ABAP Select data from SAP table DB2QWHSC into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP DB2QWHSC 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 DB2QWHSC. 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 DB2QWHSC 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_DB2QWHSC TYPE STANDARD TABLE OF DB2QWHSC,
      WA_DB2QWHSC TYPE DB2QWHSC,
      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: <DB2QWHSC> TYPE DB2QWHSC.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_DB2QWHSC.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM DB2QWHSC
  INTO TABLE IT_DB2QWHSC.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DB2QWHSC
*  INTO TABLE @DATA(IT_DB2QWHSC2).
*--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_DB2QWHSC INDEX 1 INTO DATA(WA_DB2QWHSC2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_DB2QWHSC ASSIGNING <DB2QWHSC>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DB2QWHSC>-QWHSLEN = 1.
<DB2QWHSC>-QWHSTYP = 1.
<DB2QWHSC>-QWHSRMID = 1.
<DB2QWHSC>-QWHSIID = 1.
<DB2QWHSC>-QWHSNSDA = 1.

ENDLOOP.

LOOP AT IT_DB2QWHSC INTO WA_DB2QWHSC.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DB2QWHSC-QWHSRN, sy-vline,
  WA_DB2QWHSC-QWHSACE, sy-vline,
  WA_DB2QWHSC-QWHSSSID, sy-vline,
  WA_DB2QWHSC-QWHSSC1, sy-vline,
  WA_DB2QWHSC-QWHSSC2, sy-vline,
  WA_DB2QWHSC-QWHSISEQ, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DB2QWHSC 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_DB2QWHSC 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_DB2QWHSC INTO WA_DB2QWHSC.


*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_DB2QWHSC_STR, 
QWHSLEN TYPE STRING,
QWHSTYP TYPE STRING,
QWHSRMID TYPE STRING,
QWHSIID TYPE STRING,
QWHSNSDA TYPE STRING,
QWHSRN TYPE STRING,
QWHSACE TYPE STRING,
QWHSSSID TYPE STRING,
QWHSSC1 TYPE STRING,
QWHSSC2 TYPE STRING,
QWHSISEQ TYPE STRING,
QWHSWSEQ TYPE STRING,
QWHSMTN TYPE STRING,
QWHSLOCN TYPE STRING,
QWHSNID TYPE STRING,
QWHSLUNM TYPE STRING,
QWHSLUUV TYPE STRING,
QWHSLUCC TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DB2QWHSC_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_DB2QWHSC_STR-QWHSLEN sy-vline 
WA_DB2QWHSC_STR-QWHSTYP sy-vline 
WA_DB2QWHSC_STR-QWHSRMID sy-vline 
WA_DB2QWHSC_STR-QWHSIID sy-vline 
WA_DB2QWHSC_STR-QWHSNSDA sy-vline 
WA_DB2QWHSC_STR-QWHSRN sy-vline 
WA_DB2QWHSC_STR-QWHSACE sy-vline 
WA_DB2QWHSC_STR-QWHSSSID sy-vline 
WA_DB2QWHSC_STR-QWHSSC1 sy-vline 
WA_DB2QWHSC_STR-QWHSSC2 sy-vline 
WA_DB2QWHSC_STR-QWHSISEQ sy-vline 
WA_DB2QWHSC_STR-QWHSWSEQ sy-vline 
WA_DB2QWHSC_STR-QWHSMTN sy-vline 
WA_DB2QWHSC_STR-QWHSLOCN sy-vline 
WA_DB2QWHSC_STR-QWHSNID sy-vline 
WA_DB2QWHSC_STR-QWHSLUNM sy-vline 
WA_DB2QWHSC_STR-QWHSLUUV sy-vline 
WA_DB2QWHSC_STR-QWHSLUCC sy-vline      INTO ld_text SEPARATED BY SPACE.

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