ABAP Select data from SAP table SYB_XCHG_DEVICE into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM SYB_XCHG_DEVICE
*  INTO TABLE @DATA(IT_SYB_XCHG_DEVICE2).
*--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_SYB_XCHG_DEVICE INDEX 1 INTO DATA(WA_SYB_XCHG_DEVICE2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<SYB_XCHG_DEVICE>-DEVICE = 1.
<SYB_XCHG_DEVICE>-LOW = 1.
<SYB_XCHG_DEVICE>-HIGH = 1.
<SYB_XCHG_DEVICE>-STATUS = 1.
<SYB_XCHG_DEVICE>-CNTRLTYPE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_SYB_XCHG_DEVICE-NAME, sy-vline,
  WA_SYB_XCHG_DEVICE-PHYNAME, sy-vline,
  WA_SYB_XCHG_DEVICE-MIRRORNAME, sy-vline,
  WA_SYB_XCHG_DEVICE-VDEVNO, sy-vline,
  WA_SYB_XCHG_DEVICE-CRDATE, sy-vline,
  WA_SYB_XCHG_DEVICE-RESIZEDATE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_SYB_XCHG_DEVICE 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_SYB_XCHG_DEVICE 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_SYB_XCHG_DEVICE INTO WA_SYB_XCHG_DEVICE.


*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_SYB_XCHG_DEVICE_STR, 
DEVICE TYPE STRING,
LOW TYPE STRING,
HIGH TYPE STRING,
STATUS TYPE STRING,
CNTRLTYPE TYPE STRING,
NAME TYPE STRING,
PHYNAME TYPE STRING,
MIRRORNAME TYPE STRING,
VDEVNO TYPE STRING,
CRDATE TYPE STRING,
RESIZEDATE TYPE STRING,
STATUS2 TYPE STRING,
INSTANCEID TYPE STRING,
DEVSIZE TYPE STRING,
USED_SIZE TYPE STRING,
FREE_SIZE TYPE STRING,
DIRECTIO TYPE STRING,
DSYNC TYPE STRING,
SKIP_HEADER TYPE STRING,
DEFAULT_DISK TYPE STRING,
BGCOLOR TYPE STRING,
AEXP_GROWBY_VALUE TYPE STRING,
AEXP_GROWBY_UNIT TYPE STRING,
AEXP_MAXSIZE_MB TYPE STRING,
AEXP_INH_FROM_DEFAULT TYPE STRING,
CLASS TYPE STRING,
DEVICES_TAB TYPE STRING,END OF T_EKKO_STR.
DATA: WA_SYB_XCHG_DEVICE_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_SYB_XCHG_DEVICE_STR-DEVICE sy-vline 
WA_SYB_XCHG_DEVICE_STR-LOW sy-vline 
WA_SYB_XCHG_DEVICE_STR-HIGH sy-vline 
WA_SYB_XCHG_DEVICE_STR-STATUS sy-vline 
WA_SYB_XCHG_DEVICE_STR-CNTRLTYPE sy-vline 
WA_SYB_XCHG_DEVICE_STR-NAME sy-vline 
WA_SYB_XCHG_DEVICE_STR-PHYNAME sy-vline 
WA_SYB_XCHG_DEVICE_STR-MIRRORNAME sy-vline 
WA_SYB_XCHG_DEVICE_STR-VDEVNO sy-vline 
WA_SYB_XCHG_DEVICE_STR-CRDATE sy-vline 
WA_SYB_XCHG_DEVICE_STR-RESIZEDATE sy-vline 
WA_SYB_XCHG_DEVICE_STR-STATUS2 sy-vline 
WA_SYB_XCHG_DEVICE_STR-INSTANCEID sy-vline 
WA_SYB_XCHG_DEVICE_STR-DEVSIZE sy-vline 
WA_SYB_XCHG_DEVICE_STR-USED_SIZE sy-vline 
WA_SYB_XCHG_DEVICE_STR-FREE_SIZE sy-vline 
WA_SYB_XCHG_DEVICE_STR-DIRECTIO sy-vline 
WA_SYB_XCHG_DEVICE_STR-DSYNC sy-vline 
WA_SYB_XCHG_DEVICE_STR-SKIP_HEADER sy-vline 
WA_SYB_XCHG_DEVICE_STR-DEFAULT_DISK sy-vline 
WA_SYB_XCHG_DEVICE_STR-BGCOLOR sy-vline 
WA_SYB_XCHG_DEVICE_STR-AEXP_GROWBY_VALUE sy-vline 
WA_SYB_XCHG_DEVICE_STR-AEXP_GROWBY_UNIT sy-vline 
WA_SYB_XCHG_DEVICE_STR-AEXP_MAXSIZE_MB sy-vline 
WA_SYB_XCHG_DEVICE_STR-AEXP_INH_FROM_DEFAULT sy-vline 
WA_SYB_XCHG_DEVICE_STR-CLASS sy-vline 
WA_SYB_XCHG_DEVICE_STR-DEVICES_TAB sy-vline      INTO ld_text SEPARATED BY SPACE.

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