ABAP Select data from SAP table EHPMAD_SVT_LGSYS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM EHPMAD_SVT_LGSYS
*  INTO TABLE @DATA(IT_EHPMAD_SVT_LGSYS2).
*--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_EHPMAD_SVT_LGSYS INDEX 1 INTO DATA(WA_EHPMAD_SVT_LGSYS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<EHPMAD_SVT_LGSYS>-CLIENT = 1.
<EHPMAD_SVT_LGSYS>-SVTLOGICALSYSTEMUUID = 1.
<EHPMAD_SVT_LGSYS>-SVTLOGICALSYSTEM = 1.
<EHPMAD_SVT_LGSYS>-LASTCHANGEDATETIME = 1.
<EHPMAD_SVT_LGSYS>-SVTINACTIVE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_EHPMAD_SVT_LGSYS-SVTISINTEGRATED, sy-vline,
  WA_EHPMAD_SVT_LGSYS-SVTINITIALDATE, sy-vline,
  WA_EHPMAD_SVT_LGSYS-SVTLASTDATE, sy-vline,
  WA_EHPMAD_SVT_LGSYS-SVTEXTENDDATE, sy-vline,
  WA_EHPMAD_SVT_LGSYS-SVTMIGRATIONDATE, sy-vline,
  WA_EHPMAD_SVT_LGSYS-LOGHANDLE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_EHPMAD_SVT_LGSYS 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_EHPMAD_SVT_LGSYS 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_EHPMAD_SVT_LGSYS INTO WA_EHPMAD_SVT_LGSYS.


*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 SVTLOGICALSYSTEM
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_EHPMAD_SVT_LGSYS-SVTLOGICALSYSTEM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_EHPMAD_SVT_LGSYS-SVTLOGICALSYSTEM.
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_EHPMAD_SVT_LGSYS_STR, 
CLIENT TYPE STRING,
SVTLOGICALSYSTEMUUID TYPE STRING,
SVTLOGICALSYSTEM TYPE STRING,
LASTCHANGEDATETIME TYPE STRING,
SVTINACTIVE TYPE STRING,
SVTISINTEGRATED TYPE STRING,
SVTINITIALDATE TYPE STRING,
SVTLASTDATE TYPE STRING,
SVTEXTENDDATE TYPE STRING,
SVTMIGRATIONDATE TYPE STRING,
LOGHANDLE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_EHPMAD_SVT_LGSYS_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_EHPMAD_SVT_LGSYS_STR-CLIENT sy-vline 
WA_EHPMAD_SVT_LGSYS_STR-SVTLOGICALSYSTEMUUID sy-vline 
WA_EHPMAD_SVT_LGSYS_STR-SVTLOGICALSYSTEM sy-vline 
WA_EHPMAD_SVT_LGSYS_STR-LASTCHANGEDATETIME sy-vline 
WA_EHPMAD_SVT_LGSYS_STR-SVTINACTIVE sy-vline 
WA_EHPMAD_SVT_LGSYS_STR-SVTISINTEGRATED sy-vline 
WA_EHPMAD_SVT_LGSYS_STR-SVTINITIALDATE sy-vline 
WA_EHPMAD_SVT_LGSYS_STR-SVTLASTDATE sy-vline 
WA_EHPMAD_SVT_LGSYS_STR-SVTEXTENDDATE sy-vline 
WA_EHPMAD_SVT_LGSYS_STR-SVTMIGRATIONDATE sy-vline 
WA_EHPMAD_SVT_LGSYS_STR-LOGHANDLE sy-vline      INTO ld_text SEPARATED BY SPACE.

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