ABAP Select data from SAP table LAW2_S_SYSTEM_DATA_WO_ADMIN into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP LAW2_S_SYSTEM_DATA_WO_ADMIN 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 LAW2_S_SYSTEM_DATA_WO_ADMIN. 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 LAW2_S_SYSTEM_DATA_WO_ADMIN 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_LAW2_S_SYSTEM_DATA_WO_ADMIN TYPE STANDARD TABLE OF LAW2_S_SYSTEM_DATA_WO_ADMIN,
      WA_LAW2_S_SYSTEM_DATA_WO_ADMIN TYPE LAW2_S_SYSTEM_DATA_WO_ADMIN,
      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: <LAW2_S_SYSTEM_DATA_WO_ADMIN> TYPE LAW2_S_SYSTEM_DATA_WO_ADMIN.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_LAW2_S_SYSTEM_DATA_WO_ADMIN.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM LAW2_S_SYSTEM_DATA_WO_ADMIN
  INTO TABLE IT_LAW2_S_SYSTEM_DATA_WO_ADMIN.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM LAW2_S_SYSTEM_DATA_WO_ADMIN
*  INTO TABLE @DATA(IT_LAW2_S_SYSTEM_DATA_WO_ADMIN2).
*--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_LAW2_S_SYSTEM_DATA_WO_ADMIN INDEX 1 INTO DATA(WA_LAW2_S_SYSTEM_DATA_WO_ADMIN2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_LAW2_S_SYSTEM_DATA_WO_ADMIN ASSIGNING <LAW2_S_SYSTEM_DATA_WO_ADMIN>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<LAW2_S_SYSTEM_DATA_WO_ADMIN>-SYSTEMNO = 1.
<LAW2_S_SYSTEM_DATA_WO_ADMIN>-CUSTNO = 1.
<LAW2_S_SYSTEM_DATA_WO_ADMIN>-SYSID = 1.
<LAW2_S_SYSTEM_DATA_WO_ADMIN>-INSTNO = 1.
<LAW2_S_SYSTEM_DATA_WO_ADMIN>-UISYSTEMID = 1.

ENDLOOP.

LOOP AT IT_LAW2_S_SYSTEM_DATA_WO_ADMIN INTO WA_LAW2_S_SYSTEM_DATA_WO_ADMIN.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_LAW2_S_SYSTEM_DATA_WO_ADMIN-DESCRIPTION, sy-vline,
  WA_LAW2_S_SYSTEM_DATA_WO_ADMIN-LANGUAGE, sy-vline,
  WA_LAW2_S_SYSTEM_DATA_WO_ADMIN-USEDDATABASE, sy-vline,
  WA_LAW2_S_SYSTEM_DATA_WO_ADMIN-SAPRELEASE, sy-vline,
  WA_LAW2_S_SYSTEM_DATA_WO_ADMIN-SYSSTATUS, sy-vline,
  WA_LAW2_S_SYSTEM_DATA_WO_ADMIN-SYSTEMPROD, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_LAW2_S_SYSTEM_DATA_WO_ADMIN 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_LAW2_S_SYSTEM_DATA_WO_ADMIN 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_LAW2_S_SYSTEM_DATA_WO_ADMIN INTO WA_LAW2_S_SYSTEM_DATA_WO_ADMIN.


*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 UISYSTEMID
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_LAW2_S_SYSTEM_DATA_WO_ADMIN-UISYSTEMID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LAW2_S_SYSTEM_DATA_WO_ADMIN-UISYSTEMID.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ISOLA, internal->external for field LANGUAGE
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_LAW2_S_SYSTEM_DATA_WO_ADMIN-LANGUAGE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LAW2_S_SYSTEM_DATA_WO_ADMIN-LANGUAGE.
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_LAW2_S_SYSTEM_DATA_WO_ADMIN_STR, 
SYSTEMNO TYPE STRING,
CUSTNO TYPE STRING,
SYSID TYPE STRING,
INSTNO TYPE STRING,
UISYSTEMID TYPE STRING,
DESCRIPTION TYPE STRING,
LANGUAGE TYPE STRING,
USEDDATABASE TYPE STRING,
SAPRELEASE TYPE STRING,
SYSSTATUS TYPE STRING,
SYSTEMPROD TYPE STRING,
SYSTEMPVERS TYPE STRING,
RFCDESTINATION TYPE STRING,
RSLAWPLUGIN TYPE STRING,
SYSTEMCDATE TYPE STRING,
MEASURESTATUS TYPE STRING,
NOMEASUREREASON TYPE STRING,
NOMEASUREREMARK TYPE STRING,
CONTRACTNUMBER TYPE STRING,
INSTLOCATION TYPE STRING,
INSTCONTACT TYPE STRING,
LOCALSYSTEM TYPE STRING,
EXTSYSTEMFLAG TYPE STRING,
EXTSYSTEMID TYPE STRING,END OF T_EKKO_STR.
DATA: WA_LAW2_S_SYSTEM_DATA_WO_ADMIN_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_LAW2_S_SYSTEM_DATA_WO_ADMIN_STR-SYSTEMNO sy-vline 
WA_LAW2_S_SYSTEM_DATA_WO_ADMIN_STR-CUSTNO sy-vline 
WA_LAW2_S_SYSTEM_DATA_WO_ADMIN_STR-SYSID sy-vline 
WA_LAW2_S_SYSTEM_DATA_WO_ADMIN_STR-INSTNO sy-vline 
WA_LAW2_S_SYSTEM_DATA_WO_ADMIN_STR-UISYSTEMID sy-vline 
WA_LAW2_S_SYSTEM_DATA_WO_ADMIN_STR-DESCRIPTION sy-vline 
WA_LAW2_S_SYSTEM_DATA_WO_ADMIN_STR-LANGUAGE sy-vline 
WA_LAW2_S_SYSTEM_DATA_WO_ADMIN_STR-USEDDATABASE sy-vline 
WA_LAW2_S_SYSTEM_DATA_WO_ADMIN_STR-SAPRELEASE sy-vline 
WA_LAW2_S_SYSTEM_DATA_WO_ADMIN_STR-SYSSTATUS sy-vline 
WA_LAW2_S_SYSTEM_DATA_WO_ADMIN_STR-SYSTEMPROD sy-vline 
WA_LAW2_S_SYSTEM_DATA_WO_ADMIN_STR-SYSTEMPVERS sy-vline 
WA_LAW2_S_SYSTEM_DATA_WO_ADMIN_STR-RFCDESTINATION sy-vline 
WA_LAW2_S_SYSTEM_DATA_WO_ADMIN_STR-RSLAWPLUGIN sy-vline 
WA_LAW2_S_SYSTEM_DATA_WO_ADMIN_STR-SYSTEMCDATE sy-vline 
WA_LAW2_S_SYSTEM_DATA_WO_ADMIN_STR-MEASURESTATUS sy-vline 
WA_LAW2_S_SYSTEM_DATA_WO_ADMIN_STR-NOMEASUREREASON sy-vline 
WA_LAW2_S_SYSTEM_DATA_WO_ADMIN_STR-NOMEASUREREMARK sy-vline 
WA_LAW2_S_SYSTEM_DATA_WO_ADMIN_STR-CONTRACTNUMBER sy-vline 
WA_LAW2_S_SYSTEM_DATA_WO_ADMIN_STR-INSTLOCATION sy-vline 
WA_LAW2_S_SYSTEM_DATA_WO_ADMIN_STR-INSTCONTACT sy-vline 
WA_LAW2_S_SYSTEM_DATA_WO_ADMIN_STR-LOCALSYSTEM sy-vline 
WA_LAW2_S_SYSTEM_DATA_WO_ADMIN_STR-EXTSYSTEMFLAG sy-vline 
WA_LAW2_S_SYSTEM_DATA_WO_ADMIN_STR-EXTSYSTEMID sy-vline      INTO ld_text SEPARATED BY SPACE.

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