ABAP Select data from SAP table NCHGRECREFROU into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM NCHGRECREFROU
*  INTO TABLE @DATA(IT_NCHGRECREFROU2).
*--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_NCHGRECREFROU INDEX 1 INTO DATA(WA_NCHGRECREFROU2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<NCHGRECREFROU>-MANDT = 1.
<NCHGRECREFROU>-CHANGERECORDREFERENCEUUID = 1.
<NCHGRECREFROU>-BILLOFOPERATIONSGROUP = 1.
<NCHGRECREFROU>-BILLOFOPERATIONSTYPE = 1.
<NCHGRECREFROU>-BILLOFOPERATIONSVARIANT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_NCHGRECREFROU-BILLOFOPERATIONSVERSION, sy-vline,
  WA_NCHGRECREFROU-MATERIAL, sy-vline,
  WA_NCHGRECREFROU-CHANGERECORDTYPE, sy-vline,
  WA_NCHGRECREFROU-CHANGERECORDUUID, sy-vline,
  WA_NCHGRECREFROU-CHANGERECORDREFERENCETYPE, sy-vline,
  WA_NCHGRECREFROU-PARENTCHANGERECORDREFUUID, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_NCHGRECREFROU 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_NCHGRECREFROU 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_NCHGRECREFROU INTO WA_NCHGRECREFROU.


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

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

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

*Conversion exit MATN1, internal->external for field MATERIAL
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_NCHGRECREFROU-MATERIAL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_NCHGRECREFROU-MATERIAL.
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_NCHGRECREFROU_STR, 
MANDT TYPE STRING,
CHANGERECORDREFERENCEUUID TYPE STRING,
BILLOFOPERATIONSGROUP TYPE STRING,
BILLOFOPERATIONSTYPE TYPE STRING,
BILLOFOPERATIONSVARIANT TYPE STRING,
BILLOFOPERATIONSVERSION TYPE STRING,
MATERIAL TYPE STRING,
CHANGERECORDTYPE TYPE STRING,
CHANGERECORDUUID TYPE STRING,
CHANGERECORDREFERENCETYPE TYPE STRING,
PARENTCHANGERECORDREFUUID TYPE STRING,
CHANGERECORDITEMRELEVANCE TYPE STRING,
BOOVERSIONSTATUSTEXT TYPE STRING,
CHANGERECORDREFERENCE TYPE STRING,
CREATEDBYUSER TYPE STRING,
CREATIONDATETIME TYPE STRING,
CREATIONDATE TYPE STRING,
LASTCHANGEDBYUSER TYPE STRING,
LASTCHANGEDATETIME TYPE STRING,
LASTCHANGEDATE TYPE STRING,
PLANT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_NCHGRECREFROU_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_NCHGRECREFROU_STR-MANDT sy-vline 
WA_NCHGRECREFROU_STR-CHANGERECORDREFERENCEUUID sy-vline 
WA_NCHGRECREFROU_STR-BILLOFOPERATIONSGROUP sy-vline 
WA_NCHGRECREFROU_STR-BILLOFOPERATIONSTYPE sy-vline 
WA_NCHGRECREFROU_STR-BILLOFOPERATIONSVARIANT sy-vline 
WA_NCHGRECREFROU_STR-BILLOFOPERATIONSVERSION sy-vline 
WA_NCHGRECREFROU_STR-MATERIAL sy-vline 
WA_NCHGRECREFROU_STR-CHANGERECORDTYPE sy-vline 
WA_NCHGRECREFROU_STR-CHANGERECORDUUID sy-vline 
WA_NCHGRECREFROU_STR-CHANGERECORDREFERENCETYPE sy-vline 
WA_NCHGRECREFROU_STR-PARENTCHANGERECORDREFUUID sy-vline 
WA_NCHGRECREFROU_STR-CHANGERECORDITEMRELEVANCE sy-vline 
WA_NCHGRECREFROU_STR-BOOVERSIONSTATUSTEXT sy-vline 
WA_NCHGRECREFROU_STR-CHANGERECORDREFERENCE sy-vline 
WA_NCHGRECREFROU_STR-CREATEDBYUSER sy-vline 
WA_NCHGRECREFROU_STR-CREATIONDATETIME sy-vline 
WA_NCHGRECREFROU_STR-CREATIONDATE sy-vline 
WA_NCHGRECREFROU_STR-LASTCHANGEDBYUSER sy-vline 
WA_NCHGRECREFROU_STR-LASTCHANGEDATETIME sy-vline 
WA_NCHGRECREFROU_STR-LASTCHANGEDATE sy-vline 
WA_NCHGRECREFROU_STR-PLANT sy-vline      INTO ld_text SEPARATED BY SPACE.

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