ABAP Select data from SAP table P06_PRER into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP P06_PRER 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 P06_PRER. 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 P06_PRER 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_P06_PRER TYPE STANDARD TABLE OF P06_PRER,
      WA_P06_PRER TYPE P06_PRER,
      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: <P06_PRER> TYPE P06_PRER.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_P06_PRER.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM P06_PRER
  INTO TABLE IT_P06_PRER.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM P06_PRER
*  INTO TABLE @DATA(IT_P06_PRER2).
*--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_P06_PRER INDEX 1 INTO DATA(WA_P06_PRER2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_P06_PRER ASSIGNING <P06_PRER>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<P06_PRER>-REFER = 1.
<P06_PRER>-SKEY = 1.
<P06_PRER>-PCOPR = 1.
<P06_PRER>-PCPOP = 1.
<P06_PRER>-PRSBR = 1.

ENDLOOP.

LOOP AT IT_P06_PRER INTO WA_P06_PRER.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_P06_PRER-PRSBP, sy-vline,
  WA_P06_PRER-PRTRA, sy-vline,
  WA_P06_PRER-PRTR2, sy-vline,
  WA_P06_PRER-PRTRB, sy-vline,
  WA_P06_PRER-PRTRC, sy-vline,
  WA_P06_PRER-PRTRD, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_P06_PRER 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_P06_PRER 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_P06_PRER INTO WA_P06_PRER.


*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_P06_PRER_STR, 
REFER TYPE STRING,
SKEY TYPE STRING,
PCOPR TYPE STRING,
PCPOP TYPE STRING,
PRSBR TYPE STRING,
PRSBP TYPE STRING,
PRTRA TYPE STRING,
PRTR2 TYPE STRING,
PRTRB TYPE STRING,
PRTRC TYPE STRING,
PRTRD TYPE STRING,
PRTD1 TYPE STRING,
PRMTC TYPE STRING,END OF T_EKKO_STR.
DATA: WA_P06_PRER_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_P06_PRER_STR-REFER sy-vline 
WA_P06_PRER_STR-SKEY sy-vline 
WA_P06_PRER_STR-PCOPR sy-vline 
WA_P06_PRER_STR-PCPOP sy-vline 
WA_P06_PRER_STR-PRSBR sy-vline 
WA_P06_PRER_STR-PRSBP sy-vline 
WA_P06_PRER_STR-PRTRA sy-vline 
WA_P06_PRER_STR-PRTR2 sy-vline 
WA_P06_PRER_STR-PRTRB sy-vline 
WA_P06_PRER_STR-PRTRC sy-vline 
WA_P06_PRER_STR-PRTRD sy-vline 
WA_P06_PRER_STR-PRTD1 sy-vline 
WA_P06_PRER_STR-PRMTC sy-vline      INTO ld_text SEPARATED BY SPACE.

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