ABAP Select data from SAP table SDB_SINGLE_VOLUME into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM SDB_SINGLE_VOLUME
*  INTO TABLE @DATA(IT_SDB_SINGLE_VOLUME2).
*--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_SDB_SINGLE_VOLUME INDEX 1 INTO DATA(WA_SDB_SINGLE_VOLUME2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<SDB_SINGLE_VOLUME>-VOLTYPE = 1.
<SDB_SINGLE_VOLUME>-NAME = 1.
<SDB_SINGLE_VOLUME>-ID = 1.
<SDB_SINGLE_VOLUME>-SIZE_KB = 1.
<SDB_SINGLE_VOLUME>-DISPLAY_SIZE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_SDB_SINGLE_VOLUME-SCALES_SIZE, sy-vline,
  WA_SDB_SINGLE_VOLUME-DISPLAY_SCALE, sy-vline,
  WA_SDB_SINGLE_VOLUME-LOG_PARTITION, sy-vline,
  WA_SDB_SINGLE_VOLUME-DEVICE, sy-vline,
  WA_SDB_SINGLE_VOLUME-DEV_TYPE, sy-vline,
  WA_SDB_SINGLE_VOLUME-DEV_TYPES, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_SDB_SINGLE_VOLUME 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_SDB_SINGLE_VOLUME 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_SDB_SINGLE_VOLUME INTO WA_SDB_SINGLE_VOLUME.


*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_SDB_SINGLE_VOLUME_STR, 
VOLTYPE TYPE STRING,
NAME TYPE STRING,
ID TYPE STRING,
SIZE_KB TYPE STRING,
DISPLAY_SIZE TYPE STRING,
SCALES_SIZE TYPE STRING,
DISPLAY_SCALE TYPE STRING,
LOG_PARTITION TYPE STRING,
DEVICE TYPE STRING,
DEV_TYPE TYPE STRING,
DEV_TYPES TYPE STRING,
MDEVICE TYPE STRING,
MDEV_TYPE TYPE STRING,
MDEV_TYPES TYPE STRING,
OLD_DEVICE TYPE STRING,
OLD_MDEVICE TYPE STRING,
TITLE_ACTION TYPE STRING,
TEXT_BUTTON_ACTION TYPE STRING,
TEXT_MIRROR TYPE STRING,
LABEL_NAME TYPE STRING,
LABEL_SCALE TYPE STRING,
LABEL_LOG_PARTITION TYPE STRING,
LABEL_DEVICE TYPE STRING,
LABEL_DEV_TYPE TYPE STRING,
LABEL_MDEVICE TYPE STRING,
LABEL_MDEV_TYPE TYPE STRING,
LABEL_OLD_DEVICE TYPE STRING,
LABEL_OLD_MDEVICE TYPE STRING,
LABEL_DISP_SIZE TYPE STRING,
ACTIVE_DEVICE TYPE STRING,
ACTIVE_OTHERS TYPE STRING,
ACTIVE_MDEVICE TYPE STRING,
ACTIVE_MOTHERS TYPE STRING,
READ_ONLY_DEV_TYPE TYPE STRING,
READ_ONLY_MDEV_TYPE TYPE STRING,
DISP_MIRROR TYPE STRING,
DISP_OLD_DEVICE TYPE STRING,
DISP_OLD_MDEVICE TYPE STRING,
DISP_LOG_PARTITION TYPE STRING,END OF T_EKKO_STR.
DATA: WA_SDB_SINGLE_VOLUME_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_SDB_SINGLE_VOLUME_STR-VOLTYPE sy-vline 
WA_SDB_SINGLE_VOLUME_STR-NAME sy-vline 
WA_SDB_SINGLE_VOLUME_STR-ID sy-vline 
WA_SDB_SINGLE_VOLUME_STR-SIZE_KB sy-vline 
WA_SDB_SINGLE_VOLUME_STR-DISPLAY_SIZE sy-vline 
WA_SDB_SINGLE_VOLUME_STR-SCALES_SIZE sy-vline 
WA_SDB_SINGLE_VOLUME_STR-DISPLAY_SCALE sy-vline 
WA_SDB_SINGLE_VOLUME_STR-LOG_PARTITION sy-vline 
WA_SDB_SINGLE_VOLUME_STR-DEVICE sy-vline 
WA_SDB_SINGLE_VOLUME_STR-DEV_TYPE sy-vline 
WA_SDB_SINGLE_VOLUME_STR-DEV_TYPES sy-vline 
WA_SDB_SINGLE_VOLUME_STR-MDEVICE sy-vline 
WA_SDB_SINGLE_VOLUME_STR-MDEV_TYPE sy-vline 
WA_SDB_SINGLE_VOLUME_STR-MDEV_TYPES sy-vline 
WA_SDB_SINGLE_VOLUME_STR-OLD_DEVICE sy-vline 
WA_SDB_SINGLE_VOLUME_STR-OLD_MDEVICE sy-vline 
WA_SDB_SINGLE_VOLUME_STR-TITLE_ACTION sy-vline 
WA_SDB_SINGLE_VOLUME_STR-TEXT_BUTTON_ACTION sy-vline 
WA_SDB_SINGLE_VOLUME_STR-TEXT_MIRROR sy-vline 
WA_SDB_SINGLE_VOLUME_STR-LABEL_NAME sy-vline 
WA_SDB_SINGLE_VOLUME_STR-LABEL_SCALE sy-vline 
WA_SDB_SINGLE_VOLUME_STR-LABEL_LOG_PARTITION sy-vline 
WA_SDB_SINGLE_VOLUME_STR-LABEL_DEVICE sy-vline 
WA_SDB_SINGLE_VOLUME_STR-LABEL_DEV_TYPE sy-vline 
WA_SDB_SINGLE_VOLUME_STR-LABEL_MDEVICE sy-vline 
WA_SDB_SINGLE_VOLUME_STR-LABEL_MDEV_TYPE sy-vline 
WA_SDB_SINGLE_VOLUME_STR-LABEL_OLD_DEVICE sy-vline 
WA_SDB_SINGLE_VOLUME_STR-LABEL_OLD_MDEVICE sy-vline 
WA_SDB_SINGLE_VOLUME_STR-LABEL_DISP_SIZE sy-vline 
WA_SDB_SINGLE_VOLUME_STR-ACTIVE_DEVICE sy-vline 
WA_SDB_SINGLE_VOLUME_STR-ACTIVE_OTHERS sy-vline 
WA_SDB_SINGLE_VOLUME_STR-ACTIVE_MDEVICE sy-vline 
WA_SDB_SINGLE_VOLUME_STR-ACTIVE_MOTHERS sy-vline 
WA_SDB_SINGLE_VOLUME_STR-READ_ONLY_DEV_TYPE sy-vline 
WA_SDB_SINGLE_VOLUME_STR-READ_ONLY_MDEV_TYPE sy-vline 
WA_SDB_SINGLE_VOLUME_STR-DISP_MIRROR sy-vline 
WA_SDB_SINGLE_VOLUME_STR-DISP_OLD_DEVICE sy-vline 
WA_SDB_SINGLE_VOLUME_STR-DISP_OLD_MDEVICE sy-vline 
WA_SDB_SINGLE_VOLUME_STR-DISP_LOG_PARTITION sy-vline      INTO ld_text SEPARATED BY SPACE.

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