ABAP Select data from SAP table CNV_LTHCM_S_SEL_UI_FIELDS into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP CNV_LTHCM_S_SEL_UI_FIELDS 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_LTHCM_S_SEL_UI_FIELDS. 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_LTHCM_S_SEL_UI_FIELDS 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_LTHCM_S_SEL_UI_FIELDS TYPE STANDARD TABLE OF CNV_LTHCM_S_SEL_UI_FIELDS,
      WA_CNV_LTHCM_S_SEL_UI_FIELDS TYPE CNV_LTHCM_S_SEL_UI_FIELDS,
      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_LTHCM_S_SEL_UI_FIELDS> TYPE CNV_LTHCM_S_SEL_UI_FIELDS.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CNV_LTHCM_S_SEL_UI_FIELDS
*  INTO TABLE @DATA(IT_CNV_LTHCM_S_SEL_UI_FIELDS2).
*--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_LTHCM_S_SEL_UI_FIELDS INDEX 1 INTO DATA(WA_CNV_LTHCM_S_SEL_UI_FIELDS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CNV_LTHCM_S_SEL_UI_FIELDS>-PACKID = 1.
<CNV_LTHCM_S_SEL_UI_FIELDS>-PRESEL_ID = 1.
<CNV_LTHCM_S_SEL_UI_FIELDS>-PRESEL_HRID = 1.
<CNV_LTHCM_S_SEL_UI_FIELDS>-PRESEL_HRID_NEW = 1.
<CNV_LTHCM_S_SEL_UI_FIELDS>-PRESEL_TYPE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CNV_LTHCM_S_SEL_UI_FIELDS-PRESEL_ACTIVE, sy-vline,
  WA_CNV_LTHCM_S_SEL_UI_FIELDS-PRESEL_INACTIVE, sy-vline,
  WA_CNV_LTHCM_S_SEL_UI_FIELDS-PRESEL_TXT, sy-vline,
  WA_CNV_LTHCM_S_SEL_UI_FIELDS-PRESEL_TXT_NEW, sy-vline,
  WA_CNV_LTHCM_S_SEL_UI_FIELDS-PRESEL_TYPE_1_IND, sy-vline,
  WA_CNV_LTHCM_S_SEL_UI_FIELDS-PRESEL_TYPE_5_IND, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CNV_LTHCM_S_SEL_UI_FIELDS 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_LTHCM_S_SEL_UI_FIELDS 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_LTHCM_S_SEL_UI_FIELDS INTO WA_CNV_LTHCM_S_SEL_UI_FIELDS.


*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_CNV_LTHCM_S_SEL_UI_FIELDS_STR, 
PACKID TYPE STRING,
PRESEL_ID TYPE STRING,
PRESEL_HRID TYPE STRING,
PRESEL_HRID_NEW TYPE STRING,
PRESEL_TYPE TYPE STRING,
PRESEL_ACTIVE TYPE STRING,
PRESEL_INACTIVE TYPE STRING,
PRESEL_TXT TYPE STRING,
PRESEL_TXT_NEW TYPE STRING,
PRESEL_TYPE_1_IND TYPE STRING,
PRESEL_TYPE_5_IND TYPE STRING,
PRESEL_TYPE_0_IND TYPE STRING,
CREATED TYPE STRING,
CRDATE TYPE STRING,
CRTIME TYPE STRING,
CRUSER TYPE STRING,
CHANGED TYPE STRING,
CHDATE TYPE STRING,
CHTIME TYPE STRING,
CHUSER TYPE STRING,
SOURCE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CNV_LTHCM_S_SEL_UI_FIELDS_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_LTHCM_S_SEL_UI_FIELDS_STR-PACKID sy-vline 
WA_CNV_LTHCM_S_SEL_UI_FIELDS_STR-PRESEL_ID sy-vline 
WA_CNV_LTHCM_S_SEL_UI_FIELDS_STR-PRESEL_HRID sy-vline 
WA_CNV_LTHCM_S_SEL_UI_FIELDS_STR-PRESEL_HRID_NEW sy-vline 
WA_CNV_LTHCM_S_SEL_UI_FIELDS_STR-PRESEL_TYPE sy-vline 
WA_CNV_LTHCM_S_SEL_UI_FIELDS_STR-PRESEL_ACTIVE sy-vline 
WA_CNV_LTHCM_S_SEL_UI_FIELDS_STR-PRESEL_INACTIVE sy-vline 
WA_CNV_LTHCM_S_SEL_UI_FIELDS_STR-PRESEL_TXT sy-vline 
WA_CNV_LTHCM_S_SEL_UI_FIELDS_STR-PRESEL_TXT_NEW sy-vline 
WA_CNV_LTHCM_S_SEL_UI_FIELDS_STR-PRESEL_TYPE_1_IND sy-vline 
WA_CNV_LTHCM_S_SEL_UI_FIELDS_STR-PRESEL_TYPE_5_IND sy-vline 
WA_CNV_LTHCM_S_SEL_UI_FIELDS_STR-PRESEL_TYPE_0_IND sy-vline 
WA_CNV_LTHCM_S_SEL_UI_FIELDS_STR-CREATED sy-vline 
WA_CNV_LTHCM_S_SEL_UI_FIELDS_STR-CRDATE sy-vline 
WA_CNV_LTHCM_S_SEL_UI_FIELDS_STR-CRTIME sy-vline 
WA_CNV_LTHCM_S_SEL_UI_FIELDS_STR-CRUSER sy-vline 
WA_CNV_LTHCM_S_SEL_UI_FIELDS_STR-CHANGED sy-vline 
WA_CNV_LTHCM_S_SEL_UI_FIELDS_STR-CHDATE sy-vline 
WA_CNV_LTHCM_S_SEL_UI_FIELDS_STR-CHTIME sy-vline 
WA_CNV_LTHCM_S_SEL_UI_FIELDS_STR-CHUSER sy-vline 
WA_CNV_LTHCM_S_SEL_UI_FIELDS_STR-SOURCE sy-vline      INTO ld_text SEPARATED BY SPACE.

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