ABAP Select data from SAP table P01W_DBMU into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP P01W_DBMU 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_DBMU. 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_DBMU 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_DBMU TYPE STANDARD TABLE OF P01W_DBMU,
      WA_P01W_DBMU TYPE P01W_DBMU,
      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_DBMU> TYPE P01W_DBMU.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_P01W_DBMU.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM P01W_DBMU
  INTO TABLE IT_P01W_DBMU.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM P01W_DBMU
*  INTO TABLE @DATA(IT_P01W_DBMU2).
*--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_DBMU INDEX 1 INTO DATA(WA_P01W_DBMU2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_P01W_DBMU ASSIGNING <P01W_DBMU>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<P01W_DBMU>-MANDT = 1.
<P01W_DBMU>-PERNR = 1.
<P01W_DBMU>-MSGID = 1.
<P01W_DBMU>-DATUM = 1.
<P01W_DBMU>-MNR = 1.

ENDLOOP.

LOOP AT IT_P01W_DBMU INTO WA_P01W_DBMU.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_P01W_DBMU-KENNG, sy-vline,
  WA_P01W_DBMU-KNZST, sy-vline,
  WA_P01W_DBMU-WAERS, sy-vline,
  WA_P01W_DBMU-MUBEG, sy-vline,
  WA_P01W_DBMU-ENTRY, sy-vline,
  WA_P01W_DBMU-FRABL, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_P01W_DBMU 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_DBMU 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_DBMU INTO WA_P01W_DBMU.


*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_DBMU_STR, 
MANDT TYPE STRING,
PERNR TYPE STRING,
MSGID TYPE STRING,
DATUM TYPE STRING,
MNR TYPE STRING,
KENNG TYPE STRING,
KNZST TYPE STRING,
WAERS TYPE STRING,
MUBEG TYPE STRING,
ENTRY TYPE STRING,
FRABL TYPE STRING,
FADFL TYPE STRING,
FADAT TYPE STRING,
KDGAM TYPE STRING,
KGVON TYPE STRING,
KDZUM TYPE STRING,
KDGRD TYPE STRING,
LADAY TYPE STRING,
AEZUS TYPE STRING,
AEBIS TYPE STRING,
ZANTO TYPE STRING,
ZLRHT TYPE STRING,
VWBET TYPE STRING,
VWRHT TYPE STRING,
ZSBTG TYPE STRING,
WKWDY TYPE STRING,
WOSTD TYPE STRING,
FZVSB TYPE STRING,
GT750 TYPE STRING,
WBEG1 TYPE STRING,
WEND1 TYPE STRING,
WANZ1 TYPE STRING,
WMEA1 TYPE STRING,
ENTS1 TYPE STRING,
UNTS1 TYPE STRING,
WNET1 TYPE STRING,
WBEG2 TYPE STRING,
WEND2 TYPE STRING,
WANZ2 TYPE STRING,
WMEA2 TYPE STRING,
ENTS2 TYPE STRING,
UNTS2 TYPE STRING,
WNET2 TYPE STRING,
WBEG3 TYPE STRING,
WEND3 TYPE STRING,
WANZ3 TYPE STRING,
WMEA3 TYPE STRING,
ENTS3 TYPE STRING,
UNTS3 TYPE STRING,
WNET3 TYPE STRING,
ZUSAR TYPE STRING,
ABART TYPE STRING,
KDGVO TYPE STRING,
KGGRD TYPE STRING,
ZABRT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_P01W_DBMU_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_DBMU_STR-MANDT sy-vline 
WA_P01W_DBMU_STR-PERNR sy-vline 
WA_P01W_DBMU_STR-MSGID sy-vline 
WA_P01W_DBMU_STR-DATUM sy-vline 
WA_P01W_DBMU_STR-MNR sy-vline 
WA_P01W_DBMU_STR-KENNG sy-vline 
WA_P01W_DBMU_STR-KNZST sy-vline 
WA_P01W_DBMU_STR-WAERS sy-vline 
WA_P01W_DBMU_STR-MUBEG sy-vline 
WA_P01W_DBMU_STR-ENTRY sy-vline 
WA_P01W_DBMU_STR-FRABL sy-vline 
WA_P01W_DBMU_STR-FADFL sy-vline 
WA_P01W_DBMU_STR-FADAT sy-vline 
WA_P01W_DBMU_STR-KDGAM sy-vline 
WA_P01W_DBMU_STR-KGVON sy-vline 
WA_P01W_DBMU_STR-KDZUM sy-vline 
WA_P01W_DBMU_STR-KDGRD sy-vline 
WA_P01W_DBMU_STR-LADAY sy-vline 
WA_P01W_DBMU_STR-AEZUS sy-vline 
WA_P01W_DBMU_STR-AEBIS sy-vline 
WA_P01W_DBMU_STR-ZANTO sy-vline 
WA_P01W_DBMU_STR-ZLRHT sy-vline 
WA_P01W_DBMU_STR-VWBET sy-vline 
WA_P01W_DBMU_STR-VWRHT sy-vline 
WA_P01W_DBMU_STR-ZSBTG sy-vline 
WA_P01W_DBMU_STR-WKWDY sy-vline 
WA_P01W_DBMU_STR-WOSTD sy-vline 
WA_P01W_DBMU_STR-FZVSB sy-vline 
WA_P01W_DBMU_STR-GT750 sy-vline 
WA_P01W_DBMU_STR-WBEG1 sy-vline 
WA_P01W_DBMU_STR-WEND1 sy-vline 
WA_P01W_DBMU_STR-WANZ1 sy-vline 
WA_P01W_DBMU_STR-WMEA1 sy-vline 
WA_P01W_DBMU_STR-ENTS1 sy-vline 
WA_P01W_DBMU_STR-UNTS1 sy-vline 
WA_P01W_DBMU_STR-WNET1 sy-vline 
WA_P01W_DBMU_STR-WBEG2 sy-vline 
WA_P01W_DBMU_STR-WEND2 sy-vline 
WA_P01W_DBMU_STR-WANZ2 sy-vline 
WA_P01W_DBMU_STR-WMEA2 sy-vline 
WA_P01W_DBMU_STR-ENTS2 sy-vline 
WA_P01W_DBMU_STR-UNTS2 sy-vline 
WA_P01W_DBMU_STR-WNET2 sy-vline 
WA_P01W_DBMU_STR-WBEG3 sy-vline 
WA_P01W_DBMU_STR-WEND3 sy-vline 
WA_P01W_DBMU_STR-WANZ3 sy-vline 
WA_P01W_DBMU_STR-WMEA3 sy-vline 
WA_P01W_DBMU_STR-ENTS3 sy-vline 
WA_P01W_DBMU_STR-UNTS3 sy-vline 
WA_P01W_DBMU_STR-WNET3 sy-vline 
WA_P01W_DBMU_STR-ZUSAR sy-vline 
WA_P01W_DBMU_STR-ABART sy-vline 
WA_P01W_DBMU_STR-KDGVO sy-vline 
WA_P01W_DBMU_STR-KGGRD sy-vline 
WA_P01W_DBMU_STR-ZABRT sy-vline      INTO ld_text SEPARATED BY SPACE.

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