ABAP Select data from SAP table DB2QWP124 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP DB2QWP124 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 DB2QWP124. 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 DB2QWP124 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_DB2QWP124 TYPE STANDARD TABLE OF DB2QWP124,
      WA_DB2QWP124 TYPE DB2QWP124,
      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: <DB2QWP124> TYPE DB2QWP124.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_DB2QWP124.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM DB2QWP124
  INTO TABLE IT_DB2QWP124.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DB2QWP124
*  INTO TABLE @DATA(IT_DB2QWP1242).
*--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_DB2QWP124 INDEX 1 INTO DATA(WA_DB2QWP1242).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_DB2QWP124 ASSIGNING <DB2QWP124>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DB2QWP124>-QWP4REGO = 1.
<DB2QWP124>-QWP4EDBC = 1.
<DB2QWP124>-QWP4ESTC = 1.
<DB2QWP124>-QWP4MXNC = 1.
<DB2QWP124>-QWP4MXSP = 1.

ENDLOOP.

LOOP AT IT_DB2QWP124 INTO WA_DB2QWP124.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DB2QWP124-QWP4LRTH, sy-vline,
  WA_DB2QWP124-QWP4PDIX, sy-vline,
  WA_DB2QWP124-QWP4ACCU, sy-vline,
  WA_DB2QWP124-QWP4MXOS, sy-vline,
  WA_DB2QWP124-QWP4MXOC, sy-vline,
  WA_DB2QWP124-QWP4MXOE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DB2QWP124 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_DB2QWP124 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_DB2QWP124 INTO WA_DB2QWP124.


*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_DB2QWP124_STR, 
QWP4REGO TYPE STRING,
QWP4EDBC TYPE STRING,
QWP4ESTC TYPE STRING,
QWP4MXNC TYPE STRING,
QWP4MXSP TYPE STRING,
QWP4LRTH TYPE STRING,
QWP4PDIX TYPE STRING,
QWP4ACCU TYPE STRING,
QWP4MXOS TYPE STRING,
QWP4MXOC TYPE STRING,
QWP4MXOE TYPE STRING,
QWP4SJXP TYPE STRING,
QWP4DCIX TYPE STRING,
QWP4DCFS TYPE STRING,
QWP1ACID TYPE STRING,
QWP1MESZ TYPE STRING,
QWP1TSQT TYPE STRING,
QWP1IXQT TYPE STRING,
QWP1VVCI TYPE STRING,
QWP1UNIC TYPE STRING,
QWP4PJSJ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DB2QWP124_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_DB2QWP124_STR-QWP4REGO sy-vline 
WA_DB2QWP124_STR-QWP4EDBC sy-vline 
WA_DB2QWP124_STR-QWP4ESTC sy-vline 
WA_DB2QWP124_STR-QWP4MXNC sy-vline 
WA_DB2QWP124_STR-QWP4MXSP sy-vline 
WA_DB2QWP124_STR-QWP4LRTH sy-vline 
WA_DB2QWP124_STR-QWP4PDIX sy-vline 
WA_DB2QWP124_STR-QWP4ACCU sy-vline 
WA_DB2QWP124_STR-QWP4MXOS sy-vline 
WA_DB2QWP124_STR-QWP4MXOC sy-vline 
WA_DB2QWP124_STR-QWP4MXOE sy-vline 
WA_DB2QWP124_STR-QWP4SJXP sy-vline 
WA_DB2QWP124_STR-QWP4DCIX sy-vline 
WA_DB2QWP124_STR-QWP4DCFS sy-vline 
WA_DB2QWP124_STR-QWP1ACID sy-vline 
WA_DB2QWP124_STR-QWP1MESZ sy-vline 
WA_DB2QWP124_STR-QWP1TSQT sy-vline 
WA_DB2QWP124_STR-QWP1IXQT sy-vline 
WA_DB2QWP124_STR-QWP1VVCI sy-vline 
WA_DB2QWP124_STR-QWP1UNIC sy-vline 
WA_DB2QWP124_STR-QWP4PJSJ sy-vline      INTO ld_text SEPARATED BY SPACE.

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