ABAP Select data from SAP table DB2Q3ST into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP DB2Q3ST 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 DB2Q3ST. 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 DB2Q3ST 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_DB2Q3ST TYPE STANDARD TABLE OF DB2Q3ST,
      WA_DB2Q3ST TYPE DB2Q3ST,
      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: <DB2Q3ST> TYPE DB2Q3ST.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_DB2Q3ST.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM DB2Q3ST
  INTO TABLE IT_DB2Q3ST.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DB2Q3ST
*  INTO TABLE @DATA(IT_DB2Q3ST2).
*--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_DB2Q3ST INDEX 1 INTO DATA(WA_DB2Q3ST2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_DB2Q3ST ASSIGNING <DB2Q3ST>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DB2Q3ST>-Q3STIDEN = 1.
<DB2Q3ST>-Q3STSIGN = 1.
<DB2Q3ST>-Q3STCTHD = 1.
<DB2Q3ST>-Q3STTERM = 1.
<DB2Q3ST>-Q3STRIUR = 1.

ENDLOOP.

LOOP AT IT_DB2Q3ST INTO WA_DB2Q3ST.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DB2Q3ST-Q3STPREP, sy-vline,
  WA_DB2Q3ST-Q3STCOMM, sy-vline,
  WA_DB2Q3ST-Q3STABRT, sy-vline,
  WA_DB2Q3ST-Q3STSYNC, sy-vline,
  WA_DB2Q3ST-Q3STEXIT, sy-vline,
  WA_DB2Q3ST-Q3STINDT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DB2Q3ST 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_DB2Q3ST 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_DB2Q3ST INTO WA_DB2Q3ST.


*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_DB2Q3ST_STR, 
Q3STIDEN TYPE STRING,
Q3STSIGN TYPE STRING,
Q3STCTHD TYPE STRING,
Q3STTERM TYPE STRING,
Q3STRIUR TYPE STRING,
Q3STPREP TYPE STRING,
Q3STCOMM TYPE STRING,
Q3STABRT TYPE STRING,
Q3STSYNC TYPE STRING,
Q3STEXIT TYPE STRING,
Q3STINDT TYPE STRING,
Q3STMEOT TYPE STRING,
Q3STMEOM TYPE STRING,
Q3STSSSI TYPE STRING,
Q3STCTHW TYPE STRING,
Q3STRDON TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DB2Q3ST_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_DB2Q3ST_STR-Q3STIDEN sy-vline 
WA_DB2Q3ST_STR-Q3STSIGN sy-vline 
WA_DB2Q3ST_STR-Q3STCTHD sy-vline 
WA_DB2Q3ST_STR-Q3STTERM sy-vline 
WA_DB2Q3ST_STR-Q3STRIUR sy-vline 
WA_DB2Q3ST_STR-Q3STPREP sy-vline 
WA_DB2Q3ST_STR-Q3STCOMM sy-vline 
WA_DB2Q3ST_STR-Q3STABRT sy-vline 
WA_DB2Q3ST_STR-Q3STSYNC sy-vline 
WA_DB2Q3ST_STR-Q3STEXIT sy-vline 
WA_DB2Q3ST_STR-Q3STINDT sy-vline 
WA_DB2Q3ST_STR-Q3STMEOT sy-vline 
WA_DB2Q3ST_STR-Q3STMEOM sy-vline 
WA_DB2Q3ST_STR-Q3STSSSI sy-vline 
WA_DB2Q3ST_STR-Q3STCTHW sy-vline 
WA_DB2Q3ST_STR-Q3STRDON sy-vline      INTO ld_text SEPARATED BY SPACE.

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