ABAP Select data from SAP table OS390_POL into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP OS390_POL 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 OS390_POL. 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 OS390_POL 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_OS390_POL TYPE STANDARD TABLE OF OS390_POL,
      WA_OS390_POL TYPE OS390_POL,
      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: <OS390_POL> TYPE OS390_POL.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_OS390_POL.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM OS390_POL
  INTO TABLE IT_OS390_POL.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM OS390_POL
*  INTO TABLE @DATA(IT_OS390_POL2).
*--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_OS390_POL INDEX 1 INTO DATA(WA_OS390_POL2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_OS390_POL ASSIGNING <OS390_POL>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<OS390_POL>-TYPE = 1.
<OS390_POL>-SUBTYPE = 1.
<OS390_POL>-SERIALNR = 1.
<OS390_POL>-SYSTEMNAME = 1.
<OS390_POL>-POLICYNAME = 1.

ENDLOOP.

LOOP AT IT_OS390_POL INTO WA_OS390_POL.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_OS390_POL-POLICYDES, sy-vline,
  WA_OS390_POL-ADMINNAME, sy-vline,
  WA_OS390_POL-SYSTEMMODE, sy-vline,
  WA_OS390_POL-STARTTIME, sy-vline,
  WA_OS390_POL-ENDTIME, sy-vline,
  WA_OS390_POL-DURATION, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_OS390_POL 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_OS390_POL 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_OS390_POL INTO WA_OS390_POL.


*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_OS390_POL_STR, 
TYPE TYPE STRING,
SUBTYPE TYPE STRING,
SERIALNR TYPE STRING,
SYSTEMNAME TYPE STRING,
POLICYNAME TYPE STRING,
POLICYDES TYPE STRING,
ADMINNAME TYPE STRING,
SYSTEMMODE TYPE STRING,
STARTTIME TYPE STRING,
ENDTIME TYPE STRING,
DURATION TYPE STRING,
MINTIME TYPE STRING,
STATUS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_OS390_POL_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_OS390_POL_STR-TYPE sy-vline 
WA_OS390_POL_STR-SUBTYPE sy-vline 
WA_OS390_POL_STR-SERIALNR sy-vline 
WA_OS390_POL_STR-SYSTEMNAME sy-vline 
WA_OS390_POL_STR-POLICYNAME sy-vline 
WA_OS390_POL_STR-POLICYDES sy-vline 
WA_OS390_POL_STR-ADMINNAME sy-vline 
WA_OS390_POL_STR-SYSTEMMODE sy-vline 
WA_OS390_POL_STR-STARTTIME sy-vline 
WA_OS390_POL_STR-ENDTIME sy-vline 
WA_OS390_POL_STR-DURATION sy-vline 
WA_OS390_POL_STR-MINTIME sy-vline 
WA_OS390_POL_STR-STATUS sy-vline      INTO ld_text SEPARATED BY SPACE.

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