ABAP Select data from SAP table P01W_DBZK into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP P01W_DBZK 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 P01W_DBZK. 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 P01W_DBZK 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_P01W_DBZK TYPE STANDARD TABLE OF P01W_DBZK,
      WA_P01W_DBZK TYPE P01W_DBZK,
      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: <P01W_DBZK> TYPE P01W_DBZK.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_P01W_DBZK.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM P01W_DBZK
  INTO TABLE IT_P01W_DBZK.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM P01W_DBZK
*  INTO TABLE @DATA(IT_P01W_DBZK2).
*--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_P01W_DBZK INDEX 1 INTO DATA(WA_P01W_DBZK2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_P01W_DBZK ASSIGNING <P01W_DBZK>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<P01W_DBZK>-MANDT = 1.
<P01W_DBZK>-PERNR = 1.
<P01W_DBZK>-MSGID = 1.
<P01W_DBZK>-DATUM = 1.
<P01W_DBZK>-MNR = 1.

ENDLOOP.

LOOP AT IT_P01W_DBZK INTO WA_P01W_DBZK.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_P01W_DBZK-KENNG, sy-vline,
  WA_P01W_DBZK-ANSTD, sy-vline,
  WA_P01W_DBZK-WOSTD, sy-vline,
  WA_P01W_DBZK-MBEG1, sy-vline,
  WA_P01W_DBZK-MEND1, sy-vline,
  WA_P01W_DBZK-MSTD1, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_P01W_DBZK 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_P01W_DBZK 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_P01W_DBZK INTO WA_P01W_DBZK.


*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_P01W_DBZK_STR, 
MANDT TYPE STRING,
PERNR TYPE STRING,
MSGID TYPE STRING,
DATUM TYPE STRING,
MNR TYPE STRING,
KENNG TYPE STRING,
ANSTD TYPE STRING,
WOSTD TYPE STRING,
MBEG1 TYPE STRING,
MEND1 TYPE STRING,
MSTD1 TYPE STRING,
MBEG2 TYPE STRING,
MEND2 TYPE STRING,
MSTD2 TYPE STRING,
MBEG3 TYPE STRING,
MEND3 TYPE STRING,
MSTD3 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_P01W_DBZK_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_P01W_DBZK_STR-MANDT sy-vline 
WA_P01W_DBZK_STR-PERNR sy-vline 
WA_P01W_DBZK_STR-MSGID sy-vline 
WA_P01W_DBZK_STR-DATUM sy-vline 
WA_P01W_DBZK_STR-MNR sy-vline 
WA_P01W_DBZK_STR-KENNG sy-vline 
WA_P01W_DBZK_STR-ANSTD sy-vline 
WA_P01W_DBZK_STR-WOSTD sy-vline 
WA_P01W_DBZK_STR-MBEG1 sy-vline 
WA_P01W_DBZK_STR-MEND1 sy-vline 
WA_P01W_DBZK_STR-MSTD1 sy-vline 
WA_P01W_DBZK_STR-MBEG2 sy-vline 
WA_P01W_DBZK_STR-MEND2 sy-vline 
WA_P01W_DBZK_STR-MSTD2 sy-vline 
WA_P01W_DBZK_STR-MBEG3 sy-vline 
WA_P01W_DBZK_STR-MEND3 sy-vline 
WA_P01W_DBZK_STR-MSTD3 sy-vline      INTO ld_text SEPARATED BY SPACE.

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