ABAP Select data from SAP table DLDQWP4 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP DLDQWP4 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 DLDQWP4. 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 DLDQWP4 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_DLDQWP4 TYPE STANDARD TABLE OF DLDQWP4,
      WA_DLDQWP4 TYPE DLDQWP4,
      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: <DLDQWP4> TYPE DLDQWP4.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_DLDQWP4.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM DLDQWP4
  INTO TABLE IT_DLDQWP4.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DLDQWP4
*  INTO TABLE @DATA(IT_DLDQWP42).
*--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_DLDQWP4 INDEX 1 INTO DATA(WA_DLDQWP42).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_DLDQWP4 ASSIGNING <DLDQWP4>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DLDQWP4>-QWP4CDYN = 1.
<DLDQWP4>-QWP4MXKD = 1.
<DLDQWP4>-QWP4EDPL = 1.
<DLDQWP4>-QWP4EDDS = 1.
<DLDQWP4>-QWP4RMAX = 1.

ENDLOOP.

LOOP AT IT_DLDQWP4 INTO WA_DLDQWP4.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DLDQWP4-QWP4SPOL, sy-vline,
  WA_DLDQWP4-QWP4TOUT, sy-vline,
  WA_DLDQWP4-QWP4LKTS, sy-vline,
  WA_DLDQWP4-QWP4LKUS, sy-vline,
  WA_DLDQWP4-QWP4RRU, sy-vline,
  WA_DLDQWP4-QWP4DSMX, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DLDQWP4 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_DLDQWP4 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_DLDQWP4 INTO WA_DLDQWP4.


*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_DLDQWP4_STR, 
QWP4CDYN TYPE STRING,
QWP4MXKD TYPE STRING,
QWP4EDPL TYPE STRING,
QWP4EDDS TYPE STRING,
QWP4RMAX TYPE STRING,
QWP4SPOL TYPE STRING,
QWP4TOUT TYPE STRING,
QWP4LKTS TYPE STRING,
QWP4LKUS TYPE STRING,
QWP4RRU TYPE STRING,
QWP4DSMX TYPE STRING,
QWP4SCAC TYPE STRING,
QWP4CONT TYPE STRING,
QWP4CTHR TYPE STRING,
QWP4STHR TYPE STRING,
QWP4TXS TYPE STRING,
QWP4TISP TYPE STRING,
QWP4OJEH TYPE STRING,
QWP4XLUC TYPE STRING,
QWP4NPAG TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DLDQWP4_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_DLDQWP4_STR-QWP4CDYN sy-vline 
WA_DLDQWP4_STR-QWP4MXKD sy-vline 
WA_DLDQWP4_STR-QWP4EDPL sy-vline 
WA_DLDQWP4_STR-QWP4EDDS sy-vline 
WA_DLDQWP4_STR-QWP4RMAX sy-vline 
WA_DLDQWP4_STR-QWP4SPOL sy-vline 
WA_DLDQWP4_STR-QWP4TOUT sy-vline 
WA_DLDQWP4_STR-QWP4LKTS sy-vline 
WA_DLDQWP4_STR-QWP4LKUS sy-vline 
WA_DLDQWP4_STR-QWP4RRU sy-vline 
WA_DLDQWP4_STR-QWP4DSMX sy-vline 
WA_DLDQWP4_STR-QWP4SCAC sy-vline 
WA_DLDQWP4_STR-QWP4CONT sy-vline 
WA_DLDQWP4_STR-QWP4CTHR sy-vline 
WA_DLDQWP4_STR-QWP4STHR sy-vline 
WA_DLDQWP4_STR-QWP4TXS sy-vline 
WA_DLDQWP4_STR-QWP4TISP sy-vline 
WA_DLDQWP4_STR-QWP4OJEH sy-vline 
WA_DLDQWP4_STR-QWP4XLUC sy-vline 
WA_DLDQWP4_STR-QWP4NPAG sy-vline      INTO ld_text SEPARATED BY SPACE.

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