ABAP Select data from SAP table DB2SUSCRN into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP DB2SUSCRN 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 DB2SUSCRN. 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 DB2SUSCRN 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_DB2SUSCRN TYPE STANDARD TABLE OF DB2SUSCRN,
      WA_DB2SUSCRN TYPE DB2SUSCRN,
      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: <DB2SUSCRN> TYPE DB2SUSCRN.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_DB2SUSCRN.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM DB2SUSCRN
  INTO TABLE IT_DB2SUSCRN.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DB2SUSCRN
*  INTO TABLE @DATA(IT_DB2SUSCRN2).
*--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_DB2SUSCRN INDEX 1 INTO DATA(WA_DB2SUSCRN2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_DB2SUSCRN ASSIGNING <DB2SUSCRN>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DB2SUSCRN>-SUBSYSID = 1.
<DB2SUSCRN>-SAMPDATE = 1.
<DB2SUSCRN>-SAMPTIME = 1.
<DB2SUSCRN>-SAMPMODUS = 1.
<DB2SUSCRN>-RESTIME = 1.

ENDLOOP.

LOOP AT IT_DB2SUSCRN INTO WA_DB2SUSCRN.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DB2SUSCRN-RESDATE, sy-vline,
  WA_DB2SUSCRN-REFTIME, sy-vline,
  WA_DB2SUSCRN-REFDATE, sy-vline,
  WA_DB2SUSCRN-TINTERVAL, sy-vline,
  WA_DB2SUSCRN-DBSTATIME, sy-vline,
  WA_DB2SUSCRN-DBSTADATE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DB2SUSCRN 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_DB2SUSCRN 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_DB2SUSCRN INTO WA_DB2SUSCRN.


*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_DB2SUSCRN_STR, 
SUBSYSID TYPE STRING,
SAMPDATE TYPE STRING,
SAMPTIME TYPE STRING,
SAMPMODUS TYPE STRING,
RESTIME TYPE STRING,
RESDATE TYPE STRING,
REFTIME TYPE STRING,
REFDATE TYPE STRING,
TINTERVAL TYPE STRING,
DBSTATIME TYPE STRING,
DBSTADATE TYPE STRING,
DAYINTVAL TYPE STRING,
DS_GROUP TYPE STRING,
DS_MEMBER TYPE STRING,
DBVALFRT TYPE STRING,
DBVALFRD TYPE STRING,
DBVALTOT TYPE STRING,
DBVALTOD TYPE STRING,
RESTHTIME TYPE STRING,
RESTHDATE TYPE STRING,
SAMPMODUST TYPE STRING,
SAMPDATET TYPE STRING,
SAMPTIMET TYPE STRING,
DBSTATIMET TYPE STRING,
DBSTADATET TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DB2SUSCRN_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_DB2SUSCRN_STR-SUBSYSID sy-vline 
WA_DB2SUSCRN_STR-SAMPDATE sy-vline 
WA_DB2SUSCRN_STR-SAMPTIME sy-vline 
WA_DB2SUSCRN_STR-SAMPMODUS sy-vline 
WA_DB2SUSCRN_STR-RESTIME sy-vline 
WA_DB2SUSCRN_STR-RESDATE sy-vline 
WA_DB2SUSCRN_STR-REFTIME sy-vline 
WA_DB2SUSCRN_STR-REFDATE sy-vline 
WA_DB2SUSCRN_STR-TINTERVAL sy-vline 
WA_DB2SUSCRN_STR-DBSTATIME sy-vline 
WA_DB2SUSCRN_STR-DBSTADATE sy-vline 
WA_DB2SUSCRN_STR-DAYINTVAL sy-vline 
WA_DB2SUSCRN_STR-DS_GROUP sy-vline 
WA_DB2SUSCRN_STR-DS_MEMBER sy-vline 
WA_DB2SUSCRN_STR-DBVALFRT sy-vline 
WA_DB2SUSCRN_STR-DBVALFRD sy-vline 
WA_DB2SUSCRN_STR-DBVALTOT sy-vline 
WA_DB2SUSCRN_STR-DBVALTOD sy-vline 
WA_DB2SUSCRN_STR-RESTHTIME sy-vline 
WA_DB2SUSCRN_STR-RESTHDATE sy-vline 
WA_DB2SUSCRN_STR-SAMPMODUST sy-vline 
WA_DB2SUSCRN_STR-SAMPDATET sy-vline 
WA_DB2SUSCRN_STR-SAMPTIMET sy-vline 
WA_DB2SUSCRN_STR-DBSTATIMET sy-vline 
WA_DB2SUSCRN_STR-DBSTADATET sy-vline      INTO ld_text SEPARATED BY SPACE.

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