ABAP Select data from SAP table Q0310 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP Q0310 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 Q0310. 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 Q0310 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_Q0310 TYPE STANDARD TABLE OF Q0310,
      WA_Q0310 TYPE Q0310,
      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: <Q0310> TYPE Q0310.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_Q0310.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM Q0310
  INTO TABLE IT_Q0310.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM Q0310
*  INTO TABLE @DATA(IT_Q03102).
*--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_Q0310 INDEX 1 INTO DATA(WA_Q03102).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_Q0310 ASSIGNING <Q0310>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<Q0310>-FCODE = 1.
<Q0310>-MEMNO = 1.
<Q0310>-JOIND = 1.
<Q0310>-SUPSC = 1.
<Q0310>-SUPES = 1.

ENDLOOP.

LOOP AT IT_Q0310 INTO WA_Q0310.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_Q0310-EEPER, sy-vline,
  WA_Q0310-EEAMT, sy-vline,
  WA_Q0310-ERPCT, sy-vline,
  WA_Q0310-ERMUL, sy-vline,
  WA_Q0310-ERAMT, sy-vline,
  WA_Q0310-MEDCL, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_Q0310 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_Q0310 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_Q0310 INTO WA_Q0310.


*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_Q0310_STR, 
FCODE TYPE STRING,
MEMNO TYPE STRING,
JOIND TYPE STRING,
SUPSC TYPE STRING,
SUPES TYPE STRING,
EEPER TYPE STRING,
EEAMT TYPE STRING,
ERPCT TYPE STRING,
ERMUL TYPE STRING,
ERAMT TYPE STRING,
MEDCL TYPE STRING,
REASC TYPE STRING,END OF T_EKKO_STR.
DATA: WA_Q0310_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_Q0310_STR-FCODE sy-vline 
WA_Q0310_STR-MEMNO sy-vline 
WA_Q0310_STR-JOIND sy-vline 
WA_Q0310_STR-SUPSC sy-vline 
WA_Q0310_STR-SUPES sy-vline 
WA_Q0310_STR-EEPER sy-vline 
WA_Q0310_STR-EEAMT sy-vline 
WA_Q0310_STR-ERPCT sy-vline 
WA_Q0310_STR-ERMUL sy-vline 
WA_Q0310_STR-ERAMT sy-vline 
WA_Q0310_STR-MEDCL sy-vline 
WA_Q0310_STR-REASC sy-vline      INTO ld_text SEPARATED BY SPACE.

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