ABAP Select data from SAP table /DSD/SV_LC_HD_SCREEN into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP /DSD/SV_LC_HD_SCREEN 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 /DSD/SV_LC_HD_SCREEN. 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 /DSD/SV_LC_HD_SCREEN 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_/DSD/SV_LC_HD_SCREEN TYPE STANDARD TABLE OF /DSD/SV_LC_HD_SCREEN,
      WA_/DSD/SV_LC_HD_SCREEN TYPE /DSD/SV_LC_HD_SCREEN,
      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: </DSD/SV_LC_HD_SCREEN> TYPE /DSD/SV_LC_HD_SCREEN.

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

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM /DSD/SV_LC_HD_SCREEN
  INTO TABLE IT_/DSD/SV_LC_HD_SCREEN.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /DSD/SV_LC_HD_SCREEN
*  INTO TABLE @DATA(IT_/DSD/SV_LC_HD_SCREEN2).
*--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_/DSD/SV_LC_HD_SCREEN INDEX 1 INTO DATA(WA_/DSD/SV_LC_HD_SCREEN2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_/DSD/SV_LC_HD_SCREEN ASSIGNING </DSD/SV_LC_HD_SCREEN>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
</DSD/SV_LC_HD_SCREEN>-CLIENT = 1.
</DSD/SV_LC_HD_SCREEN>-OBJ_TYP = 1.
</DSD/SV_LC_HD_SCREEN>-OBJ_ID = 1.
</DSD/SV_LC_HD_SCREEN>-LC_SEQUENCE = 1.
</DSD/SV_LC_HD_SCREEN>-LC_STATUS = 1.

ENDLOOP.

LOOP AT IT_/DSD/SV_LC_HD_SCREEN INTO WA_/DSD/SV_LC_HD_SCREEN.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/DSD/SV_LC_HD_SCREEN-TPLST, sy-vline,
  WA_/DSD/SV_LC_HD_SCREEN-ROUTE, sy-vline,
  WA_/DSD/SV_LC_HD_SCREEN-DRIVER, sy-vline,
  WA_/DSD/SV_LC_HD_SCREEN-VEHICLE, sy-vline,
  WA_/DSD/SV_LC_HD_SCREEN-CREUSER, sy-vline,
  WA_/DSD/SV_LC_HD_SCREEN-CREDATE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/DSD/SV_LC_HD_SCREEN 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_/DSD/SV_LC_HD_SCREEN 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_/DSD/SV_LC_HD_SCREEN INTO WA_/DSD/SV_LC_HD_SCREEN.


*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 ALPHA, internal->external for field OBJ_ID
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/DSD/SV_LC_HD_SCREEN-OBJ_ID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/DSD/SV_LC_HD_SCREEN-OBJ_ID.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field DRIVER
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/DSD/SV_LC_HD_SCREEN-DRIVER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/DSD/SV_LC_HD_SCREEN-DRIVER.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field VEHICLE
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/DSD/SV_LC_HD_SCREEN-VEHICLE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/DSD/SV_LC_HD_SCREEN-VEHICLE.
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_/DSD/SV_LC_HD_SCREEN_STR, 
CLIENT TYPE STRING,
OBJ_TYP TYPE STRING,
OBJ_ID TYPE STRING,
LC_SEQUENCE TYPE STRING,
LC_STATUS TYPE STRING,
TPLST TYPE STRING,
ROUTE TYPE STRING,
DRIVER TYPE STRING,
VEHICLE TYPE STRING,
CREUSER TYPE STRING,
CREDATE TYPE STRING,
CRETIME TYPE STRING,
CNGUSER TYPE STRING,
CNGDATE TYPE STRING,
CNGTIME TYPE STRING,
NAME1 TYPE STRING,
EQKTX TYPE STRING,
TPLST_TXT TYPE STRING,
BEZEI TYPE STRING,
LC_STATUS_TXT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/DSD/SV_LC_HD_SCREEN_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_/DSD/SV_LC_HD_SCREEN_STR-CLIENT sy-vline 
WA_/DSD/SV_LC_HD_SCREEN_STR-OBJ_TYP sy-vline 
WA_/DSD/SV_LC_HD_SCREEN_STR-OBJ_ID sy-vline 
WA_/DSD/SV_LC_HD_SCREEN_STR-LC_SEQUENCE sy-vline 
WA_/DSD/SV_LC_HD_SCREEN_STR-LC_STATUS sy-vline 
WA_/DSD/SV_LC_HD_SCREEN_STR-TPLST sy-vline 
WA_/DSD/SV_LC_HD_SCREEN_STR-ROUTE sy-vline 
WA_/DSD/SV_LC_HD_SCREEN_STR-DRIVER sy-vline 
WA_/DSD/SV_LC_HD_SCREEN_STR-VEHICLE sy-vline 
WA_/DSD/SV_LC_HD_SCREEN_STR-CREUSER sy-vline 
WA_/DSD/SV_LC_HD_SCREEN_STR-CREDATE sy-vline 
WA_/DSD/SV_LC_HD_SCREEN_STR-CRETIME sy-vline 
WA_/DSD/SV_LC_HD_SCREEN_STR-CNGUSER sy-vline 
WA_/DSD/SV_LC_HD_SCREEN_STR-CNGDATE sy-vline 
WA_/DSD/SV_LC_HD_SCREEN_STR-CNGTIME sy-vline 
WA_/DSD/SV_LC_HD_SCREEN_STR-NAME1 sy-vline 
WA_/DSD/SV_LC_HD_SCREEN_STR-EQKTX sy-vline 
WA_/DSD/SV_LC_HD_SCREEN_STR-TPLST_TXT sy-vline 
WA_/DSD/SV_LC_HD_SCREEN_STR-BEZEI sy-vline 
WA_/DSD/SV_LC_HD_SCREEN_STR-LC_STATUS_TXT sy-vline      INTO ld_text SEPARATED BY SPACE.

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