ABAP Select data from SAP table Q0188 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP Q0188 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 Q0188. 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 Q0188 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_Q0188 TYPE STANDARD TABLE OF Q0188,
      WA_Q0188 TYPE Q0188,
      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: <Q0188> TYPE Q0188.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_Q0188.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM Q0188
  INTO TABLE IT_Q0188.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM Q0188
*  INTO TABLE @DATA(IT_Q01882).
*--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_Q0188 INDEX 1 INTO DATA(WA_Q01882).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_Q0188 ASSIGNING <Q0188>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<Q0188>-TAXFN = 1.
<Q0188>-TAXFI = 1.
<Q0188>-TFNDT = 1.
<Q0188>-TFNAT = 1.
<Q0188>-ALW01 = 1.

ENDLOOP.

LOOP AT IT_Q0188 INTO WA_Q0188.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_Q0188-AMT01, sy-vline,
  WA_Q0188-TOTAL, sy-vline,
  WA_Q0188-BETLA, sy-vline,
  WA_Q0188-BETLB, sy-vline,
  WA_Q0188-BETLC, sy-vline,
  WA_Q0188-BETLD, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_Q0188 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_Q0188 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_Q0188 INTO WA_Q0188.


*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_Q0188_STR, 
TAXFN TYPE STRING,
TAXFI TYPE STRING,
TFNDT TYPE STRING,
TFNAT TYPE STRING,
ALW01 TYPE STRING,
AMT01 TYPE STRING,
TOTAL TYPE STRING,
BETLA TYPE STRING,
BETLB TYPE STRING,
BETLC TYPE STRING,
BETLD TYPE STRING,
LGTUN TYPE STRING,
BETUN TYPE STRING,
BETGR TYPE STRING,
BETTX TYPE STRING,
BEGDT TYPE STRING,
ENDDT TYPE STRING,
BETLE TYPE STRING,
BEFBT TYPE STRING,
BCDEP TYPE STRING,
BOTIN TYPE STRING,
PSHDR TYPE STRING,
ETPHD TYPE STRING,END OF T_EKKO_STR.
DATA: WA_Q0188_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_Q0188_STR-TAXFN sy-vline 
WA_Q0188_STR-TAXFI sy-vline 
WA_Q0188_STR-TFNDT sy-vline 
WA_Q0188_STR-TFNAT sy-vline 
WA_Q0188_STR-ALW01 sy-vline 
WA_Q0188_STR-AMT01 sy-vline 
WA_Q0188_STR-TOTAL sy-vline 
WA_Q0188_STR-BETLA sy-vline 
WA_Q0188_STR-BETLB sy-vline 
WA_Q0188_STR-BETLC sy-vline 
WA_Q0188_STR-BETLD sy-vline 
WA_Q0188_STR-LGTUN sy-vline 
WA_Q0188_STR-BETUN sy-vline 
WA_Q0188_STR-BETGR sy-vline 
WA_Q0188_STR-BETTX sy-vline 
WA_Q0188_STR-BEGDT sy-vline 
WA_Q0188_STR-ENDDT sy-vline 
WA_Q0188_STR-BETLE sy-vline 
WA_Q0188_STR-BEFBT sy-vline 
WA_Q0188_STR-BCDEP sy-vline 
WA_Q0188_STR-BOTIN sy-vline 
WA_Q0188_STR-PSHDR sy-vline 
WA_Q0188_STR-ETPHD sy-vline      INTO ld_text SEPARATED BY SPACE.

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