ABAP Select data from SAP table ICUSTUHFNDB into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ICUSTUHFNDB
*  INTO TABLE @DATA(IT_ICUSTUHFNDB2).
*--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_ICUSTUHFNDB INDEX 1 INTO DATA(WA_ICUSTUHFNDB2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ICUSTUHFNDB>-MANDT = 1.
<ICUSTUHFNDB>-CUSTOMERUNIVERSALHIERARCHY = 1.
<ICUSTUHFNDB>-HIERARCHYNODE = 1.
<ICUSTUHFNDB>-CUSTHIERARCHYVALIDITYENDDATE = 1.
<ICUSTUHFNDB>-CUSTHIERARCHYVALIDITYSTARTDATE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ICUSTUHFNDB-PARENTNODE, sy-vline,
  WA_ICUSTUHFNDB-CUSTOMERUNIVERSALHIERARCHYNODE, sy-vline,
  WA_ICUSTUHFNDB-CUSTOMER, sy-vline,
  WA_ICUSTUHFNDB-HIERARCHYNODESEQUENCE, sy-vline,
  WA_ICUSTUHFNDB-NODETYPE, sy-vline,
  WA_ICUSTUHFNDB-HIERARCHYNODELEVEL, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ICUSTUHFNDB 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_ICUSTUHFNDB 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_ICUSTUHFNDB INTO WA_ICUSTUHFNDB.


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

*Conversion exit ALPHA, internal->external for field CUSTOMER
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_ICUSTUHFNDB-CUSTOMER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ICUSTUHFNDB-CUSTOMER.
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_ICUSTUHFNDB_STR, 
MANDT TYPE STRING,
CUSTOMERUNIVERSALHIERARCHY TYPE STRING,
HIERARCHYNODE TYPE STRING,
CUSTHIERARCHYVALIDITYENDDATE TYPE STRING,
CUSTHIERARCHYVALIDITYSTARTDATE TYPE STRING,
PARENTNODE TYPE STRING,
CUSTOMERUNIVERSALHIERARCHYNODE TYPE STRING,
CUSTOMER TYPE STRING,
HIERARCHYNODESEQUENCE TYPE STRING,
NODETYPE TYPE STRING,
HIERARCHYNODELEVEL TYPE STRING,
HIERARCHYTYPE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ICUSTUHFNDB_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_ICUSTUHFNDB_STR-MANDT sy-vline 
WA_ICUSTUHFNDB_STR-CUSTOMERUNIVERSALHIERARCHY sy-vline 
WA_ICUSTUHFNDB_STR-HIERARCHYNODE sy-vline 
WA_ICUSTUHFNDB_STR-CUSTHIERARCHYVALIDITYENDDATE sy-vline 
WA_ICUSTUHFNDB_STR-CUSTHIERARCHYVALIDITYSTARTDATE sy-vline 
WA_ICUSTUHFNDB_STR-PARENTNODE sy-vline 
WA_ICUSTUHFNDB_STR-CUSTOMERUNIVERSALHIERARCHYNODE sy-vline 
WA_ICUSTUHFNDB_STR-CUSTOMER sy-vline 
WA_ICUSTUHFNDB_STR-HIERARCHYNODESEQUENCE sy-vline 
WA_ICUSTUHFNDB_STR-NODETYPE sy-vline 
WA_ICUSTUHFNDB_STR-HIERARCHYNODELEVEL sy-vline 
WA_ICUSTUHFNDB_STR-HIERARCHYTYPE sy-vline      INTO ld_text SEPARATED BY SPACE.

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