ABAP Select data from SAP table ISTLUNITDATA into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ISTLUNITDATA
*  INTO TABLE @DATA(IT_ISTLUNITDATA2).
*--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_ISTLUNITDATA INDEX 1 INTO DATA(WA_ISTLUNITDATA2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ISTLUNITDATA>-MANDT = 1.
<ISTLUNITDATA>-SETTLEMENTUNITUUID = 1.
<ISTLUNITDATA>-CONTRACTAPPLICATIONUUID = 1.
<ISTLUNITDATA>-CONTRACTAPPLICATIONVERSION = 1.
<ISTLUNITDATA>-CONTRACTNUM = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ISTLUNITDATA-CONTRACTITEM, sy-vline,
  WA_ISTLUNITDATA-SETTLMTQUANTITY, sy-vline,
  WA_ISTLUNITDATA-SETTLMTQUANTITYUNIT, sy-vline,
  WA_ISTLUNITDATA-SETTLEMENTCREATEDON, sy-vline,
  WA_ISTLUNITDATA-SETTLMTCAT, sy-vline,
  WA_ISTLUNITDATA-SETTLEMENTSTATUSOBJECT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ISTLUNITDATA 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_ISTLUNITDATA 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_ISTLUNITDATA INTO WA_ISTLUNITDATA.


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

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

*Conversion exit TSTLC, internal->external for field SETTLEMENTCREATEDON
CALL FUNCTION 'CONVERSION_EXIT_TSTLC_OUTPUT'
  EXPORTING
    input =                      WA_ISTLUNITDATA-SETTLEMENTCREATEDON
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ISTLUNITDATA-SETTLEMENTCREATEDON.
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_ISTLUNITDATA_STR, 
MANDT TYPE STRING,
SETTLEMENTUNITUUID TYPE STRING,
CONTRACTAPPLICATIONUUID TYPE STRING,
CONTRACTAPPLICATIONVERSION TYPE STRING,
CONTRACTNUM TYPE STRING,
CONTRACTITEM TYPE STRING,
SETTLMTQUANTITY TYPE STRING,
SETTLMTQUANTITYUNIT TYPE STRING,
SETTLEMENTCREATEDON TYPE STRING,
SETTLMTCAT TYPE STRING,
SETTLEMENTSTATUSOBJECT TYPE STRING,
CONTRACTQTYCANCELLATIONUUID TYPE STRING,
SETTLEMENTTYPE TYPE STRING,
STATUSCODE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ISTLUNITDATA_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_ISTLUNITDATA_STR-MANDT sy-vline 
WA_ISTLUNITDATA_STR-SETTLEMENTUNITUUID sy-vline 
WA_ISTLUNITDATA_STR-CONTRACTAPPLICATIONUUID sy-vline 
WA_ISTLUNITDATA_STR-CONTRACTAPPLICATIONVERSION sy-vline 
WA_ISTLUNITDATA_STR-CONTRACTNUM sy-vline 
WA_ISTLUNITDATA_STR-CONTRACTITEM sy-vline 
WA_ISTLUNITDATA_STR-SETTLMTQUANTITY sy-vline 
WA_ISTLUNITDATA_STR-SETTLMTQUANTITYUNIT sy-vline 
WA_ISTLUNITDATA_STR-SETTLEMENTCREATEDON sy-vline 
WA_ISTLUNITDATA_STR-SETTLMTCAT sy-vline 
WA_ISTLUNITDATA_STR-SETTLEMENTSTATUSOBJECT sy-vline 
WA_ISTLUNITDATA_STR-CONTRACTQTYCANCELLATIONUUID sy-vline 
WA_ISTLUNITDATA_STR-SETTLEMENTTYPE sy-vline 
WA_ISTLUNITDATA_STR-STATUSCODE sy-vline      INTO ld_text SEPARATED BY SPACE.

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