ABAP Select data from SAP table LTR2_KB_S_DISP_CONDITION_PREV into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP LTR2_KB_S_DISP_CONDITION_PREV 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 LTR2_KB_S_DISP_CONDITION_PREV. 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 LTR2_KB_S_DISP_CONDITION_PREV 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_LTR2_KB_S_DISP_CONDITION_PREV TYPE STANDARD TABLE OF LTR2_KB_S_DISP_CONDITION_PREV,
      WA_LTR2_KB_S_DISP_CONDITION_PREV TYPE LTR2_KB_S_DISP_CONDITION_PREV,
      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: <LTR2_KB_S_DISP_CONDITION_PREV> TYPE LTR2_KB_S_DISP_CONDITION_PREV.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_LTR2_KB_S_DISP_CONDITION_PREV.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM LTR2_KB_S_DISP_CONDITION_PREV
  INTO TABLE IT_LTR2_KB_S_DISP_CONDITION_PREV.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM LTR2_KB_S_DISP_CONDITION_PREV
*  INTO TABLE @DATA(IT_LTR2_KB_S_DISP_CONDITION_PREV2).
*--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_LTR2_KB_S_DISP_CONDITION_PREV INDEX 1 INTO DATA(WA_LTR2_KB_S_DISP_CONDITION_PREV2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_LTR2_KB_S_DISP_CONDITION_PREV ASSIGNING <LTR2_KB_S_DISP_CONDITION_PREV>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<LTR2_KB_S_DISP_CONDITION_PREV>-VALUE1 = 1.
<LTR2_KB_S_DISP_CONDITION_PREV>-VALUE2 = 1.
<LTR2_KB_S_DISP_CONDITION_PREV>-VALUE3 = 1.
<LTR2_KB_S_DISP_CONDITION_PREV>-VALUE4 = 1.
<LTR2_KB_S_DISP_CONDITION_PREV>-VALUE5 = 1.

ENDLOOP.

LOOP AT IT_LTR2_KB_S_DISP_CONDITION_PREV INTO WA_LTR2_KB_S_DISP_CONDITION_PREV.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_LTR2_KB_S_DISP_CONDITION_PREV-VALUE6, sy-vline,
  WA_LTR2_KB_S_DISP_CONDITION_PREV-VALUE7, sy-vline,
  WA_LTR2_KB_S_DISP_CONDITION_PREV-VALUE8, sy-vline,
  WA_LTR2_KB_S_DISP_CONDITION_PREV-VALUE9, sy-vline,
  WA_LTR2_KB_S_DISP_CONDITION_PREV-VALUE10, sy-vline,
  WA_LTR2_KB_S_DISP_CONDITION_PREV-VALUE11, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_LTR2_KB_S_DISP_CONDITION_PREV 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_LTR2_KB_S_DISP_CONDITION_PREV 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_LTR2_KB_S_DISP_CONDITION_PREV INTO WA_LTR2_KB_S_DISP_CONDITION_PREV.


*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_LTR2_KB_S_DISP_CONDITION_PREV_STR, 
VALUE1 TYPE STRING,
VALUE2 TYPE STRING,
VALUE3 TYPE STRING,
VALUE4 TYPE STRING,
VALUE5 TYPE STRING,
VALUE6 TYPE STRING,
VALUE7 TYPE STRING,
VALUE8 TYPE STRING,
VALUE9 TYPE STRING,
VALUE10 TYPE STRING,
VALUE11 TYPE STRING,
VALUE12 TYPE STRING,
VALUE13 TYPE STRING,
VALUE14 TYPE STRING,
VALUE15 TYPE STRING,
VALUE16 TYPE STRING,
VALUE17 TYPE STRING,
VALUE18 TYPE STRING,
VALUE19 TYPE STRING,
VALUE20 TYPE STRING,
VALUE21 TYPE STRING,
VALUE22 TYPE STRING,
VALUE23 TYPE STRING,
VALUE24 TYPE STRING,
VALUE25 TYPE STRING,
VALUE26 TYPE STRING,
VALUE27 TYPE STRING,
VALUE28 TYPE STRING,
VALUE29 TYPE STRING,
VALUE30 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_LTR2_KB_S_DISP_CONDITION_PREV_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_LTR2_KB_S_DISP_CONDITION_PREV_STR-VALUE1 sy-vline 
WA_LTR2_KB_S_DISP_CONDITION_PREV_STR-VALUE2 sy-vline 
WA_LTR2_KB_S_DISP_CONDITION_PREV_STR-VALUE3 sy-vline 
WA_LTR2_KB_S_DISP_CONDITION_PREV_STR-VALUE4 sy-vline 
WA_LTR2_KB_S_DISP_CONDITION_PREV_STR-VALUE5 sy-vline 
WA_LTR2_KB_S_DISP_CONDITION_PREV_STR-VALUE6 sy-vline 
WA_LTR2_KB_S_DISP_CONDITION_PREV_STR-VALUE7 sy-vline 
WA_LTR2_KB_S_DISP_CONDITION_PREV_STR-VALUE8 sy-vline 
WA_LTR2_KB_S_DISP_CONDITION_PREV_STR-VALUE9 sy-vline 
WA_LTR2_KB_S_DISP_CONDITION_PREV_STR-VALUE10 sy-vline 
WA_LTR2_KB_S_DISP_CONDITION_PREV_STR-VALUE11 sy-vline 
WA_LTR2_KB_S_DISP_CONDITION_PREV_STR-VALUE12 sy-vline 
WA_LTR2_KB_S_DISP_CONDITION_PREV_STR-VALUE13 sy-vline 
WA_LTR2_KB_S_DISP_CONDITION_PREV_STR-VALUE14 sy-vline 
WA_LTR2_KB_S_DISP_CONDITION_PREV_STR-VALUE15 sy-vline 
WA_LTR2_KB_S_DISP_CONDITION_PREV_STR-VALUE16 sy-vline 
WA_LTR2_KB_S_DISP_CONDITION_PREV_STR-VALUE17 sy-vline 
WA_LTR2_KB_S_DISP_CONDITION_PREV_STR-VALUE18 sy-vline 
WA_LTR2_KB_S_DISP_CONDITION_PREV_STR-VALUE19 sy-vline 
WA_LTR2_KB_S_DISP_CONDITION_PREV_STR-VALUE20 sy-vline 
WA_LTR2_KB_S_DISP_CONDITION_PREV_STR-VALUE21 sy-vline 
WA_LTR2_KB_S_DISP_CONDITION_PREV_STR-VALUE22 sy-vline 
WA_LTR2_KB_S_DISP_CONDITION_PREV_STR-VALUE23 sy-vline 
WA_LTR2_KB_S_DISP_CONDITION_PREV_STR-VALUE24 sy-vline 
WA_LTR2_KB_S_DISP_CONDITION_PREV_STR-VALUE25 sy-vline 
WA_LTR2_KB_S_DISP_CONDITION_PREV_STR-VALUE26 sy-vline 
WA_LTR2_KB_S_DISP_CONDITION_PREV_STR-VALUE27 sy-vline 
WA_LTR2_KB_S_DISP_CONDITION_PREV_STR-VALUE28 sy-vline 
WA_LTR2_KB_S_DISP_CONDITION_PREV_STR-VALUE29 sy-vline 
WA_LTR2_KB_S_DISP_CONDITION_PREV_STR-VALUE30 sy-vline      INTO ld_text SEPARATED BY SPACE.

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