR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_ISTLUNITSIDATA-REFERENCEDOCUMENTFISCALYEAR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ISTLUNITSIDATA-REFERENCEDOCUMENTFISCALYEAR.
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_ISTLUNITSIDATA_STR, 
MANDT TYPE STRING,
SETTLEMENTDOCHEADERUUID TYPE STRING,
FEEFRAMEWORKFEEID TYPE STRING,
FEEVERSION TYPE STRING,
SEQUENCENUMBER TYPE STRING,
FEEDOCUMENTLEVEL TYPE STRING,
TRADINGCONTRACTNUMBER TYPE STRING,
TRADINGCONTRACTITEM TYPE STRING,
REFERENCEDOCUMENTFISCALYEAR TYPE STRING,
FEEFRAMEWORKFEENAME TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ISTLUNITSIDATA_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_ISTLUNITSIDATA_STR-MANDT sy-vline 
WA_ISTLUNITSIDATA_STR-SETTLEMENTDOCHEADERUUID sy-vline 
WA_ISTLUNITSIDATA_STR-FEEFRAMEWORKFEEID sy-vline 
WA_ISTLUNITSIDATA_STR-FEEVERSION sy-vline 
WA_ISTLUNITSIDATA_STR-SEQUENCENUMBER sy-vline 
WA_ISTLUNITSIDATA_STR-FEEDOCUMENTLEVEL sy-vline 
WA_ISTLUNITSIDATA_STR-TRADINGCONTRACTNUMBER sy-vline 
WA_ISTLUNITSIDATA_STR-TRADINGCONTRACTITEM sy-vline 
WA_ISTLUNITSIDATA_STR-REFERENCEDOCUMENTFISCALYEAR sy-vline 
WA_ISTLUNITSIDATA_STR-FEEFRAMEWORKFEENAME sy-vline      INTO ld_text SEPARATED BY SPACE.

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