ABAP Select data from SAP table DB2DSNUP into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP DB2DSNUP 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 DB2DSNUP. 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 DB2DSNUP 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_DB2DSNUP TYPE STANDARD TABLE OF DB2DSNUP,
      WA_DB2DSNUP TYPE DB2DSNUP,
      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: <DB2DSNUP> TYPE DB2DSNUP.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_DB2DSNUP.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM DB2DSNUP
  INTO TABLE IT_DB2DSNUP.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DB2DSNUP
*  INTO TABLE @DATA(IT_DB2DSNUP2).
*--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_DB2DSNUP INDEX 1 INTO DATA(WA_DB2DSNUP2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_DB2DSNUP ASSIGNING <DB2DSNUP>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DB2DSNUP>-UTILITY_ID = 1.
<DB2DSNUP>-RESTART = 1.
<DB2DSNUP>-UTSTMT = 1.
<DB2DSNUP>-RETCODE = 1.
<DB2DSNUP>-UTIL_NAME = 1.

ENDLOOP.

LOOP AT IT_DB2DSNUP INTO WA_DB2DSNUP.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DB2DSNUP-RECDSN, sy-vline,
  WA_DB2DSNUP-RECDEVT, sy-vline,
  WA_DB2DSNUP-RECSPACE, sy-vline,
  WA_DB2DSNUP-DISCDSN, sy-vline,
  WA_DB2DSNUP-DISCDEVT, sy-vline,
  WA_DB2DSNUP-DISCSPACE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DB2DSNUP 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_DB2DSNUP 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_DB2DSNUP INTO WA_DB2DSNUP.


*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_DB2DSNUP_STR, 
UTILITY_ID TYPE STRING,
RESTART TYPE STRING,
UTSTMT TYPE STRING,
RETCODE TYPE STRING,
UTIL_NAME TYPE STRING,
RECDSN TYPE STRING,
RECDEVT TYPE STRING,
RECSPACE TYPE STRING,
DISCDSN TYPE STRING,
DISCDEVT TYPE STRING,
DISCSPACE TYPE STRING,
PNCHDSN TYPE STRING,
PNCHDEVT TYPE STRING,
PNCHSPACE TYPE STRING,
COPYDSN1 TYPE STRING,
COPYDEVT1 TYPE STRING,
COPYSPACE1 TYPE STRING,
COPYDSN2 TYPE STRING,
COPYDEVT2 TYPE STRING,
COPYSPACE2 TYPE STRING,
RCPYDSN1 TYPE STRING,
RCPYDEVT1 TYPE STRING,
RCPYSPACE1 TYPE STRING,
RCPYDSN2 TYPE STRING,
RCPYDEVT2 TYPE STRING,
RCPYSPACE2 TYPE STRING,
MAPDSN TYPE STRING,
MAPDEVT TYPE STRING,
MAPSPACE TYPE STRING,
ERRDSN TYPE STRING,
ERRDEVT TYPE STRING,
ERRSPACE TYPE STRING,
WORKDSN1 TYPE STRING,
WORKDEVT1 TYPE STRING,
WORKSPACE1 TYPE STRING,
WORKDSN2 TYPE STRING,
WORKDEVT2 TYPE STRING,
WORKSPACE2 TYPE STRING,
FILTRDSN TYPE STRING,
FILTRDEVT TYPE STRING,
FILTRSPACE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DB2DSNUP_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_DB2DSNUP_STR-UTILITY_ID sy-vline 
WA_DB2DSNUP_STR-RESTART sy-vline 
WA_DB2DSNUP_STR-UTSTMT sy-vline 
WA_DB2DSNUP_STR-RETCODE sy-vline 
WA_DB2DSNUP_STR-UTIL_NAME sy-vline 
WA_DB2DSNUP_STR-RECDSN sy-vline 
WA_DB2DSNUP_STR-RECDEVT sy-vline 
WA_DB2DSNUP_STR-RECSPACE sy-vline 
WA_DB2DSNUP_STR-DISCDSN sy-vline 
WA_DB2DSNUP_STR-DISCDEVT sy-vline 
WA_DB2DSNUP_STR-DISCSPACE sy-vline 
WA_DB2DSNUP_STR-PNCHDSN sy-vline 
WA_DB2DSNUP_STR-PNCHDEVT sy-vline 
WA_DB2DSNUP_STR-PNCHSPACE sy-vline 
WA_DB2DSNUP_STR-COPYDSN1 sy-vline 
WA_DB2DSNUP_STR-COPYDEVT1 sy-vline 
WA_DB2DSNUP_STR-COPYSPACE1 sy-vline 
WA_DB2DSNUP_STR-COPYDSN2 sy-vline 
WA_DB2DSNUP_STR-COPYDEVT2 sy-vline 
WA_DB2DSNUP_STR-COPYSPACE2 sy-vline 
WA_DB2DSNUP_STR-RCPYDSN1 sy-vline 
WA_DB2DSNUP_STR-RCPYDEVT1 sy-vline 
WA_DB2DSNUP_STR-RCPYSPACE1 sy-vline 
WA_DB2DSNUP_STR-RCPYDSN2 sy-vline 
WA_DB2DSNUP_STR-RCPYDEVT2 sy-vline 
WA_DB2DSNUP_STR-RCPYSPACE2 sy-vline 
WA_DB2DSNUP_STR-MAPDSN sy-vline 
WA_DB2DSNUP_STR-MAPDEVT sy-vline 
WA_DB2DSNUP_STR-MAPSPACE sy-vline 
WA_DB2DSNUP_STR-ERRDSN sy-vline 
WA_DB2DSNUP_STR-ERRDEVT sy-vline 
WA_DB2DSNUP_STR-ERRSPACE sy-vline 
WA_DB2DSNUP_STR-WORKDSN1 sy-vline 
WA_DB2DSNUP_STR-WORKDEVT1 sy-vline 
WA_DB2DSNUP_STR-WORKSPACE1 sy-vline 
WA_DB2DSNUP_STR-WORKDSN2 sy-vline 
WA_DB2DSNUP_STR-WORKDEVT2 sy-vline 
WA_DB2DSNUP_STR-WORKSPACE2 sy-vline 
WA_DB2DSNUP_STR-FILTRDSN sy-vline 
WA_DB2DSNUP_STR-FILTRDEVT sy-vline 
WA_DB2DSNUP_STR-FILTRSPACE sy-vline      INTO ld_text SEPARATED BY SPACE.

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