ABAP Select data from SAP table DB2QLOTHW into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP DB2QLOTHW 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 DB2QLOTHW. 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 DB2QLOTHW 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_DB2QLOTHW TYPE STANDARD TABLE OF DB2QLOTHW,
      WA_DB2QLOTHW TYPE DB2QLOTHW,
      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: <DB2QLOTHW> TYPE DB2QLOTHW.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_DB2QLOTHW.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM DB2QLOTHW
  INTO TABLE IT_DB2QLOTHW.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DB2QLOTHW
*  INTO TABLE @DATA(IT_DB2QLOTHW2).
*--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_DB2QLOTHW INDEX 1 INTO DATA(WA_DB2QLOTHW2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_DB2QLOTHW ASSIGNING <DB2QLOTHW>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DB2QLOTHW>-LOTHWSSID = 1.
<DB2QLOTHW>-LOTHWLUUV = 1.
<DB2QLOTHW>-LOTHWDATE = 1.
<DB2QLOTHW>-LOTHWTIME = 1.
<DB2QLOTHW>-LOTHWMSEC = 1.

ENDLOOP.

LOOP AT IT_DB2QLOTHW INTO WA_DB2QLOTHW.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DB2QLOTHW-LOTHWCNT, sy-vline,
  WA_DB2QLOTHW-LOTHWHW, sy-vline,
  WA_DB2QLOTHW-LOTHWHP, sy-vline,
  WA_DB2QLOTHW-LOTHWHB, sy-vline,
  WA_DB2QLOTHW-LOTHWHN, sy-vline,
  WA_DB2QLOTHW-LOTHWHR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DB2QLOTHW 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_DB2QLOTHW 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_DB2QLOTHW INTO WA_DB2QLOTHW.


*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_DB2QLOTHW_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,
LOTHWACCT TYPE STRING,
LOTHWHLUUV TYPE STRING,
LOTHWHT TYPE STRING,
LOTHWHI TYPE STRING,
LOTHWHS TYPE STRING,
LOTHWHD TYPE STRING,
LOTHWHF TYPE STRING,
LOTHWSTID TYPE STRING,
RZ20 TYPE STRING,
E2E TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DB2QLOTHW_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_DB2QLOTHW_STR-LOTHWSSID sy-vline 
WA_DB2QLOTHW_STR-LOTHWLUUV sy-vline 
WA_DB2QLOTHW_STR-LOTHWDATE sy-vline 
WA_DB2QLOTHW_STR-LOTHWTIME sy-vline 
WA_DB2QLOTHW_STR-LOTHWMSEC sy-vline 
WA_DB2QLOTHW_STR-LOTHWCNT sy-vline 
WA_DB2QLOTHW_STR-LOTHWHW sy-vline 
WA_DB2QLOTHW_STR-LOTHWHP sy-vline 
WA_DB2QLOTHW_STR-LOTHWHB sy-vline 
WA_DB2QLOTHW_STR-LOTHWHN sy-vline 
WA_DB2QLOTHW_STR-LOTHWHR sy-vline 
WA_DB2QLOTHW_STR-LOTHWHC sy-vline 
WA_DB2QLOTHW_STR-LOTHWHJ sy-vline 
WA_DB2QLOTHW_STR-LOTHWHK sy-vline 
WA_DB2QLOTHW_STR-LOTHWACCT sy-vline 
WA_DB2QLOTHW_STR-LOTHWHLUUV sy-vline 
WA_DB2QLOTHW_STR-LOTHWHT sy-vline 
WA_DB2QLOTHW_STR-LOTHWHI sy-vline 
WA_DB2QLOTHW_STR-LOTHWHS sy-vline 
WA_DB2QLOTHW_STR-LOTHWHD sy-vline 
WA_DB2QLOTHW_STR-LOTHWHF sy-vline 
WA_DB2QLOTHW_STR-LOTHWSTID sy-vline 
WA_DB2QLOTHW_STR-RZ20 sy-vline 
WA_DB2QLOTHW_STR-E2E sy-vline      INTO ld_text SEPARATED BY SPACE.

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