ABAP Select data from SAP table LISLOGSYS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM LISLOGSYS
*  INTO TABLE @DATA(IT_LISLOGSYS2).
*--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_LISLOGSYS INDEX 1 INTO DATA(WA_LISLOGSYS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<LISLOGSYS>-DOMNAM = 1.
<LISLOGSYS>-SYSNAM = 1.
<LISLOGSYS>-STATE = 1.
<LISLOGSYS>-SAPCLIENT = 1.
<LISLOGSYS>-SAPCLITXT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_LISLOGSYS-ALESYSNAM, sy-vline,
  WA_LISLOGSYS-SYSROLE, sy-vline,
  WA_LISLOGSYS-CCCATEGORY, sy-vline,
  WA_LISLOGSYS-CCCORACTIV, sy-vline,
  WA_LISLOGSYS-CCNOCLIIND, sy-vline,
  WA_LISLOGSYS-CCCOPYLOCK, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_LISLOGSYS 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_LISLOGSYS 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_LISLOGSYS INTO WA_LISLOGSYS.


*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 ALESYSNAM
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_LISLOGSYS-ALESYSNAM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LISLOGSYS-ALESYSNAM.
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_LISLOGSYS_STR, 
DOMNAM TYPE STRING,
SYSNAM TYPE STRING,
STATE TYPE STRING,
SAPCLIENT TYPE STRING,
SAPCLITXT TYPE STRING,
ALESYSNAM TYPE STRING,
SYSROLE TYPE STRING,
CCCATEGORY TYPE STRING,
CCCORACTIV TYPE STRING,
CCNOCLIIND TYPE STRING,
CCCOPYLOCK TYPE STRING,
CCIMAILDIS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_LISLOGSYS_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_LISLOGSYS_STR-DOMNAM sy-vline 
WA_LISLOGSYS_STR-SYSNAM sy-vline 
WA_LISLOGSYS_STR-STATE sy-vline 
WA_LISLOGSYS_STR-SAPCLIENT sy-vline 
WA_LISLOGSYS_STR-SAPCLITXT sy-vline 
WA_LISLOGSYS_STR-ALESYSNAM sy-vline 
WA_LISLOGSYS_STR-SYSROLE sy-vline 
WA_LISLOGSYS_STR-CCCATEGORY sy-vline 
WA_LISLOGSYS_STR-CCCORACTIV sy-vline 
WA_LISLOGSYS_STR-CCNOCLIIND sy-vline 
WA_LISLOGSYS_STR-CCCOPYLOCK sy-vline 
WA_LISLOGSYS_STR-CCIMAILDIS sy-vline      INTO ld_text SEPARATED BY SPACE.

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