ABAP Select data from SAP table BUS_SCREEN into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP BUS_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 BUS_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 BUS_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_BUS_SCREEN TYPE STANDARD TABLE OF BUS_SCREEN,
      WA_BUS_SCREEN TYPE BUS_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: <BUS_SCREEN> TYPE BUS_SCREEN.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM BUS_SCREEN
*  INTO TABLE @DATA(IT_BUS_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_BUS_SCREEN INDEX 1 INTO DATA(WA_BUS_SCREEN2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<BUS_SCREEN>-BOOLEAN = 1.
<BUS_SCREEN>-PROGRAM_NAME = 1.
<BUS_SCREEN>-DYNPRO_NUMBER = 1.
<BUS_SCREEN>-AREA = 1.
<BUS_SCREEN>-PROGRAM_NAME = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_BUS_SCREEN-DYNPRO_NUMBER, sy-vline,
  WA_BUS_SCREEN-FIELD_NAME, sy-vline,
  WA_BUS_SCREEN-FIELD_NAME_TABLE, sy-vline,
  WA_BUS_SCREEN-FUNCTION_CODE, sy-vline,
  WA_BUS_SCREEN-DROPDOWN_VALUE, sy-vline,
  WA_BUS_SCREEN-TEXT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_BUS_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_BUS_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_BUS_SCREEN INTO WA_BUS_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.
ENDFORM. 

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

TYPES: BEGIN OF T_BUS_SCREEN_STR, 
BOOLEAN TYPE STRING,
PROGRAM_NAME TYPE STRING,
DYNPRO_NUMBER TYPE STRING,
AREA TYPE STRING,
PROGRAM_NAME TYPE STRING,
DYNPRO_NUMBER TYPE STRING,
FIELD_NAME TYPE STRING,
FIELD_NAME_TABLE TYPE STRING,
FUNCTION_CODE TYPE STRING,
DROPDOWN_VALUE TYPE STRING,
TEXT TYPE STRING,
KEY TYPE STRING,
DROPDOWN_VALUES TYPE STRING,
STATUS_KEY TYPE STRING,
TITLE TYPE STRING,
FIELD_GROUP TYPE STRING,
FIELD_STATUS TYPE STRING,
TABSTRIP TYPE STRING,
TAB_01 TYPE STRING,
TAB_02 TYPE STRING,
TAB_03 TYPE STRING,
TAB_04 TYPE STRING,
TAB_05 TYPE STRING,
TAB_06 TYPE STRING,
TAB_07 TYPE STRING,
TAB_08 TYPE STRING,
TAB_09 TYPE STRING,
TAB_10 TYPE STRING,
TAB_11 TYPE STRING,
TAB_12 TYPE STRING,
TAB_13 TYPE STRING,
TAB_14 TYPE STRING,
TAB_15 TYPE STRING,
TAB_16 TYPE STRING,
TAB_17 TYPE STRING,
TAB_18 TYPE STRING,
TAB_19 TYPE STRING,
TAB_20 TYPE STRING,
AREA TYPE STRING,
PROGRAM_NAME TYPE STRING,
DYNPRO_NUMBER TYPE STRING,END OF T_EKKO_STR.
DATA: WA_BUS_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_BUS_SCREEN_STR-BOOLEAN sy-vline 
WA_BUS_SCREEN_STR-PROGRAM_NAME sy-vline 
WA_BUS_SCREEN_STR-DYNPRO_NUMBER sy-vline 
WA_BUS_SCREEN_STR-AREA sy-vline 
WA_BUS_SCREEN_STR-PROGRAM_NAME sy-vline 
WA_BUS_SCREEN_STR-DYNPRO_NUMBER sy-vline 
WA_BUS_SCREEN_STR-FIELD_NAME sy-vline 
WA_BUS_SCREEN_STR-FIELD_NAME_TABLE sy-vline 
WA_BUS_SCREEN_STR-FUNCTION_CODE sy-vline 
WA_BUS_SCREEN_STR-DROPDOWN_VALUE sy-vline 
WA_BUS_SCREEN_STR-TEXT sy-vline 
WA_BUS_SCREEN_STR-KEY sy-vline 
WA_BUS_SCREEN_STR-DROPDOWN_VALUES sy-vline 
WA_BUS_SCREEN_STR-STATUS_KEY sy-vline 
WA_BUS_SCREEN_STR-TITLE sy-vline 
WA_BUS_SCREEN_STR-FIELD_GROUP sy-vline 
WA_BUS_SCREEN_STR-FIELD_STATUS sy-vline 
WA_BUS_SCREEN_STR-TABSTRIP sy-vline 
WA_BUS_SCREEN_STR-TAB_01 sy-vline 
WA_BUS_SCREEN_STR-TAB_02 sy-vline 
WA_BUS_SCREEN_STR-TAB_03 sy-vline 
WA_BUS_SCREEN_STR-TAB_04 sy-vline 
WA_BUS_SCREEN_STR-TAB_05 sy-vline 
WA_BUS_SCREEN_STR-TAB_06 sy-vline 
WA_BUS_SCREEN_STR-TAB_07 sy-vline 
WA_BUS_SCREEN_STR-TAB_08 sy-vline 
WA_BUS_SCREEN_STR-TAB_09 sy-vline 
WA_BUS_SCREEN_STR-TAB_10 sy-vline 
WA_BUS_SCREEN_STR-TAB_11 sy-vline 
WA_BUS_SCREEN_STR-TAB_12 sy-vline 
WA_BUS_SCREEN_STR-TAB_13 sy-vline 
WA_BUS_SCREEN_STR-TAB_14 sy-vline 
WA_BUS_SCREEN_STR-TAB_15 sy-vline 
WA_BUS_SCREEN_STR-TAB_16 sy-vline 
WA_BUS_SCREEN_STR-TAB_17 sy-vline 
WA_BUS_SCREEN_STR-TAB_18 sy-vline 
WA_BUS_SCREEN_STR-TAB_19 sy-vline 
WA_BUS_SCREEN_STR-TAB_20 sy-vline 
WA_BUS_SCREEN_STR-AREA sy-vline 
WA_BUS_SCREEN_STR-PROGRAM_NAME sy-vline 
WA_BUS_SCREEN_STR-DYNPRO_NUMBER sy-vline      INTO ld_text SEPARATED BY SPACE.

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