ABAP Select data from SAP table LTR2_UI_S_ANA2_FLD_DIFF into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP LTR2_UI_S_ANA2_FLD_DIFF 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_UI_S_ANA2_FLD_DIFF. 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_UI_S_ANA2_FLD_DIFF 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_UI_S_ANA2_FLD_DIFF TYPE STANDARD TABLE OF LTR2_UI_S_ANA2_FLD_DIFF,
      WA_LTR2_UI_S_ANA2_FLD_DIFF TYPE LTR2_UI_S_ANA2_FLD_DIFF,
      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_UI_S_ANA2_FLD_DIFF> TYPE LTR2_UI_S_ANA2_FLD_DIFF.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_LTR2_UI_S_ANA2_FLD_DIFF.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM LTR2_UI_S_ANA2_FLD_DIFF
  INTO TABLE IT_LTR2_UI_S_ANA2_FLD_DIFF.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM LTR2_UI_S_ANA2_FLD_DIFF
*  INTO TABLE @DATA(IT_LTR2_UI_S_ANA2_FLD_DIFF2).
*--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_UI_S_ANA2_FLD_DIFF INDEX 1 INTO DATA(WA_LTR2_UI_S_ANA2_FLD_DIFF2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_LTR2_UI_S_ANA2_FLD_DIFF ASSIGNING <LTR2_UI_S_ANA2_FLD_DIFF>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<LTR2_UI_S_ANA2_FLD_DIFF>-FIELDNAME = 1.
<LTR2_UI_S_ANA2_FLD_DIFF>-POSITION_NO = 1.
<LTR2_UI_S_ANA2_FLD_DIFF>-KEYFLAG = 1.
<LTR2_UI_S_ANA2_FLD_DIFF>-ROLLNAME = 1.
<LTR2_UI_S_ANA2_FLD_DIFF>-DOMNAME = 1.

ENDLOOP.

LOOP AT IT_LTR2_UI_S_ANA2_FLD_DIFF INTO WA_LTR2_UI_S_ANA2_FLD_DIFF.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_LTR2_UI_S_ANA2_FLD_DIFF-INTTYPE, sy-vline,
  WA_LTR2_UI_S_ANA2_FLD_DIFF-LENG, sy-vline,
  WA_LTR2_UI_S_ANA2_FLD_DIFF-DECIMALS, sy-vline,
  WA_LTR2_UI_S_ANA2_FLD_DIFF-DATATYPE, sy-vline,
  WA_LTR2_UI_S_ANA2_FLD_DIFF-INTLEN, sy-vline,
  WA_LTR2_UI_S_ANA2_FLD_DIFF-OUTPUTLEN, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_LTR2_UI_S_ANA2_FLD_DIFF 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_UI_S_ANA2_FLD_DIFF 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_UI_S_ANA2_FLD_DIFF INTO WA_LTR2_UI_S_ANA2_FLD_DIFF.


*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 DATATYPE
CALL FUNCTION 'CONVERSION_EXIT_DTYPE_OUTPUT'
  EXPORTING
    input =                      WA_LTR2_UI_S_ANA2_FLD_DIFF-DATATYPE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LTR2_UI_S_ANA2_FLD_DIFF-DATATYPE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit DTYPE, internal->external for field DATATYPE_R
CALL FUNCTION 'CONVERSION_EXIT_DTYPE_OUTPUT'
  EXPORTING
    input =                      WA_LTR2_UI_S_ANA2_FLD_DIFF-DATATYPE_R
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LTR2_UI_S_ANA2_FLD_DIFF-DATATYPE_R.
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_LTR2_UI_S_ANA2_FLD_DIFF_STR, 
FIELDNAME TYPE STRING,
POSITION_NO TYPE STRING,
KEYFLAG TYPE STRING,
ROLLNAME TYPE STRING,
DOMNAME TYPE STRING,
INTTYPE TYPE STRING,
LENG TYPE STRING,
DECIMALS TYPE STRING,
DATATYPE TYPE STRING,
INTLEN TYPE STRING,
OUTPUTLEN TYPE STRING,
LOWERCASE TYPE STRING,
CONVEXIT TYPE STRING,
REFFIELD TYPE STRING,
REFTABLE TYPE STRING,
DDTEXT TYPE STRING,
IS_SQLTAB_KEY TYPE STRING,
FIELDNAME_R TYPE STRING,
POSITION_NO_R TYPE STRING,
KEYFLAG_R TYPE STRING,
ROLLNAME_R TYPE STRING,
DOMNAME_R TYPE STRING,
INTTYPE_R TYPE STRING,
LENG_R TYPE STRING,
DECIMALS_R TYPE STRING,
DATATYPE_R TYPE STRING,
INTLEN_R TYPE STRING,
OUTPUTLEN_R TYPE STRING,
LOWERCASE_R TYPE STRING,
CONVEXIT_R TYPE STRING,
REFFIELD_R TYPE STRING,
REFTABLE_R TYPE STRING,
DDTEXT_R TYPE STRING,
IS_SQLTAB_KEY_R TYPE STRING,
FLD_DIFF TYPE STRING,
FLD_DIFF_UI TYPE STRING,
ALV_COLOR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_LTR2_UI_S_ANA2_FLD_DIFF_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_UI_S_ANA2_FLD_DIFF_STR-FIELDNAME sy-vline 
WA_LTR2_UI_S_ANA2_FLD_DIFF_STR-POSITION_NO sy-vline 
WA_LTR2_UI_S_ANA2_FLD_DIFF_STR-KEYFLAG sy-vline 
WA_LTR2_UI_S_ANA2_FLD_DIFF_STR-ROLLNAME sy-vline 
WA_LTR2_UI_S_ANA2_FLD_DIFF_STR-DOMNAME sy-vline 
WA_LTR2_UI_S_ANA2_FLD_DIFF_STR-INTTYPE sy-vline 
WA_LTR2_UI_S_ANA2_FLD_DIFF_STR-LENG sy-vline 
WA_LTR2_UI_S_ANA2_FLD_DIFF_STR-DECIMALS sy-vline 
WA_LTR2_UI_S_ANA2_FLD_DIFF_STR-DATATYPE sy-vline 
WA_LTR2_UI_S_ANA2_FLD_DIFF_STR-INTLEN sy-vline 
WA_LTR2_UI_S_ANA2_FLD_DIFF_STR-OUTPUTLEN sy-vline 
WA_LTR2_UI_S_ANA2_FLD_DIFF_STR-LOWERCASE sy-vline 
WA_LTR2_UI_S_ANA2_FLD_DIFF_STR-CONVEXIT sy-vline 
WA_LTR2_UI_S_ANA2_FLD_DIFF_STR-REFFIELD sy-vline 
WA_LTR2_UI_S_ANA2_FLD_DIFF_STR-REFTABLE sy-vline 
WA_LTR2_UI_S_ANA2_FLD_DIFF_STR-DDTEXT sy-vline 
WA_LTR2_UI_S_ANA2_FLD_DIFF_STR-IS_SQLTAB_KEY sy-vline 
WA_LTR2_UI_S_ANA2_FLD_DIFF_STR-FIELDNAME_R sy-vline 
WA_LTR2_UI_S_ANA2_FLD_DIFF_STR-POSITION_NO_R sy-vline 
WA_LTR2_UI_S_ANA2_FLD_DIFF_STR-KEYFLAG_R sy-vline 
WA_LTR2_UI_S_ANA2_FLD_DIFF_STR-ROLLNAME_R sy-vline 
WA_LTR2_UI_S_ANA2_FLD_DIFF_STR-DOMNAME_R sy-vline 
WA_LTR2_UI_S_ANA2_FLD_DIFF_STR-INTTYPE_R sy-vline 
WA_LTR2_UI_S_ANA2_FLD_DIFF_STR-LENG_R sy-vline 
WA_LTR2_UI_S_ANA2_FLD_DIFF_STR-DECIMALS_R sy-vline 
WA_LTR2_UI_S_ANA2_FLD_DIFF_STR-DATATYPE_R sy-vline 
WA_LTR2_UI_S_ANA2_FLD_DIFF_STR-INTLEN_R sy-vline 
WA_LTR2_UI_S_ANA2_FLD_DIFF_STR-OUTPUTLEN_R sy-vline 
WA_LTR2_UI_S_ANA2_FLD_DIFF_STR-LOWERCASE_R sy-vline 
WA_LTR2_UI_S_ANA2_FLD_DIFF_STR-CONVEXIT_R sy-vline 
WA_LTR2_UI_S_ANA2_FLD_DIFF_STR-REFFIELD_R sy-vline 
WA_LTR2_UI_S_ANA2_FLD_DIFF_STR-REFTABLE_R sy-vline 
WA_LTR2_UI_S_ANA2_FLD_DIFF_STR-DDTEXT_R sy-vline 
WA_LTR2_UI_S_ANA2_FLD_DIFF_STR-IS_SQLTAB_KEY_R sy-vline 
WA_LTR2_UI_S_ANA2_FLD_DIFF_STR-FLD_DIFF sy-vline 
WA_LTR2_UI_S_ANA2_FLD_DIFF_STR-FLD_DIFF_UI sy-vline 
WA_LTR2_UI_S_ANA2_FLD_DIFF_STR-ALV_COLOR sy-vline      INTO ld_text SEPARATED BY SPACE.

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