ABAP Select data from SAP table PSBWMLSDAT into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PSBWMLSDAT
*  INTO TABLE @DATA(IT_PSBWMLSDAT2).
*--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_PSBWMLSDAT INDEX 1 INTO DATA(WA_PSBWMLSDAT2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PSBWMLSDAT>-MLST_ZAEHL = 1.
<PSBWMLSDAT>-AUFNR = 1.
<PSBWMLSDAT>-VORNR = 1.
<PSBWMLSDAT>-PSPID = 1.
<PSBWMLSDAT>-POSID = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PSBWMLSDAT-DATEV, sy-vline,
  WA_PSBWMLSDAT-DATEH, sy-vline,
  WA_PSBWMLSDAT-CALDAY, sy-vline,
  WA_PSBWMLSDAT-VSDATE, sy-vline,
  WA_PSBWMLSDAT-VALUETYPE, sy-vline,
  WA_PSBWMLSDAT-EVENT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PSBWMLSDAT 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_PSBWMLSDAT 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_PSBWMLSDAT INTO WA_PSBWMLSDAT.


*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 ALPHA, internal->external for field AUFNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_PSBWMLSDAT-AUFNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PSBWMLSDAT-AUFNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit NUMCV, internal->external for field VORNR
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_PSBWMLSDAT-VORNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PSBWMLSDAT-VORNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ABPSN, internal->external for field PSPID
CALL FUNCTION 'CONVERSION_EXIT_ABPSN_OUTPUT'
  EXPORTING
    input =                      WA_PSBWMLSDAT-PSPID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PSBWMLSDAT-PSPID.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ABPSN, internal->external for field POSID
CALL FUNCTION 'CONVERSION_EXIT_ABPSN_OUTPUT'
  EXPORTING
    input =                      WA_PSBWMLSDAT-POSID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PSBWMLSDAT-POSID.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field DUR_UNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_PSBWMLSDAT-DUR_UNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PSBWMLSDAT-DUR_UNIT.
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_PSBWMLSDAT_STR, 
MLST_ZAEHL TYPE STRING,
AUFNR TYPE STRING,
VORNR TYPE STRING,
PSPID TYPE STRING,
POSID TYPE STRING,
DATEV TYPE STRING,
DATEH TYPE STRING,
CALDAY TYPE STRING,
VSDATE TYPE STRING,
VALUETYPE TYPE STRING,
EVENT TYPE STRING,
SOURCE TYPE STRING,
DATS TYPE STRING,
TIMS TYPE STRING,
DZONE TYPE STRING,
DURATION TYPE STRING,
DUR_UNIT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PSBWMLSDAT_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_PSBWMLSDAT_STR-MLST_ZAEHL sy-vline 
WA_PSBWMLSDAT_STR-AUFNR sy-vline 
WA_PSBWMLSDAT_STR-VORNR sy-vline 
WA_PSBWMLSDAT_STR-PSPID sy-vline 
WA_PSBWMLSDAT_STR-POSID sy-vline 
WA_PSBWMLSDAT_STR-DATEV sy-vline 
WA_PSBWMLSDAT_STR-DATEH sy-vline 
WA_PSBWMLSDAT_STR-CALDAY sy-vline 
WA_PSBWMLSDAT_STR-VSDATE sy-vline 
WA_PSBWMLSDAT_STR-VALUETYPE sy-vline 
WA_PSBWMLSDAT_STR-EVENT sy-vline 
WA_PSBWMLSDAT_STR-SOURCE sy-vline 
WA_PSBWMLSDAT_STR-DATS sy-vline 
WA_PSBWMLSDAT_STR-TIMS sy-vline 
WA_PSBWMLSDAT_STR-DZONE sy-vline 
WA_PSBWMLSDAT_STR-DURATION sy-vline 
WA_PSBWMLSDAT_STR-DUR_UNIT sy-vline      INTO ld_text SEPARATED BY SPACE.

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