ABAP Select data from SAP table DISCONT_POS_ALV_STY into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DISCONT_POS_ALV_STY
*  INTO TABLE @DATA(IT_DISCONT_POS_ALV_STY2).
*--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_DISCONT_POS_ALV_STY INDEX 1 INTO DATA(WA_DISCONT_POS_ALV_STY2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DISCONT_POS_ALV_STY>-SELKZ = 1.
<DISCONT_POS_ALV_STY>-LIGHTS = 1.
<DISCONT_POS_ALV_STY>-POSNR = 1.
<DISCONT_POS_ALV_STY>-MANDT = 1.
<DISCONT_POS_ALV_STY>-MATNR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DISCONT_POS_ALV_STY-LIFNR, sy-vline,
  WA_DISCONT_POS_ALV_STY-WERKS, sy-vline,
  WA_DISCONT_POS_ALV_STY-LOCNR, sy-vline,
  WA_DISCONT_POS_ALV_STY-MATKL, sy-vline,
  WA_DISCONT_POS_ALV_STY-EKORG, sy-vline,
  WA_DISCONT_POS_ALV_STY-VKORG, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DISCONT_POS_ALV_STY 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_DISCONT_POS_ALV_STY 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_DISCONT_POS_ALV_STY INTO WA_DISCONT_POS_ALV_STY.


*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 MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_DISCONT_POS_ALV_STY-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DISCONT_POS_ALV_STY-MATNR.
WRITE:/ 'New Value:', ld_input.

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

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

*Conversion exit ALPHA, internal->external for field INFNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_DISCONT_POS_ALV_STY-INFNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DISCONT_POS_ALV_STY-INFNR.
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_DISCONT_POS_ALV_STY_STR, 
SELKZ TYPE STRING,
LIGHTS TYPE STRING,
POSNR TYPE STRING,
MANDT TYPE STRING,
MATNR TYPE STRING,
LIFNR TYPE STRING,
WERKS TYPE STRING,
LOCNR TYPE STRING,
MATKL TYPE STRING,
EKORG TYPE STRING,
VKORG TYPE STRING,
VTWEG TYPE STRING,
INFNR TYPE STRING,
ALDAT TYPE STRING,
BSPER TYPE STRING,
VSPER TYPE STRING,
LGORT TYPE STRING,
LGNUM TYPE STRING,
BWTAR TYPE STRING,
MAKTX TYPE STRING,
SPERRE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DISCONT_POS_ALV_STY_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_DISCONT_POS_ALV_STY_STR-SELKZ sy-vline 
WA_DISCONT_POS_ALV_STY_STR-LIGHTS sy-vline 
WA_DISCONT_POS_ALV_STY_STR-POSNR sy-vline 
WA_DISCONT_POS_ALV_STY_STR-MANDT sy-vline 
WA_DISCONT_POS_ALV_STY_STR-MATNR sy-vline 
WA_DISCONT_POS_ALV_STY_STR-LIFNR sy-vline 
WA_DISCONT_POS_ALV_STY_STR-WERKS sy-vline 
WA_DISCONT_POS_ALV_STY_STR-LOCNR sy-vline 
WA_DISCONT_POS_ALV_STY_STR-MATKL sy-vline 
WA_DISCONT_POS_ALV_STY_STR-EKORG sy-vline 
WA_DISCONT_POS_ALV_STY_STR-VKORG sy-vline 
WA_DISCONT_POS_ALV_STY_STR-VTWEG sy-vline 
WA_DISCONT_POS_ALV_STY_STR-INFNR sy-vline 
WA_DISCONT_POS_ALV_STY_STR-ALDAT sy-vline 
WA_DISCONT_POS_ALV_STY_STR-BSPER sy-vline 
WA_DISCONT_POS_ALV_STY_STR-VSPER sy-vline 
WA_DISCONT_POS_ALV_STY_STR-LGORT sy-vline 
WA_DISCONT_POS_ALV_STY_STR-LGNUM sy-vline 
WA_DISCONT_POS_ALV_STY_STR-BWTAR sy-vline 
WA_DISCONT_POS_ALV_STY_STR-MAKTX sy-vline 
WA_DISCONT_POS_ALV_STY_STR-SPERRE sy-vline      INTO ld_text SEPARATED BY SPACE.

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