ABAP Select data from SAP table Q0812 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP Q0812 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 Q0812. 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 Q0812 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_Q0812 TYPE STANDARD TABLE OF Q0812,
      WA_Q0812 TYPE Q0812,
      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: <Q0812> TYPE Q0812.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_Q0812.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM Q0812
  INTO TABLE IT_Q0812.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM Q0812
*  INTO TABLE @DATA(IT_Q08122).
*--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_Q0812 INDEX 1 INTO DATA(WA_Q08122).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_Q0812 ASSIGNING <Q0812>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<Q0812>-EMNAM = 1.
<Q0812>-SUBTY = 1.
<Q0812>-SUBTX = 1.
<Q0812>-OBJPS = 1.
<Q0812>-REGNO = 1.

ENDLOOP.

LOOP AT IT_Q0812 INTO WA_Q0812.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_Q0812-SUPNR, sy-vline,
  WA_Q0812-SUPNM, sy-vline,
  WA_Q0812-MECNT, sy-vline,
  WA_Q0812-MEAMT, sy-vline,
  WA_Q0812-MECUR, sy-vline,
  WA_Q0812-MECDT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_Q0812 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_Q0812 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_Q0812 INTO WA_Q0812.


*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.

*Conversion exit REGNO, internal->external for field REGNO
CALL FUNCTION 'CONVERSION_EXIT_REGNO_OUTPUT'
  EXPORTING
    input =                      WA_Q0812-REGNO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_Q0812-REGNO.
WRITE:/ 'New Value:', ld_input.

*Conversion exit BZNUM, internal->external for field SUPNR
CALL FUNCTION 'CONVERSION_EXIT_BZNUM_OUTPUT'
  EXPORTING
    input =                      WA_Q0812-SUPNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_Q0812-SUPNR.
WRITE:/ 'New Value:', ld_input.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_Q0812_STR, 
EMNAM TYPE STRING,
SUBTY TYPE STRING,
SUBTX TYPE STRING,
OBJPS TYPE STRING,
REGNO TYPE STRING,
SUPNR TYPE STRING,
SUPNM TYPE STRING,
MECNT TYPE STRING,
MEAMT TYPE STRING,
MECUR TYPE STRING,
MECDT TYPE STRING,
MECDA TYPE STRING,
MEPCD TYPE STRING,
MESTY TYPE STRING,
SURPG TYPE STRING,
MEOTH TYPE STRING,
MEDTY TYPE STRING,END OF T_EKKO_STR.
DATA: WA_Q0812_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_Q0812_STR-EMNAM sy-vline 
WA_Q0812_STR-SUBTY sy-vline 
WA_Q0812_STR-SUBTX sy-vline 
WA_Q0812_STR-OBJPS sy-vline 
WA_Q0812_STR-REGNO sy-vline 
WA_Q0812_STR-SUPNR sy-vline 
WA_Q0812_STR-SUPNM sy-vline 
WA_Q0812_STR-MECNT sy-vline 
WA_Q0812_STR-MEAMT sy-vline 
WA_Q0812_STR-MECUR sy-vline 
WA_Q0812_STR-MECDT sy-vline 
WA_Q0812_STR-MECDA sy-vline 
WA_Q0812_STR-MEPCD sy-vline 
WA_Q0812_STR-MESTY sy-vline 
WA_Q0812_STR-SURPG sy-vline 
WA_Q0812_STR-MEOTH sy-vline 
WA_Q0812_STR-MEDTY sy-vline      INTO ld_text SEPARATED BY SPACE.

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