ABAP Select data from SAP table BIW_ISU_DISCON into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM BIW_ISU_DISCON
*  INTO TABLE @DATA(IT_BIW_ISU_DISCON2).
*--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_BIW_ISU_DISCON INDEX 1 INTO DATA(WA_BIW_ISU_DISCON2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<BIW_ISU_DISCON>-DISCNO = 1.
<BIW_ISU_DISCON>-DISCACT_BEGIN = 1.
<BIW_ISU_DISCON>-DISCOBJ = 1.
<BIW_ISU_DISCON>-AB = 1.
<BIW_ISU_DISCON>-AB_TIME = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_BIW_ISU_DISCON-BIS, sy-vline,
  WA_BIW_ISU_DISCON-BIS_TIME, sy-vline,
  WA_BIW_ISU_DISCON-ANLAGE, sy-vline,
  WA_BIW_ISU_DISCON-EQUINR, sy-vline,
  WA_BIW_ISU_DISCON-DISCOBJTYP, sy-vline,
  WA_BIW_ISU_DISCON-DISCREASON, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_BIW_ISU_DISCON 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_BIW_ISU_DISCON 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_BIW_ISU_DISCON INTO WA_BIW_ISU_DISCON.


*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 DISCNO
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_BIW_ISU_DISCON-DISCNO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_BIW_ISU_DISCON-DISCNO.
WRITE:/ 'New Value:', ld_input.

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

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

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

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

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

*Conversion exit TPLNR, internal->external for field CONNOBJ
CALL FUNCTION 'CONVERSION_EXIT_TPLNR_OUTPUT'
  EXPORTING
    input =                      WA_BIW_ISU_DISCON-CONNOBJ
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_BIW_ISU_DISCON-CONNOBJ.
WRITE:/ 'New Value:', ld_input.

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

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

*Conversion exit GERNR, internal->external for field DEVICE
CALL FUNCTION 'CONVERSION_EXIT_GERNR_OUTPUT'
  EXPORTING
    input =                      WA_BIW_ISU_DISCON-DEVICE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_BIW_ISU_DISCON-DEVICE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field DISCTYPE
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_BIW_ISU_DISCON-DISCTYPE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_BIW_ISU_DISCON-DISCTYPE.
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_BIW_ISU_DISCON_STR, 
DISCNO TYPE STRING,
DISCACT_BEGIN TYPE STRING,
DISCOBJ TYPE STRING,
AB TYPE STRING,
AB_TIME TYPE STRING,
BIS TYPE STRING,
BIS_TIME TYPE STRING,
ANLAGE TYPE STRING,
EQUINR TYPE STRING,
DISCOBJTYP TYPE STRING,
DISCREASON TYPE STRING,
DISCPROCV TYPE STRING,
REFOBJTYPE TYPE STRING,
PARTNER TYPE STRING,
VKONT TYPE STRING,
CONTRACT TYPE STRING,
CONNOBJ TYPE STRING,
PREMISE TYPE STRING,
INSTLN TYPE STRING,
DEVICE TYPE STRING,
LADEMODUS TYPE STRING,
COUNTER TYPE STRING,
RECORDMODE TYPE STRING,
DISCTYPE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_BIW_ISU_DISCON_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_BIW_ISU_DISCON_STR-DISCNO sy-vline 
WA_BIW_ISU_DISCON_STR-DISCACT_BEGIN sy-vline 
WA_BIW_ISU_DISCON_STR-DISCOBJ sy-vline 
WA_BIW_ISU_DISCON_STR-AB sy-vline 
WA_BIW_ISU_DISCON_STR-AB_TIME sy-vline 
WA_BIW_ISU_DISCON_STR-BIS sy-vline 
WA_BIW_ISU_DISCON_STR-BIS_TIME sy-vline 
WA_BIW_ISU_DISCON_STR-ANLAGE sy-vline 
WA_BIW_ISU_DISCON_STR-EQUINR sy-vline 
WA_BIW_ISU_DISCON_STR-DISCOBJTYP sy-vline 
WA_BIW_ISU_DISCON_STR-DISCREASON sy-vline 
WA_BIW_ISU_DISCON_STR-DISCPROCV sy-vline 
WA_BIW_ISU_DISCON_STR-REFOBJTYPE sy-vline 
WA_BIW_ISU_DISCON_STR-PARTNER sy-vline 
WA_BIW_ISU_DISCON_STR-VKONT sy-vline 
WA_BIW_ISU_DISCON_STR-CONTRACT sy-vline 
WA_BIW_ISU_DISCON_STR-CONNOBJ sy-vline 
WA_BIW_ISU_DISCON_STR-PREMISE sy-vline 
WA_BIW_ISU_DISCON_STR-INSTLN sy-vline 
WA_BIW_ISU_DISCON_STR-DEVICE sy-vline 
WA_BIW_ISU_DISCON_STR-LADEMODUS sy-vline 
WA_BIW_ISU_DISCON_STR-COUNTER sy-vline 
WA_BIW_ISU_DISCON_STR-RECORDMODE sy-vline 
WA_BIW_ISU_DISCON_STR-DISCTYPE sy-vline      INTO ld_text SEPARATED BY SPACE.

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