ABAP Select data from SAP table /SCWM/PS_LEVL into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP /SCWM/PS_LEVL 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 /SCWM/PS_LEVL. 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 /SCWM/PS_LEVL 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_/SCWM/PS_LEVL TYPE STANDARD TABLE OF /SCWM/PS_LEVL,
      WA_/SCWM/PS_LEVL TYPE /SCWM/PS_LEVL,
      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: </SCWM/PS_LEVL> TYPE /SCWM/PS_LEVL.

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

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM /SCWM/PS_LEVL
  INTO TABLE IT_/SCWM/PS_LEVL.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /SCWM/PS_LEVL
*  INTO TABLE @DATA(IT_/SCWM/PS_LEVL2).
*--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_/SCWM/PS_LEVL INDEX 1 INTO DATA(WA_/SCWM/PS_LEVL2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_/SCWM/PS_LEVL ASSIGNING </SCWM/PS_LEVL>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
</SCWM/PS_LEVL>-MANDT = 1.
</SCWM/PS_LEVL>-GUID_PS = 1.
</SCWM/PS_LEVL>-LEVEL_SEQ = 1.
</SCWM/PS_LEVL>-GUID_LEVELEM = 1.
</SCWM/PS_LEVL>-TRGQTY = 1.

ENDLOOP.

LOOP AT IT_/SCWM/PS_LEVL INTO WA_/SCWM/PS_LEVL.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/SCWM/PS_LEVL-MINQTY, sy-vline,
  WA_/SCWM/PS_LEVL-RNDQTY, sy-vline,
  WA_/SCWM/PS_LEVL-UNIT_GW, sy-vline,
  WA_/SCWM/PS_LEVL-T_WEIGHT, sy-vline,
  WA_/SCWM/PS_LEVL-UNIT_TW, sy-vline,
  WA_/SCWM/PS_LEVL-UNIT_GV, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/SCWM/PS_LEVL 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_/SCWM/PS_LEVL 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_/SCWM/PS_LEVL INTO WA_/SCWM/PS_LEVL.


*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 PSID, internal->external for field GUID_PS
CALL FUNCTION 'CONVERSION_EXIT_PSID_OUTPUT'
  EXPORTING
    input =                      WA_/SCWM/PS_LEVL-GUID_PS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/SCWM/PS_LEVL-GUID_PS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field LEVEL_SEQ
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/SCWM/PS_LEVL-LEVEL_SEQ
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/SCWM/PS_LEVL-LEVEL_SEQ.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field UNIT_GW
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_/SCWM/PS_LEVL-UNIT_GW
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/SCWM/PS_LEVL-UNIT_GW.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field UNIT_TW
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_/SCWM/PS_LEVL-UNIT_TW
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/SCWM/PS_LEVL-UNIT_TW.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field UNIT_GV
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_/SCWM/PS_LEVL-UNIT_GV
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/SCWM/PS_LEVL-UNIT_GV.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field UNIT_TV
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_/SCWM/PS_LEVL-UNIT_TV
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/SCWM/PS_LEVL-UNIT_TV.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field UNIT_LWH
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_/SCWM/PS_LEVL-UNIT_LWH
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/SCWM/PS_LEVL-UNIT_LWH.
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_/SCWM/PS_LEVL_STR, 
MANDT TYPE STRING,
GUID_PS TYPE STRING,
LEVEL_SEQ TYPE STRING,
GUID_LEVELEM TYPE STRING,
TRGQTY TYPE STRING,
MINQTY TYPE STRING,
RNDQTY TYPE STRING,
UNIT_GW TYPE STRING,
T_WEIGHT TYPE STRING,
UNIT_TW TYPE STRING,
UNIT_GV TYPE STRING,
T_VOLUME TYPE STRING,
UNIT_TV TYPE STRING,
T_CAPA TYPE STRING,
LENGTH TYPE STRING,
WIDTH TYPE STRING,
HEIGHT TYPE STRING,
UNIT_LWH TYPE STRING,
MAX_WEIGHT TYPE STRING,
TOLW TYPE STRING,
TARE_VAR TYPE STRING,
MAX_VOLUME TYPE STRING,
TOLV TYPE STRING,
CLOSED_PACKAGE TYPE STRING,
MAX_CAPA TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/SCWM/PS_LEVL_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_/SCWM/PS_LEVL_STR-MANDT sy-vline 
WA_/SCWM/PS_LEVL_STR-GUID_PS sy-vline 
WA_/SCWM/PS_LEVL_STR-LEVEL_SEQ sy-vline 
WA_/SCWM/PS_LEVL_STR-GUID_LEVELEM sy-vline 
WA_/SCWM/PS_LEVL_STR-TRGQTY sy-vline 
WA_/SCWM/PS_LEVL_STR-MINQTY sy-vline 
WA_/SCWM/PS_LEVL_STR-RNDQTY sy-vline 
WA_/SCWM/PS_LEVL_STR-UNIT_GW sy-vline 
WA_/SCWM/PS_LEVL_STR-T_WEIGHT sy-vline 
WA_/SCWM/PS_LEVL_STR-UNIT_TW sy-vline 
WA_/SCWM/PS_LEVL_STR-UNIT_GV sy-vline 
WA_/SCWM/PS_LEVL_STR-T_VOLUME sy-vline 
WA_/SCWM/PS_LEVL_STR-UNIT_TV sy-vline 
WA_/SCWM/PS_LEVL_STR-T_CAPA sy-vline 
WA_/SCWM/PS_LEVL_STR-LENGTH sy-vline 
WA_/SCWM/PS_LEVL_STR-WIDTH sy-vline 
WA_/SCWM/PS_LEVL_STR-HEIGHT sy-vline 
WA_/SCWM/PS_LEVL_STR-UNIT_LWH sy-vline 
WA_/SCWM/PS_LEVL_STR-MAX_WEIGHT sy-vline 
WA_/SCWM/PS_LEVL_STR-TOLW sy-vline 
WA_/SCWM/PS_LEVL_STR-TARE_VAR sy-vline 
WA_/SCWM/PS_LEVL_STR-MAX_VOLUME sy-vline 
WA_/SCWM/PS_LEVL_STR-TOLV sy-vline 
WA_/SCWM/PS_LEVL_STR-CLOSED_PACKAGE sy-vline 
WA_/SCWM/PS_LEVL_STR-MAX_CAPA sy-vline      INTO ld_text SEPARATED BY SPACE.

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