ABAP Select data from SAP table BDLS_SELECTION_PAIRS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM BDLS_SELECTION_PAIRS
*  INTO TABLE @DATA(IT_BDLS_SELECTION_PAIRS2).
*--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_BDLS_SELECTION_PAIRS INDEX 1 INTO DATA(WA_BDLS_SELECTION_PAIRS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<BDLS_SELECTION_PAIRS>-LOGSYS_TAB = 1.
<BDLS_SELECTION_PAIRS>-CLNTDEP = 1.
<BDLS_SELECTION_PAIRS>-TEST = 1.
<BDLS_SELECTION_PAIRS>-CHECK = 1.
<BDLS_SELECTION_PAIRS>-MAXIMUM = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_BDLS_SELECTION_PAIRS-TABLIST, sy-vline,
  WA_BDLS_SELECTION_PAIRS-PROGRAM, sy-vline,
  WA_BDLS_SELECTION_PAIRS-INITIATOR, sy-vline,
  WA_BDLS_SELECTION_PAIRS-BATCH, sy-vline,
  WA_BDLS_SELECTION_PAIRS-TABNEW, sy-vline,
  WA_BDLS_SELECTION_PAIRS-SPECIAL, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_BDLS_SELECTION_PAIRS 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_BDLS_SELECTION_PAIRS 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_BDLS_SELECTION_PAIRS INTO WA_BDLS_SELECTION_PAIRS.


*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 INITIATOR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_BDLS_SELECTION_PAIRS-INITIATOR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_BDLS_SELECTION_PAIRS-INITIATOR.
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_BDLS_SELECTION_PAIRS_STR, 
LOGSYS_TAB TYPE STRING,
CLNTDEP TYPE STRING,
TEST TYPE STRING,
CHECK TYPE STRING,
MAXIMUM TYPE STRING,
TABLIST TYPE STRING,
PROGRAM TYPE STRING,
INITIATOR TYPE STRING,
BATCH TYPE STRING,
TABNEW TYPE STRING,
SPECIAL TYPE STRING,END OF T_EKKO_STR.
DATA: WA_BDLS_SELECTION_PAIRS_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_BDLS_SELECTION_PAIRS_STR-LOGSYS_TAB sy-vline 
WA_BDLS_SELECTION_PAIRS_STR-CLNTDEP sy-vline 
WA_BDLS_SELECTION_PAIRS_STR-TEST sy-vline 
WA_BDLS_SELECTION_PAIRS_STR-CHECK sy-vline 
WA_BDLS_SELECTION_PAIRS_STR-MAXIMUM sy-vline 
WA_BDLS_SELECTION_PAIRS_STR-TABLIST sy-vline 
WA_BDLS_SELECTION_PAIRS_STR-PROGRAM sy-vline 
WA_BDLS_SELECTION_PAIRS_STR-INITIATOR sy-vline 
WA_BDLS_SELECTION_PAIRS_STR-BATCH sy-vline 
WA_BDLS_SELECTION_PAIRS_STR-TABNEW sy-vline 
WA_BDLS_SELECTION_PAIRS_STR-SPECIAL sy-vline      INTO ld_text SEPARATED BY SPACE.

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