ABAP Select data from SAP table LAW2D_USMM_PERS into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP LAW2D_USMM_PERS 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 LAW2D_USMM_PERS. 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 LAW2D_USMM_PERS 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_LAW2D_USMM_PERS TYPE STANDARD TABLE OF LAW2D_USMM_PERS,
      WA_LAW2D_USMM_PERS TYPE LAW2D_USMM_PERS,
      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: <LAW2D_USMM_PERS> TYPE LAW2D_USMM_PERS.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_LAW2D_USMM_PERS.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM LAW2D_USMM_PERS
  INTO TABLE IT_LAW2D_USMM_PERS.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM LAW2D_USMM_PERS
*  INTO TABLE @DATA(IT_LAW2D_USMM_PERS2).
*--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_LAW2D_USMM_PERS INDEX 1 INTO DATA(WA_LAW2D_USMM_PERS2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_LAW2D_USMM_PERS ASSIGNING <LAW2D_USMM_PERS>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<LAW2D_USMM_PERS>-MANDT = 1.
<LAW2D_USMM_PERS>-DATASETGUID = 1.
<LAW2D_USMM_PERS>-SYSTEMGUID = 1.
<LAW2D_USMM_PERS>-PARTID = 1.
<LAW2D_USMM_PERS>-UNAME = 1.

ENDLOOP.

LOOP AT IT_LAW2D_USMM_PERS INTO WA_LAW2D_USMM_PERS.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_LAW2D_USMM_PERS-CMANDT, sy-vline,
  WA_LAW2D_USMM_PERS-SYSID, sy-vline,
  WA_LAW2D_USMM_PERS-CREATIONDATE, sy-vline,
  WA_LAW2D_USMM_PERS-LASTLOGIN, sy-vline,
  WA_LAW2D_USMM_PERS-FIRSTNAME, sy-vline,
  WA_LAW2D_USMM_PERS-LASTNAME, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_LAW2D_USMM_PERS 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_LAW2D_USMM_PERS 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_LAW2D_USMM_PERS INTO WA_LAW2D_USMM_PERS.


*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 SXIDN, internal->external for field EMAILADDR
CALL FUNCTION 'CONVERSION_EXIT_SXIDN_OUTPUT'
  EXPORTING
    input =                      WA_LAW2D_USMM_PERS-EMAILADDR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LAW2D_USMM_PERS-EMAILADDR.
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_LAW2D_USMM_PERS_STR, 
MANDT TYPE STRING,
DATASETGUID TYPE STRING,
SYSTEMGUID TYPE STRING,
PARTID TYPE STRING,
UNAME TYPE STRING,
CMANDT TYPE STRING,
SYSID TYPE STRING,
CREATIONDATE TYPE STRING,
LASTLOGIN TYPE STRING,
FIRSTNAME TYPE STRING,
LASTNAME TYPE STRING,
PHONENUMBER TYPE STRING,
EMAILADDR TYPE STRING,
ACCOUNTID TYPE STRING,
CLASSTYPE TYPE STRING,
LICENSETYPE TYPE STRING,
VERSURCHARGE TYPE STRING,
SURCHARGE TYPE STRING,
UNIQUELAWGUID TYPE STRING,
EXTERNALID TYPE STRING,
USERTYPECOMBINATION TYPE STRING,
USERTYPECONS TYPE STRING,
CHARGINGSYSID TYPE STRING,
CHARGINGCLIENT TYPE STRING,
CHARGINGUSER TYPE STRING,
KOSTL TYPE STRING,END OF T_EKKO_STR.
DATA: WA_LAW2D_USMM_PERS_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_LAW2D_USMM_PERS_STR-MANDT sy-vline 
WA_LAW2D_USMM_PERS_STR-DATASETGUID sy-vline 
WA_LAW2D_USMM_PERS_STR-SYSTEMGUID sy-vline 
WA_LAW2D_USMM_PERS_STR-PARTID sy-vline 
WA_LAW2D_USMM_PERS_STR-UNAME sy-vline 
WA_LAW2D_USMM_PERS_STR-CMANDT sy-vline 
WA_LAW2D_USMM_PERS_STR-SYSID sy-vline 
WA_LAW2D_USMM_PERS_STR-CREATIONDATE sy-vline 
WA_LAW2D_USMM_PERS_STR-LASTLOGIN sy-vline 
WA_LAW2D_USMM_PERS_STR-FIRSTNAME sy-vline 
WA_LAW2D_USMM_PERS_STR-LASTNAME sy-vline 
WA_LAW2D_USMM_PERS_STR-PHONENUMBER sy-vline 
WA_LAW2D_USMM_PERS_STR-EMAILADDR sy-vline 
WA_LAW2D_USMM_PERS_STR-ACCOUNTID sy-vline 
WA_LAW2D_USMM_PERS_STR-CLASSTYPE sy-vline 
WA_LAW2D_USMM_PERS_STR-LICENSETYPE sy-vline 
WA_LAW2D_USMM_PERS_STR-VERSURCHARGE sy-vline 
WA_LAW2D_USMM_PERS_STR-SURCHARGE sy-vline 
WA_LAW2D_USMM_PERS_STR-UNIQUELAWGUID sy-vline 
WA_LAW2D_USMM_PERS_STR-EXTERNALID sy-vline 
WA_LAW2D_USMM_PERS_STR-USERTYPECOMBINATION sy-vline 
WA_LAW2D_USMM_PERS_STR-USERTYPECONS sy-vline 
WA_LAW2D_USMM_PERS_STR-CHARGINGSYSID sy-vline 
WA_LAW2D_USMM_PERS_STR-CHARGINGCLIENT sy-vline 
WA_LAW2D_USMM_PERS_STR-CHARGINGUSER sy-vline 
WA_LAW2D_USMM_PERS_STR-KOSTL sy-vline      INTO ld_text SEPARATED BY SPACE.

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