ABAP Select data from SAP table ADA_IO into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ADA_IO
*  INTO TABLE @DATA(IT_ADA_IO2).
*--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_ADA_IO INDEX 1 INTO DATA(WA_ADA_IO2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ADA_IO>-DEVID = 1.
<ADA_IO>-DEVNAME = 1.
<ADA_IO>-PHYREADS = 1.
<ADA_IO>-PHYWRITES = 1.
<ADA_IO>-BUPREADS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ADA_IO-BUPWRITES, sy-vline,
  WA_ADA_IO-BUPPAGES, sy-vline,
  WA_ADA_IO-QUEUELEN, sy-vline,
  WA_ADA_IO-QUEUEMAX, sy-vline,
  WA_ADA_IO-READS, sy-vline,
  WA_ADA_IO-READPAGES, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ADA_IO 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_ADA_IO 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_ADA_IO INTO WA_ADA_IO.


*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_ADA_IO_STR, 
DEVID TYPE STRING,
DEVNAME TYPE STRING,
PHYREADS TYPE STRING,
PHYWRITES TYPE STRING,
BUPREADS TYPE STRING,
BUPWRITES TYPE STRING,
BUPPAGES TYPE STRING,
QUEUELEN TYPE STRING,
QUEUEMAX TYPE STRING,
READS TYPE STRING,
READPAGES TYPE STRING,
WRITES TYPE STRING,
WRITEPAGES TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ADA_IO_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_ADA_IO_STR-DEVID sy-vline 
WA_ADA_IO_STR-DEVNAME sy-vline 
WA_ADA_IO_STR-PHYREADS sy-vline 
WA_ADA_IO_STR-PHYWRITES sy-vline 
WA_ADA_IO_STR-BUPREADS sy-vline 
WA_ADA_IO_STR-BUPWRITES sy-vline 
WA_ADA_IO_STR-BUPPAGES sy-vline 
WA_ADA_IO_STR-QUEUELEN sy-vline 
WA_ADA_IO_STR-QUEUEMAX sy-vline 
WA_ADA_IO_STR-READS sy-vline 
WA_ADA_IO_STR-READPAGES sy-vline 
WA_ADA_IO_STR-WRITES sy-vline 
WA_ADA_IO_STR-WRITEPAGES sy-vline      INTO ld_text SEPARATED BY SPACE.

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