ABAP Select data from SAP table SYB_XCHG_DEVICEIO 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_DEVICEIO 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_DEVICEIO. 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_DEVICEIO 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_DEVICEIO TYPE STANDARD TABLE OF SYB_XCHG_DEVICEIO,
      WA_SYB_XCHG_DEVICEIO TYPE SYB_XCHG_DEVICEIO,
      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_DEVICEIO> TYPE SYB_XCHG_DEVICEIO.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM SYB_XCHG_DEVICEIO
*  INTO TABLE @DATA(IT_SYB_XCHG_DEVICEIO2).
*--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_DEVICEIO INDEX 1 INTO DATA(WA_SYB_XCHG_DEVICEIO2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<SYB_XCHG_DEVICEIO>-DEVICEIO = 1.
<SYB_XCHG_DEVICEIO>-INSTANCEID = 1.
<SYB_XCHG_DEVICEIO>-READS = 1.
<SYB_XCHG_DEVICEIO>-APFREADS = 1.
<SYB_XCHG_DEVICEIO>-WRITES = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_SYB_XCHG_DEVICEIO-DEVSEMAPHOREREQUESTS, sy-vline,
  WA_SYB_XCHG_DEVICEIO-DEVSEMAPHOREWAITS, sy-vline,
  WA_SYB_XCHG_DEVICEIO-IOTIME, sy-vline,
  WA_SYB_XCHG_DEVICEIO-LOGICALNAME, sy-vline,
  WA_SYB_XCHG_DEVICEIO-PHYSICALNAME, sy-vline,
  WA_SYB_XCHG_DEVICEIO-TIME_PERIOD, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_SYB_XCHG_DEVICEIO 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_DEVICEIO 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_DEVICEIO INTO WA_SYB_XCHG_DEVICEIO.


*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_DEVICEIO_STR, 
DEVICEIO TYPE STRING,
INSTANCEID TYPE STRING,
READS TYPE STRING,
APFREADS TYPE STRING,
WRITES TYPE STRING,
DEVSEMAPHOREREQUESTS TYPE STRING,
DEVSEMAPHOREWAITS TYPE STRING,
IOTIME TYPE STRING,
LOGICALNAME TYPE STRING,
PHYSICALNAME TYPE STRING,
TIME_PERIOD TYPE STRING,
TIMESTAMP_TO TYPE STRING,
TIMESTAMP_FROM TYPE STRING,
SNAPSHOT_TIMESTAMP TYPE STRING,
SOURCE_HOSTNAME TYPE STRING,
AVG_IOTIME TYPE STRING,
AVG_READTIME TYPE STRING,
AVG_WRITETIME TYPE STRING,
READTIME TYPE STRING,
WRITETIME TYPE STRING,
POT_READS TYPE STRING,
POT_WRITES TYPE STRING,
POT_READTIME TYPE STRING,
POT_WRITETIME TYPE STRING,
TIME_SELECTION TYPE STRING,
FROM_DATE TYPE STRING,
FROM_TIME TYPE STRING,
TO_DATE TYPE STRING,
TO_TIME TYPE STRING,
TIME_FRAME TYPE STRING,
RANGETYPE TYPE STRING,
TIME_ZONE TYPE STRING,
GRANULARITY TYPE STRING,
TIME_RANGE_READONLY TYPE STRING,
TIME_RANGE_HIDDEN TYPE STRING,
TIME_RANGE_DESCR TYPE STRING,
CONFIRM_ENABLED TYPE STRING,
GRANULARITY_ENABLED TYPE STRING,
AGGREGATE TYPE STRING,
LOGICALNAME TYPE STRING,END OF T_EKKO_STR.
DATA: WA_SYB_XCHG_DEVICEIO_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_DEVICEIO_STR-DEVICEIO sy-vline 
WA_SYB_XCHG_DEVICEIO_STR-INSTANCEID sy-vline 
WA_SYB_XCHG_DEVICEIO_STR-READS sy-vline 
WA_SYB_XCHG_DEVICEIO_STR-APFREADS sy-vline 
WA_SYB_XCHG_DEVICEIO_STR-WRITES sy-vline 
WA_SYB_XCHG_DEVICEIO_STR-DEVSEMAPHOREREQUESTS sy-vline 
WA_SYB_XCHG_DEVICEIO_STR-DEVSEMAPHOREWAITS sy-vline 
WA_SYB_XCHG_DEVICEIO_STR-IOTIME sy-vline 
WA_SYB_XCHG_DEVICEIO_STR-LOGICALNAME sy-vline 
WA_SYB_XCHG_DEVICEIO_STR-PHYSICALNAME sy-vline 
WA_SYB_XCHG_DEVICEIO_STR-TIME_PERIOD sy-vline 
WA_SYB_XCHG_DEVICEIO_STR-TIMESTAMP_TO sy-vline 
WA_SYB_XCHG_DEVICEIO_STR-TIMESTAMP_FROM sy-vline 
WA_SYB_XCHG_DEVICEIO_STR-SNAPSHOT_TIMESTAMP sy-vline 
WA_SYB_XCHG_DEVICEIO_STR-SOURCE_HOSTNAME sy-vline 
WA_SYB_XCHG_DEVICEIO_STR-AVG_IOTIME sy-vline 
WA_SYB_XCHG_DEVICEIO_STR-AVG_READTIME sy-vline 
WA_SYB_XCHG_DEVICEIO_STR-AVG_WRITETIME sy-vline 
WA_SYB_XCHG_DEVICEIO_STR-READTIME sy-vline 
WA_SYB_XCHG_DEVICEIO_STR-WRITETIME sy-vline 
WA_SYB_XCHG_DEVICEIO_STR-POT_READS sy-vline 
WA_SYB_XCHG_DEVICEIO_STR-POT_WRITES sy-vline 
WA_SYB_XCHG_DEVICEIO_STR-POT_READTIME sy-vline 
WA_SYB_XCHG_DEVICEIO_STR-POT_WRITETIME sy-vline 
WA_SYB_XCHG_DEVICEIO_STR-TIME_SELECTION sy-vline 
WA_SYB_XCHG_DEVICEIO_STR-FROM_DATE sy-vline 
WA_SYB_XCHG_DEVICEIO_STR-FROM_TIME sy-vline 
WA_SYB_XCHG_DEVICEIO_STR-TO_DATE sy-vline 
WA_SYB_XCHG_DEVICEIO_STR-TO_TIME sy-vline 
WA_SYB_XCHG_DEVICEIO_STR-TIME_FRAME sy-vline 
WA_SYB_XCHG_DEVICEIO_STR-RANGETYPE sy-vline 
WA_SYB_XCHG_DEVICEIO_STR-TIME_ZONE sy-vline 
WA_SYB_XCHG_DEVICEIO_STR-GRANULARITY sy-vline 
WA_SYB_XCHG_DEVICEIO_STR-TIME_RANGE_READONLY sy-vline 
WA_SYB_XCHG_DEVICEIO_STR-TIME_RANGE_HIDDEN sy-vline 
WA_SYB_XCHG_DEVICEIO_STR-TIME_RANGE_DESCR sy-vline 
WA_SYB_XCHG_DEVICEIO_STR-CONFIRM_ENABLED sy-vline 
WA_SYB_XCHG_DEVICEIO_STR-GRANULARITY_ENABLED sy-vline 
WA_SYB_XCHG_DEVICEIO_STR-AGGREGATE sy-vline 
WA_SYB_XCHG_DEVICEIO_STR-LOGICALNAME sy-vline      INTO ld_text SEPARATED BY SPACE.

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