ABAP Select data from SAP table DB2LOTHWI into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP DB2LOTHWI 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 DB2LOTHWI. 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 DB2LOTHWI 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_DB2LOTHWI TYPE STANDARD TABLE OF DB2LOTHWI,
      WA_DB2LOTHWI TYPE DB2LOTHWI,
      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: <DB2LOTHWI> TYPE DB2LOTHWI.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_DB2LOTHWI.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM DB2LOTHWI
  INTO TABLE IT_DB2LOTHWI.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DB2LOTHWI
*  INTO TABLE @DATA(IT_DB2LOTHWI2).
*--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_DB2LOTHWI INDEX 1 INTO DATA(WA_DB2LOTHWI2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_DB2LOTHWI ASSIGNING <DB2LOTHWI>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DB2LOTHWI>-LOTHWSSID = 1.
<DB2LOTHWI>-LOTHWLUUV = 1.
<DB2LOTHWI>-LOTHWDATE = 1.
<DB2LOTHWI>-LOTHWTIME = 1.
<DB2LOTHWI>-LOTHWMSEC = 1.

ENDLOOP.

LOOP AT IT_DB2LOTHWI INTO WA_DB2LOTHWI.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DB2LOTHWI-LOTHWCNT, sy-vline,
  WA_DB2LOTHWI-LOTHWHW, sy-vline,
  WA_DB2LOTHWI-LOTHWHP, sy-vline,
  WA_DB2LOTHWI-LOTHWHB, sy-vline,
  WA_DB2LOTHWI-LOTHWHN, sy-vline,
  WA_DB2LOTHWI-LOTHWHR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DB2LOTHWI 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_DB2LOTHWI 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_DB2LOTHWI INTO WA_DB2LOTHWI.


*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_DB2LOTHWI_STR, 
LOTHWSSID TYPE STRING,
LOTHWLUUV TYPE STRING,
LOTHWDATE TYPE STRING,
LOTHWTIME TYPE STRING,
LOTHWMSEC TYPE STRING,
LOTHWCNT TYPE STRING,
LOTHWHW TYPE STRING,
LOTHWHP TYPE STRING,
LOTHWHB TYPE STRING,
LOTHWHN TYPE STRING,
LOTHWHR TYPE STRING,
LOTHWHC TYPE STRING,
LOTHWHJ TYPE STRING,
LOTHWHK TYPE STRING,
LOTHWHLUUV TYPE STRING,
LOTHWHT TYPE STRING,
LOTHWHI TYPE STRING,
LOTHWHS TYPE STRING,
LOTHWHD TYPE STRING,
LOTHWHF TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DB2LOTHWI_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_DB2LOTHWI_STR-LOTHWSSID sy-vline 
WA_DB2LOTHWI_STR-LOTHWLUUV sy-vline 
WA_DB2LOTHWI_STR-LOTHWDATE sy-vline 
WA_DB2LOTHWI_STR-LOTHWTIME sy-vline 
WA_DB2LOTHWI_STR-LOTHWMSEC sy-vline 
WA_DB2LOTHWI_STR-LOTHWCNT sy-vline 
WA_DB2LOTHWI_STR-LOTHWHW sy-vline 
WA_DB2LOTHWI_STR-LOTHWHP sy-vline 
WA_DB2LOTHWI_STR-LOTHWHB sy-vline 
WA_DB2LOTHWI_STR-LOTHWHN sy-vline 
WA_DB2LOTHWI_STR-LOTHWHR sy-vline 
WA_DB2LOTHWI_STR-LOTHWHC sy-vline 
WA_DB2LOTHWI_STR-LOTHWHJ sy-vline 
WA_DB2LOTHWI_STR-LOTHWHK sy-vline 
WA_DB2LOTHWI_STR-LOTHWHLUUV sy-vline 
WA_DB2LOTHWI_STR-LOTHWHT sy-vline 
WA_DB2LOTHWI_STR-LOTHWHI sy-vline 
WA_DB2LOTHWI_STR-LOTHWHS sy-vline 
WA_DB2LOTHWI_STR-LOTHWHD sy-vline 
WA_DB2LOTHWI_STR-LOTHWHF sy-vline      INTO ld_text SEPARATED BY SPACE.

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