ABAP Select data from SAP table DB2QLODRS into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP DB2QLODRS 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 DB2QLODRS. 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 DB2QLODRS 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_DB2QLODRS TYPE STANDARD TABLE OF DB2QLODRS,
      WA_DB2QLODRS TYPE DB2QLODRS,
      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: <DB2QLODRS> TYPE DB2QLODRS.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_DB2QLODRS.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM DB2QLODRS
  INTO TABLE IT_DB2QLODRS.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DB2QLODRS
*  INTO TABLE @DATA(IT_DB2QLODRS2).
*--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_DB2QLODRS INDEX 1 INTO DATA(WA_DB2QLODRS2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_DB2QLODRS ASSIGNING <DB2QLODRS>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DB2QLODRS>-LODRSSSID = 1.
<DB2QLODRS>-LODRSLUUV = 1.
<DB2QLODRS>-LODRSDATE = 1.
<DB2QLODRS>-LODRSTIME = 1.
<DB2QLODRS>-LODRSMSEC = 1.

ENDLOOP.

LOOP AT IT_DB2QLODRS INTO WA_DB2QLODRS.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DB2QLODRS-LODRSCNT, sy-vline,
  WA_DB2QLODRS-LODRSFR, sy-vline,
  WA_DB2QLODRS-LODRSKD, sy-vline,
  WA_DB2QLODRS-LODRSKP, sy-vline,
  WA_DB2QLODRS-LODRSK0, sy-vline,
  WA_DB2QLODRS-LODRSK1, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DB2QLODRS 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_DB2QLODRS 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_DB2QLODRS INTO WA_DB2QLODRS.


*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_DB2QLODRS_STR, 
LODRSSSID TYPE STRING,
LODRSLUUV TYPE STRING,
LODRSDATE TYPE STRING,
LODRSTIME TYPE STRING,
LODRSMSEC TYPE STRING,
LODRSCNT TYPE STRING,
LODRSFR TYPE STRING,
LODRSKD TYPE STRING,
LODRSKP TYPE STRING,
LODRSK0 TYPE STRING,
LODRSK1 TYPE STRING,
LODRSK2 TYPE STRING,
LODRSHP TYPE STRING,
LODRSHB TYPE STRING,
LODRSHN TYPE STRING,
LODRSHR TYPE STRING,
LODRSHC TYPE STRING,
LODRSHJ TYPE STRING,
LODRSHK TYPE STRING,
LODRSHACCT TYPE STRING,
LODRSHLUUV TYPE STRING,
LODRSHT TYPE STRING,
LODRSHI TYPE STRING,
LODRSHS TYPE STRING,
LODRSHD TYPE STRING,
LODRSHF TYPE STRING,
LODRSWP TYPE STRING,
LODRSWB TYPE STRING,
LODRSWN TYPE STRING,
LODRSWR TYPE STRING,
LODRSWC TYPE STRING,
LODRSWJ TYPE STRING,
LODRSWK TYPE STRING,
LODRSWACCT TYPE STRING,
LODRSWLUUV TYPE STRING,
LODRSWT TYPE STRING,
LODRSWI TYPE STRING,
LODRSWF TYPE STRING,
LODRSWS TYPE STRING,
LODRSWD TYPE STRING,
LODRSWG TYPE STRING,
LODRSWA TYPE STRING,
LODRSHSTID TYPE STRING,
LODRSWSTID TYPE STRING,
RZ20 TYPE STRING,
E2E TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DB2QLODRS_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_DB2QLODRS_STR-LODRSSSID sy-vline 
WA_DB2QLODRS_STR-LODRSLUUV sy-vline 
WA_DB2QLODRS_STR-LODRSDATE sy-vline 
WA_DB2QLODRS_STR-LODRSTIME sy-vline 
WA_DB2QLODRS_STR-LODRSMSEC sy-vline 
WA_DB2QLODRS_STR-LODRSCNT sy-vline 
WA_DB2QLODRS_STR-LODRSFR sy-vline 
WA_DB2QLODRS_STR-LODRSKD sy-vline 
WA_DB2QLODRS_STR-LODRSKP sy-vline 
WA_DB2QLODRS_STR-LODRSK0 sy-vline 
WA_DB2QLODRS_STR-LODRSK1 sy-vline 
WA_DB2QLODRS_STR-LODRSK2 sy-vline 
WA_DB2QLODRS_STR-LODRSHP sy-vline 
WA_DB2QLODRS_STR-LODRSHB sy-vline 
WA_DB2QLODRS_STR-LODRSHN sy-vline 
WA_DB2QLODRS_STR-LODRSHR sy-vline 
WA_DB2QLODRS_STR-LODRSHC sy-vline 
WA_DB2QLODRS_STR-LODRSHJ sy-vline 
WA_DB2QLODRS_STR-LODRSHK sy-vline 
WA_DB2QLODRS_STR-LODRSHACCT sy-vline 
WA_DB2QLODRS_STR-LODRSHLUUV sy-vline 
WA_DB2QLODRS_STR-LODRSHT sy-vline 
WA_DB2QLODRS_STR-LODRSHI sy-vline 
WA_DB2QLODRS_STR-LODRSHS sy-vline 
WA_DB2QLODRS_STR-LODRSHD sy-vline 
WA_DB2QLODRS_STR-LODRSHF sy-vline 
WA_DB2QLODRS_STR-LODRSWP sy-vline 
WA_DB2QLODRS_STR-LODRSWB sy-vline 
WA_DB2QLODRS_STR-LODRSWN sy-vline 
WA_DB2QLODRS_STR-LODRSWR sy-vline 
WA_DB2QLODRS_STR-LODRSWC sy-vline 
WA_DB2QLODRS_STR-LODRSWJ sy-vline 
WA_DB2QLODRS_STR-LODRSWK sy-vline 
WA_DB2QLODRS_STR-LODRSWACCT sy-vline 
WA_DB2QLODRS_STR-LODRSWLUUV sy-vline 
WA_DB2QLODRS_STR-LODRSWT sy-vline 
WA_DB2QLODRS_STR-LODRSWI sy-vline 
WA_DB2QLODRS_STR-LODRSWF sy-vline 
WA_DB2QLODRS_STR-LODRSWS sy-vline 
WA_DB2QLODRS_STR-LODRSWD sy-vline 
WA_DB2QLODRS_STR-LODRSWG sy-vline 
WA_DB2QLODRS_STR-LODRSWA sy-vline 
WA_DB2QLODRS_STR-LODRSHSTID sy-vline 
WA_DB2QLODRS_STR-LODRSWSTID sy-vline 
WA_DB2QLODRS_STR-RZ20 sy-vline 
WA_DB2QLODRS_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.