ABAP Select data from SAP table DB2LOTRS into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP DB2LOTRS 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 DB2LOTRS. 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 DB2LOTRS 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_DB2LOTRS TYPE STANDARD TABLE OF DB2LOTRS,
      WA_DB2LOTRS TYPE DB2LOTRS,
      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: <DB2LOTRS> TYPE DB2LOTRS.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_DB2LOTRS.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM DB2LOTRS
  INTO TABLE IT_DB2LOTRS.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DB2LOTRS
*  INTO TABLE @DATA(IT_DB2LOTRS2).
*--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_DB2LOTRS INDEX 1 INTO DATA(WA_DB2LOTRS2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_DB2LOTRS ASSIGNING <DB2LOTRS>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DB2LOTRS>-LOTRSSSID = 1.
<DB2LOTRS>-LOTRSLUUV = 1.
<DB2LOTRS>-LOTRSDATE = 1.
<DB2LOTRS>-LOTRSTIME = 1.
<DB2LOTRS>-LOTRSMSEC = 1.

ENDLOOP.

LOOP AT IT_DB2LOTRS INTO WA_DB2LOTRS.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DB2LOTRS-LOTRSPLAN, sy-vline,
  WA_DB2LOTRS-LOTRSAID, sy-vline,
  WA_DB2LOTRS-LOTRSCN, sy-vline,
  WA_DB2LOTRS-LOTRSCV, sy-vline,
  WA_DB2LOTRS-LOTRSEUID, sy-vline,
  WA_DB2LOTRS-LOTRSEUTX, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DB2LOTRS 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_DB2LOTRS 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_DB2LOTRS INTO WA_DB2LOTRS.


*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_DB2LOTRS_STR, 
LOTRSSSID TYPE STRING,
LOTRSLUUV TYPE STRING,
LOTRSDATE TYPE STRING,
LOTRSTIME TYPE STRING,
LOTRSMSEC TYPE STRING,
LOTRSPLAN TYPE STRING,
LOTRSAID TYPE STRING,
LOTRSCN TYPE STRING,
LOTRSCV TYPE STRING,
LOTRSEUID TYPE STRING,
LOTRSEUTX TYPE STRING,
LOTRSEUWN TYPE STRING,
LOTRSDSGN TYPE STRING,
LOTRSMMEMN TYPE STRING,
LOTRSNU TYPE STRING,
LOTRSFR TYPE STRING,
LOTRSKD TYPE STRING,
LOTRSKP TYPE STRING,
LOTRSK1 TYPE STRING,
LOTRSK2 TYPE STRING,
LOTRSWU TYPE STRING,
LOTRSWS TYPE STRING,
LOTRSWD TYPE STRING,
LOTRSWF TYPE STRING,
LOTRSTI TYPE STRING,
LOTRSTC TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DB2LOTRS_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_DB2LOTRS_STR-LOTRSSSID sy-vline 
WA_DB2LOTRS_STR-LOTRSLUUV sy-vline 
WA_DB2LOTRS_STR-LOTRSDATE sy-vline 
WA_DB2LOTRS_STR-LOTRSTIME sy-vline 
WA_DB2LOTRS_STR-LOTRSMSEC sy-vline 
WA_DB2LOTRS_STR-LOTRSPLAN sy-vline 
WA_DB2LOTRS_STR-LOTRSAID sy-vline 
WA_DB2LOTRS_STR-LOTRSCN sy-vline 
WA_DB2LOTRS_STR-LOTRSCV sy-vline 
WA_DB2LOTRS_STR-LOTRSEUID sy-vline 
WA_DB2LOTRS_STR-LOTRSEUTX sy-vline 
WA_DB2LOTRS_STR-LOTRSEUWN sy-vline 
WA_DB2LOTRS_STR-LOTRSDSGN sy-vline 
WA_DB2LOTRS_STR-LOTRSMMEMN sy-vline 
WA_DB2LOTRS_STR-LOTRSNU sy-vline 
WA_DB2LOTRS_STR-LOTRSFR sy-vline 
WA_DB2LOTRS_STR-LOTRSKD sy-vline 
WA_DB2LOTRS_STR-LOTRSKP sy-vline 
WA_DB2LOTRS_STR-LOTRSK1 sy-vline 
WA_DB2LOTRS_STR-LOTRSK2 sy-vline 
WA_DB2LOTRS_STR-LOTRSWU sy-vline 
WA_DB2LOTRS_STR-LOTRSWS sy-vline 
WA_DB2LOTRS_STR-LOTRSWD sy-vline 
WA_DB2LOTRS_STR-LOTRSWF sy-vline 
WA_DB2LOTRS_STR-LOTRSTI sy-vline 
WA_DB2LOTRS_STR-LOTRSTC sy-vline      INTO ld_text SEPARATED BY SPACE.

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