ABAP Select data from SAP table Q0148 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP Q0148 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 Q0148. 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 Q0148 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_Q0148 TYPE STANDARD TABLE OF Q0148,
      WA_Q0148 TYPE Q0148,
      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: <Q0148> TYPE Q0148.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_Q0148.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM Q0148
  INTO TABLE IT_Q0148.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM Q0148
*  INTO TABLE @DATA(IT_Q01482).
*--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_Q0148 INDEX 1 INTO DATA(WA_Q01482).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_Q0148 ASSIGNING <Q0148>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<Q0148>-FASEX = 1.
<Q0148>-LNDTX = 1.
<Q0148>-NATTX = 1.
<Q0148>-DP1TX = 1.
<Q0148>-DP2TX = 1.

ENDLOOP.

LOOP AT IT_Q0148 INTO WA_Q0148.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_Q0148-DP3TX, sy-vline,
  WA_Q0148-DP4TX, sy-vline,
  WA_Q0148-DPHTX, sy-vline,
  WA_Q0148-DPFTX, sy-vline,
  WA_Q0148-GESC1, sy-vline,
  WA_Q0148-GESC2, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_Q0148 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_Q0148 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_Q0148 INTO WA_Q0148.


*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_Q0148_STR, 
FASEX TYPE STRING,
LNDTX TYPE STRING,
NATTX TYPE STRING,
DP1TX TYPE STRING,
DP2TX TYPE STRING,
DP3TX TYPE STRING,
DP4TX TYPE STRING,
DPHTX TYPE STRING,
DPFTX TYPE STRING,
GESC1 TYPE STRING,
GESC2 TYPE STRING,
DP5TX TYPE STRING,
YEAAD TYPE STRING,
YEANM TYPE STRING,END OF T_EKKO_STR.
DATA: WA_Q0148_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_Q0148_STR-FASEX sy-vline 
WA_Q0148_STR-LNDTX sy-vline 
WA_Q0148_STR-NATTX sy-vline 
WA_Q0148_STR-DP1TX sy-vline 
WA_Q0148_STR-DP2TX sy-vline 
WA_Q0148_STR-DP3TX sy-vline 
WA_Q0148_STR-DP4TX sy-vline 
WA_Q0148_STR-DPHTX sy-vline 
WA_Q0148_STR-DPFTX sy-vline 
WA_Q0148_STR-GESC1 sy-vline 
WA_Q0148_STR-GESC2 sy-vline 
WA_Q0148_STR-DP5TX sy-vline 
WA_Q0148_STR-YEAAD sy-vline 
WA_Q0148_STR-YEANM sy-vline      INTO ld_text SEPARATED BY SPACE.

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