ABAP Select data from SAP table CNV_NCE_KB into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CNV_NCE_KB
*  INTO TABLE @DATA(IT_CNV_NCE_KB2).
*--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_CNV_NCE_KB INDEX 1 INTO DATA(WA_CNV_NCE_KB2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CNV_NCE_KB>-OBJECT = 1.
<CNV_NCE_KB>-TABNAME = 1.
<CNV_NCE_KB>-FIELDNAME = 1.
<CNV_NCE_KB>-ROLLNAME = 1.
<CNV_NCE_KB>-DOMNAME = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CNV_NCE_KB-TABLETYPE, sy-vline,
  WA_CNV_NCE_KB-DTELSOBJ, sy-vline,
  WA_CNV_NCE_KB-NRTAB, sy-vline,
  WA_CNV_NCE_KB-NRINTFLD, sy-vline,
  WA_CNV_NCE_KB-NREXTFLD, sy-vline,
  WA_CNV_NCE_KB-NRFLD, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CNV_NCE_KB 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_CNV_NCE_KB 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_CNV_NCE_KB INTO WA_CNV_NCE_KB.


*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 DTYPE, internal->external for field NUMBER_DTYPE
CALL FUNCTION 'CONVERSION_EXIT_DTYPE_OUTPUT'
  EXPORTING
    input =                      WA_CNV_NCE_KB-NUMBER_DTYPE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CNV_NCE_KB-NUMBER_DTYPE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ISOLA, internal->external for field LANGU
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_CNV_NCE_KB-LANGU
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CNV_NCE_KB-LANGU.
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_CNV_NCE_KB_STR, 
OBJECT TYPE STRING,
TABNAME TYPE STRING,
FIELDNAME TYPE STRING,
ROLLNAME TYPE STRING,
DOMNAME TYPE STRING,
TABLETYPE TYPE STRING,
DTELSOBJ TYPE STRING,
NRTAB TYPE STRING,
NRINTFLD TYPE STRING,
NREXTFLD TYPE STRING,
NRFLD TYPE STRING,
NRSOBJFLD TYPE STRING,
NRELEFLD TYPE STRING,
YEARIND TYPE STRING,
DOMLEN TYPE STRING,
FIELDNAME_YEAR TYPE STRING,
DOMSOBJ TYPE STRING,
NUMBER_LENGTH TYPE STRING,
NUMBER_DTYPE TYPE STRING,
LANGU TYPE STRING,
DESCRIPT TYPE STRING,
CL_GEN TYPE STRING,
TNRO_DTEL TYPE STRING,
SOBJ_MAPTAB TYPE STRING,
TNRO_MAPFLD TYPE STRING,
REAL_MAPFLD TYPE STRING,
INCLUDED TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CNV_NCE_KB_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_CNV_NCE_KB_STR-OBJECT sy-vline 
WA_CNV_NCE_KB_STR-TABNAME sy-vline 
WA_CNV_NCE_KB_STR-FIELDNAME sy-vline 
WA_CNV_NCE_KB_STR-ROLLNAME sy-vline 
WA_CNV_NCE_KB_STR-DOMNAME sy-vline 
WA_CNV_NCE_KB_STR-TABLETYPE sy-vline 
WA_CNV_NCE_KB_STR-DTELSOBJ sy-vline 
WA_CNV_NCE_KB_STR-NRTAB sy-vline 
WA_CNV_NCE_KB_STR-NRINTFLD sy-vline 
WA_CNV_NCE_KB_STR-NREXTFLD sy-vline 
WA_CNV_NCE_KB_STR-NRFLD sy-vline 
WA_CNV_NCE_KB_STR-NRSOBJFLD sy-vline 
WA_CNV_NCE_KB_STR-NRELEFLD sy-vline 
WA_CNV_NCE_KB_STR-YEARIND sy-vline 
WA_CNV_NCE_KB_STR-DOMLEN sy-vline 
WA_CNV_NCE_KB_STR-FIELDNAME_YEAR sy-vline 
WA_CNV_NCE_KB_STR-DOMSOBJ sy-vline 
WA_CNV_NCE_KB_STR-NUMBER_LENGTH sy-vline 
WA_CNV_NCE_KB_STR-NUMBER_DTYPE sy-vline 
WA_CNV_NCE_KB_STR-LANGU sy-vline 
WA_CNV_NCE_KB_STR-DESCRIPT sy-vline 
WA_CNV_NCE_KB_STR-CL_GEN sy-vline 
WA_CNV_NCE_KB_STR-TNRO_DTEL sy-vline 
WA_CNV_NCE_KB_STR-SOBJ_MAPTAB sy-vline 
WA_CNV_NCE_KB_STR-TNRO_MAPFLD sy-vline 
WA_CNV_NCE_KB_STR-REAL_MAPFLD sy-vline 
WA_CNV_NCE_KB_STR-INCLUDED sy-vline      INTO ld_text SEPARATED BY SPACE.

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