ABAP Select data from SAP table KLBKNZANDCAT into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM KLBKNZANDCAT
*  INTO TABLE @DATA(IT_KLBKNZANDCAT2).
*--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_KLBKNZANDCAT INDEX 1 INTO DATA(WA_KLBKNZANDCAT2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<KLBKNZANDCAT>-BBK1WHR = 1.
<KLBKNZANDCAT>-SBK1WHR = 1.
<KLBKNZANDCAT>-BBK2WHR = 1.
<KLBKNZANDCAT>-SBK2WHR = 1.
<KLBKNZANDCAT>-BBK3WHR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_KLBKNZANDCAT-SBK3WHR, sy-vline,
  WA_KLBKNZANDCAT-BBK4WHR, sy-vline,
  WA_KLBKNZANDCAT-SBK4WHR, sy-vline,
  WA_KLBKNZANDCAT-VAR1CAT, sy-vline,
  WA_KLBKNZANDCAT-VAR2CAT, sy-vline,
  WA_KLBKNZANDCAT-VAR3CAT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_KLBKNZANDCAT 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_KLBKNZANDCAT 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_KLBKNZANDCAT INTO WA_KLBKNZANDCAT.


*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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_KLBKNZANDCAT_STR, 
BBK1WHR TYPE STRING,
SBK1WHR TYPE STRING,
BBK2WHR TYPE STRING,
SBK2WHR TYPE STRING,
BBK3WHR TYPE STRING,
SBK3WHR TYPE STRING,
BBK4WHR TYPE STRING,
SBK4WHR TYPE STRING,
VAR1CAT TYPE STRING,
VAR2CAT TYPE STRING,
VAR3CAT TYPE STRING,
VAR4CAT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_KLBKNZANDCAT_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_KLBKNZANDCAT_STR-BBK1WHR sy-vline 
WA_KLBKNZANDCAT_STR-SBK1WHR sy-vline 
WA_KLBKNZANDCAT_STR-BBK2WHR sy-vline 
WA_KLBKNZANDCAT_STR-SBK2WHR sy-vline 
WA_KLBKNZANDCAT_STR-BBK3WHR sy-vline 
WA_KLBKNZANDCAT_STR-SBK3WHR sy-vline 
WA_KLBKNZANDCAT_STR-BBK4WHR sy-vline 
WA_KLBKNZANDCAT_STR-SBK4WHR sy-vline 
WA_KLBKNZANDCAT_STR-VAR1CAT sy-vline 
WA_KLBKNZANDCAT_STR-VAR2CAT sy-vline 
WA_KLBKNZANDCAT_STR-VAR3CAT sy-vline 
WA_KLBKNZANDCAT_STR-VAR4CAT sy-vline      INTO ld_text SEPARATED BY SPACE.

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