ABAP Select data from SAP table NGCS_CLASSIFICATION_DATA into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM NGCS_CLASSIFICATION_DATA
*  INTO TABLE @DATA(IT_NGCS_CLASSIFICATION_DATA2).
*--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_NGCS_CLASSIFICATION_DATA INDEX 1 INTO DATA(WA_NGCS_CLASSIFICATION_DATA2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<NGCS_CLASSIFICATION_DATA>-CLASSINTERNALID = 1.
<NGCS_CLASSIFICATION_DATA>-CLASS = 1.
<NGCS_CLASSIFICATION_DATA>-CLASSTYPE = 1.
<NGCS_CLASSIFICATION_DATA>-CLFNSTATUS = 1.
<NGCS_CLASSIFICATION_DATA>-CLFNSTATUSDESCRIPTION = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_NGCS_CLASSIFICATION_DATA-CLASSPOSITIONNUMBER, sy-vline,
  WA_NGCS_CLASSIFICATION_DATA-CLASSISSTANDARDCLASS, sy-vline,
  WA_NGCS_CLASSIFICATION_DATA-CHANGENUMBER, sy-vline,
  WA_NGCS_CLASSIFICATION_DATA-VALIDITYSTARTDATE, sy-vline,
  WA_NGCS_CLASSIFICATION_DATA-VALIDITYENDDATE, sy-vline,
  WA_NGCS_CLASSIFICATION_DATA-ISDELETED, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_NGCS_CLASSIFICATION_DATA 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_NGCS_CLASSIFICATION_DATA 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_NGCS_CLASSIFICATION_DATA INTO WA_NGCS_CLASSIFICATION_DATA.


*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 CHANGENUMBER
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_NGCS_CLASSIFICATION_DATA-CHANGENUMBER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_NGCS_CLASSIFICATION_DATA-CHANGENUMBER.
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_NGCS_CLASSIFICATION_DATA_STR, 
CLASSINTERNALID TYPE STRING,
CLASS TYPE STRING,
CLASSTYPE TYPE STRING,
CLFNSTATUS TYPE STRING,
CLFNSTATUSDESCRIPTION TYPE STRING,
CLASSPOSITIONNUMBER TYPE STRING,
CLASSISSTANDARDCLASS TYPE STRING,
CHANGENUMBER TYPE STRING,
VALIDITYSTARTDATE TYPE STRING,
VALIDITYENDDATE TYPE STRING,
ISDELETED TYPE STRING,
LASTCHANGEDATETIME TYPE STRING,END OF T_EKKO_STR.
DATA: WA_NGCS_CLASSIFICATION_DATA_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_NGCS_CLASSIFICATION_DATA_STR-CLASSINTERNALID sy-vline 
WA_NGCS_CLASSIFICATION_DATA_STR-CLASS sy-vline 
WA_NGCS_CLASSIFICATION_DATA_STR-CLASSTYPE sy-vline 
WA_NGCS_CLASSIFICATION_DATA_STR-CLFNSTATUS sy-vline 
WA_NGCS_CLASSIFICATION_DATA_STR-CLFNSTATUSDESCRIPTION sy-vline 
WA_NGCS_CLASSIFICATION_DATA_STR-CLASSPOSITIONNUMBER sy-vline 
WA_NGCS_CLASSIFICATION_DATA_STR-CLASSISSTANDARDCLASS sy-vline 
WA_NGCS_CLASSIFICATION_DATA_STR-CHANGENUMBER sy-vline 
WA_NGCS_CLASSIFICATION_DATA_STR-VALIDITYSTARTDATE sy-vline 
WA_NGCS_CLASSIFICATION_DATA_STR-VALIDITYENDDATE sy-vline 
WA_NGCS_CLASSIFICATION_DATA_STR-ISDELETED sy-vline 
WA_NGCS_CLASSIFICATION_DATA_STR-LASTCHANGEDATETIME sy-vline      INTO ld_text SEPARATED BY SPACE.

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