ABAP Select data from SAP table NGCS_CLASSIFICATION_DATA_UPD 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_UPD 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_UPD. 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_UPD 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_UPD TYPE STANDARD TABLE OF NGCS_CLASSIFICATION_DATA_UPD,
      WA_NGCS_CLASSIFICATION_DATA_UPD TYPE NGCS_CLASSIFICATION_DATA_UPD,
      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_UPD> TYPE NGCS_CLASSIFICATION_DATA_UPD.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM NGCS_CLASSIFICATION_DATA_UPD
*  INTO TABLE @DATA(IT_NGCS_CLASSIFICATION_DATA_UPD2).
*--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_UPD INDEX 1 INTO DATA(WA_NGCS_CLASSIFICATION_DATA_UPD2).


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

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

ENDLOOP.

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

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


*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_UPD-CHANGENUMBER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_NGCS_CLASSIFICATION_DATA_UPD-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_UPD_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,
OBJECT_STATE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_NGCS_CLASSIFICATION_DATA_UPD_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_UPD_STR-CLASSINTERNALID sy-vline 
WA_NGCS_CLASSIFICATION_DATA_UPD_STR-CLASS sy-vline 
WA_NGCS_CLASSIFICATION_DATA_UPD_STR-CLASSTYPE sy-vline 
WA_NGCS_CLASSIFICATION_DATA_UPD_STR-CLFNSTATUS sy-vline 
WA_NGCS_CLASSIFICATION_DATA_UPD_STR-CLFNSTATUSDESCRIPTION sy-vline 
WA_NGCS_CLASSIFICATION_DATA_UPD_STR-CLASSPOSITIONNUMBER sy-vline 
WA_NGCS_CLASSIFICATION_DATA_UPD_STR-CLASSISSTANDARDCLASS sy-vline 
WA_NGCS_CLASSIFICATION_DATA_UPD_STR-CHANGENUMBER sy-vline 
WA_NGCS_CLASSIFICATION_DATA_UPD_STR-VALIDITYSTARTDATE sy-vline 
WA_NGCS_CLASSIFICATION_DATA_UPD_STR-VALIDITYENDDATE sy-vline 
WA_NGCS_CLASSIFICATION_DATA_UPD_STR-ISDELETED sy-vline 
WA_NGCS_CLASSIFICATION_DATA_UPD_STR-LASTCHANGEDATETIME sy-vline 
WA_NGCS_CLASSIFICATION_DATA_UPD_STR-OBJECT_STATE sy-vline      INTO ld_text SEPARATED BY SPACE.

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